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• Java bytecode compiler benchmarks

  - by Dave Jarvis

  Q.1. What free compiler produces the fastest executable Java bytecode? Q.2. What free virtual machine executes Java bytecode the fastest (on 64-bit multi-core CPUs)? Q.3. What other (currently active) compiler projects are missing from this list: http://www.ibm.com/developerworks/java/jdk/ http://gcc.gnu.org/java/ http://openjdk.java.net/groups/compiler/ http://java.sun.com/javase/downloads/ http://download.eclipse.org/eclipse/downloads/ Q.4. What performance improvements can compilers do that JITs cannot (or do not)? Q.5. Where are some recent benchmarks, comparisons, or shoot-outs (for Q1 or Q2)? Thank you!

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• MS Sql Full-text search vs. LIKE expression

  - by Marks

  Hi. I'm currently looking for a way to search a big database (500MB - 10GB or more on 10 tables) with a lot of different fields(nvarchars and bigints). Many of the fields, that should be searched are not in the same table. An example: A search for '5124 Peter' should return all items, that ... have an ID with 5124 in it, have 'Peter' in the title or description have item type id with 5124 in it created by a user named 'peter' or a user whose id has 5124 in it created by a user with '5124' or 'peter' in his street address. How should i do the search? I read that the full-text search of MS-Sql is a lot more performant than a query with the LIKE keyword and i think the syntax is more clear, but i think it cant search on bigint(id) values and i read it has performance problems with indexing and therefore slows down inserts to the DB. In my project there will be more inserting than reading, so this could be a matter. Thanks in advance, Marks

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• Working Solo On Small Projects: Cowboy Coding The Way To Go?

  - by snicker

  I am a big advocate of agile methods when working on teams and/or large projects. However, I find that for smaller projects, when working solo, I usually start the project writing unit tests, documenting extensively, refactoring. As time wears on, I stop because I feel like I'm wasting time. I find that cowboy coding with an agile spin (testing often, writing human readable code) often works extremely well for me on small, solo projects that I don't expect others to have to work with. Do other people share my sentiment? Or do you think that one should never stick to their guns (get it? cowboys)? So the real question: Are there any agile methodologies that are particularly tailored to a solo project? (other than my "agile cowboy" method above)

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• Terminate on instance "std::runtime_error" Hiphop-Php

  - by boundless08

  I have successfully built Hiphop-Php on an ubuntu server 12.04 LTS but when I run the command: $HPHP_HOME/src/hphp/hphp test.php This error occurs: terminate called after throwing an instance of 'std::runtime_error' what(): locale::facet::_S_create_c_locale name not valid Aborted (core dumped) The same error occured during the make command but I used sudo make and it dealt with that, but using sudo on the above just removes the Aborted (core dumped). This is happening on a remote server, but I have done the exact same before testing on a VM. I even got root access, as I thought that could help, but it's done nothing. Just so you know I built with USE_HHVM=0, I need the code unreadable and the bytecode format does this, but the VM I built was as well, I'm just stumped! Thanks in advance.

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• Subversion for version control

  - by Gabriel Parenza

  Hi, I am working on an application whose primary purpose would be to provide source control management. My idea is to use to SVNKit for file check-out and check-in. However, while working with SVNKit, I realised it does not have the speed I was looking for. For instance, whenever developers create a ChangeRequest, which can encompass change in 3-40 files, I have to create a directory structure distributed across 32 folders. Doing so takes around 50 seconds, Another instance is that after creating change request developers can add files to the request. Copying even a single file from Trunk to branch takes around 6-7 secs. My question is has anyone had experience like this and what did you do to improve the performance? Moreover, is my approach correct? NOTE: I am using "http" protocol and can't use "svn" protocol.

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• Problem with setContentBorderThickness:forEdge: not actually setting the value

  - by jxpx777

  I'm trying to use setContentBorderThickness:forEdge: to create a bottom bar in a Cocoa application. mipadi was on to something, but in testing it out, I think maybe this is a slightly different problem: -(void) adjustContentBorderBasedOnArrayControllerSelection{ if(([[self.resultsArrayController selectionIndexes] count] == 0)){ [[self window] setContentBorderThickness:40.0f forEdge:CGRectMinYEdge]; NSLog(@"%f", [[self window] contentBorderThicknessForEdge:CGRectMinYEdge]); } else { [[self window] setContentBorderThickness:60.0f forEdge:CGRectMinYEdge]; NSLog(@"%f", [[self window] contentBorderThicknessForEdge:CGRectMinYEdge]); } } Both of those NSLog() messages show the thickness value is 0.0 even after I explicitly set it. Anyone know what's up with that?

