prefetch keyword misnomer?

Dear forum,

Looking at the assembly code, the prefetch intrinsics function with _MM_HINT_T2 hint is compiled to vprefetch2, which, according to MIC instruction set manual, is a non-temporal L2 prefetch. This seems to contradict the temporal nature implied in "T". Or did I miss anything?

MIC Fortran Error : could not find 'k1om-mpss-linux-ld.exe'

I am using the 64 bit Intel Visual Fortran compiler through visual studio 2013 and Windows 7 professional and am encountering an error which prevents compilation. I stepped back to the beginning Xeon Phi labs and used the provided code as a simplest case which I knew should work and the error was still present (Code used included for reference).

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  • Intel Xeon Phi - MPI application


    I created simple "Hello world" apllication. I tried to run program, as show in this article:

    But in result I got following error:

    # bash: /opt/intel//impi/ cannot execute binary file

    I use system with HOME directory shared between host and card.

    What Is the problem? Thanks for help.


    open_hca: getaddr_netdev ERROR: Connection refused. Is ib0 configured ERROR

    Dear all,

    I am a beginner in linux; i am using quantum espresso software; The cluster we have at University has three types of partition short (for jobs within an hour), long (jobs within 4 days) and superlong (jobs within 10 days). each node has 8 processors; however recently when I am running a job, only the SHORT partition works properly; this is not very useful for me as I need to run longer jobs. when i run the other two (long and superlong) I get several errors: running on more than one node say : 16 processors (2 nodes) producesan error:

    No speedup with TBB and Cilk Plus sorting algorithms

    I cannot get any speedup with <b>TBB</b> and <b>Cilk Plus</b> sorting algorithms on Xeon Phi, namely <pre class="brush:cpp">tbb::parallel_sort()</pre>, <pre class="brush:cpp">cilkpub::cilk_sort_in_place()</pre>, and <pre class="brush:cpp">cilkpub::cilk_sort()</pre>. I have tried to use 2, 4, 16, 61, 122 threads. With the very same program, the speedups on the 16-core Xeon host are excellent. The compiler is the same (Intel 15.0.2), the only difference is the -mmic command line argument and linking against MIC libraries.

    _mm256_add_ps crashes program

    Hello ,

    I am using in my code something like:

    int x , y;
    float * TempD = (float*) _mm_malloc( N * sizeof(*TempD) ,64 );
    __m256  * SIMDTempD = (__m256*) TempD;
    __m256  * theX = (__m256*) X;
    __m256  * theY = (__m256*) Y;
    __m256i * theV = (__m256i*) V;
    __m256i * theVoronoi = (__m256i*) Vor;
    __m256 Xd ,Yd ,XdSquared ,YdSquared;


    and then in a loop:

    Illegal instruction using _mm512

    Hello ,

    I am using in my code intrinsics.

    If I compile like:

    icc -std=c99 -g -openmp -qopt-report=2 -o mycode mycode.c

    I am receiving : Illegal instruction in line:

    __m512 D = _mm512_set1_ps( FLT_MAX );


    If I compile :

    icc -std=c99 -g -mavx -openmp -qopt-report=2 -o mycode mycode.c

    I am receiving: Illegal instruction in line:

    Cluster-Computing abonnieren