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  • Issues with time slicing

    - by user12331
    I was trying to see the effect of time slicing. And how it can consume significant amount of time. Actually, I was trying to divide a certain work into number of threads and see the effect. I have a two core processor. So two threads can run in parallel. I was trying to see if I have a work w that is done by 2 threads, and if I have the same work done by t threads with each thread doing w/t of the work. How much does time slicing play a role in it As time slicing is time consuming process, I was expecting that when I do the same work using a two thread process or by a t thread process, the amount of time taken by the t thread process will be more Any suggestions?

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  • 12.04 LTS usb wont boot

    - by Niva
    I've tried to install ubuntu 12.04 LTS parallel with Windows 8, on my laptop Clevo m767yu But when I try to boot from USB it just stops when it's trying to read the files. it stops and shows this picture: https://www.dropbox.com/s/np3ptvvmasv7ax2/IMAG0097.jpg If I try to boot from a cd, it stops and shows a cursor blinking. I've tried both usb and cd on other computers, and the both works. I've a little experience with Ubuntu, but I have never had problems with the installing process. Any help will be appreciated!

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  • What programming language matches this description? [on hold]

    - by Benubird
    I am looking for a functional language that is basically dynamic programming - i.e. one where functions are first-class objects - but where all function calls are asynchronous by default; i.e. you define function X(a,b) = (Y(a)+Z(b)), and when X() is called, it sees it is waiting for the return from two functions, runs one in the current thread, and spawns a new thread to run the other. The future is very much parallel processing; multiple cores, multiple machines, the internet of things, etc. and I was wondering if there was a language specifically designed to make this kind of parallelization easy. I currently have only used imperative languages (c, php, java, ruby, etc), so I don't know anything about what kind of functional languages are available.

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  • Lost in Code?

    - by Geertjan
    Sometimes you're coding and you find yourself forgetting your context. For example, look at this situation: The cursor is on line 52. Imagine you're coding there and you're puzzling on some problem for some time. Wouldn't it be handy to know, without scrolling up (and then back down again to where you were working), what the method signature looks like? And does the method begin two lines above the visible code or 10 lines? That information can now, in NetBeans iDE 7.3 (and already in the 7.3 Beta) very easily be ascertained, by putting the cursor on the closing brace of the code block: As you can see, a new vertical line is shown parallel to the line numbers, connecting the end of the method with its start, as well as, at the top of the editor, the complete method signature, together with the number of the line on which it's found. Very handy. Same support is found for other file types, such as in JavaScript files.

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  • Run two shell file with thread

    - by user1149157
    How i can run two file shell in parallel and do not shared the same jvm. may be i use thread but how i run two file shell bu two thread ? File 1: #!/bin/bash # # Script for running several experimentations one the same JVM # Usage : TRACE_DIR NB_EXPE Factories... # param="parameter1" another="parameter2" for ((i = 10; i >= 0; i -= 1)) do echo "run my file with param another " done File 2 : #!/bin/bash # # Script for running several experimentations one the same JVM # Usage : TRACE_DIR NB_EXPE Factories... # a="101" b="400" c="500" echo "run my programme with a b c "

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  • problem using getline with a unicode file

    - by hamishmcn
    UPDATE: Thank you to @Potatoswatter and @Jonathan Leffler for comments - rather embarrassingly I was caught out by the debugger tool tip not showing the value of a wstring correctly - however it still isn't quite working for me and I have updated the question below: If I have a small multibyte file I want to read into a string I use the following trick - I use getline with a delimeter of '\0' e.g. std::string contents_utf8; std::ifstream inf1("utf8.txt"); getline(inf1, contents_utf8, '\0'); This reads in the entire file including newlines. However if I try to do the same thing with a wide character file it doesn't work - my wstring only reads to the the first line. std::wstring contents_wide; std::wifstream inf2(L"ucs2-be.txt"); getline( inf2, contents_wide, wchar_t(0) ); //doesn't work For example my if unicode file contains the chars A and B seperated by CRLF, the hex looks like this: FE FF 00 41 00 0D 00 0A 00 42 Based on the fact that with a multibyte file getline with '\0' reads the entire file I believed that getline( inf2, contents_wide, wchar_t(0) ) should read in the entire unicode file. However it doesn't - with the example above my wide string would contain the following two wchar_ts: FF FF (If I remove the wchar_t(0) it reads in the first line as expected (ie FE FF 00 41 00 0D 00) Why doesn't wchar_t(0) work as a delimiting wchar_t of "00 00"? Thank you

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  • Convert MFC Doc/View to?

