In the OMP Runtime we have a helper thread. My customers are asking where this thread is bound (or is it bound?) when using KMP_AFFINITY and a proclist. To make it simple, assume the proclist is 1,2,3,4. And OMP_NUM_THREADS=4. Pretty obvious where the worker threads get bound. What about the helper? Empirically on a HSW Cray XC-40 the customer is reporting seeing the helper bound to proc 2. Which surprised me. I would have thought proc 1. OR is it that the helper doesn't bind and floats within the proclist?
The Intel’s next generation Xeon Phi™ processor family x200 product (code-name Knights Landing) brings in several new technological solutions: socket form-factor (stand-alone CPU), as well as coprocessor version; a high bandwidth on package memory called Multi-Channel DRAM (MCDRAM) in addition to the traditional DDR4, which leads to three modes of MCDRAM operation - cache, flat, and hybrid; optional integrated high-speed fabric;
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I am trying to see (print out) the status of a waiting thread after setting up the OMP_WAIT_POLICY environment variables.
For example, I am setting the OMP_WAIT_POLICY = passive but I want to show that the waiting threads are in passive mode.
Thanks in advance.
I am trying to find out where the implementation of omp_get_thread_num function is. I looked at several files such as kmp_csupport.c kmp_runtime.c but I have not found it.
Thanks in advance for your help.
We are excited to announce the next release of the Intel® OpenMP* Runtime Library at openmprtl.org. This release aligns with Intel® Parallel Studio XE 2016 Composer Edition Update 3.
- OpenMP* 4.5 schedule(simd:static) support
- Hwloc topology discovery improved
- Spin backoff mechanism fixed in lock code
- Plain barrier performance improved on Intel® Xeon Phi™ coprocessor
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I am trying to destroy(shutdown) the threads created by parallel directive after exiting the parallel region. Right now, the threads are put to "sleep".
Is there any way to do that? If not, could someone please help me to do it?