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• How to estimate the thread context switching overhead?

  - by Ignas Limanauskas

  I am trying to improve the performance of the threaded application with real-time deadlines. It is running on Windows Mobile and written in C / C++. I have a suspicion that high frequency of thread switching might be causing tangible overhead, but can neither prove it or disprove it. As everybody knows, lack of proof is not a proof of opposite :). Thus my question is twofold: If exists at all, where can I find any actual measurements of the cost of switching thread context? Without spending time writing a test application, what are the ways to estimate the thread switching overhead in the existing application? Does anyone know a way to find out the number of context switches (on / off) for a given thread?

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• Simple way to use Foreign Key values for sorting?

  - by Brian Rizzo

  Disclaimer: I jumped to C# 2008 recently and SubSonic 3 (3.0.0.4) at the same time. I haven't used Linq for much of anything in the past. Is there an easy way to use the foreign key display value for sorting, rather than the FK Id (which is numeric)? I've added a new Find method in my ActiveRecord.tt to help with sorting based on a string field name but after doing some testing I realized that even though its working as it should be, I am not handling foreign key fields at all (they are just sorting by their value). Even if I need to change how I am accessing the data it is early enough in the project to do that. Just looking for suggestions.

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• How Can I Learn when to build my own Interfaces

  - by BDotA

  I am using C# and I know what are the interfaces and how syntatically use them,etc. but what I have not learned yet is that when I am tasked to write a project, create a component,... How should I learn better about interfaces so when I want to do something I be able to Think about using them in my design...or for example I want to learn about dependency injection or even using mocking objects for testing, these are all related to good understanding of interfaces and know when and how to use them ... Can you plase provide me some good advice, reading,... then can help me with that?

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• Android bluetooth socket error

  - by ashwini

  I am using backport bluetooth api on android 1.6. I am using Google Bluetooth Chat sample app for testing. The app works fine in normal scenarios. In a scenario, when I try to connect to paired device which is in off state, I get following error. 01-04 09:00:11.629: ERROR/BluetoothEventLoop.cpp(84): onGetRemoteServiceChannelResult: D-Bus error: org.bluez.Error.ConnectionAttemptFailed (Host is down) 01-04 09:00:11.729: DEBUG/dalvikvm(128): GC freed 4535 objects / 256008 bytes in 296ms 01-04 09:00:21.880: ERROR/bluetooth_RfcommSocket.cpp(1433): connect error: Host is down (112) But it sets the state as connected. The app is unable to catch the exception. Why does it happen? Or is it the case with backport api? Any help is appreciated as I am struggling a lot to get things run fine.

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• Amazon S3 collisions with heroku and paperclip

  - by poseid

  I have an app on my localhost for development and an app for testing on heroku. Image upload with localhost and paperclip always works. However, doing the same experiment with image upload on my heroku app, the app hangs... and the upload seems to be going on forever. I suspect that there is a collision going on. What is needed to get but uploads working? Or do I need to use different buckets for each environment?

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• Guaranteed COM object release?

  - by Jurily

  I wrote the following code under the assumption that Excel will die with Monkey: class ExcelMonkey { private static Excel.Application xl = new Excel.Application(); public static bool parse(string filename) { if (filename.Contains("foo")) { var workbook = xl.Workbooks.Open(filename); var sheet = workbook.Worksheets.get_Item(1); // do stuff return true; } return false; } } How do I make sure it does? Do I need to release workbook and sheet separately? I want to have Excel around for the lifetime of the program, it's a huge performance improvement.

