Openmp线程关联性:在程序中设置2个线程，正在运行多少个内核? [英] Openmp thread affinity: Set 2 threads in the program, how many cores are running?

问题描述

我编写了一个Openmp程序，在两核计算机上运行它.

I wrote an Openmp Program, running it on a two core machine.

当我将线程号从1更改为2，并将线程号从2更改为4时，我无法获得2倍的速度.

When I changed the thread number from 1 to 2 and from 2 to 4, I couldn't get the 2x speed up.

2个线程到4个线程，即超线程.由于资源限制，超线程通常无法达到2倍的速度.

2 threads to 4 threads, that's the hyperthreads. Hyperthreads generally can't get 2x speed up because of resources limitation.

但是，从1个线程到2个线程，仍然无法达到2倍的速度，对此我感到困惑.我搜索并找到了CPU相似性概念，但是我不知道Openmp是如何工作的.

However, 1 threads to 2 threads, still can't get the 2x speed up, I feel confused about this.I searched and found the CPU affinity concept, but I can't figure out how Openmp works.

当我使用2个线程时，Openmp静态调度会将2个线程安排为1个内核还是2个内核?

When I use 2 threads, does Openmp static schedule arrange 2 threads into 1 core or 2 core?

omp_get_thread_num()函数不能告诉我答案，因为返回值为0或1，但我不知道它们是在1核还是2核上运行.

omp_get_thread_num() function can't tell me the answer since the return value is 0 or 1, but I don't know they are running on 1 core or 2.

感谢您的帮助.

推荐答案

可以与 proc_bind 使用线程相似性:

Can use thread affinity with proc_bind:

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大师

我希望这会帮助您选择合适的选项来工作.

I hope this will help you choose the appropriate option to work.

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