可以命名OpenMP Worker-threads吗？
使用TOP，我可以看到我的应用程序工作 - 并按照预期消耗多个CPU。但是，我希望能够通过不同的工人深入到CPU消费中，但是，这些在Top的输出中是难以置信的，它显示了所有这些名称：myProgram {myProgram {myProgram} < /代码>。
是否有OpenMP子句允许每个工人命名？如果没有，也许其他一些技巧 - 使用pthread_setname_np（）也许 - 哪些将在所有（或大多数）平台上使用？
update ：我尝试使用pthread_setname_np（）和AM观察意外结果：多个带有同名的线程...我的程序使用嵌套并行化：
＃＃＃的Pragma OMP Parallel正在调用一个函数来上传文件 - 多个此类上传并行运行。上传- 功能循环在给定文件上，一次读取一个块。然后，每个块是：
- 馈送到
sha256_update（） - fed to
sftp_write（）
该想法是计算每个文件的摘要，而该文件无论如何都通过RAM。摘要更新和写作是并行完成的：
#pragma omp parallel sections
{
#pragma omp section
{
char tname[32];
sprintf(tname, sizeof tname, "SHA %d", omp_get_thread_num());
pthread_setname_np(pthread_self(), tname));
SHA256_Update(&ctx, buf);
pthread_setname_np(pthread_self(), ""));
}
#pragma omp section
{
char tname[32];
sprintf(tname, sizeof tname, "SFTP %d", omp_get_thread_num());
pthread_setname_np(pthread_self(), tname));
written = sftp_write(sftp, buf, bufsize);
pthread_setname_np(pthread_self(), ""));
}
}
我在顶部和GDB中看到的奇怪的是几个名为“ SFTP 1”的线程。 有时 一个名称“ sha 1”闪烁，但从来没有其他数字，即使我看到7个文件并行上传...
Using top, I can see my application working -- and consuming multiple CPUs, as expected. However, I'd like to be able to drill down into the CPU-consumption by the different workers, and yet, these are indiscernible in top's output, which shows the same name for all of them: myprogram{myprogram}.
Is there an OpenMP clause allowing to name each worker? If not, perhaps some other tricks -- using the pthread_setname_np(), perhaps -- which will work on all (or most) platforms?
Update: I tried using the pthread_setname_np() and am observing unexpected results: multiple threads running with the same name... My program uses nested parallelization:
- The
#pragma omp parallel foris calling a function to upload a file -- multiple such uploads are running in parallel. - The
upload-function loops over the given file, reading a block at a time. Each block is then:
- fed to
SHA256_Update() - fed to
sftp_write()
The idea is to compute each file's digest, while the file is passing through the RAM anyway. The digest-update and the writing are done in parallel:
#pragma omp parallel sections
{
#pragma omp section
{
char tname[32];
sprintf(tname, sizeof tname, "SHA %d", omp_get_thread_num());
pthread_setname_np(pthread_self(), tname));
SHA256_Update(&ctx, buf);
pthread_setname_np(pthread_self(), ""));
}
#pragma omp section
{
char tname[32];
sprintf(tname, sizeof tname, "SFTP %d", omp_get_thread_num());
pthread_setname_np(pthread_self(), tname));
written = sftp_write(sftp, buf, bufsize);
pthread_setname_np(pthread_self(), ""));
}
}
Bizarrely, what I see in top -- and in gdb -- are several threads named "SFTP 1". Sometimes a name "SHA 1" flashes by, but never any other number, even though I see 7 files being uploaded in parallel...
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没有标准方法可以在OpenMP中设置线程名称（假设我正确读取了规范）。您可以在规范中检查： https”> https：> https： //www.openmp.org/wp-content/uploads/openmp-api-specification-5-2.pdf 。
如果您的OpenMP运行时使用PTHREAD（通常在Linux和BSD上，但肯定在Windows上），则可以使用函数
pthread_sers在并行部分中获取线程上下文。然后，您可以使用函数pthread_setname_np。但是，请不要说该功能的论点会更改所使用的操作系统。请参阅如何在中设置线程名称linux pthreads？。简而言之，没有便携式解决方案。There is no standard way to set a thread name in OpenMP (assuming I read the specification correctly). You can check that in the specification: https://www.openmp.org/wp-content/uploads/OpenMP-API-Specification-5-2.pdf .
If your OpenMP runtime use pthread (typically on Linux and BSD but certainly not on Windows), then you can use the function
pthread_selfto get the thread context in a parallel section. Then you can use the functionpthread_setname_np. However, please not that the argument of the function change regarding the OS used. See How to set the name of a thread in Linux pthreads? . Put it shortly, there is no portable solution.