    - by Harvey
    My question will be hard to form, but to start: I have an MFC SDI app that I have worked on for an embarrassingly long time, that never seemed to fit the Doc/View architecture. I.e. there isn't anything useful in the Doc. It is multi-threaded and I need to do more with threading, etc. I dream about also porting it to Linux X Windows, but I know nothing about that programming environment as yet. Maybe Mac also. My question is where to go from here? I think I would like to convert from MFC Doc/View to straight Win API stuff with message loops and window procedures, etc. But the task seems to be huge. Does the Linux X Windows environment use a similar kind of message loop, window procedure architecture? Can I go part way? Like convert a little at a time without rendering my program unusable for long periods of work? What is the best book to read to help me to move in that direction.

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  • cgi.FieldStorage always empty - never returns POSTed form Data

    - by Dan Carlson
    This problem is probably embarrassingly simple. I'm trying to give python a spin. I thought a good way to start doing that would be to create a simple cgi script to process some form data and do some magic. My python script is executed properly by apache using mod_python, and will print out whatever I want it to print out. My only problem is that cgi.FieldStorage() is always empty. I've tried using both POST and GET. Each trial I fill out both form fields. <form action="pythonScript.py" method="POST" name="ARGH"> <input name="TaskName" type="text" /> <input name="TaskNumber" type="text" /> <input type="submit" /> </form> If I change the form to point to a perl script it reports the form data properly. The python page always gives me the same result: number of keys: 0 #!/usr/bin/python import cgi def index(req): pageContent = """<html><head><title>A page from""" pageContent += """Python</title></head><body>""" form = cgi.FieldStorage() keys = form.keys() keys.sort() pageContent += "<br />number of keys: "+str(len(keys)) for key in keys: pageContent += fieldStorage[ key ].value pageContent += """</body></html>""" return pageContent I'm using Python 2.5.2 and Apache/2.2.3. This is what's in my apache conf file (and my script is in /var/www/python): <Directory /var/www/python/> Options FollowSymLinks +ExecCGI Order allow,deny allow from all AddHandler mod_python .py PythonHandler mod_python.publisher </Directory>

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  • SQLite for personal use

    - by ALife
    What are the applications for your personal use that needs a small database like SQLite? I am thinking of trying a few popular databases and SQLite is surely the first one I am planning to try since I know barely nothing about database except some simple programming years ago. I learned that SQLite is good for personal use. But embarrassingly I do not see any application except maybe managing my list of phone numbers/contact info, which has probably a few hundred items. What's your experience? FYI, I use EndNote for my reference and softcopy of books, and I feel iTunes' music/media management is ok since I am not a frequent user anyway. And others? I do lots of coding, but I just use some simple etags tools for that. And I pretty much use .txt file (sometimes in the asciidoc style) for my notes. I have quite a bunch of notes, but not that many either. So, really, what are your personal applications that need a small database instead of existing tools and plain text files?

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  • How do I do a table join on two fields in my second table?

    - by Cannonade
    I have two tables: Messages - Amongst other things, has a to_id and a from_id field. People - Has a corresponding person_id I am trying to figure out how to do the following in a single linq query: Give me all messages that have been sent to and from person x (idself). I had a couple of cracks at this. Not quite right MsgPeople = (from p in db.people join m in db.messages on p.person_id equals m.from_id where (m.from_id == idself || m.to_id == idself) orderby p.name descending select p).Distinct(); This almost works, except I think it misses one case: "people who have never received a message, just sent one to me" How this works in my head So what I really need is something like: join m in db.messages on (p.people_id equals m.from_id or p.people_id equals m.to_id) Gets me a subset of the people I am after It seems you can't do that. I have tried a few other options, like doing two joins: MsgPeople = (from p in db.people join m in AllMessages on p.person_id equals m.from_id join m2 in AllMessages on p.person_id equals m2.to_id where (m2.from_id == idself || m.to_id == idself) orderby p.name descending select p).Distinct(); but this gives me a subset of the results I need, I guess something to do with the order the joins are resolved. My understanding of LINQ (and perhaps even database theory) is embarrassingly superficial and I look forward to having some light shed on my problem.

