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• Sun's JVM instruction speed table

  - by Pindatjuh

  Is there a benchmark available how much relative time each instruction costs in a single-thread, average-case scenario (either with or without JIT compiler), for the JVM (any version) by Sun? If there is not a benchmark already available, how can I get this information? E.g.: TIME iload_1 1 iadd 12 getfield 40 etc. Where getfield is equivalent to 40 iload_1 instructions.

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• Why is sys+user > real in "time command"?

  - by shadyabhi

  I have a program that uses pthread library to do the matrix multiplication of 500x500 matrix. Each thread calculates 50 rows of the matrix. When I run tiem command:- shadyabhi@shadyabhi-desktop:~$ time ./a.out real 0m0.383s user 0m0.810s sys 0m0.000s shadyabhi@shadyabhi-desktop:~$ How come sys+user is greater than real time?

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• Why wait should always be in synchronized block

  - by diy

  Hi gents, We all know that in order to invoke Object.wait() , this call must be placed in synchronized block,otherwise,IllegalMonitorStateException is thrown.But what's the reason for making this restriction?I know that wait() releases the monitor, but why do we need to explicitly acquire the monitor by making particular block synchronized and then release the monitor by calling wait() ? What is the potential damage if it was possible to invoke wait() outside synch block, retaining it's semantics - suspending the caller thread ? Thanks in advance

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• Swing and handling threads

  - by James P.

  There's a couple questions here on StackOverflow on the subject of threading with the Swing api but things still aren't clear. What is the issue with the EDT, what is the proper way to initiate a Thread with Swing and in what cases should it be used? P.S: Any sources in terms of good practises would be appreciated.

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• How to best use GCC with Visual Studio

  - by Oops

  I know this thread http://stackoverflow.com/questions/216025/gcc-with-visual-studio but to me it seems that everything mentioned there is rather outdated and it seems to be the tenor is: don't do it Who knows a better step by step explanation thank you in advance Oops

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• cuda device selection with multiple cpu threads.

  - by aaa

  Hello. Can you tell me how cuda runtime chooses GPU device if 2 or more host threads use cuda runtime? does the runtime choose separate GPU devices for each thread? does GPU device needs to be set explicitly? Thanks

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• is the Main method must needed in java Program?

  - by Praveen Chandrasekaran

  is the main method is must needed to write a java code. this my code : package example; public class HelloWorld { public HelloWorld() { } public String getHelloWorld() { return "Hello From Java!"; } } it shows error at compilation : java.lang.NoSuchMethodError: main Exception in thread "main"

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• Linq to SQL: how get row security between write access??

  - by Francisco

  I would like to allow two threads to write in a table at the same time (I know the problem of updating the same row, but this would be a story apart). I need that in behalf of speed up the operations in my aplication (one thread could write in row X while another could do the same in row X+n instead of waiting the first to finalize). So, can I block rows instead of tables with Linq to SQL? Thanks.

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• Power outage, Server 2K3 remains on "applying computer settings"

  - by syuroff

  My reward for clicking the "test" button in the APC UPS software was that it completely cut the power to my SQL server. The server promptly rebooted, the SQL service is running (verified by the app on another server that queries it), but the GUI has remained on "applying computer settings" for 20 minutes and counting, and it forbids RDC connections. Since SQL is up, it is fulfilling its key role, but it's obviously not right. What step to take next? Wait longer? Hardware is a Dell Poweredge 2850, internal RAID10.

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• Authenticated proxy in Windows command prompt

  - by tlvince

  My Internet access is delivered through an authenticated proxy. This is setup correctly in the "Internet Options" control panel applet and all browsing/GUI apps work fine. For cmd, proxy settings are typically set by exporting http_proxy. The applications I'm trying to use are git and Putty's pscp.exe. I've tried the following syntax to no avail: set http_proxy=http://username:[email protected]:port/ I've also experimented with Netsh.exe and ProxyCfg.exe with no luck. How does one configure an authenticated proxy in the Windows command prompt?

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• JSLint with Textmate

  - by mehdi

  I tried the instructions at this tutorial (http://www.phpied.com/jslint-on-mac-textmate/) to run jslint with textmate but getting stuck at step at the last step of "Step 1" Here is the error: Exception in thread "main" java.lang.NoClassDefFoundError: org/mozilla/javascript/tools/shell/Main Caused by: java.lang.ClassNotFoundException: org.mozilla.javascript.tools.shell.Main at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) Thanks

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• Scroll bar for vim(curses-based one, not gvim)?

