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  • Turing Machine & Modern Computer

    - by smwikipedia
    I heard a lot that modern computers are based on Turing machine. I'd like to share my understanding and hear your comments. I think the computer is a big general-purpose Turing machine. Each program we write is a small specific-purpose Turing machine. The classical Turing machine do its job based on the input and its current state inside and so do our programs. Let's take a running program (a process) as an example. We know that in the process's address space, there's areas for stack, heap, and code. A classical Turing machine doesn't have the ability to remember many things, so we borrow the concept of stack from the push-down automaton. The heap and stack areas contains the state of our specific-purpose Turing machine (our program). The code area represents the logic of this small Turing machine. And various I/O devices supply input to this Turing machine. The above is my naive understanding about the working paradigm of modern computer. I couln't wait to hear your comments. Thanks very much.

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  • How to improve this piece of code

    - by user303518
    Can anyone help me on this. It may be very frustrating for you all. But I want you guys to take a moment to look at the code below and please tell me all the things that are wrong in the below piece of code. You can copy it into your visual studio to analyze this better. You don’t have to make this code compile. My task is to get the following things: Most obvious mistakes with this code All the things that are wrong/bad practices with the code below Modify/Write an optimized version of this code. Keep in mind, the code DOES NOT need to compile. Reduce the number of lines of code You should NEVER try to implement something like below: public List<ValidationErrorDto> ProcessEQuote(string eQuoteXml, long programUniversalID) { // Get Program Info. DataTable programs = GetAllPrograms(); DataRow[] programRows = programs.Select(string.Format("ProgramUniversalID = {0}", programUniversalID)); long programID = (long)programRows[0]["ProgramID"]; string programName = (string)programRows[0]["Description"]; // Get Config file values. string fromEmail = ConfigurationManager.AppSettings["eQuotesFromEmail"]; string technicalSupportPhone = ConfigurationManager.AppSettings["TechnicalSupportPhone"]; string fromEmailDisplayName = string.IsNullOrEmpty(ConfigurationManager.AppSettings["eQuotesFromDisplayName"]) ? null : string.Format(ConfigurationManager.AppSettings["eQuotesFromDisplayName"], programName); string itEmail = !string.IsNullOrEmpty(ConfigurationManager.AppSettings["ITEmail"]) ? ConfigurationManager.AppSettings["ITEmail"] : string.Empty; string itName = !string.IsNullOrEmpty(ConfigurationManager.AppSettings["ITName"]) ? ConfigurationManager.AppSettings["ITName"] : "IT"; try { List<ValidationErrorDto> allValidationErrors = new List<ValidationErrorDto>(); List<ValidationErrorDto> validationErrors = new List<ValidationErrorDto>(); if (validationErrors.Count == 0) { validationErrors.AddRange(ValidateEQuoteXmlAgainstSchema(eQuoteXml)); if (validationErrors.Count == 0) { XmlDocument eQuoteXmlDoc = new XmlDocument(); eQuoteXmlDoc.LoadXml(eQuoteXml); XmlElement rootElement = eQuoteXmlDoc.DocumentElement; XmlNodeList quotesList = rootElement.SelectNodes("Quote"); foreach (XmlNode node in quotesList) { // Each node should be a quote node but to be safe, check if (node.Name == "Quote") { string groupName = node.SelectSingleNode("Group/GroupName").InnerText; string groupCity = node.SelectSingleNode("Group/GroupCity").InnerText; string groupPostalCode = node.SelectSingleNode("Group/GroupZipCode").InnerText; string groupSicCode = node.SelectSingleNode("Group/GroupSIC").InnerText; string generalAgencyLicenseNumber = node.SelectSingleNode("Group/GALicenseNbr").InnerText; string brokerName = node.SelectSingleNode("Group/BrokerName").InnerText; string deliverToEmailAddress = node.SelectSingleNode("Group/ReturnEmailAddress").InnerText; string brokerEmail = node.SelectSingleNode("Group/BrokerEmail").InnerText; string groupEligibleEmployeeCountString = node.SelectSingleNode("Group/GroupNbrEmployees").InnerText; string quoteEffectiveDateString = node.SelectSingleNode("Group/QuoteEffectiveDate").InnerText; string salesRepName = node.SelectSingleNode("Group/SalesRepName").InnerText; string salesRepPhone = node.SelectSingleNode("Group/SalesRepPhone").InnerText; string salesRepEmail = node.SelectSingleNode("Group/SalesRepEmail").InnerText; string brokerLicenseNumber = node.SelectSingleNode("Group/BrokerLicenseNbr").InnerText; DateTime? quoteEffectiveDate = null; int eligibleEmployeeCount = int.Parse(groupEligibleEmployeeCountString); DateTime quoteEffectiveDateOut; if (!DateTime.TryParse(quoteEffectiveDateString, out quoteEffectiveDateOut)) validationErrors.Add(ValidationHelper.CreateValidationError((long)QuoteField.EffectiveDate, "Quote Effective Date", ValidationErrorDto.ValueOutOfRange, false, ValidationHelper.CreateValidationContext(Entity.QuoteDetail, "Quote"))); else quoteEffectiveDate = quoteEffectiveDateOut; Dictionary<string, string> replacementCodeValues = new Dictionary<string, string>(); if (string.IsNullOrEmpty(Resources.ParameterMessageKeys.ResourceManager.GetString("GroupName"))) throw new InvalidOperationException("GroupName key is not configured"); replacementCodeValues.Add(Resources.ParameterMessageKeys.GroupName, groupName); replacementCodeValues.Add(Resources.ParameterMessageKeys.ProgramName, programName); replacementCodeValues.Add(Resources.ParameterMessageKeys.SalesRepName, salesRepName); replacementCodeValues.Add(Resources.ParameterMessageKeys.SalesRepPhone, salesRepPhone); replacementCodeValues.Add(Resources.ParameterMessageKeys.SalesRepEmail, salesRepEmail); replacementCodeValues.Add(Resources.ParameterMessageKeys.TechnicalSupportPhone, technicalSupportPhone); replacementCodeValues.Add(Resources.ParameterMessageKeys.EligibleEmployeCount, eligibleEmployeeCount.ToString()); // Retrieve the CityID and StateID long? cityID = null; long? stateID = null; DataSet citiesAndStates = Addresses.GetCitiesAndStatesFromPostalCode(groupPostalCode); DataTable cities = citiesAndStates.Tables[0]; DataTable states = citiesAndStates.Tables[1]; DataRow[] cityRows = cities.Select(string.Format("Name = '{0}'", groupCity)); if (cityRows.Length > 0) { cityID = (long)cityRows[0]["CityID"]; DataRow[] stateRows = states.Select(string.Format("CityID = {0}", cityID)); if (stateRows.Length > 0) stateID = (long)stateRows[0]["StateID"]; } // If the StateID does not exist, then we cannot get the GeneralAgency, so set a validation error and do not contine. // Else, Continue and look for an General Agency. If a GA was found, look for or create a Broker. Then look for or create a Prospect Group // Then using the info, create a quote. if (!stateID.HasValue) validationErrors.Add(ValidationHelper.CreateValidationError((long)ProspectGroupField.State, "Prospect Group State", ValidationErrorDto.RequiredFieldMissing, false, ValidationHelper.CreateValidationContext(Entity.ProspectGroup, "Prospect Group"))); bool brokerValidationError = false; SalesRepDto salesRep = GetSalesRepByEmail(salesRepEmail, ref validationErrors); if (salesRep == null) { string exceptionMessage = "Sales Rep Not found in Opportunity System. Please make