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  • Segmentation fault on MPI, runs properly on OpenMP

    - by Bellman
    Hi, I am trying to run a program on a computer cluster. The structure of the program is the following: PROGRAM something ... CALL subroutine1(...) ... END PROGRAM SUBROUTINE subroutine1(...) ... DO i=1,n CALL subroutine2(...) ENDDO ... END SUBROUTINE SUBROUTINE subroutine2(...) ... CALL subroutine3(...) CALL subroutine4(...) ... END SUBROUTINE The idea is to parallelize the loop that calls subroutine2. Main program basically only makes the call to subroutine1 and only its arguments are declared. I use two alternatives. On the one hand, I write OpenMP clauses arround the loop. On the other hand, I add an IF conditional branch arround the call and I use MPI to share the results. In the OpenMP case, I add CALL KMP_SET_STACKSIZE(402653184) at the beginning of the main program and I can run it with 8 threads on an 8 core machine. When I run it (on the same 8 core machine) with MPI (either using 8 or 1 processors) it crashes just when makes the call to subroutine3 with a segmentation fault (signal 11) error. If I comment subroutine4, then it doesn't crash (notice that it crashed just when calling subroutine3 and it works when commenting subroutine4). I compile with mpif90 using MPICH2 libraries and the following flags: -O3 -fpscomp logicals -openmp -threads -m64 -xS. The machine has EM64T architecture and I use a Debian Linux distribution. I set ulimit -s hard before running the program. Any ideas on what is going on? Has it something to do with stack size? Thanks in advance

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  • How to handle corrupt messages arriving on a socket?

    - by Pieter
    I've got a working socket handling mechanism, similar (but a bit more complex) to Qt's Fortune Example http://qt.nokia.com/doc/4.5/network-fortuneclient.html http://qt.nokia.com/doc/4.5/network-fortuneserver.html Now I'm wondering how to handle corrupt messages. Discarding the data is a start, but I need to discard up to a point I can start processing messages again. The corrupt message may be lost, but I need to be able to recover from it. I've got the following idea in mind: Put a fixed header at the start of each message, eg. 0xABCDEF01. When recovering, lookup this header and restart handling incoming messages. = Break off readFortune() on a timeout and recover = When encountering an inconsistent header, recover A huge blocksize is still going to be a problem. To fix that, I should be constantly checking whether or not I'm reading gibberish, but this is not always possible. I can also limit the blocksize on certain message-types. Any ideas on this? Any proposals on what to use as byteword?

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  • Fair Contract salary compared to permanent salary

    - by Ngu Soon Hui
    Let's say I have a position open, it can either be contract or permanent position. The question is what is the fair amount of money I should pay for the contract position, if I am willing to pay X per month for the permanent role? Contract pays are inevitably higher, because the contractors are not entitled for a lot of benefits, and not guaranteed of a job. I know the exact ratio of contract to permanent varies from person to person, but I need a rule of thumb here.

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  • Win XP / Win 7 Compatability

    - by Susan
    I run Win XP and my mother is getting a new PC with Win 7. We go remote quite frequently using Windows Messenger Remote Assistance. Will we still be able to do this when she gets the new PC?

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  • C# [Mono]: MPAPI vs MPI.NET vs ?

    - by Olexandr
    Hi. I'm working on college project. I have to develop distributed computing system. And i decided to do some research to make this task fun :) I've found MPAPI and MPI.NET libraries. Yes, they are .NET libraries(Mono, in my case). Why .NET ? I'm choosing between Ada, C++ and C# so to i've choosed C# because of lower development time. I have two goals: Simplicity; Performance; Cluster computing. So, what to choose - MPAPI or MPI.NET or something else ?

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  • multiply websites and different websites on the same iis server

    - by Krystian
    I have: Windows 2003 Server providing DNS. Server is hosting siteA.com I want to then add: Another website, siteB.com So far, I've created siteB.com on the server, but I'm unsure about how to correctly configure DNS for it. The public DNS administrator has mapped siteB.com as an alias of siteA.com. However, I don't know how to configure my local DNS server accordingly. I tried adding a local record for siteB, however it's shown up as siteB.SiteA.com Please help.

