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    • intel和gnu编译器简单比较
    deepin Talks 1911 views · 0 replies ·
    Tofloor
    poster avatar
    fuyao
    deepin
    2018-03-25 21:56
    Author
    以前用gfortran和ifort编译同一个程序，印象中运算速度ifort要比gfortran快两倍以上，当时的gcc版本应该比较低，毕竟大部分高性能计算集群的操作系统都是centos。

    今天测试了c++程序，编译器版本都比较新，结果出乎意料，gcc要比icc的稍微快一些。


    Comparison between gcc and icc
    Cpu: E3-1231 v3
    System: deepin 15.5
    Gcc: gcc (Debian 6.4.0-2) 6.4.0 20170724
    Icc: icc (ICC) 18.0.1 20171018
    Test code: https://github.com/wphu/lizCode
    Test case: example/tst1d_simple
    Test command: mpiexec -n 5 liz data/input.py
    Run time unit: second
    gcc
    icc
    1
    56.2261
    57.5822
    2
    54.0172
    56.471
    3
    54.3229
    55.6649

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