有关PGI的OpenMP目标指令的结果 [英] Results of OpenMP target directives on PGI

问题描述

我正在使用PGI编译以下程序，该程序使用OpenMP的target指令将工作卸载到GPU:

I'm using PGI to compile the following program which uses OpenMP's target directives to offload work to a GPU:

#include <iostream>
#include <cmath>

int main(){
  const int SIZE = 400000;

  double *m;
  m = new double[SIZE];

  #pragma omp target teams distribute parallel for
  for(int i=0;i<SIZE;i++)
    m[i] = std::sin((double)i);

  for(int i=0;i<SIZE;i++)
    std::cout<<m[i]<<"\n";
}

我的编译字符串如下:

pgc++ -omp -ta=tesla,pinned,cc60 -Minfo=accel  -fast test2.cpp

编译成功，但是缺少我通过OpenACC获得的一系列输出，这些输出告诉我编译器实际上如何使用指令进行操作，像这样:

Compilation succeeds, but it lacks the series of outputs that I get with OpenACC that tell me what the compiler actually did with the directive, like so:

main:
  8, Accelerator kernel generated
     Generating Tesla code
     11, #pragma acc loop gang, vector(128) /* blockIdx.x threadIdx.x */
  8, Generating implicit copyout(m[:400000])

我如何获得有关OpenMP的类似信息? -Minfo本身似乎没有产生任何有用的作用.

How can I get similar information for OpenMP? -Minfo by itself didn't seem to yield anything useful.

推荐答案

-Minfo"(与"-Minfo = all"相同)或"-Minfo = mp"将为您提供OpenMP的编译器反馈消息汇编.

"-Minfo" (which is the same as "-Minfo=all"), or "-Minfo=mp" will give you compiler feedback messages for OpenMP compilation.

尽管如此，PGI仅在我们的LLVM后端编译器中支持OpenMP 4.5指令.这些是默认在基于IBM Power的系统上可用的，或者是x86上的LLVM beta编译器的一部分.可以在 http://www.pgroup.com/support/download_llvm中找到x86 beta编译器. php ，但需要获得专业版许可证.

Though, PGI only supports OpenMP 4.5 directives with our LLVM back-end compilers. These are available by default on IBM Power based systems or as a part of our LLVM beta compilers on x86. The x86 beta compilers can be found at http://www.pgroup.com/support/download_llvm.php but do require a Professional Edition license.

此外，我们当前的OpenMP 4.5仅针对多核CPU.我们也在进行GPU目标卸载，但是这种支持将在一段时间内不可用.

Also, our current OpenMP 4.5 only targets multicore CPU. We're working on GPU target offload as well but this support wont be available for awhile.

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