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• Why would SQL be very slow when doing updates?

  - by ooo

  Suddenly doing updates into a few tables have gotten 10 times slower than they used to be. What are some good recommendations to determine root cause and optimization? Could it be that indexing certain columns are causing updates to be slow? Any other recommendations? I guess more important than guesses would be help on the process of identifying the root cause or metrics around performance. Is there anything in Fluent NHibernate that you can use to help identify the root cause of performance issues?

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• (newbie) type signature "Maybe a" doesn't like "Just [Event]"

  - by sisif

  i'm still learning Haskell and need help with the type inference please! using packages SDL and Yampa i get the following type signature from FRP.Yampa.reactimate: (Bool -> IO (DTime, Maybe a)) and i want to use it for: myInput :: Bool -> IO (DTime, Maybe [SDL.Event]) myInput isBlocking = do event <- SDL.pollEvent return (1, Just [event]) ... reactimate myInit myInput myOutput mySF but it says Couldn't match expected type `()' against inferred type `[SDL.Event]' Expected type: IO (DTime, Maybe ()) Inferred type: IO (DTime, Maybe [SDL.Event]) In the second argument of `reactimate', namely `input' In the expression: reactimate initialize input output process i thought "Maybe a" allows me to use anything, even a SDL.Event list? why is it expecting "Maybe ()" when the type signature is actually "Maybe a"? why does it want an empty tuple, or a function taking no arguments, or what is () supposed to be?

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• "Inlining" (kind of) functions at runtime in C

  - by fortran

  Hi, I was thinking about a typical problem that is very JIT-able, but hard to approach with raw C. The scenario is setting up a series of function pointers that are going to be "composed" (as in maths function composition) once at runtime and then called lots and lots of times. Doing it the obvious way involves many virtual calls, that are expensive, and if there are enough nested functions to fill the CPU branch prediction table completely, then the performance with drop considerably. In a language like Lisp, I could probably process the code and substitute the "virtual" call by the actual contents of the functions and then call compile to have an optimized version, but that seems very hacky and error prone to do in C, and using C is a requirement for this problem ;-) So, do you know if there's a standard, portable and safe way to achieve this in C? Cheers

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• Program quits if pipe is closed

  - by givemelight

  I am trying to write to a pipe using C++. The following code gets called in an extra thread: void writeToPipe() { int outfifo; char buf[100]; char outfile[] = "out"; mknod(outfile, S_IFIFO | 0666, 0); if ((outfifo = open(outfile, O_WRONLY)) < 0) { perror("Opening output fifo failed"); return false; } int currentTimestamp = (int)time(0); int bufLen = sprintf(bug, "Time is %d.", currentTimestamp); write(outfifo, buf, bufLen); } The thread is called in main using: thread writeThread(writeToPipe); writeThread.detach(); If the pipe is not opened by another process, the C++ program just quits without an error. I don't know how to check if the pipe is opened.

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• updating the values in detail view from another view....

  - by praseed

  Hi friends, i am building one app almost similar to contact management system...in which i have a detail view .. on pressing one of the table cells, a new view will be shown were the user can enter the new values and on pressing the save button the values will be updated in the database. On going back to the detail view the user should be able to see the updated values in the table cells.. or how can i update the values in detail view from another view...? i came to know that this can be acheived through Appdelegate objects ... but i couldnt understand wat is it or how it is done.... may be bcuz i am new to iPhone apps development... Pls can anyone explain me the process..

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• How to tell if there is an available thread in a thread pool in java

  - by Gormcito

  I am trying to proccess a queue of tasks from a database table as fast as possible while also limiting the number of threads to process the tasks. I am using a fixed sized thread pool with Executors.newFixedThreadPool(N); I want to know if there is a way of knowing if the thread pool is full, by that I mean are there currently 50 threads running, if so then I'll wait for a thread to be available before starting a new one instead of sleeping the main thread. Code of what I would like to do: ExecutorService executor = Executors.newFixedThreadPool(N); ResultSet results; while( true ) { results = getWaitingTasksStmt.executeQuery(); while( results.next() && executor.notFull() ) { executor.submit( new thread( new runnableInheritedClass(results) ) ); } }

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• JMS On demand Support Active MQ with Spring

  - by user345275

  Hi Team I am involving in SMS Gate way project. The Very Base function is our system have couple of Customers They will send their request to our gateway in a form of XML. Those request is Process first and send it to a common out bound JMS(ActiveMQ 5.3 ) There is an listener running on which should be capable of doing the following 1. Retrive Bunch of Messages(Let say 5 ) on retrieval. 2. The retival should be on demand .It means ,once the listeners triggers only those bunch of message should return . Guys i really need ur help.If you have any idea please help me ou

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• Looking for an example of selecting a row(s) with multiple columns from a grid view and add them to

  Here is the situation dealing with a vb.net website, I have students who will be enrolled into a course. The student grid view has many columns like client_no, student_name, date_of_birth, address, etc. There are over 100000 students so I will need to filter the student grid view to find the correct student to enroll in the course. Once they are found, the user selects them and somehow moves them to the enrolled grid view. If a student drops out then they would be removed from the enrolled grid view. This process needs to be easy to understand and use. Are there any examples available or other suggestions on how to do this?