  - by xiaq

  As a Linux user, I have been quite comfortable with CLI and TUI tools, but I miss the little scrollbar present in almost every GUI program. It has always been easier for me to know how long the file is and where I am from the scrollbar instead of "9752 lines, 24%". What I expect is a ASCII scrollbar that looks like | | | | # # # | | | and I can configure to appear on the left or right (and if on the left, the relative position to line numbers and fold marks). Is there already a Vim plugin to do this, or how can I write my own one? Vim's plugin framework doesn't seem to support such UI modifications directly.

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• When deploying python, what web server options do we have? is the process inefficient at all?

  - by Blankman

  I think in the past python scripts would run off CGI, which would create a new thread for each process. I am a newbie so I'm not really sure, what options do we have? Is the web server pipeline that python works under any more/less effecient than say php?

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• VirtualBox VRDP server doesn't start on Windows

  - by quanticle

  I've installed VirtualBox 4.1.8 on a Windows 7 Ultimate host system. I've set up an Arch Linux VM that starts just fine from the VirtualBox GUI. However, when I try to start it with VBoxHeadless --startvm <vm_name> it prints the following Oracle VM VirtualBox Headless Interface 4.1.6 (C) 2008-2011 Oracle Corporation All rights reserved. and then it just sits there. I never get the VRDE server is listening on port 3389 message like when I start a headless VM on a Linux machine. Do I have to configure anything else in order to get the VRDE server to run?

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• What are the major distinctions between PureDarwin and FreeBSD?

  - by ??????? ???????????

  I'm looking to install a different unix on my workstation to acquire some perspective on GNU/Linux and out of curiosity. I have narrowed my options down to these two. The reason for considering PureDarwin is because I have very little experience with Apple's products. So my question is will installing and using PureDarwin give me a closer understanding of OSX than would running FreeBSD? What I have in mind are day to day routines like adding users, installing software and configuring various aspects of the underlying OS. I know that the GUI of OSX would not be available, but that is not a concern. As a secondary, less important question, can I buy OS X in the apple store and run it in a virtual machine or does that violate their EULA?

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• Delphi - Is there any equivalent to C# lock?

  - by CaldonCZE

  I'm writing a multi-threaded application in Delphi and need to use something to protect shared resources. In C# I'd use the "lock" keyword: private someMethod() { lock(mySharedObj) { //...do something with mySharedObj } } In Delphi I couldn't find anything similar, I found just TThread.Synchronize(someMethod) method, which prevents potential conflicts by calling someMethod in main VCL thread, but it isn't exactly what I want to do.... Edit: I'm using Delphi 6

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• How can I delete Time Machine files using the commandline

  - by Tim

  I want to delete some files/directories from my Time Machine Partition using rm, but am unable to do so. I'm pretty sure the problem is related to some sort of access control extended attributes on files in the backup, but do not know how to override/disable them in order to get rm to work. An example of the error I'm getting is: % sudo rm -rf Backups.backupdb/MacBook/Latest/MacBook/somedir rm: Backups.backupdb/MacBook/Latest/MacBook/somedir: Directory not empty rm: Backups.backupdb/MacBook/Latest/MacBook/somedir/somefile: Operation not permitted There are a number of reasons I do not want to use either the Time Machine GUI or Finder for this. If possible, I'd like to be able to maintain the extended protection for all other files (I'd like not to disable them globally, unless I can re-enable once I've done my work).

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• Yum through http proxy

  - by eodchop

  I have several Fedora 13 servers that have to connect through an http proxy for yum updates. All port 80 traffic has to be routed through this proxy. I have setup the proxy server in the network settings GUI. I can browse the internet just fine. I have also setup my proxy information in /etc/yum.conf as follows: proxy=http:proxy.largecorp.corp/accelerated_pac_base.pac proxy_user=user proxy_password=password I then added the export HTTP_PROXY="http:proxy.largecorp.corp/accelerated_pac_base.pac" to /etc/bashrc and sourced the file. When i run yum update: Loaded plugins:presto, refresh-packagekit Error: Cannot retrieve repository metadata (repomd.xml) fro repository: fedora. Please verify its path and try again. All of the repo urls are the defaults, as this is a fresh install.