sure Sales Rep is present in the system by adding the sales rep in AWP SR Add Screen." + Environment.NewLine; exceptionMessage = exceptionMessage + " Sales Rep Name: " + salesRepName + Environment.NewLine; exceptionMessage = exceptionMessage + " Sales Rep Email: " + salesRepEmail + Environment.NewLine; exceptionMessage = exceptionMessage + " Module : E-Quote Service" + Environment.NewLine; throw new Exception(exceptionMessage); } if (validationErrors.Count == 0) { // Note that StateID and EffectiveDate should be valid at this point. If it weren't there would be validation errors. // Find General Agency long? generalAgencyID; validationErrors.AddRange(GetEQuoteGeneralAgency(generalAgencyLicenseNumber, stateID.Value, out generalAgencyID)); // If GA was found, check for Broker. if (validationErrors.Count == 0 && generalAgencyID.HasValue) { Dictionary<string, string> brokerNameParts = ContactHelper.GetNamePartsFromFullName(brokerName); long? brokerID; validationErrors.AddRange(CreateEQuoteBroker(brokerNameParts["FirstName"], brokerNameParts["LastName"], brokerEmail, brokerLicenseNumber, stateID.Value, generalAgencyID.Value, salesRep, programID, out brokerID)); // If Broker was found but had validation errors if (validationErrors.Count > 0) { DeliverEmailMessage(programID, quoteEffectiveDate.Value, fromEmail, fromEmailDisplayName, itEmail, DocumentType.EQuoteBrokerValidationFailureMessageEmail, replacementCodeValues); brokerValidationError = true; } // If Broker was found, check for Prospect Group if (validationErrors.Count == 0 && brokerID.HasValue) { long? prospectGroupID; validationErrors.AddRange(CreateEQuoteProspectGroup(groupName, cityID, stateID, groupPostalCode, groupSicCode, brokerID.Value, out prospectGroupID)); if (validationErrors.Count == 0 && prospectGroupID.HasValue) { if (validationErrors.Count == 0) { long? quoteID; validationErrors.AddRange(CreateEQuote(programID, prospectGroupID.Value, generalAgencyID.Value, quoteEffectiveDate.Value, eligibleEmployeeCount, deliverToEmailAddress, node.SelectNodes("Employees/Employee"), deliverToEmailAddress, out quoteID)); if (validationErrors.Count == 0 && quoteID.HasValue) { QuoteFromServiceDto quoteFromService = GetQuoteByQuoteID(quoteID.Value); // Generate Pre-Message replacementCodeValues.Add(Resources.ParameterMessageKeys.QuoteNumber, string.Format("{0}.{1}", quoteFromService.QuoteNumber, quoteFromService.QuoteVersion)); replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, brokerName); replacementCodeValues.Add(Resources.ParameterMessageKeys.LicenseNumbers, brokerLicenseNumber); DeliverEmailMessage(programID, quoteEffectiveDate.Value, fromEmail, fromEmailDisplayName, deliverToEmailAddress, DocumentType.EQuotePreMessageEmail, replacementCodeValues); bool quoteGenerated = false; try { quoteGenerated = GenerateAndDeliverInitialQuote(quoteID.Value); } catch (Exception exception) { TraceLogger.LogException(exception, LoggingCategory); if (replacementCodeValues.ContainsKey(Resources.ParameterMessageKeys.Name)) replacementCodeValues[Resources.ParameterMessageKeys.Name] = itName; else replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, itName); if (replacementCodeValues.ContainsKey(Resources.ParameterMessageKeys.Errors)) replacementCodeValues[Resources.ParameterMessageKeys.Errors] = string.Format("Errors:\r\n:{0}", exception); else replacementCodeValues.Add(Resources.ParameterMessageKeys.Errors, string.Format("Errors:\r\n:{0}", exception)); DeliverEmailMessage(programID, quoteEffectiveDate.Value, fromEmail, fromEmailDisplayName, itEmail, DocumentType.EQuoteSystemFailureMessageEmail, replacementCodeValues); } if (!quoteGenerated) { // Generate System Failure Message if (replacementCodeValues.ContainsKey(Resources.ParameterMessageKeys.Name)) replacementCodeValues[Resources.ParameterMessageKeys.Name] = brokerName; else replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, brokerName); if (replacementCodeValues.ContainsKey(Resources.ParameterMessageKeys.Errors)) replacementCodeValues[Resources.ParameterMessageKeys.Errors] = string.Empty; else replacementCodeValues.Add(Resources.ParameterMessageKeys.Errors, string.Empty); DeliverEmailMessage(programID, quoteEffectiveDate.Value, fromEmail, fromEmailDisplayName, itEmail, DocumentType.EQuoteSystemFailureMessageEmail, replacementCodeValues); } } } } } } } //if (validationErrors.Count > 0) // Per spec, if Broker Validation returned an error we already sent an email, don't send another generic one if (validationErrors.Count > 0 && (!brokerValidationError)) { StringBuilder errorString = new StringBuilder(); foreach (ValidationErrorDto validationError in validationErrors) errorString = errorString.AppendLine(string.Format(" - {0}", ValidationHelper.GetValidationErrorReason(validationError, true))); replacementCodeValues.Add(Resources.ParameterMessageKeys.Errors, errorString.ToString()); if (replacementCodeValues.ContainsKey(Resources.ParameterMessageKeys.Name)) replacementCodeValues[Resources.ParameterMessageKeys.Name] = brokerName; else replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, brokerName); // HACK: If there is no effective date, then use Today's date. Do we care about the effecitve dat on validation message? if (quoteEffectiveDate.HasValue) DeliverEmailMessage(programID, quoteEffectiveDate.Value, fromEmail, fromEmailDisplayName, itEmail, DocumentType.EQuoteValidationFailureMessageEmail, replacementCodeValues); else DeliverEmailMessage(programID, DateTime.Now, fromEmail, fromEmailDisplayName, itEmail, DocumentType.EQuoteValidationFailureMessageEmail, replacementCodeValues); } allValidationErrors.AddRange(validationErrors); validationErrors.Clear(); } } } else { // Use todays date as the effective date. Dictionary<string, string> replacementCodeValues = new Dictionary<string, string>(); StringBuilder errorString = new StringBuilder(); foreach (ValidationErrorDto validationError in validationErrors) errorString = errorString.AppendLine(string.Format(" - {0}", ValidationHelper.GetValidationErrorReason(validationError, true))); replacementCodeValues.Add(Resources.ParameterMessageKeys.Errors, string.Format("The following validation errors occurred: \r\n{0}", errorString)); replacementCodeValues.Add(Resources.ParameterMessageKeys.ProgramName, programName); replacementCodeValues.Add(Resources.ParameterMessageKeys.GroupName, "Group"); replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, itName); DeliverEmailMessage(programID, DateTime.Now, fromEmail, null, itEmail, DocumentType.EQuoteSystemFailureMessageEmail, replacementCodeValues); allValidationErrors.AddRange(validationErrors); validationErrors.Clear(); } } return allValidationErrors; } catch (Exception exception) { TraceLogger.LogException(exception, LoggingCategory); // Use todays date as the effective date. Dictionary<string, string> replacementCodeValues = new Dictionary<string, string>(); replacementCodeValues.Add(Resources.ParameterMessageKeys.ProgramName, programName); replacementCodeValues.Add(Resources.ParameterMessageKeys.GroupName, "Group"); replacementCodeValues.Add(Resources.ParameterMessageKeys.Name, itName); replacementCodeValues.Add(Resources.ParameterMessageKeys.Errors, string.Format("Errors:\r\n:{0}", exception)); DeliverEmailMessage(programID, DateTime.Now, fromEmail, null, itEmail, DocumentType.EQuoteSystemFailureMessageEmail, replacementCodeValues); throw new FaultException(exception.ToString()); } }

