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 <config.h>
  38 #include <libtest/common.h>
  39
  40 #include <unistd.h>
  41
  42 #if defined(HAVE_SYS_SYSCTL_H) && HAVE_SYS_SYSCTL_H
  43 #include <sys/sysctl.h>
  44 #endif
  45
  46 namespace libtest {
  47
  48 size_t number_of_cpus()
  49 {
  50   size_t number_of_cpu= 1;
  51 #if defined(TARGET_OS_LINUX) && TARGET_OS_LINUX
  52   number_of_cpu= sysconf(_SC_NPROCESSORS_ONLN);
  53 #elif defined(HAVE_SYS_SYSCTL_H) && defined(CTL_HW) && defined(HW_NCPU) && defined(HW_AVAILCPU) && defined(HW_NCPU)
  54   int mib[4];
  55   size_t len= sizeof(number_of_cpu);
  56
  57   /* set the mib for hw.ncpu */
  58   mib[0] = CTL_HW;
  59   mib[1] = HW_AVAILCPU;  // alternatively, try HW_NCPU;
  60
  61   /* get the number of CPUs from the system */
  62   sysctl(mib, 2, &number_of_cpu, &len, NULL, 0);
  63
  64   if (number_of_cpu < 1)
  65   {
  66     mib[1]= HW_NCPU;
  67     sysctl(mib, 2, &number_of_cpu, &len, NULL, 0 );
  68
  69     if (number_of_cpu < 1 )
  70     {
  71       number_of_cpu = 1;
  72     }
  73   }
  74 #else
  75  // Guessing number of CPU
  76 #endif
  77
  78   return number_of_cpu;
  79 }
  80
  81 } // namespace libtest