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• Save information from MS crash reporter?

  - by DGentry

  On Windows XP when a process crashes, we get a dialog box with a link: "To view technical information about the error report, click here." The "click here" link brings up a whole lot of information in a window, but no obvious way to save it to a file. Is there a way? It would be very nice to be able to send that data to several different external vendors we're working with. The only other option I see in the dialog box is to send it to Microsoft, but this crash is likely not Microsoft's fault and there is no reason to send it to them.

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• Install a certficate on a device

  - by Vaccano

  I need to install a certificate on a Windows Mobile device. I have tried creating a cab file to do it, but the cab file fails to run. I have a lot of devices that are not all physically near me that I am going to need to put this on, so any manual process is just not feasible (ie, if it needs active sync then it is not going to work). Any ideas on how to do this? Visual Studio does not seem to support what I am trying to do.

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• Java-Counting occurrence of word from huge textfile

  - by Naveen

  I have a text file of size 115MB. It consists of about 20 million words. I have to use the file as a word collection, and use it to search the occurrence of each user-given words from the collection. I am using this process as a small part in my project. I need a method for finding out the number of occurrence of given words in a faster and correct manner since i may use it in iterations. I am in need of suggestion about any API that i can make use or some other way that performs the task in a quicker manner. Any recommendations are appreciated.

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• FLIR: avoiding ugly page loads

  - by justinbach

  I'm building a site that makes extensive use of FLIR to allow the use of non-websafe fonts. However, pageloads are an ugly process, as first the HTML text version of each field loads and then (a few hundred milliseconds later) it's replaced by its FLIR image counterpart. Is there any way to avoid this sort of thing? I've got a client presentation in a few hours and I know it'll raise eyebrows. My situation is sort of related to this question which is in regards to sIFR, not FLIR. Any ideas? Thanks, Justin

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• Given a user control with a form containing validation can I validate entirely server side?

  - by JoshBaltzell

  We have an existing User Control that was built to dynamically generate a web form for an end user. This form includes required field validators, custom validators that use server side code and Regular Expression validatiors. We now have a need to use all these validators to verify that all the needed data is entered when using a separate ordering process that cannot be validated in the same way, but has the same validation requirements before it is added to the database. I would like to use this user control to validate the input by passing it all the values and checking the validation summary. The only way I know how to do this is to render it to a page on the client side and trigger the form submit. Is there any way to populate and validate a web form entirely on the server side?

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• Outlook 2007 plugin

  - by JL

  I am about to embark on my first outlook 2007 plugin. I would like to create a new tool bar that will have a button that will initially be disabled. When the user selects a message the button should be enabled... but only if the email is of a certain type of email... This is where I need your expert advice, is there a way to quickly flag an email in outlook, so that in the email select event you can look for a property of that email... for example... on_select if mail.type = "FromISP" then I would prefer not to use the from field.... the other thing is during the send process I need to set the flag, I am doing this again using .net so I have full control over how the mail is created. Any ideas would help... Thanks

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• Extracting friends' E-Mail addresses from Facebook (Skype?)

  - by chephy

  I am currently in the process of migrating away from Facebook (privacy concerns, mostly). For obvious reasons, I want to save away the email addresses from my friends' profile pages. However, this turned out to be a rather hard task, because the Facebook API doesn't let you access any mail addresses. However, I just tried the automatic contact import feature of Skype, and it seems to be able to retrieve the email addresses of my friends from Facebook. Does anyone know how it's done so I could replicate it?

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• Trimming strings in Go

  - by user1263980

  I'm trying to read an entire line from the console (including whitespace), then process it. Using bufio.ReadString, the newline character is read together with the input, so I came up with the following code to trim the newline character: input,_:=src.ReadString('\n') inputFmt:=input[0:len(input)-2]+"" Is there a more idiomatic way to do this? That is, is there already a library that takes care of the ending null byte when extracting substrings for you? (Yes, I know there is already a way to read a line without the newline character in go readline -> string but I'm looking more for elegant string manipulation.)

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• Several ways to call a windows batch file from another one or from prompt. Which one in which case?

  - by dim

  A windows batch file (called.bat or called.cmd) can be called from another batch file (caller.bat or caller.cmd) or interactive cmd.exe prompt in several ways: direct call: called.bat using call command: call called.bat using cmd command: cmd /c called.bat using start command: start called.bat I'm quite in trouble to differentiate their intended usage based on their help text: when to use which one? e.g. why I might use 'call' command instead of direct call. What's different? I'm interested on some summary report that analyze all 4 possibilities (and others if any missing) from various point of views: recommended use cases for which they are designed to fit, process spawning, execution context, environment, return code processing. Note: I'm using Windows XP SP3.

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• Export SQL Binary/BLOB Data?

