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38 * Implements functions from gmxomp.h.
40 * \ingroup module_utility
55 #include "gromacs/utility/basedefinitions.h"
56 #include "gromacs/utility/cstringutil.h"
57 #include "gromacs/utility/exceptions.h"
58 #include "gromacs/utility/fatalerror.h"
59 #include "gromacs/utility/programcontext.h"
60 #include "gromacs/utility/stringutil.h"
62 int gmx_omp_get_max_threads()
65 return omp_get_max_threads();
71 int gmx_omp_get_num_procs()
74 return omp_get_num_procs();
80 int gmx_omp_get_thread_num()
83 return omp_get_thread_num();
89 void gmx_omp_set_num_threads(int num_threads)
92 omp_set_num_threads(num_threads);
94 GMX_UNUSED_VALUE(num_threads);
98 bool gmx_omp_check_thread_affinity(char** message)
100 bool shouldSetAffinity = true;
104 /* We assume that the affinity setting is available on all platforms
105 * gcc supports. Even if this is not the case (e.g. Mac OS) the user
106 * will only get a warning. */
107 # if defined(__GNUC__)
108 const char* programName;
111 programName = gmx::getProgramContext().displayName();
113 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
115 const char* const gomp_env = getenv("GOMP_CPU_AFFINITY");
116 const bool bGompCpuAffinitySet = (gomp_env != nullptr);
118 /* turn off internal pinning if GOMP_CPU_AFFINITY is set & non-empty */
119 if (bGompCpuAffinitySet && *gomp_env != '\0')
123 std::string buf = gmx::formatString(
124 "NOTE: GOMP_CPU_AFFINITY set, will turn off %s internal affinity\n"
125 " setting as the two can conflict and cause performance degradation.\n"
126 " To keep using the %s internal affinity setting, unset the\n"
127 " GOMP_CPU_AFFINITY environment variable.",
130 *message = gmx_strdup(buf.c_str());
132 GMX_CATCH_ALL_AND_EXIT_WITH_FATAL_ERROR
133 shouldSetAffinity = false;
135 # endif /* __GNUC__ */
137 #endif /* GMX_OPENMP */
138 return shouldSetAffinity;