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  • Where do all the old programmers go?

    - by Tony Lambert
    I know some people move over to management and some die... but where do the rest go and why? One reason people change to management is that in some companies the "Programmer" career path is very short - you can get to be a senior programmer within a few years. Leaving no way to get more money but to become a manager. In other companies project managers and programmers are parallel career paths so your project manager can be your junior. Tony

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  • Multithreading improvements in .NET 4

    - by Artiom Chilaru
    I have heard that the .NET 4 team has added new classes in the framework that make working with threads better and easier. Basically the question is what are the new ways to run multithreaded tasks added in .NET 4 and what are they designed to be used for? UPD: Just to make it clear, I'm not looking for a single way of running parallel tasks in .NET 4, I want to find out which are the new ones added, and if possible what situation would each of them be best suited for..

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  • How to configure maximum number of transport channels in WCF using basicHttpBinding?

    - by Hemant
    Consider following code which is essentially a WCF host: [ServiceContract (Namespace = "http://www.mightycalc.com")] interface ICalculator { [OperationContract] int Add (int aNum1, int aNum2); } [ServiceBehavior (InstanceContextMode = InstanceContextMode.PerCall)] class Calculator: ICalculator { public int Add (int aNum1, int aNum2) { Thread.Sleep (2000); //Simulate a lengthy operation return aNum1 + aNum2; } } class Program { static void Main (string[] args) { try { using (var serviceHost = new ServiceHost (typeof (Calculator))) { var httpBinding = new BasicHttpBinding (BasicHttpSecurityMode.None); serviceHost.AddServiceEndpoint (typeof (ICalculator), httpBinding, "http://172.16.9.191:2221/calc"); serviceHost.Open (); Console.WriteLine ("Service is running. ENJOY!!!"); Console.WriteLine ("Type 'stop' and hit enter to stop the service."); Console.ReadLine (); if (serviceHost.State == CommunicationState.Opened) serviceHost.Close (); } } catch (Exception e) { Console.WriteLine (e); Console.ReadLine (); } } } Also the WCF client program is: class Program { static int COUNT = 0; static Timer timer = null; static void Main (string[] args) { var threads = new Thread[10]; for (int i = 0; i < threads.Length; i++) { threads[i] = new Thread (Calculate); threads[i].Start (null); } timer = new Timer (o => Console.WriteLine ("Count: {0}", COUNT), null, 1000, 1000); Console.ReadLine (); timer.Dispose (); } static void Calculate (object state) { var c = new CalculatorClient ("BasicHttpBinding_ICalculator"); c.Open (); while (true) { try { var sum = c.Add (2, 3); Interlocked.Increment (ref COUNT); } catch (Exception ex) { Console.WriteLine ("Error on thread {0}: {1}", Thread.CurrentThread.Name, ex.GetType ()); break; } } c.Close (); } } Basically, I am creating 10 proxy clients and then repeatedly calling Add service method. Now if I run both applications and observe opened TCP connections using netstat, I find that: If both client and server are running on same machine, number of tcp connections are equal to number of proxy objects. It means all requests are being served in parallel. Which is good. If I run server on a separate machine, I observed that maximum 2 TCP connections are opened regardless of the number of proxy objects I create. Only 2 requests run in parallel. It hurts the processing speed badly. If I switch to net.tcp binding, everything works fine (a separate TCP connection for each proxy object even if they are running on different machines). I am very confused and unable to make the basicHttpBinding use more TCP connections. I know it is a long question, but please help!

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  • Benefit of using multiple SIMD instruction sets simultaneously

    - by GenTiradentes
    I'm writing a highly parallel application that's multithreaded. I've already got an SSE accelerated thread class written. If I were to write an MMX accelerated thread class, then run both at the same time (one SSE thread and one MMX thread per core) would the performance improve noticeably? I would think that this setup would help hide memory latency, but I'd like to be sure before I start pouring time into it.

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  • Problems doing asynch operations in C# using Mutex.