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• Interconnecting Emulator Instances Android

  - by blah01

  Hi all I want to communicate two emulators via DatagramSocket in Android. Each of them is a Node in a P2P system. Thus each of them has a server Thread and client Thread (created per GUI event). This is how I create server public static final String SERVERIP = "10.0.2.15"; //... run() { InetAddress serverAddr = InetAddress.getByName(SERVERIP); DatagramSocket socket = new DatagramSocket(SERVERPORT,serverAddr); while(true) { byte[] buf = new byte[29]; DatagramPacket packet = new DatagramPacket(buf, buf.length); socket.receive(packet); //... } } The port is given by the user during initializing application. The client part (requesting some data) InetAddress serverAddr = InetAddress.getByName("10.0.2.2"); //... Log.i("Requester", "Trying to connect to device port = "+target); DatagramSocket socketJ = new DatagramSocket(); byte[] bufJ = Adaptor.createStringMsg(Adaptor.createJoingMsg(id, Location.getX(), Location.getY())).getBytes(); DatagramPacket packetJ = new DatagramPacket(bufJ, bufJ.length, serverAddr, target); Log.i("Requester", "Sending: '" + new String(bufJ) + "'"); socketJ.send(packetJ); Log.i("Requester", "Done."); Some additional info. The Node1 (emulatorA) has a server on port 8000 and Node2 (emulatorB) has a server on port 8001. The target port for "client part" is read properly. What tried to do is to set the redirection as such: //emulatorA redir add tcp:8000:8000 //emulatorB redir add tcp:8001:8001 However I can not get any communication beetwen those 2 emulators. As far as I understood the android tutorial about it should work like this redir add tcp:localhostPort:emulatorPort. I'm stuck with it :/. Can anyone point me the mistake or give some good advice. For the record while I was testing communication on a single device (client faking other node) everything worked, so I don't think there is a bug in the code. Btw does any one knows how can I get 2 set of logs for those 2 emulators (logA, logB)? It would help me a lot.

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• Perfect Forwarding to async lambda

  - by Alexander Kondratskiy

  I have a function template, where I want to do perfect forwarding into a lambda that I run on another thread. Here is a minimal test case which you can directly compile: #include <thread> #include <future> #include <utility> #include <iostream> #include <vector> /** * Function template that does perfect forwarding to a lambda inside an * async call (or at least tries to). I want both instantiations of the * function to work (one for lvalue references T&, and rvalue reference T&&). * However, I cannot get the code to compile when calling it with an lvalue. * See main() below. */ template <typename T> std::string accessValueAsync(T&& obj) { std::future<std::string> fut = std::async(std::launch::async, [](T&& vec) mutable { return vec[0]; }, std::forward<T>(obj)); return fut.get(); } int main(int argc, char const *argv[]) { std::vector<std::string> lvalue{"Testing"}; // calling with what I assume is an lvalue reference does NOT compile std::cout << accessValueAsync(lvalue) << std::endl; // calling with rvalue reference compiles std::cout << accessValueAsync(std::move(lvalue)) << std::endl; // I want both to compile. return 0; } For the non-compiling case, here is the last line of the error message which is intelligible: main.cpp|13 col 29| note: no known conversion for argument 1 from ‘std::vector<std::basic_string<char> >’ to ‘std::vector<std::basic_string<char> >&’ I have a feeling it may have something to do with how T&& is deduced, but I can't pinpoint the exact point of failure and fix it. Any suggestions? Thank you! EDIT: I am using gcc 4.7.0 just in case this could be a compiler issue (probably not)

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• Best way to laod a large file into arraylist in java

  - by user1730833

  I have a file whose size is about 300mb i want to read the contents line by line and then add it into arraylist. So i have made an object of array list a1 , then reading the file using bufferedreader , after that when i add the lines from file into arraylist it gives an error Exception in thread "main" java.lang.OutOfMemoryError: Java heap space. Please tell me what should be the solution for this.

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• STL container to pop() by priority?

  - by Pirate for Profit

  I'm writing a thread-pool for Qt as QRunnable doesn't handle event loops in new threads. Not too familiar with STL, what would be the best way to pop() something by priority? Priority should probably be a property of MyRunnable imo, but I can always give that info to an STL container when adding the runnable to the queue.

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• How to get the name of global active window using Java??

  - by Ansh J

  I am work an Desktop Application in which i need to save the name of corrently focused or active window name(mozilla firefox, or any other file name) in an text file currently I am using getActiveWindow() method of KeyboardFocusManager which give the name of active Window, or null if the active Window is not a member of the calling thread's context. I want to get the name of Global Active window which corrently user is using. Thanks Ansh J Thanks in advance

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• Most interesting library you have seen lately

  - by acidzombie24

  What is the most interesting library you have seen lately? In April i was watching a video online where the intel guys explained a little about Thread Building Blocks (which is also open source!) and i thought it was cool http://www.threadingbuildingblocks.org/

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• Threading heap and stack

  - by DJ

  How memory is allocated in case of spawning a new thread, i.e how memory heap, memory stack, and threads are related? I know this is fundamental (.net framework concept) but somehow I am not much aware of this concept.

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