Parallel Computing

Intel® Inspector Glossary

Intel® Inspector is a dynamic memory and threading error checking tool for users developing serial and multithreaded applications on Windows* and Linux* operating systems.This page defines key terminology used in the product.
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  • Parallel Computing
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  • bug: warning #469 is hidden when function overloaded

    Hello,

    When compiling example below, you will get warning:

    #469: temporary used for initial value of reference to non-const (anachronism)

    and when another overload is added (see comment) warning disappears, but compiler still choose "BOOL" overload instead of "OBJECT". Note that disabling microsoft extensions (/Za) brings warning back.

    We are using x64 compiler for visual studio 2013, version 15.0.1.148 build 20141023 on windows 7. 

    dpotrf arguments

    With the help of this great forum and old post, I was able to finally execute my first example on Cholesky factorization. However, I have a question. I call the function like this:

      dpotrf(
            &'L',
            &N, // A is NxN matrix
            A,
            &N,
            &nInfo
      );
    

    Since I am planning to do a distributed factorization, I have to be sure about the arguments. What is the latter 'N' used for? My first thought was about the dimension of the output, but that's the same array, so I am confused.

    inspxe-inject not creating specification file

    I'm running the command inspxe-inject -save-spec=file.spec -- make all

    The program runs (very quickly) with no error messages.

    When I look in file.spec this is all I see:

    # DO NOT EDIT THIS FILE!!!

    #Source Checker Build Specification Format, version 1.0.0

     

    When I run "make all" from the same directory, it runs correctly.

    The make files are being created by cmake, and at this time I do not have the ability to modify them.

     

    I am using Centos-7 Linux.

     

     

    31S1P: BSOD or Device Connection Lost

    31S1P: BSOD or Device Connection Lost

    Hi.

    There are some kind of instabilities with my Xeon Phi 31s1p. With or WITHOUT(!) a job on the coprocessor there are events like

    june 16 2015 21:02:31: Warning: mic0: Device connection lost!
    june 16 2015 21:03:47: Information: mic0: Device connection restored

     

    With an OpenCL job the situation gets worse: it may loose connection or raise blue screen of death :) IRQL_LESS_OR_EQUAL in some MPSS dll (I will take a screenshot later).

    CMP AVX intrinsic (_mm256_cmp_pd)

    Hey everyone 

    I'm testing some intrinsics and checking some results. Unfortunately, I don't understand why when I'm trying to evaluate a[i] > 2, I get "-nan" as an output for the true cases. Maybe I did something wrong but I thought this should return 1 when it's true and 0 when it's false. I looked other internet for this error but I didn't find anything.

     

    Here's my code:

    Data alignment problem

    Hi there

    I was trying to offload some computation to MIC using "pragma", sending data addressed by a pointer p, then how to ensure the alignment of data on MIC after MIC recieved it? Does" __assume(p, 64)" work?I was trying to use instrinsics to load data to the vector RF, which requires the alignment of data.

    Another problem, that I was trying to active lots of threads for the calculation using "#pragma omp parallel for", and some arrays inside the loop must be thread private while also 64-byte aligned.

    MPI_Recv block a long time

    hello:
        I get into trouble when use MPI_Recv in my programmes. 
        My programme start 3 subprocess,and bind them to cpu 1-3 respectively. In each subprocess, first disabled interrupts , then send message to other process and receive from others. Repeat it a billion times.
        I except that MPI_Recv will return in a fixed times ,and not use MPI_irecv instead.
        In order to do that, i disabled interrupts and cancel ticks on cpu1-3,remove other process from cpu 1-3 to cpu 0,and bind interrupts to cpu0.

    Run MPI job on LSF for Windows

    When I ran a MPI job on Linux using LSF, I just use bsub to submit the following script file and 

    #!/bin/bash
    #BSUB -n 8
    #BSUB -R "OSNAME==Linux && ( SPEED>=2500 ) && ( OSREL==EE60 || OSREL==EE58 || OSREL==EE63 ) &&
    SFIARCH==OPT64 && mem>=32000"
    #BSUB -q lnx64
    #BSUB -W 1:40
    cd my_working_directory
    mpirun  mympi

    The system will start 8 mympi jobs.  I don't need to specify machine names in the mpirun command line. 

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