6be53c6695
In commit v2.8.0~170 (ENH: Added ctest test options PROCESSORS and RUN_SERIAL, 2009-09-07) CTest learned to track the number of processors allocated to running tests in order to balance it against the desired level of parallelism. Extend this idea by introducing a new `PROCESSOR_AFFINITY` test property to ask that CTest run a test with the CPU affinity mask set. This will allow a set of tests that are running concurrently to use disjoint CPU resources.
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
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file Copyright.txt or https://cmake.org/licensing for details. */
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#include "cmAffinity.h"
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#include "cm_uv.h"
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#ifndef CMAKE_USE_SYSTEM_LIBUV
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#ifdef _WIN32
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#define CM_HAVE_CPU_AFFINITY
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#include <windows.h>
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#elif defined(__linux__) || defined(__FreeBSD__)
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#define CM_HAVE_CPU_AFFINITY
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#include <pthread.h>
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#include <sched.h>
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#if defined(__FreeBSD__)
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#include <pthread_np.h>
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#include <sys/cpuset.h>
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#include <sys/param.h>
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#endif
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#if defined(__linux__)
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typedef cpu_set_t cm_cpuset_t;
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#else
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typedef cpuset_t cm_cpuset_t;
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#endif
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#endif
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#endif
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namespace cmAffinity {
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std::set<size_t> GetProcessorsAvailable()
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{
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std::set<size_t> processorsAvailable;
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#ifdef CM_HAVE_CPU_AFFINITY
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int cpumask_size = uv_cpumask_size();
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if (cpumask_size > 0) {
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#ifdef _WIN32
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DWORD_PTR procmask;
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DWORD_PTR sysmask;
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if (GetProcessAffinityMask(GetCurrentProcess(), &procmask, &sysmask) !=
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0) {
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for (int i = 0; i < cpumask_size; ++i) {
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if (procmask & (((DWORD_PTR)1) << i)) {
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processorsAvailable.insert(i);
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}
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}
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}
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#else
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cm_cpuset_t cpuset;
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CPU_ZERO(&cpuset); // NOLINT(clang-tidy)
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if (pthread_getaffinity_np(pthread_self(), sizeof(cpuset), &cpuset) == 0) {
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for (int i = 0; i < cpumask_size; ++i) {
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if (CPU_ISSET(i, &cpuset)) {
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processorsAvailable.insert(i);
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}
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}
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}
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#endif
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}
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#endif
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return processorsAvailable;
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}
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}
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