  - by davemackey

  Recently a software application we utilize upgraded from ASP to ASP.NET. In the process they abandoned the old web-based product and rewrote the entire UI, using new DB tables. The old DB tables still exist in the database and contain legacy files in binary or blob formats. I'm wondering if there is an easy way to export all these legacy files from the database to the filesystem (NTFS)? Then we could delete these old unused tables and save a few GB of space in the DB backups, etc.

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• Length of text that can just fit into one screen without scrolling

  - by KailZhang

  I find some iphone book apps have such feature: One screen one page of text without scrolling. The text can just fit into the whole screen with linebreaks and indentations. I'm curious of how to implement this. How could I decide the length of text that just fit into the screen. And also, given the whole text, I can calculate out the number of pages. If this is not possible to be done on iPhone(runtime?), then is it possible to process the text before storing it in app? I mean I calculate how many pages I need(how to split the raw text), probably how many lines per page.

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• how to convert the string into json object?

  - by Holicreature

  I use the ajax which sends back a string.. I want to convert the responsetext into a json object to process. I tried eval and also , but doesn't works... Wht to do? My code is function handleResponse() { if(httpa.readyState == 4){ var response = httpa.responseText; if(response!='empty') { alert(response); var foo = eval('(' +strJSON+ ')'); alert (foo); } } } // response alerts [{"id":"1","name":"Pepsodent 100g","selling_price":"28.75"},{"id":"2","name":"Pepsodent 40g","selling_price":"18.90"},{"id":"3","name":"Pepsodent brush","selling_price":"19.50"}]

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• How to find the real problem line in my code with Application Verifier ?

  - by Newbie

  I am now trying to use this Application Verifier debugging tool, but i am stuck, first of all: it breaks the program at a line that is simple variable set line (s = 1; for example) Secondly, now when i run this program under debugger, my program seems to have changed its behaviour: i am drawing image, and now one of the colors has changed o_O, all those parts of the image that i dont draw on, has changed the color to #CDCDCD when it should be #000000, and i already set the default color to zero, still it becomes to #CDCDCD. How do i make any sense to this? Here is the output AV gave me: VERIFIER STOP 00000002: pid 0x8C0: Access violation exception. 14873000 : Invalid address causing the exception 004E422C : Code address executing the invalid access 0012EB08 : Exception record 0012EB24 : Context record AVRF: Noncontinuable verifier stop 00000002 encountered. Terminating process ... The program '[2240] test.exe: Native' has exited with code -1073741823 (0xc0000001).

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• Processing a method after the view has loaded..

  - by Susanth

  Hi ! I have implemented a subview which is supposed to load immediately when I click a button in the parent view. After loading the subview(which is basically holding an activityindicator), the program is supposed to process a method(which gets data from a server, so takes time) in it. However, I am unable to do it. What happens now is, when I click the button on the parent view, it processes the method first and only after that does the subview load on screen. Why is this so? Is there any specific functions I could use to make my method load only after the view has loaded?

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• Considerations when porting a MS VC++ program (single machine) to a rocks cluster

  - by Mel

  I am trying to port a MS VC++ program to run on a rocks cluster! I am not very good with linux but I am eager to learn and I imagine porting it wouldn't be an impossible task for me. However, I do not understand how to take advantage of the cluster nodes. because it seems that the code execute only runs on the front end server (obviously). I have read a little about MPI and its seems like I should use MPI to comminicate between nodes. The program is currently written such that I have a main thread that synchronizes all worker threads. The main thread also recieves commands to manipulate the simulation or query its state. If the simulation is properly setup, communication between executing threads can be significantly minimized. What I don't understand is how do I start the process on the compute nodes and how do I handle failures in nodes? And maybe there should be other things I should also consider when porting my program to run in a cluster?

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• using drupal 6 or 7 for a new PHP web application?

  - by ajsie

  if i create a new web application tomorrow, should i use Drupal 6 or 7? i have never used drupal before so i have to start learning it first (very familiar with PHP) so i can understand the basics and how to extend it. my concerns for using 7: no modules contributed yet? so i dont have all the fancy stuff i can add like in Drupal 6? no good documentation and lack of web tutorials? how could i learn about it if there is not that much support? too early in the development process? it's not stable enough? i would like to use 7 cause i dont want to relearn everything and 7 is indeed just around the corner. but im afraid that it lacks all other stuff version 6 has. could someone guide me into right direction? thanks

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• setfsuid() and python 2.5.4

  - by user331398

  Hi, I'm trying to use setfsuid() with python 2.5.4 and RHEL 5.4. Since it's not included in the os module, I wrapped it in a C module of my own and installed it as a python extension module using distutils. However when I try to use it I don't get the expected result. setfsuid() returns value indicating success (changing from a superuser), but I can't access files to which only the newly set user should have user access (using open()), indicating that fsuid was not truely changed. I tried to verify setfsuid() worked, by running it consecutively twice with the same user input The result was as if nothing had changed, and on every call the returned value was of old user id different from the new one. I also called getpid() from the module, and from the python script, both returned the same id. so this is not the problem. Just in case it's significant, I should note that I'm doing all of this from within an Apache daemon process (WSGI). Anyone can provide an explanation to that? Thank you

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