以很好的方式禁用的OpenMP [英] disable OpenMP in nice way

问题描述

我有C ++ code与OpenMP编译进去。我要测试的这款code既为多线程模式（使用OpenMP）和单线程模式（没有OpenMP的）。现在，在模式我需要评论的的#pragma OMP （或至少平行）。

什么是最干净的，或默认，方式启用/禁用OpenMP的？

解决方案

看看能否禁用OpenMP的交换机的编译器手册。对于GCC，OpenMP是默认禁用，并与-fopenmp选项启用。

另一种选择是运行code设置为1 OMP_NUM_THREADS环境变量，虽然这是不完全一样的摆在首位没有OpenMP的编译。

I have C++ code with OpenMP pragmas inside. I want to test this code both for multithread mode (with OpenMP) and in single thread mode (no OpenMP). For now, to switch between modes I need to comment #pragma omp (or at least parallel).

What is the cleanest, or default, way to enable / disable OpenMP?

解决方案

Look into the compiler manual for the switch that disables OpenMP. For GCC, OpenMP is disabled by default and enabled with the -fopenmp option.

Another option would be to run the code with the OMP_NUM_THREADS environment variable set to 1, though that is not exactly the same as compiling without OpenMP in the first place.

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