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• TestCase scripting framework

  - by Mikey

  Hey guys, For our webapp testing environment we're currently using watin with a bunch of unit tests, and we're looking to move to selenium and use more frameworks. We're currently looking at Selenium2 + Gallio + Xunit.net, However one of the things we're really looking to get around is compiled testcases. Ideally we want testcases that can be edited in VS with intellisense, but don't require re-compilling the assembly every single time we make a small change, Are there any frameworks likely to help with this issue? Are there any nice UI tools to help manage massive ammount of testcases? Ideally we want the testcase writing process to be simple so that more testers can aid in writing them. cheers

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• Is Win32_PerfFormattedData_PerfDisk_PhysicalDisk missing from WMI in Vista?

  - by Martin

  From what I understand, the following script should work in Windows XP and higher, but it doesn't work for me in Vista Business 32-bit Service Pack 2. Thus far I have been very unsuccessful googling for information about this performance class. strComputer = "." Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2") Set colApps = objWMIService.ExecQuery("Select * from Win32_PerfFormattedData_PerfDisk_PhysicalDisk") For Each objApp in colApps Wscript.Echo objApp.Caption Next Does this WMI class simply not exist in Vista? If it is just me, is there a way to fix WMI? I have already tried running winmgmt /resetrepository and winmgmt /resyncperf and neither helps.

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• Php writing to file - empty ?

  - by The Devil

  Hey, I've been struggling with writing a single string into a file. I'm using just a simple code under Slackware 13: $fp = fopen('/my/absolute/path/data.txt', 'w'); fwrite($fp, 'just a testing string...'); fclose($fp); The file gets created (if it's not already created) but it's empty ?! The directory in which this file is written is owned by apache's user & group (daemon.daemon) and has 0777 permissions. This has never happened to me before. I'm curious what's the reason I'm not able to write inside the file ? Thanks in advance.

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• MySQL - are FK's useful / viable in a web app?

  - by yoda

  Hi all, I've encountered this discussion related to FK's and web applications. Basically some people say that FK's in web applications doesn't represent a real improvement and can even make the application slower in some cases. What do you guys think, what's your experience? -- A quote from Heikki Tuuri, creator of InnoDB engine, founder and CEO of Innobase: InnoDB checks foreign keys as soon as a row is updated, no batching is performed or checks delayed till transaction commit Foreign keys are often serious performance overhead, but help maintain data consistency Foreign Keys increase amount of row level locking done and can make it spread to a lot of tables besides the ones directly updated

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• Selecting pictures with Jquery and Javascript

  - by Axschech

  I'm testing out a layout on a website using 3 pictures here: Schechterbusiness.info the left button works, making it go through the pictures. But I can't figure out how to get the right button to work, which is supposed to scroll through the other way. I know there's probably a way to do it with arrays but I can't wrap my brain around it. Halp! Code to scroll through pictures: $('#fryLink').click(function() { $('#hide').hide(); $('#img').hide(); count++; if(count == 1) { $('#img').attr("src","images/fry.png"); } else if(count == 2) { $('#img').attr("src","images/bender.png"); } else if(count == 3) { $('#img').attr("src","images/zoidberg.png"); } $('#img').show("fade"); if(count > 2) { count = 0; }

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• I don't understand Application Domains

  - by Jeremy Edwards

  .NET has this concept of Application Domains which from what I understand can be used to load an assembly into memory. I've done some research on Application Domains as well as go to my local book store for some additional knowledge on this subject matter but it seems very scarce. All I know that I can do with Application Domains is to load assemblies in memory and I can unload them when I want. What are the capabilities other that I have mentioned of Application Domains? Do Threads respect Application Domains boundaries? Are there any drawbacks from loading Assemblies in different Application Domains other than the main Application Domains beyond performance of communication? Links to resources that discuss Application Domains would be nice as well. I've already checked out MSDN which doesn't have that much information about them.