    - by firoso
    I've tried this MANY ways, here is the current iteration. I think I've just implemented this all wrong. What I'm trying to accomplish is to treat this Asynch result in such a way that until it returns AND I finish with my add-thumbnail call, I will not request another call to imageProvider.BeginGetImage. To Clarify, my question is two-fold. Why does what I'm doing never seem to halt at my Mutex.WaitOne() call, and what is the proper way to handle this scenario? /// <summary> /// re-creates a list of thumbnails from a list of TreeElementViewModels (directories) /// </summary> /// <param name="list">the list of TreeElementViewModels to process</param> public void BeginLayout(List<AiTreeElementViewModel> list) { // *removed code for canceling and cleanup from previous calls* // Starts the processing of all folders in parallel. Task.Factory.StartNew(() => { thumbnailRequests = Parallel.ForEach<AiTreeElementViewModel>(list, options, ProcessFolder); }); } /// <summary> /// Processes a folder for all of it's image paths and loads them from disk. /// </summary> /// <param name="element">the tree element to process</param> private void ProcessFolder(AiTreeElementViewModel element) { try { var images = ImageCrawler.GetImagePaths(element.Path); AsyncCallback callback = AddThumbnail; foreach (var image in images) { Console.WriteLine("Attempting Enter"); synchMutex.WaitOne(); Console.WriteLine("Entered"); var result = imageProvider.BeginGetImage(callback, image); } } catch (Exception exc) { Console.WriteLine(exc.ToString()); // TODO: Do Something here. } } /// <summary> /// Adds a thumbnail to the Browser /// </summary> /// <param name="result">an async result used for retrieving state data from the load task.</param> private void AddThumbnail(IAsyncResult result) { lock (Thumbnails) { try { Stream image = imageProvider.EndGetImage(result); string filename = imageProvider.GetImageName(result); string imagePath = imageProvider.GetImagePath(result); var imageviewmodel = new AiImageThumbnailViewModel(image, filename, imagePath); thumbnailHash[imagePath] = imageviewmodel; HostInvoke(() => Thumbnails.Add(imageviewmodel)); UpdateChildZoom(); //synchMutex.ReleaseMutex(); Console.WriteLine("Exited"); } catch (Exception exc) { Console.WriteLine(exc.ToString()); // TODO: Do Something here. } } }

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  • How to include CKeditor which is outside of your document root

    - by Asif
    Hi, Is it possible to use CKeditor which resides outside of your document root inside document root application? For e.g. I am having directory structure like: My Documentroot C://xampp/htdocs/example.com My CKeditor is outside and parallel to document root say C://xampp/lib/ckeditor How can I call ckeditor.js which is in C://xampp/lib/ckeditor/ckeditor in my application page in C://xampp/htdocs/example.com/editor.php

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  • Connection Refused running multiple environments on Selenium Grid 1.04 via Ubuntu 9.04

    - by ReadyWater
    Hello, I'm writing a selenium grid test suite which is going to be run on a series of different machines. I wrote most of it on my macbook but have recently transfered it over to my work machine, which is running ubuntu 9.04. That's actually my first experience with a linux machine, so I may be missing something very simple (I have disabled the firewall though). I haven't been able to get the multienvironment thing working at all, and I've been trying and manual reviewing for a while. Any recommendations and help would be greatly, greatly appreciated! The error I'm getting when I run the test is: [java] FAILED CONFIGURATION: @BeforeMethod startFirstEnvironment("localhost", 4444, "*safari", "http://remoteURL:8080/tutor") [java] java.lang.RuntimeException: Could not start Selenium session: ERROR: Connection refused I thought it might be the mac refusing the connection, but using wireshark I determined that no connection attempt was made on the mac . Here's the code for setting up the session, which is where it seems to be dying @BeforeMethod(groups = {"default", "example"}, alwaysRun = true) @Parameters({"seleniumHost", "seleniumPort", "firstEnvironment", "webSite"}) protected void startFirstEnvironment(String seleniumHost, int seleniumPort, String firstEnvironment, String webSite) throws Exception { try{ startSeleniumSession(seleniumHost, seleniumPort, firstEnvironment, webSite); session().setTimeout(TIMEOUT); } finally { closeSeleniumSession(); } } @BeforeMethod(groups = {"default", "example"}, alwaysRun = true) @Parameters({"seleniumHost", "seleniumPort", "secondEnvironment", "webSite"}) protected void startSecondEnvironment(String seleniumHost, int seleniumPort, String secondEnvironment, String webSite) throws Exception { try{ startSeleniumSession(seleniumHost, seleniumPort, secondEnvironment, webSite); session().setTimeout(TIMEOUT); } finally { closeSeleniumSession(); } } and the accompanying build script used to run the test <target name="runMulti" depends="compile" description="Run Selenium tests in parallel (20 threads)"> <echo>${seleniumHost}</echo> <java classpathref="runtime.classpath" classname="org.testng.TestNG" failonerror="true"> <sysproperty key="java.security.policy" file="${rootdir}/lib/testng.policy"/> <sysproperty key="webSite" value="${webSite}" /> <sysproperty key="seleniumHost" value="${seleniumHost}" /> <sysproperty key="seleniumPort" value="${seleniumPort}" /> <sysproperty key="firstEnvironment" value="${firstEnvironment}" /> <sysproperty key="secondEnvironment" value="${secondEnvironment}" /> <arg value="-d" /> <arg value="${basedir}/target/reports" /> <arg value="-suitename" /> <arg value="Selenium Grid Java Sample Test Suite" /> <arg value="-parallel"/> <arg value="methods"/> <arg value="-threadcount"/> <arg value="15"/> <arg value="testng.xml"/> </java>