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  • Corrupt mercurial repository - cannot update

    - by richzilla
    Hi all, i think ive managed to corrupt one of mercurial repositories, is there anyway to recover the damage? the message i get when attempting to update the repo to my default branch is: PS C:\wco\projects\ims\code> hg up -C default abort: data/Trunk/application/models/priority_model.php.i@83dbdfb60981: no match found! when i run hg verify, i get the following report: PS C:\wco\projects\ims\code> hg verify checking changesets checking manifests crosschecking files in changesets and manifests checking files data/.buildpath.i@0: missing revlog! 0: empty or missing .buildpath .buildpath@0: daf15acb5273 in manifests not found data/.project.i@0: missing revlog! 0: empty or missing .project .project@0: e8b25997d6d1 in manifests not found Rawlings IMS/index.html@3: empty or missing copy source revlog index.html:b8b2b36a6eea Rawlings IMS/index.php@3: empty or missing copy source revlog index.php:a5f76bf232e9 Rawlings IMS/index_backup.php@3: empty or missing copy source revlog index_backup.php:a5f76bf232e9 Rawlings IMS/index_this_hold.html@3: empty or missing copy source revlog index_this_hold.html:b8b2b36a6eea Rawlings IMS/testera.php@3: empty or missing copy source revlog testera.php:6e9e3666c1bc Trunk/application/models/priority_model.php@32: 83dbdfb60981 in manifests not found data/index.html.i@0: missing revlog! 0: empty or missing index.html index.html@0: b8b2b36a6eea in manifests not found data/index.php.i@0: missing revlog! 0: empty or missing index.php index.php@0: a5f76bf232e9 in manifests not found data/index_backup.php.i@0: missing revlog! 0: empty or missing index_backup.php index_backup.php@0: a5f76bf232e9 in manifests not found data/index_this_hold.html.i@0: missing revlog! 0: empty or missing index_this_hold.html index_this_hold.html@0: b8b2b36a6eea in manifests not found data/nbproject/project.properties.i@14: missing revlog! 14: empty or missing nbproject/project.properties nbproject/project.properties@14: 1efa3074378b in manifests not found data/nbproject/project.xml.i@14: missing revlog! 14: empty or missing nbproject/project.xml nbproject/project.xml@14: 52689bf2b35a in manifests not found data/rcrawley/.buildpath.i@9: missing revlog! 9: empty or missing rcrawley/.buildpath rcrawley/.buildpath@9: 2c6411d4fcff in manifests not found data/rcrawley/.project.i@9: missing revlog! 9: empty or missing rcrawley/.project rcrawley/.project@9: cb4b1495acab in manifests not found data/rcrawley/assets/images/ajax-loader.gif.i@9: missing revlog! 9: empty or missing rcrawley/assets/images/ajax-loader.gif rcrawley/assets/images/ajax-loader.gif@9: 8ef26516c7da in manifests not found data/rcrawley/index.html.i@9: missing revlog! 9: empty or missing rcrawley/index.html rcrawley/index.html@9: 545246299dee in manifests not found data/rcrawley/index.php.i@9: missing revlog! 9: empty or missing rcrawley/index.php rcrawley/index.php@9: 66eac798ed6d in manifests not found data/rcrawley/index_backup.php.i@9: missing revlog! 9: empty or missing rcrawley/index_backup.php rcrawley/index_backup.php@9: 93971228fbf5 in manifests not found data/rcrawley/system/index.html.i@9: missing revlog! 9: empty or missing rcrawley/system/index.html rcrawley/system/index.html@9: 17360d3b566e in manifests not found data/rcrawley/testera.php.i@9: missing revlog! 9: empty or missing rcrawley/testera.php rcrawley/testera.php@9: 7d9bd5196740 in manifests not found data/testera.php.i@0: missing revlog! 0: empty or missing testera.php testera.php@0: 6e9e3666c1bc in manifests not found 1646 files, 59 changesets, 1897 total revisions 57 integrity errors encountered! (first damaged changeset appears to be 0) since the first damaged changeset is 0, this would appear to be pretty terminal. Is there anyway around this? any help would be appreciated.

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  • .NET out of memory troubleshooting

    - by bushman
    After reading a few enlightening articles about memory in the .NET technology, Out of Memory does not refer to physical memory, 597499. I thought I understood why a C# app would throw an out of memory exception -- until I started experimenting with two servers-- both are having 2.5 gigs of ram, windows server 2003 and identical programs running. The only significant difference between the two being one has 7% hard drive storage left and the other more than 50%. The server with 7% storage space left is consistently throwing an out of memory while the other is performing consistently well. My app is a C# web application that process' hundreds of MBs of String object. Why would this difference happen seeing that the most likely reason for the out of memory issue is out of contiguous virtual address space -- What solutions do you guys propose -- and what do you say about the following 1. turn on the 3gb switch to increase the virtual address space -- 2. instead of using one giant string object, break it up into smaller pieces and collect it in a jagged array (here I have to find a way to return to the caller in some other way as right now, the return type is a string) thanks SO

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  • F#, Linux and makefiles

    - by rwallace
    I intend to distribute an F# program as both binary and source so the user has the option of recompiling it if desired. On Windows, I understand how to do this: provide .fsproj and .sln files, which both Visual Studio and MSBuild can understand. On Linux, the traditional solution for C programs is a makefile. This depends on gcc being directly available, which it always is. The F# compiler can be installed on Linux and works under Mono, so that's fine so far. However, as far as I can tell, it doesn't create a scenario where fsc runs the compiler, instead the command is mono ...path.../fsc.exe. This is also fine, except I don't know what the path is going to be. So the full command to run the compiler in my case could be mono ~/FSharp-2.0.0.0/bin/fsc.exe types.fs tptp.fs main.fs -r FSharp.PowerPack.dll except that I'm not sure where fsc.exe will actually be located on the user's machine. Is there a way to find that out within a makefile, or would it be better to fall back on just explaining the above in the documentation and relying on the user to modify the command according to his setup?

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  • Which Java library for Binary Decision Diagrams?

