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/
   6  *
   7  *  Redistribution and use in source and binary forms, with or without
   8  *  modification, are permitted provided that the following conditions are
   9  *  met:
  10  *
  11  *      * Redistributions of source code must retain the above copyright
  12  *  notice, this list of conditions and the following disclaimer.
  13  *
  14  *      * Redistributions in binary form must reproduce the above
  15  *  copyright notice, this list of conditions and the following disclaimer
  16  *  in the documentation and/or other materials provided with the
  17  *  distribution.
  18  *
  19  *      * The names of its contributors may not be used to endorse or
  20  *  promote products derived from this software without specific prior
  21  *  written permission.
  22  *
  23  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  26  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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  33  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  */
  36
  37 #include "libtest/yatlcon.h"
  38 #include <libtest/common.h>
  39
  40 #include <unistd.h>
  41
  42 #pragma GCC diagnostic ignored "-Wundef"
  43
  44 #if defined(HAVE_LINUX_SYSCTL_H) && HAVE_LINUX_SYSCTL_H
  45 #include <linux/sysctl.h>
  46 #elif defined(HAVE_SYS_SYSCTL_H) && HAVE_SYS_SYSCTL_H
  47 #include <sys/sysctl.h>
  48 #endif
  49
  50 namespace libtest {
  51
  52 size_t number_of_cpus()
  53 {
  54   size_t number_of_cpu= 1;
  55 #if defined(__linux) && __linux
  56   number_of_cpu= sysconf(_SC_NPROCESSORS_ONLN);
  57 #elif defined(HAVE_SYS_SYSCTL_H) && defined(CTL_HW) && defined(HW_NCPU) && defined(HW_AVAILCPU) && defined(HW_NCPU)
  58   int mib[4];
  59   size_t len= sizeof(number_of_cpu);
  60
  61   /* set the mib for hw.ncpu */
  62   mib[0] = CTL_HW;
  63   mib[1] = HW_AVAILCPU;  // alternatively, try HW_NCPU;
  64
  65   /* get the number of CPUs from the system */
  66   sysctl(mib, 2, &number_of_cpu, &len, NULL, 0);
  67
  68   if (number_of_cpu < 1)
  69   {
  70     mib[1]= HW_NCPU;
  71     sysctl(mib, 2, &number_of_cpu, &len, NULL, 0 );
  72
  73     if (number_of_cpu < 1 )
  74     {
  75       number_of_cpu = 1;
  76     }
  77   }
  78 #else
  79  // Guessing number of CPU
  80 #endif
  81
  82   return number_of_cpu;
  83 }
  84
  85 } // namespace libtest