git.m6w6.name Git - awesomized/libmemcached/blob - libtest/cpu.cc

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  Data Differential YATL (i.e. libtest)  library
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
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  36
  37 #include "mem_config.h"
  38 #include <libtest/common.h>
  39
  40 #include <unistd.h>
  41
  42 #pragma GCC diagnostic ignored "-Wundef"
  43
  44 #if defined(HAVE_SYS_SYSCTL_H) && HAVE_SYS_SYSCTL_H
  45 #include <sys/sysctl.h>
  46 #endif
  47
  48 namespace libtest {
  49
  50 size_t number_of_cpus()
  51 {
  52   size_t number_of_cpu= 1;
  53 #if defined(TARGET_OS_LINUX) && TARGET_OS_LINUX
  54   number_of_cpu= sysconf(_SC_NPROCESSORS_ONLN);
  55 #elif defined(HAVE_SYS_SYSCTL_H) && defined(CTL_HW) && defined(HW_NCPU) && defined(HW_AVAILCPU) && defined(HW_NCPU)
  56   int mib[4];
  57   size_t len= sizeof(number_of_cpu);
  58
  59   /* set the mib for hw.ncpu */
  60   mib[0] = CTL_HW;
  61   mib[1] = HW_AVAILCPU;  // alternatively, try HW_NCPU;
  62
  63   /* get the number of CPUs from the system */
  64   sysctl(mib, 2, &number_of_cpu, &len, NULL, 0);
  65
  66   if (number_of_cpu < 1)
  67   {
  68     mib[1]= HW_NCPU;
  69     sysctl(mib, 2, &number_of_cpu, &len, NULL, 0 );
  70
  71     if (number_of_cpu < 1 )
  72     {
  73       number_of_cpu = 1;
  74     }
  75   }
  76 #else
  77  // Guessing number of CPU
  78 #endif
  79
  80   return number_of_cpu;
  81 }
  82
  83 } // namespace libtest