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

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  libtest
   4  *
   5  *  Copyright (C) 2012 Data Differential, http://datadifferential.com/
   6  *
   7  *  This library is free software; you can redistribute it and/or
   8  *  modify it under the terms of the GNU Lesser General Public
   9  *  License as published by the Free Software Foundation; either
  10  *  version 3 of the License, or (at your option) any later version.
  11  *
  12  *  This library is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  *  Lesser General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU Lesser General Public
  18  *  License along with this library; if not, write to the Free Software
  19  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  20  */
  21
  22 #include <libtest/common.h>
  23
  24 #include <unistd.h>
  25
  26 namespace libtest {
  27
  28 size_t number_of_cpus()
  29 {
  30   size_t number_of_cpu= 1;
  31 #ifdef TARGET_OS_LINUX
  32   number_of_cpu= sysconf(_SC_NPROCESSORS_ONLN);
  33 #elif TARGET_OS_OSX || TARGET_OS_FREEBSD
  34   int mib[4];
  35   size_t len= sizeof(number_of_cpu);
  36
  37   /* set the mib for hw.ncpu */
  38   mib[0] = CTL_HW;
  39   mib[1] = HW_AVAILCPU;  // alternatively, try HW_NCPU;
  40
  41   /* get the number of CPUs from the system */
  42   sysctl(mib, 2, &number_of_cpu, &len, NULL, 0);
  43
  44   if (number_of_cpu < 1)
  45   {
  46     mib[1]= HW_NCPU;
  47     sysctl(mib, 2, &number_of_cpu, &len, NULL, 0 );
  48
  49     if (number_of_cpu < 1 )
  50     {
  51       number_of_cpu = 1;
  52     }
  53   }
  54 #endif
  55
  56   return number_of_cpu;
  57 }
  58
  59 } // namespace libtest