    - by reprogrammer
    A Binary Decision Diagram (BDD) is a data structure to represent boolean functions. I'd like use this data structure in a Java program. My search for Java based BDD libraries resulted into the following packages. Java Decision Diagram Libraries JavaBDD JDD If you know of any other BDD libraries available for Java programs, please let me know so that I add it to the list above. If you have used any of these libraries, please tell me about your experience with the library. In particular, I'd like you to compare the available libraries along the following dimensions. Quality. Is the library mature and reasonably bug free? Performance. How do you evaluate the performance of the library? Support. Could you easily get support whenever you encountered a problem with the library? Was the library well documented? Ease of use. Was the API well designed? Could you install and use the library quickly and easily? Please mention the version of the library that you are evaluating.

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  • Reading a large file into Perl array of arrays and manipulating the output for different purposes

    - by Brian D.
    Hello, I am relatively new to Perl and have only used it for converting small files into different formats and feeding data between programs. Now, I need to step it up a little. I have a file of DNA data that is 5,905 lines long, with 32 fields per line. The fields are not delimited by anything and vary in length within the line, but each field is the same size on all 5905 lines. I need each line fed into a separate array from the file, and each field within the line stored as its own variable. I am having no problems storing one line, but I am having difficulties storing each line successively through the entire file. This is how I separate the first line of the full array into individual variables: my $SampleID = substr("@HorseArray", 0, 7); my $PopulationID = substr("@HorseArray", 9, 4); my $Allele1A = substr("@HorseArray", 14, 3); my $Allele1B = substr("@HorseArray", 17, 3); my $Allele2A = substr("@HorseArray", 21, 3); my $Allele2B = substr("@HorseArray", 24, 3); ...etc. My issues are: 1) I need to store each of the 5905 lines as a separate array. 2) I need to be able to reference each line based on the sample ID, or a group of lines based on population ID and sort them. I can sort and manipulate the data fine once it is defined in variables, I am just having trouble constructing a multidimensional array with each of these fields so I can reference each line at will. Any help or direction is much appreciated. I've poured over the Q&A sections on here, but have not found the answer to my questions yet. Thanks!! -Brian

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  • populate a tree view with an xml file

    - by syedsaleemss
    Im using .net windows form application. I have an xml file.I want to populate a tree view with data from a xml file. I am doing this using the following code. private void button1_Click(object sender, EventArgs e) { try { this.Cursor = System.Windows.Forms.Cursors.WaitCursor; //string strXPath = "languages"; string strRootNode = "Treeview Sample"; OpenFileDialog Dlg = new OpenFileDialog(); Dlg.Filter = "All files(*.*)|*.*|xml file (*.xml)|*.txt"; Dlg.CheckFileExists = true; string xmlfilename = ""; if (Dlg.ShowDialog() == DialogResult.OK) { xmlfilename = Dlg.FileName; } // Load the XML file. //XmlDocument dom = new XmlDocument(); //dom.Load(xmlfilename); XmlDocument doc = new XmlDocument(); doc.Load(xmlfilename); string rootName = doc.SelectSingleNode("/*").Name; textBox4.Text = rootName.ToString(); //XmlNode root = dom.LastChild; //textBox4.Text = root.Name.ToString(); // Load the XML into the TreeView. this.treeView1.Nodes.Clear(); this.treeView1.Nodes.Add(new TreeNode(strRootNode)); TreeNode tNode = new TreeNode(); tNode = this.treeView1.Nodes[0]; XmlNodeList oNodes = doc.SelectNodes(textBox4.Text); XmlNode xNode = oNodes.Item(0).ParentNode; AddNode(ref xNode, ref tNode); this.treeView1.CollapseAll(); this.treeView1.Nodes[0].Expand(); this.Cursor = System.Windows.Forms.Cursors.Default; } catch (Exception ex) { this.Cursor = System.Windows.Forms.Cursors.Default; MessageBox.Show(ex.Message, "Error"); } } private void AddNode(ref XmlNode inXmlNode, ref TreeNode inTreeNode) { // Recursive routine to walk the XML DOM and add its nodes to a TreeView. XmlNode xNode; TreeNode tNode; XmlNodeList nodeList; int i; // Loop through the XML nodes until the leaf is reached. // Add the nodes to the TreeView during the looping process. if (inXmlNode.HasChildNodes) { nodeList = inXmlNode.ChildNodes; for (i = 0; i <= nodeList.Count - 1; i++) { xNode = inXmlNode.ChildNodes[i]; inTreeNode.Nodes.Add(new TreeNode(xNode.Name)); tNode = inTreeNode.Nodes[i]; AddNode(ref xNode, ref tNode); } } else { inTreeNode.Text = inXmlNode.OuterXml.Trim(); } } My xml file is this:"hello.xml" - - abc hello how ru - def i m fine - ghi how abt u Now after using the above code I am able to populate the tree view. But I dont like to populate the complete xml file. I should get only till languages language key value I don't want abc how are you etc..... I mean to say the leaf nodes. Please help me

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  • Ways to gain a deeper understanding of programming concepts?

    - by MrPlow
    I'm a marketer and have been messing around in PHP/MySQL for years. Recently (the last several months) I've been making my own scripts/programs in Python and I've really enjoyed the whole problem solving process. I've read(skimmed) some books and understand the basics of OOP, polymorphism, etc.. I have a general interest in AI and Natural Language in particular but it seems these things require a masters in Computer Science. My knowledge of math is poor. The last class I took was calculus, and I've forgotten the majority of it. Basically I'm looking for things to learn that will help me think in a more analytic way, and maybe see solutions where I didn't before. Improving my ability to program in Python would be nice too. I don't need to learn a specific language or something for employment, just enjoyment. Although my work often involves web development so some utility would be nice. I don't like learning concepts by just reading them. I need to apply them, even if the examples are contrived. A recommendation of a couple good books or other resources would be nice. :) Apologies if this is too vague/misplaced...

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  • Best intro to C++ static metaprogramming?

    - by jwfearn
    Static metaprogramming (aka "template metaprogramming") is a great C++ technique that allows the execution of programs at compile-time. A light bulb went off in my head as soon as I read this canonical metaprogramming example: #include <iostream> using namespace std; template< int n > struct factorial { enum { ret = factorial< n - 1 >::ret * n }; }; template<> struct factorial< 0 > { enum { ret = 1 }; }; int main() { cout << "7! = " << factorial< 7 >::ret << endl; // 5040 return 0; } If one wants to learn more about C++ static metaprogramming, what are the best sources (books, websites, on-line courseware, whatever)?

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  • write to fifo/pipe from shell, with timeout

    - by Tim
    I have a pair of shell programs that talk over a named pipe. The reader creates the pipe when it starts, and removes it when it exits. Sometimes, the writer will attempt to write to the pipe between the time that the reader stops reading and the time that it removes the pipe. reader: while condition; do read data <$PIPE; do_stuff; done writer: echo $data >>$PIPE reader: rm $PIPE when this happens, the writer will hang forever trying to open the pipe for writing. Is there a clean way to give it a timeout, so that it won't stay hung until killed manually? I know I can do #!/bin/sh # timed_write <timeout> <file> <args> # like "echo <args> >> <file>" with a timeout TIMEOUT=$1 shift; FILENAME=$1 shift; PID=$$ (X=0; # don't do "sleep $TIMEOUT", the "kill %1" doesn't kill the sleep while [ "$X" -lt "$TIMEOUT" ]; do sleep 1; X=$(expr $X + 1); done; kill $PID) & echo "$@" >>$FILENAME kill %1 but this is kind of icky. Is there a shell builtin or command to do this more cleanly (without breaking out the C compiler)?

