Parallel processing OpenMP任务-防止特定线程执行任务的方法？

我正在OpenMP中创建多个任务，但由于某些原因，这些任务由同一线程执行。该代码具有以下模式：

#pragma omp parallel num_threads(n_threads)

#pragma omp single 
while(!found){

            /.... operations with k, e, y, dist, u, step

            #pragma omp task firstprivate(k, e, y, dist, u, step)
            process(k, e, y, dist, u, step, h, out);

}

有没有办法强制OpenMP运行时系统将任务分配给除创建任务的线程外的所有线程

谢谢

编辑：

---

这和你在另一篇文章中的问题不一样吗

这里的答案是：不，您无法控制OpenMP实现如何将任务分配给并行团队的OpenMP线程

我可以建议您发布一段实际编译的代码吗？这样就更容易检查代码为什么没有按照您认为应该的方式运行

通过OP添加的示例代码，我的机器上的行为如下：

$> gcc -fopenmp omp.c
$> ./a.out
Thread 0 finished preprocessing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
$> gcc --version
gcc (SUSE Linux) 4.7.2 20130108 [gcc-4_7-branch revision 195012]
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$> icc -openmp omp.c
$> ./a.out
Thread 0 finished preprocessing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
mklemm-mobl2-vm:~/tmp [0]> icc -V
Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 14.0.1.106 Build 20131008
Copyright (C) 1985-2013 Intel Corporation.  All rights reserved.

你在用什么编译器

干杯，

---

-迈克尔

这不是完全相同的问题。我添加了我正在使用的代码的一个简单版本及其输出。它的编译应该没有问题。正如您所看到的，线程1正在执行每个任务，并且只有在计算完所有任务后才退出循环。我是这样编译的gcc-fopenmp-O2 test.c-o test.o。

Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 processing
Thread 1 finished preprocessing

$> gcc -fopenmp omp.c
$> ./a.out
Thread 0 finished preprocessing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
$> gcc --version
gcc (SUSE Linux) 4.7.2 20130108 [gcc-4_7-branch revision 195012]
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$> icc -openmp omp.c
$> ./a.out
Thread 0 finished preprocessing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
Thread 2 processing
Thread 1 processing
Thread 0 processing
Thread 3 processing
mklemm-mobl2-vm:~/tmp [0]> icc -V
Intel(R) C Intel(R) 64 Compiler XE for applications running on Intel(R) 64, Version 14.0.1.106 Build 20131008
Copyright (C) 1985-2013 Intel Corporation.  All rights reserved.