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• Cannot find sleep function

  - by Tyzak

  hello, i'm new at C Programming (i learned c++) i want to create a process with windows.h at first i just want to start my main programm that creates a process ( -- starts an other programm) that's my code, but it doesn't really work, i removed every unnessasery line of code but "void sleep(700)" (or "sleep (700)" for testing if the windows methods work, but i get an error, that "sleep" cant be found. #include <iostream> #include <windows.h> #include <string> using namespace std; void main() { //bool ret; //startupinfo stupinfo; //prozess_information pro2info; //Getstartupinfo (&stupinfo); //createprozess(null, "C:\\bsss10\\betriebssystemePRA1.exe", null, null, false, create_new_console, null, // null, &stupinfo, &pro2info); sleep (700); cout<< "hello"; } thanks in advance

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• Google Analytics - async tracking with two accounts

  - by MatW

  I'm currently testing GAs new async code snippet using two different tracking codes on the same page; _gaq.push( ['_setAccount', 'UA-XXXXXXXX-1'], ['_trackPageview'], ['b._setAccount', 'UA-XXXXXXXX-2'], ['b._trackPageview'] ); Although both codes work, I've noticed that they present inconsistent results. Now, we aren't talking huge differences here, only 1 or 2 visits / day every now and then. However, this site is tiny and 1 or 2 visits equates to a 15% difference in figures. Now, the final site has much more traffic, but my concerns are; will this inconsistancy scale with traffic? assuming not, is a slight variation in recorded stats an accepted norm?

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• What are the pros and cons to keeping SQL in Stored Procs versus Code

  - by Guy

  What are the advantages/disadvantages of keeping SQL in your C# source code or in Stored Procs? I've been discussing this with a friend on an open source project that we're working on (C# ASP.NET Forum). At the moment, most of the database access is done by building the SQL inline in C# and calling to the SQL Server DB. So I'm trying to establish which, for this particular project, would be best. So far I have: Advantages for in Code: Easier to maintain - don't need to run a SQL script to update queries Easier to port to another DB - no procs to port Advantages for Stored Procs: Performance Security

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• Is AutoMapper able to auto resolve types base on existing maps

  - by Chi Chan

  I have the following code: [SetUp] public void SetMeUp() { Mapper.CreateMap<SourceObject, DestinationObject>(); } [Test] public void Testing() { var source = new SourceObject {Id = 123}; var destination1 = Mapper.Map<SourceObject, DestinationObject>(source); var destination2 = Mapper.Map<ObjectBase, ObjectBase>(source); //Works Assert.That(destination1.Id == source.Id); //Fails, gives the same object back Assert.That(destination2 is DestinationObject); } public class ObjectBase { public int Id { get; set; } } public class SourceObject : ObjectBase { } public class DestinationObject : ObjectBase { } So basically, I want AutoMapper to automatically resolve the destination type to "DestinationObject" based on the existing Maps set up in AutoMapper. Is there a way to achieve this?

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• "Access is denied" error on accessing iframe document object

  - by Ovesh

  For posting AJAX forms in a form with many parameters, I am using a solution of creating an iframe, posting the form to it by POST, and then accessing the iframe's content. specifically, I am accessing the content like this: $("some_iframe_id").get(0).contentWindow.document I tested it and it worked. On some of the pages, I started getting an "Access is denied" error. As far as I know, this shouldn't happen if the iframe is served from the same domain. I'm pretty sure it was working before. Anybody have a clue? If I'm not being clear enough: I'm posting to the same domain. So this is not a cross-domain request. I am testing on IE only. P.S. I can't use simple ajax POST queries (don't ask...)

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• Looking for collaboration tool/platform to synergize with my clients in all phases.

  - by Kabeer

  Hello. I am a consultant and will be working with geographically distant clients. I am looking for a solution to collaborate with my clients effectively in all the phases of the projects (architecture, requirements, design, construction, testing, deployment, maintenance). My hunt is for something in the open source (and preferably free) space and also on .Net platform. I need to record my communication with the clients and with growing no. of clients I should not miss out capturing any information. Please recommend.

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• Oracle: '= ANY()' vs. 'IN ()'

  - by eidylon

  Hi all, I just stumbled upon something in ORACLE SQL (not sure if it's in others), that I am curious about. I am asking here as a wiki, since it's hard to try to search symbols in google... I just found that when checking a value against a set of values you can do WHERE x = ANY (a, b, c) As opposed to the usual WHERE x IN (a, b, c) So I'm curious, what is the reasoning for these two syntaxes? Is one standard and one some oddball Oracle syntax? Or are they both standard? And is there a preference of one over the other for performance reasons, or ? Just curious what anyone can tell me about that '= ANY' syntax. CheerZ!

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