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  • Why only one video shows up in ASP.NET Video panel ?

    - by user284523
    It is possible to have multiple videos with Flowplayer http://flowplayer.org/demos/installation/multiple-players.html To do so in ASP.NET DYNAMICALLY, one has to use a Panel (see http://idevwebs.com/Default.aspx?id=25): <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <!-- A minimal Flowplayer setup to get you started --> <!-- include flowplayer JavaScript file that does Flash embedding and provides the Flowplayer API. --> <script type="text/javascript" src="flowplayer-3.1.4.min.js"></script> <!-- page title --> <title>Minimal Flowplayer setup</title> </head><body> <form id="form1" runat="server"> <div id="page"> <h1>Minimal Flowplayer setup</h1> <p>View commented source code to get familiar with Flowplayer installation.</p> <!-- this A tag is where your Flowplayer will be placed. it can be anywhere --> <!-- player #1 --> <asp:Panel ID="panelVideo" runat="server"> </asp:Panel> <!-- this will install flowplayer inside previous A- tag. --> <script type="text/javascript"> flowplayer("player", "flowplayer-3.1.5.swf"); </script> <!-- after this line is purely informational stuff. does not affect on Flowplayer functionality --> <p> If you are running these examples <strong>locally</strong> and not on some webserver you must edit your <a href="http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager04.html"> Flash security settings</a>. </p> <p class="less"> Select "Edit locations" &gt; "Add location" &gt; "Browse for files" and select flowplayer-x.x.x.swf you just downloaded. </p> <h2>Documentation</h2> <p> <a href="http://flowplayer.org/documentation/installation/index.html">Flowplayer installation</a> </p> <p> <a href="http://flowplayer.org/documentation/configuration/index.html">Flowplayer configuration</a> </p> <p> See this identical page on <a href="http://flowplayer.org/demos/example/index.htm">Flowplayer website</a> </p> </div> </form> </body></html> and then add video anchor dynamically public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { this.panelVideo.Controls.Add(new LiteralControl("<a href=\"" + "http://blip.tv/file/get/" + "KimAronson-TwentySeconds58192" + ".flv\" style=\"display:block;width:388px;height:230px\" id=\"player\"></a>")); this.panelVideo.Controls.Add(new LiteralControl("<a href=\"" + "http://blip.tv/file/get/" + "KimAronson-TwentySeconds67463" + ".flv\" style=\"display:block;width:388px;height:230px\" id=\"player\"></a>")); } } But it works only partially as the first video shows up not both. And all html below doesn't show up either.

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  • Problem with fork exec kill when redirecting output in perl

    - by Edu
    I created a script in perl to run programs with a timeout. If the program being executed takes longer then the timeout than the script kills this program and returns the message "TIMEOUT". The script worked quite well until I decided to redirect the output of the executed program. When the stdout and stderr are being redirected, the program executed by the script is not being killed because it has a pid different than the one I got from fork. It seems perl executes a shell that executes my program in the case of redirection. I would like to have the output redirection but still be able to kill the program in the case of a timeout. Any ideas on how I could do that? A simplified code of my script is: #!/usr/bin/perl use strict; use warnings; use POSIX ":sys_wait_h"; my $timeout = 5; my $cmd = "very_long_program 1>&2 > out.txt"; my $pid = fork(); if( $pid == 0 ) { exec($cmd) or print STDERR "Couldn't exec '$cmd': $!"; exit(2); } my $time = 0; my $kid = waitpid($pid, WNOHANG); while ( $kid == 0 ) { sleep(1); $time ++; $kid = waitpid($pid, WNOHANG); print "Waited $time sec, result $kid\n"; if ($timeout > 0 && $time > $timeout) { print "TIMEOUT!\n"; #Kill process kill 9, $pid; exit(3); } } if ( $kid == -1) { print "Process did not exist\n"; exit(4); } print "Process exited with return code $?\n"; exit($?); Thanks for any help.

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  • Pinyin Character entry on a touchscreen keyboard

    - by mmr
    The app I'm developing requires that it be deployed in China, which means that it needs to have Pinyin and Chinese character handling. I'm told that the way that our customers handle character entry is like so: Enter in the pinyin character, like 'zhang' As they enter the characters, a list of possible Chinese (Mandarin?) characters are presented to the user, like: The user will then select '1' to enter the family name that is roughly translated to 'zhang' How can I hook such programs (I believe one is called 'mspy.exe', from Microsoft, which I'm lead to believe comes with Microsoft versions of XP) into a WPF text box? Right now, the user can enter text either by using their keyboard or by using an on-screen keyboard, so I will probably need to capture the event of a keypress from either source and feed it to some OS event or to MSPY.exe or some similar program. Or is there some other way to enter pinyin and have it converted to Mandarin? Is there a program other than MSPY I should look at? EDIT: For those of you who think that this should 'just work', it does not. Chinese character entry will work just fine if entering text into notepad or the start-run menu or whatever, but it will not work in WPF. That's the key to this question: how do I enable WPF entry? There's the Google Pinyin and Sogou pinyin, but the websites are in Mandarin or Chinese or something similar and I don't read the language.

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  • Dropdown dependent values to be fetch from multiple models using ajax in Yii

    - by newuser
    I searched all the documentation over Yii but not got the answer of it.So I came here finally. I have the following schema Table Schools +------------------+--------------+------+-----+---------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+--------------+------+-----+---------------------+----------------+ | id | int(10) | NO | PRI | NULL | auto_increment | | school_name | varchar(100) | NO | | | | +------------------+--------------+------+-----+---------------------+----------------+ Table Students +------------------+--------------+------+-----+---------------------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------------+--------------+------+-----+---------------------+----------------+ | id | int(10) | NO | PRI | NULL | auto_increment | | school_id | int(10) | NO | FK | | | | student_name | varchar(100) | NO | | | | | roll_no | varchar(80) | NO | | | | | class | varchar(20) | NO | | | | | | subjects | varchar(100) | NO | | | | +------------------+--------------+------+-----+---------------------+----------------+ I have made models and CRUD for the both models.In models my relation is like this In Students.php the relation is like public function relations() { // NOTE: you may need to adjust the relation name and the related // class name for the relations automatically generated below. return array( 'School' => array(self::BELONGS_TO,'Schools','school_id'), ); } In Schools.php the relation is like public function relations() { // NOTE: you may need to adjust the relation name and the related // class name for the relations automatically generated below. return array( 'student' => array(self::HAS_MANY, 'Students', 'school_id'), ); } Now I made the two models rendered in a single page so that I can enter all the respective fields in a single form. In the _form.php file of Students I have made some change in student_name like this <div class="row"> <?php echo $form->labelEx($model,'student_name'); ?> <?php echo $form->dropdownList($model,'student_name', CHtml::listData(Students::model()->findAll(), 'id', 'student_name'), array('empty'=>array('Select'=>'--Select One---'))); ?> <?php echo $form->error($model,'student_name'); ?> Now for this piece of code I got all the student name from the Student model. So my problem is when I am getting the student name from the dropdown list and going to select a student it will also fetch all the respective values of the student to be rendered in the _form.php without click on save button.So that user don't have to put it again manually. I think ajax and json encode will work here but don't know how to make them work here. [Update] Here is StudentsController code public function actionDisCoor() { $model = School::model()->findByPk($_POST['Students']['student_id']); $data=CHtml::listData($data,'id','name'); foreach($data as $value=>$name) { echo CHtml::tag('option',array('value'=>$value),CHtml::encode($name),true); } } Here is _form.php code for Students <div class="row"> <?php echo $form->labelEx($model,'student_name'); ?> <?php $List = CHtml::listData(Students::model()->findAll(), 'id', 'student_name'); ?> <?php echo $form->dropdownList($model,'student_name',$List, array('onChange'=>CHtml::ajax(array( 'url' => CController::createUrl('DisCoor'), 'type' => 'POST', 'update'=>'#school_id', )),'style'=>'width:180px;' ) )?> <?php echo $form->error($model,'student_name'); ?> </div> After all that when I saw in firebug I got the error.Here is the screen shot

