英特尔® C++ Composer XE

sec_implicit_index

I've been trying to understand what the implicit_index intrinsic may be intended for.  It's tricky to get adequate performance from it, and apparently not possible in some of the more obvious contexts (unless the goal is only to get a positive vectorization report).

It seems to be competitive for the usage of setting up an identity matrix.

In the context of dividing its result by 2, different treatments are required on MIC and host:

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  • Less performance on 16 core than on 4 ?!

    Hi there,

    I evaluated my cilk application using "taskset -c 0-(x-1) MYPROGRAM) to analyze scaling behavior.

     

    I was very suprised to see, that the performances increases up to a number of cores but decreases afterwards.

    for 2 Cores, I gain a speedup of 1,85. for 4, I gain 3.15. for 8 4.34 - but with 12 cores the performance drops down
    to a speedup close to the speedup gained by 2 cores (1.99).
    16 cores performe slightly better (2.11)

    Exception when run project at debug mode using cilk_for

    Dear all,

    I have used cilk_plus to make parallel processing into my source code with visual studio 2008 IDE.

    But when I build it at debug mode, the project throw an exception below:

    "Run-Time Check Failure #0 - The value of ESP was not properly saved across a function call. This is usually a result of calling a function pointer declared with a different calling convention"

    How can  I resolve it to make debug mode operated ?

    Thanks of all,

    Tam Nguyen

     

    Cilk Tools error while loading shared libraries

    I have successfully compiled cilkplus for gcc (4.8 branch) on Ubuntu 14.04 LTS and compiled the example program fib on the cilkplus website.  I would like to run cilkview and cilkscreen on it, and so I downloaded cilk tools from the website as well.  However, when I try to run cilkview, I get the following error:

    Cilkview: Generating scalability data
    -t: error while loading shared libraries: -t: cannot open shared object file: No such file or directory
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