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  • Advantages of compilers for functional languages over compilers for imperative languages

    - by Onorio Catenacci
    As a follow up to this question What are the advantages of built-in immutability of F# over C#?--am I correct in assuming that the F# compiler can make certain optimizations knowing that it's dealing with largely immutable code? I mean even if a developer writes "Functional C#" the compiler wouldn't know all of the immutability that the developer had tried to code in so that it couldn't make the same optimizations, right? In general would the compiler of a functional language be able to make optimizations that would not be possible with an imperative language--even one written with as much immutability as possible?

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  • TightVNC and Vista yields "VNC server closed connection"

    - by Earlz
    I have forwarded the port 5900 for TightVNC. I have TightVNC 2.0 Beta4 installed on my Windows Vista machine. I then try to connect from an Arch Linux box: [earlz@earlzarch ~]$ vncviewer somehost::5900 Connected to RFB server, using protocol version 3.8 Performing standard VNC authentication Password: Authentication successful vncviewer: VNC server closed connection [earlz@earlzarch ~]$ vncviewer --help TightVNC Viewer version 1.3.10 What is wrong here? I thought that TightVNC 2.0 fixed the Vista bug with VNC servers? Is there any additional configuration I needed?

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  • Passive ftp on Server 2008

    - by xpda
    I have a new Windows 2008 server with IIS7. When I connect to the ftp in active mode, it works fine. In passive mode, it connects, but then times out trying to get the directory listing. I tried disabling both firewalls, but it didn't help. I've tried this with difference client machines and different ftp client software, with no change. Any ideas?

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  • Embedding icon in .exe with py2exe, visible in Vista?

    - by WindPower
    Hello, I've been trying to embed an icon (.ico) into my "compyled" .exe with py2exe. Py2Exe does have a way to embed an icon: windows=[{ 'script':'MyScript.py', 'icon_resources':[(1,'MyIcon.ico')] }] And that's what I am using. The icon shows up fine on Windows XP or lower, but doesn't show at all on Vista. I suppose this is because of the new Vista icon format, which can be in PNG format, up to 256x256 pixels. So, how can I get py2exe to embed them into my executable, without breaking the icons on Windows XP? I'm cool with doing it with an external utility rather than py2exe - I've tried this command-line utility to embed it, but it always corrupts my exe and truncates its size for some reason.

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  • Accidentally Removed Permissions for the XP SP3 Registry key HKEY_CLASSES_ROOT! Workaround Please!

    - by Praveen Kumar
    This is Praveen and I am using Microsoft Windows XP SP3 Build 2600. I had problems with using Microsoft Office 2010. It was keeping on saying, "Please wait while windows configures Microsoft Office Professional Plus 2010". After seeing this link: http://social.answers.microsoft.com/Forums/en-US/outlookcontact/thread/6e9c3f2e-010a-4b74-b433-0c41548ee468?prof=required I thought of giving the Registry Key: HKEY_CLASSES_ROOT, full access permissions for Everyone. I went to the registry, right-clicked on HKEY_CLASSES_ROOT and clicked on Permissions. I added Everyone and gave Full Control to the ACL and clicked on Apply. Also I checked "Replace permission entries on all child objects with entries shown here that apply to child objects." After a long time, it said with an error, cannot replace for few entries. Now, the key, HKEY_CLASSES_ROOT has no access to any user. My system is not starting up. Some of my friends asked me to try the Last Known Good Configuration. Even that did not work out. When I tried to open in the Safe Mode, I got only one driver to load and even that didn't load well. Another friend suggested me to put the Setup disk and reinstall the OS. I tried that and after completing the "Installing Device Drivers" part, when it started "Installing Network", the system is getting restarted. Now, the setup is also half way through and even if I open in Safe Mode to try System Restore, it popped up a message saying, "Setup cannot run under Safe Mode. Setup will restart now." and the system is restarting. All my official files and my software, which I developed for Registry Security, resides in my system now. I am unable to access the system and I want it to be working to submit the project, as the deadline is this week. I had no better solutions from elsewhere. Can anyone please help me out with this issue. If it is possible to open the registry editor's stored file from another system and restore the access permissions, I hope it would solve the problem. Please do help me. Thanking You, Praveen.