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  • 1k of Program Space, 64 bytes of RAM. Is assembly an absolute must?

    - by Earlz
    (If your lazy see bottom for TL;DR) Hello, I am planning to build a new (prototype) project dealing with physical computing. Basically, I have wires. These wires all need to have their voltage read at the same time. More than a few hundred microseconds difference between the readings of each wire will completely screw it up. The Arduino takes about 114 microseconds. So the most I could read is 2 or 3 wires before the latency would skew the accuracy of the readings. So my plan is to have an Arduino as the "master" of an array of ATTinys. The arduino is pretty cramped for space, but it's a massive playground compared to the tinys. An ATTiny13A has 1k of flash ROM(program space), 64 bytes of RAM, and 64 bytes of (not-durable and slow) EEPROM. (I'm choosing this for price as well as size) The ATTinys in my system will not do much. Basically, all they will do is wait for a signal from the Master, and then read the voltage of 1 or 2 wires and store it in RAM(or possibly EEPROM if it's that cramped). And then send it to the Master using only 1 wire for data.(no room for more than that!). So far then, all I should have to do is implement trivial voltage reading code (using built in ADC). But this communication bit I'm worried about. Do you think a communication protocol(using just 1 wire!) could even be implemented in such constraints? TL;DR: In less than 1k of program space and 64 bytes of RAM(and 64 bytes of EEPROM) do you think it is possible to implement a 1 wire communication protocol? Would I need to drop to assembly to make it fit? I know that currently my Arduino programs linking to the Wiring library are over 8k, so I'm a bit concerned.

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  • Testing a Non-blocking Queue

    - by jsw
    I've ported the non-blocking queue psuedocode here to C#. The code below is meant as a near verbatim copy of the paper. What approach would you take to test the implementation? Note: I'm running in VS2010 so I don't have CHESS support yet. using System.Threading; #pragma warning disable 0420 namespace ConcurrentCollections { class QueueNodePointer<T> { internal QueueNode<T> ptr; internal QueueNodePointer() : this(null) { } internal QueueNodePointer(QueueNode<T> ptr) { this.ptr = ptr; } } class QueueNode<T> { internal T value; internal QueueNodePointer<T> next; internal QueueNode() : this(default(T)) { } internal QueueNode(T value) { this.value = value; this.next = new QueueNodePointer<T>(); } } public class ConcurrentQueue<T> { private volatile int count = 0; private QueueNodePointer<T> qhead = new QueueNodePointer<T>(); private QueueNodePointer<T> qtail = new QueueNodePointer<T>(); public ConcurrentQueue() { var node = new QueueNode<T>(); node.next.ptr = null; this.qhead.ptr = this.qtail.ptr = node; } public int Count { get { return this.count; } } public void Enqueue(T value) { var node = new QueueNode<T>(value); node.next.ptr = null; QueueNodePointer<T> tail; QueueNodePointer<T> next; while (true) { tail = this.qtail; next = tail.ptr.next; if (tail == this.qtail) { if (next.ptr == null) { var newtail = new QueueNodePointer<T>(node); if (Interlocked.CompareExchange(ref tail.ptr.next, newtail, next) == next) { Interlocked.Increment(ref this.count); break; } else { Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(next.ptr), tail); } } } } Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(node), tail); } public T Dequeue() { T value; while (true) { var head = this.qhead; var tail = this.qtail; var next = head.ptr.next; if (head == this.qhead) { if (head.ptr == tail.ptr) { if (next.ptr == null) { return default(T); } Interlocked.CompareExchange(ref this.qtail, new QueueNodePointer<T>(next.ptr), tail); } else { value = next.ptr.value; var newhead = new QueueNodePointer<T>(next.ptr); if (Interlocked.CompareExchange(ref this.qhead, newhead, head) == head) { Interlocked.Decrement(ref this.count); break; } } } } return value; } } } #pragma warning restore 0420

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  • How do I create a good evaluation function for a new board game?

    - by A. Rex
    I write programs to play board game variants sometimes. The basic strategy is standard alpha-beta pruning or similar searches, sometimes augmented by the usual approaches to endgames or openings. I've mostly played around with chess variants, so when it comes time to pick my evaluation function, I use a basic chess evaluation function. However, now I am writing a program to play a completely new board game. How do I choose a good or even decent evaluation function? The main challenges are that the same pieces are always on the board, so a usual material function won't change based on position, and the game has been played less than a thousand times or so, so humans don't necessarily play it enough well yet to give insight. (PS. I considered a MoGo approach, but random games aren't likely to terminate.) Any ideas? Game details: The game is played on a 10-by-10 board with a fixed six pieces per side. The pieces have certain movement rules, and interact in certain ways, but no piece is ever captured. The goal of the game is to have enough of your pieces in certain special squares on the board. The goal of the computer program is to provide a player which is competitive with or better than current human players.

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  • How do I search using the Google Maps API?