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  • Unexpected behavior of IntentService

    - by kknight
    I used IntentService in my code instead of Service because IntentService creates a thread for me in onHandleIntent(Intent intent), so I don't have to create a Thead myself in the code of my service. I expected that two intents to the same IntentSerivce will execute in parallel because a thread is generated in IntentService for each invent. But my code turned out that the two intents executed in sequential way. This is my IntentService code: public class UpdateService extends IntentService { public static final String TAG = "HelloTestIntentService"; public UpdateService() { super("News UpdateService"); } protected void onHandleIntent(Intent intent) { String userAction = intent .getStringExtra("userAction"); Log.v(TAG, "" + new Date() + ", In onHandleIntent for userAction = " + userAction + ", thread id = " + Thread.currentThread().getId()); if ("1".equals(userAction)) { try { Thread.sleep(20 * 1000); } catch (InterruptedException e) { Log.e(TAG, "error", e); } Log.v(TAG, "" + new Date() + ", This thread is waked up."); } } } And the code call the service is below: public class HelloTest extends Activity { //@Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Intent selectIntent = new Intent(this, UpdateService.class); selectIntent.putExtra("userAction", "1"); this.startService(selectIntent); selectIntent = new Intent(this, UpdateService.class); selectIntent.putExtra("userAction", "2"); this.startService(selectIntent); } } I saw this log message in the log: V/HelloTestIntentService( 848): Wed May 05 14:59:37 PDT 2010, In onHandleIntent for userAction = 1, thread id = 8 D/dalvikvm( 609): GC freed 941 objects / 55672 bytes in 99ms V/HelloTestIntentService( 848): Wed May 05 15:00:00 PDT 2010, This thread is waked up. V/HelloTestIntentService( 848): Wed May 05 15:00:00 PDT 2010, In onHandleIntent for userAction = 2, thread id = 8 I/ActivityManager( 568): Stopping service: com.example.android/.UpdateService The log shows that the second intent waited the first intent to finish and they are in the same thread. It there anything I misunderstood of IntentService. To make two service intents execute in parallel, do I have to replace IntentService with service and start a thread myself in the service code? Thanks.

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  • ErrorException [ Fatal Error ]: Class 'Controller' not found - Kohana 3.0.3 Error

    - by Asif
    Hi, I am (newbie) using Kohana V 3.0.3 and my directory structure is: pojectsys (kohana's system directory) parallel to htdocs directory C:\xampp\pojectsys and my application directory is in htdocs C:\xampp\htdocs\examples Inside C:\xampp\htdocs\examples\index.php, following variables have been set: $application = 'C:\xampp\htdocs\examples\application'; $system = 'C:\xampp\pojectsys'; Now when I am trying to execute http://lc.examples.com/ then Kohana returns error: ErrorException [ Fatal Error ]: Class 'Controller' not found for line 3 class Controller_Welcome extends Controller { Please help me to resolve this issue.

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  • Continuation - Viewing FIRST_ROWS before query completes.

    - by Frank Developer
    I have identified the query constructs my users normally use. would it make sense for me to create composite indexes to support those constructs and provide FIRST_ROWS capability? If I migrate from SE to IDS, I will loose the ability to write low-level functions with c-isam calls, but gain FIRST_ROWS along with other goodies like: SET-READS for index scans (onconfig USE_[KO]BATCHEDREAD), optimizer directives, parallel queries, etc?

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