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  • Why aren't RemoteApp icons showing up

    - by Andy Schneider
    I have a Windows 2008 R2 server running RDS. I have installed and configured RemoteApp to publish applications with RDS Web Access. When I browse to https://servernname.domain.local/RDWeb I can log in and get to the RemoteApp Programs tab, but there are no icons or apps to click on. I have added a bunch of apps in Remote App manager and they are all enabled for RD Web Access. Also, I am an administrator on the server.

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  • Request time out error

    - by Neo
    Hi Today i came across strange problem whenever i try to pinging to my server works properly but whenever i send http request from browser the request time out happens. can anybody help me to resolve this issue.

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  • Force socket close

    - by Groo
    Is it possible to close an established socket connection in Windows "manually" (e.g. using a command prompt tool)? I have several open sockets connected to a listening server, I can see them using netstat, and would like to close one of them manually.

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  • How can I disable Lumension Sanctuary

    - by Mr. Flibble
    I'm an administrator on my computer but I can't work out how to uninstall/disable Lumension Sanctuary. There is no Uninstall button in the uninstall programs list. I've disabled the service (Sanctuary command and control) but it's had no effect. Any ideas? I'm on Windows XP BTW.

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  • Connect a PC to MAC OSX Server

    - by Paul Sheldrake
    I'm trying to connect to a server at work which is run on a Mac but I have a PC (windows 7) at home. I have path to connect in the format of afp://server.com/files. Is there a client that I need to install on my PC that I can use to login? Thanks, Paul

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  • Why is Excel 2010/2013 taking 10 seconds open any file?

    - by jbkly
    I have a fast Windows 7 PC with two SSDs and 16GB of RAM, so I'm used to programs loading very fast. But recently, for no reason I can figure out, Excel has started taking way too long to open Excel files (of any size--even blank files). This is occurring with Excel 2010 and with Excel 2013 after I upgraded, hoping to solve the problem. Here a couple scenarios: If I start Excel directly, it opens almost instantly. No problem there. If I start Excel directly, and then open any Excel file (.xls or .xlsx), it loads almost instantly. Still no problem BUT if I attempt to open any Excel file directly, with Excel not running, it consistently takes 10-11 seconds for Excel to start. I get no error messages, just a spinning cursor for 10-11 seconds, and then the file opens. During the delay while Excel is trying to start, I'm not really seeing any discernible spike in CPU or memory usage, other than explorer.exe. This problem is only occurring with Excel, not Word or any other program I'm aware of. I've searched around quite a bit on this question and found various others who have experienced it, but the solutions that worked for them are not working for me. For a few people it was a problem with scanning network drives, but my problem is purely with local files; I have no network drives, and the problem persists even with all network connections disabled. Some people suggested worksheets with corrupted formulas or links, but I'm experiencing this with ANY Excel file: even blank worksheets. Others thought it was a problem with add-ins, but I have all Excel add-ins disabled (as far as I can tell). One person solved it by disabling a "clipboard manager" process that was running in the background, but I don't have that. I've disabled as many startup and background processes as I can, but the problem persists. I've run malware scans, disk cleanup, CCleaner, and installed Excel 2013. I've deleted temporary files, enabled SuperFetch, and edited registry keys. Still can't get rid of the problem. Any ideas? My system details: Windows 7 Professional SP1 64-bit, Excel 2013 32-bit, 16GB RAM, all programs installed on SSD.

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  • Tools to partition dynamic disk

    - by rangalo
    Hi, I have a 1 TB hard-disk with windows 7 pre-installed. I would like to delete, resize some partition and create ext3/swap partitions to install linux. Which tools are available for this ? I tried gparted, it doesn't work.

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