    - by Thomas
    Hello all, I'm trying to figure out how to search for nearby businesses in an iPhone app using the Google Maps API. I'm completely new to Javascript, and have waded through some of Google's sample code easily enough. I found how to grab the user's current location. Now I want to search for "restaurants" near that location. I'm just building on the sample code from here. I'll post it below with my changes anyway, just in case. <html> <head> <meta name="viewport" content="initial-scale=1.0, user-scalable=no" /> <meta http-equiv="content-type" content="text/html; charset=UTF-8"/> <title>Google Maps JavaScript API v3 Example: Map Geolocation</title> <script type="text/javascript" src="http://maps.google.com/maps/api/js?sensor=true"></script> <script type="text/javascript" src="http://code.google.com/apis/gears/gears_init.js"></script> <script type="text/javascript"> var currentLocation; var detroit = new google.maps.LatLng(42.328784, -83.040877); var browserSupportFlag = new Boolean(); var map; var infowindow = new google.maps.InfoWindow(); function initialize() { var myOptions = { zoom: 6, mapTypeId: google.maps.MapTypeId.ROADMAP }; map = new google.maps.Map(document.getElementById("map_canvas"), myOptions); map.enableGoogleBar(); // Try W3C Geolocation method (Preferred) if(navigator.geolocation) { browserSupportFlag = true; navigator.geolocation.getCurrentPosition(function(position) { // TRP - Save current location in a variable (currentLocation) currentLocation = new google.maps.LatLng(position.coords.latitude,position.coords.longitude); // TRP - Center the map around current location map.setCenter(currentLocation); }, function() { handleNoGeolocation(browserSupportFlag); }); } else { // Browser doesn't support Geolocation browserSupportFlag = false; handleNoGeolocation(browserSupportFlag); } } function handleNoGeolocation(errorFlag) { if (errorFlag == true) { // TRP - Default location is Detroit, MI currentLocation = detroit; contentString = "Error: The Geolocation service failed."; } else { // TRP - This should never run. It's embedded in a UIWebView, running on iPhone contentString = "Error: Your browser doesn't support geolocation."; } // TRP - Set the map to the default location and display the error message map.setCenter(currentLocation); infowindow.setContent(contentString); infowindow.setPosition(currentLocation); infowindow.open(map); } </script> </head> <body style="margin:0px; padding:0px;" onload="initialize()"> <div id="map_canvas" style="width:100%; height:100%"></div> </body> </html>

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  • Help needed with drawRect:

    - by Andrew Coad
    Hi, I'm having a fundamental issue with use of drawRect: Any advice would be greatly appreciated. The application needs to draw a variety of .png images at different times, sometimes with animation, sometimes without. A design goal that I was hoping to adhere to is to have the code inside drawRect: very simple and "dumb" - i.e. just do drawing and no other application logic. To draw the image I am using the drawAtPoint: method of UIImage. Since this method does not take a CGContext as a parameter, it can only be called within the drawRect: method. So I have: - (void)drawRect:(CGRect)rect { [firstImage drawAtPoint:CGPointMake(firstOffsetX, firstOffsetY)]; } All fine and dandy for one image. To draw multiple images (over time) the approach I have taken is to maintain an array of dictionaries with each dictionary containing an image, the point location to draw at and a flag to enable/suppress drawing for that image. I add dictionaries to the array over time and trigger drawing via the setNeedsDisplay: method of UIView. Use of an array of dictionaries allows me to completely reconstruct the entire display at any time. drawRect: now becomes: - (void)drawRect:(CGRect)rect { for (NSMutableDictionary *imageDict in [self imageDisplayList]) { if ([[imageDict objectForKey:@"needsDisplay"] boolValue]) { [[imageDict objectForKey:@"image"] drawAtPoint:[[imageDict objectForKey:@"location"] CGPointValue]]; [imageDict setValue:[NSNumber numberWithBool:NO] forKey:@"needsDisplay"]; } } } Still OK. The code is simple and compact. Animating this is where I run into problems. The first problem is where do I put the animation code? Do I put it in UIView or UIViewController? If in UIView, do I put it in drawRect: or elsewhere? Because the actual animation depends on the overall state of the application, I would need nested switch statements which, if put in drawRect:, would look something like this: - (void)drawRect:(CGRect)rect { for (NSMutableDictionary *imageDict in [self imageDisplayList]) { if ([[imageDict objectForKey:@"needsDisplay"] boolValue]) { switch ([self currentState]) { case STATE_1: switch ([[imageDict objectForKey:@"animationID"] intValue]) { case ANIMATE_FADE_IN: [self setAlpha:0.0]; [UIView beginAnimations:[[imageDict objectForKey:@"animationID"] intValue] context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationCurve:UIViewAnimationCurveEaseIn]; [UIView setAnimationDuration:2]; [self setAlpha:1.0]; break; case ANIMATE_FADE_OUT: [self setAlpha:1.0]; [UIView beginAnimations:[[imageDict objectForKey:@"animationID"] intValue] context:nil]; [UIView setAnimationDelegate:self]; [UIView setAnimationCurve:UIViewAnimationCurveEaseOut]; [UIView setAnimationDuration:2]; [self setAlpha:0.0]; break; case ANIMATE_OTHER: // similar code here break; default: break; } break; case STATE_2: // similar code here break; default: break; } [[imageDict objectForKey:@"image"] drawAtPoint:[[imageDict objectForKey:@"location"] CGPointValue]]; [imageDict setValue:[NSNumber numberWithBool:NO] forKey:@"needsDisplay"]; } } [UIView commitAnimations]; } In addition, to make multiple sequential animations work correctly, there would need to be an outer controlling mechanism involving the animation delegate animationDidStop: callback that would set the needsDisplay entries in the dictionaries to allow/suppress drawing (and animation). The point that we are at now is that it all starts to look very ugly. More specifically: drawRect: starts to bloat quickly and contain code that is not "just drawing" code the UIView needs implicit awareness of the application state the overall process of drawing is now spread across three methods at a minimum And on to the point of this post: how can I do this better? What would the experts out there recommend in terms of overall structure? How can I keep application state information out of the view? Am I looking at this problem from the wrong direction. Is there some completely different approach that I should consider?

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  • Mysql 100% CPU + Slow query

    - by felipeclopes
    I'm using the RDS database from amazon with a some very big tables, and yesterday I started to face 100% CPU utilisation on the server and a bunch of slow query logs that were not happening before. I tried to check the queries that were running and faced this result from the explain command +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ | 1 | SIMPLE | businesses | const | PRIMARY | PRIMARY | 4 | const | 1 | Using index; Using temporary; Using filesort | | 1 | SIMPLE | activities_businesses | ref | PRIMARY,index_activities_users_on_business_id,index_tweets_users_on_tweet_id_and_business_id | index_activities_users_on_business_id | 9 | const | 2252 | Using index condition; Using where | | 1 | SIMPLE | activities_b_taggings_975e9c4 | ref | taggings_idx | taggings_idx | 782 | const,myapp_production.activities_businesses.id,const | 1 | Using index condition; Using where | | 1 | SIMPLE | activities | eq_ref | PRIMARY,index_activities_on_created_at | PRIMARY | 8 | myapp_production.activities_businesses.activity_id | 1 | Using where | +----+-------------+-------------------------------+--------+----------------------------------------------------------------------------------------------+---------------------------------------+---------+-----------------------------------------------------------------+------+----------------------------------------------+ Also checkin in the process list, I got something like this: +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +----+-----------------+-------------------------------------+----------------------------+---------+------+--------------+------------------------------------------------------------------------------------------------------+ | 1 | my_app | my_ip:57152 | my_app_production | Sleep | 0 | | NULL | | 2 | my_app | my_ip:57153 | my_app_production | Sleep | 2 | | NULL | | 3 | rdsadmin | localhost:49441 | NULL | Sleep | 9 | | NULL | | 6 | my_app | my_other_ip:47802 | my_app_production | Sleep | 242 | | NULL | | 7 | my_app | my_other_ip:47807 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 8 | my_app | my_other_ip:47809 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 9 | my_app | my_other_ip:47810 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 10 | my_app | my_other_ip:47811 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | | 11 | my_app | my_other_ip:47813 | my_app_production | Query | 231 | Sending data | SELECT my_fields... | ... So based on the numbers, it looks like there is no reason to have a slow query, since the worst execution plan is the one that goes through 2k rows which is not much. Edit 1 Another information that might be useful is the slow query_log SET timestamp=1401457485; SELECT my_query... # User@Host: myapp[myapp] @ ip-10-195-55-233.ec2.internal [IP] Id: 435 # Query_time: 95.830497 Lock_time: 0.000178 Rows_sent: 0 Rows_examined: 1129387 Edit 2 After profiling, I got this result. The result have approximately 250 rows with two columns each. +----------------------+----------+ | state | duration | +----------------------+----------+ | Sending data | 272 | | removing tmp table | 0 | | optimizing | 0 | | Creating sort index | 0 | | init | 0 | | cleaning up | 0 | | executing | 0 | | checking permissions | 0 | | freeing items | 0 | | Creating tmp table | 0 | | query end | 0 | | statistics | 0 | | end | 0 | | System lock | 0 | | Opening tables | 0 | | logging slow query | 0 | | Sorting result | 0 | | starting | 0 | | closing tables | 0 | | preparing | 0 | +----------------------+----------+ Edit 3 Adding query as requested SELECT activities.share_count, activities.created_at FROM `activities_businesses` INNER JOIN `businesses` ON `businesses`.`id` = `activities_businesses`.`business_id` INNER JOIN `activities` ON `activities`.`id` = `activities_businesses`.`activity_id` JOIN taggings activities_b_taggings_975e9c4 ON activities_b_taggings_975e9c4.taggable_id = activities_businesses.id AND activities_b_taggings_975e9c4.taggable_type = 'ActivitiesBusiness' AND activities_b_taggings_975e9c4.tag_id = 104 AND activities_b_taggings_975e9c4.created_at >= '2014-04-30 13:36:44' WHERE ( businesses.id = 1 ) AND ( activities.created_at > '2014-04-30 13:36:44' ) AND ( activities.created_at < '2014-05-30 12:27:03' ) ORDER BY activities.created_at; Edit 4 There may be a chance that the indexes are not being applied due to difference in column type between the taggings and the activities_businesses, on the taggable_id column. mysql> SHOW COLUMNS FROM activities_businesses; +-------------+------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-------------+------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | activity_id | bigint(20) | YES | MUL | NULL | | | business_id | bigint(20) | YES | MUL | NULL | | +-------------+------------+------+-----+---------+----------------+ 3 rows in set (0.01 sec) mysql> SHOW COLUMNS FROM taggings; +---------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+--------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | tag_id | int(11) | YES | MUL | NULL | | | taggable_id | bigint(20) | YES | | NULL | | | taggable_type | varchar(255) | YES | | NULL | | | tagger_id | int(11) | YES | | NULL | | | tagger_type | varchar(255) | YES | | NULL | | | context | varchar(128) | YES | | NULL | | | created_at | datetime | YES | | NULL | | +---------------+--------------+------+-----+---------+----------------+ So it is examining way more rows than it shows in the explain query, probably because some indexes are not being applied. Do you guys can help m with that?

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  • Need help finding a good curriculum/methodology for self-teaching to program from scratch

    - by BrotherGA2
    My friend and I have both dedicated ourselves to learning the essentials of programming by June of this year from nearly no programming experience. I have done some research and have come to the conclusion that using the Python language will be the best for us, but I am open to suggestions with good reasoning behind them. My motives for learning programming are: Potential Career Path to be able to create programs that can: solve problems; entertain, i.e. useful applications and games. Online college lectures + book (which I am willing to purchase) sounds like a good combination, but I do not know which would be most suitable for me. tl;dr: What I would like to find from the excellent people here is the following: a good, potentially best, programming course and/or book that is well structured and uses good pedagogy so that a person dedicated to learn programming may do so by following its curriculum (or use it to develop a curriculum) over the course of a few months. Thanks! (I apologize if this type of question is not considered proper etiquette, but I haven't found a consensus on this, and would like some guidance beyond the research I've already done)

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  • Cutting Ubuntu to the bone for Virtualbox VM

    - by Monty
    I've been looking around for a Linux variant which will install only the software I need rather than everything Ubuntu (for example) puts in by default. This is to create a virtual machine in Virtualbox which has bash, apache, python, perl, SQLite, openssh and a few other programs but nothing else. I'd prefer to go with Ubuntu if possible but another modern distro would do as well (I like using apt-get and yum rather than downloading/compiling etc). So far, I've tried: SuseStudio.com, which is probably the best so far. Pressing F4 to get the boot options on Ubuntu 9.10, but there is no minimal installation (I think there was once). Arch Linux, slightly confusing install procedure but I might go back and try again. Gentoo, started well but fairly soon the HD on the virtual machine went to 2Gb, even before the installation had started in earnest (I'd partitioned the disks is all). I realise there are various "small" Linuxes around like Puppy, Feather, DSL, etc, but they seem to be aimed at desktop users or as a techie's toolkit, and I want a small-as-possible server distro which can be managed with tools like apt or yum or similar. TIA for any advice you can offer! -- Monty

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  • Looking for good PHP editor or IDE with 'IntelliSense'

    - by Andrew
    Hello, I'm looking for suitable PHP Editor or IDE with syntax auto-completion. I've tried trial versions of programs like Zend Studio, PHPDesigner, NetBeans PHP, NuSphere PhpED, and similar -- but none of them fully satisfied me. I quite liked hint window with detailed info about what function does and what it returns. Also I liked the way NetBeans auto-complete code (for example inserts all required parameters in function declaration as "dummy fields" and then you can jump between them using TAB in order to edit them). On the other hand, environment of NetBeans doesn't belong to the nicest. In this regard I prefer PHPDesigner with its sleek and light interface. At this moment I don't use any of the debugging options, since I don't know yet how to use profiller, breakpoints, watches and what not, so at this point my only concern is good autocompletion. For this purpose NetBean would be great choice, but with future in mind I am not sure debugging will be good in NetBeans, especially as I would prefer to use remote Linux server for this. So in short, I'm looking for editor that: Have similar code auto-completion (IntelliSense) like NetBeans Allow you to debug code using remote server (or sets up own debugging server like PHPDesigner does) without need to run Apache and similar on local computer Is preferably easy to use / intuitive interface Any ideas?

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  • How do programming languages bind identifiers to functions

    - by sub
    I'm talking about C and/or C++ here as this are the only languages I know used for interpreters where the following could be a problem: If we have an interpreted language X how can a library written for it add functions to the language which can then be called from within programs written in the language? PHP example: substr( $str, 5, 10 ); How is the function substr added to the "function pool" of PHP so it can be called from within scripts? It is easy for PHP storing all registered function names in an array and searching through it as a function is called in a script. However, as there obviously is no eval in C(++), how can the function then be called? I assume PHP doesn't have 100MB of code like: if( identifier == "substr" ) { return PHP_SUBSTR(...); } else if( ... ) { ... } Ha ha, that would be pretty funny. I hope you have understood my question so far. How do interpreters solve this problem? How can I solve this for my own experimental toy interpreter?

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