git.m6w6.name Git - m6w6/libmemcached/blob - m4/ax_count_cpus.m4

   1 # ===========================================================================
   2 #      https://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
   3 # ===========================================================================
   4 #
   5 # SYNOPSIS
   6 #
   7 #   AX_COUNT_CPUS([ACTION-IF-DETECTED],[ACTION-IF-NOT-DETECTED])
   8 #
   9 # DESCRIPTION
  10 #
  11 #   Attempt to count the number of logical processor cores (including
  12 #   virtual and HT cores) currently available to use on the machine and
  13 #   place detected value in CPU_COUNT variable.
  14 #
  15 #   On successful detection, ACTION-IF-DETECTED is executed if present. If
  16 #   the detection fails, then ACTION-IF-NOT-DETECTED is triggered. The
  17 #   default ACTION-IF-NOT-DETECTED is to set CPU_COUNT to 1.
  18 #
  19 # LICENSE
  20 #
  21 #   Copyright (c) 2014,2016 Karlson2k (Evgeny Grin) <k2k@narod.ru>
  22 #   Copyright (c) 2012 Brian Aker <brian@tangent.org>
  23 #   Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
  24 #   Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
  25 #
  26 #   Copying and distribution of this file, with or without modification, are
  27 #   permitted in any medium without royalty provided the copyright notice
  28 #   and this notice are preserved. This file is offered as-is, without any
  29 #   warranty.
  30
  31 #serial 22
  32
  33   AC_DEFUN([AX_COUNT_CPUS],[dnl
  34       AC_REQUIRE([AC_CANONICAL_HOST])dnl
  35       AC_REQUIRE([AC_PROG_EGREP])dnl
  36       AC_MSG_CHECKING([the number of available CPUs])
  37       CPU_COUNT="0"
  38
  39       # Try generic methods
  40
  41       # 'getconf' is POSIX utility, but '_NPROCESSORS_ONLN' and
  42       # 'NPROCESSORS_ONLN' are platform-specific
  43       command -v getconf >/dev/null 2>&1 && \
  44         CPU_COUNT=`getconf _NPROCESSORS_ONLN 2>/dev/null || getconf NPROCESSORS_ONLN 2>/dev/null` || CPU_COUNT="0"
  45       AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v nproc >/dev/null 2>&1]],[[: # empty]],[dnl
  46         # 'nproc' is part of GNU Coreutils and is widely available
  47         CPU_COUNT=`OMP_NUM_THREADS='' nproc 2>/dev/null` || CPU_COUNT=`nproc 2>/dev/null` || CPU_COUNT="0"
  48       ])dnl
  49
  50       AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
  51         # Try platform-specific preferred methods
  52         AS_CASE([[$host_os]],dnl
  53           [[*linux*]],[[CPU_COUNT=`lscpu -p 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+,' -c` || CPU_COUNT="0"]],dnl
  54           [[*darwin*]],[[CPU_COUNT=`sysctl -n hw.logicalcpu 2>/dev/null` || CPU_COUNT="0"]],dnl
  55           [[freebsd*]],[[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n kern.smp.cpus 2>/dev/null` || CPU_COUNT="0"]],dnl
  56           [[netbsd*]], [[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n hw.ncpuonline 2>/dev/null` || CPU_COUNT="0"]],dnl
  57           [[solaris*]],[[command -v psrinfo >/dev/null 2>&1 && CPU_COUNT=`psrinfo 2>/dev/null | $EGREP -e '^@<:@0-9@:>@.*on-line' -c 2>/dev/null` || CPU_COUNT="0"]],dnl
  58           [[mingw*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]],dnl
  59           [[msys*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]],dnl
  60           [[cygwin*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]]dnl
  61         )dnl
  62       ])dnl
  63
  64       AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v sysctl >/dev/null 2>&1]],[[: # empty]],[dnl
  65         # Try less preferred generic method
  66         # 'hw.ncpu' exist on many platforms, but not on GNU/Linux
  67         CPU_COUNT=`sysctl -n hw.ncpu 2>/dev/null` || CPU_COUNT="0"
  68       ])dnl
  69
  70       AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
  71       # Try platform-specific fallback methods
  72       # They can be less accurate and slower then preferred methods
  73         AS_CASE([[$host_os]],dnl
  74           [[*linux*]],[[CPU_COUNT=`$EGREP -e '^processor' -c /proc/cpuinfo 2>/dev/null` || CPU_COUNT="0"]],dnl
  75           [[*darwin*]],[[CPU_COUNT=`system_profiler SPHardwareDataType 2>/dev/null | $EGREP -i -e 'number of cores:'|cut -d : -f 2 -s|tr -d ' '` || CPU_COUNT="0"]],dnl
  76           [[freebsd*]],[[CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+: '|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
  77           [[netbsd*]], [[CPU_COUNT=`command -v cpuctl >/dev/null 2>&1 && cpuctl list 2>/dev/null| $EGREP -e '^@<:@0-9@:>@+ .* online ' -c` || \
  78                            CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+ at'|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
  79           [[solaris*]],[[command -v kstat >/dev/null 2>&1 && CPU_COUNT=`kstat -m cpu_info -s state -p 2>/dev/null | $EGREP -c -e 'on-line'` || \
  80                            CPU_COUNT=`kstat -m cpu_info 2>/dev/null | $EGREP -c -e 'module: cpu_info'` || CPU_COUNT="0"]],dnl
  81           [[mingw*]],[AS_IF([[CPU_COUNT=`reg query 'HKLM\\Hardware\\Description\\System\\CentralProcessor' 2>/dev/null | $EGREP -e '\\\\@<:@0-9@:>@+$' -c`]],dnl
  82                         [[: # empty]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]])],dnl
  83           [[msys*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]],dnl
  84           [[cygwin*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]]dnl
  85         )dnl
  86       ])dnl
  87
  88       AS_IF([[test "x$CPU_COUNT" != "x0" && test "$CPU_COUNT" -gt 0 2>/dev/null]],[dnl
  89           AC_MSG_RESULT([[$CPU_COUNT]])
  90           m4_ifvaln([$1],[$1],)dnl
  91         ],[dnl
  92           m4_ifval([$2],[dnl
  93             AS_UNSET([[CPU_COUNT]])
  94             AC_MSG_RESULT([[unable to detect]])
  95             $2
  96           ], [dnl
  97             CPU_COUNT="1"
  98             AC_MSG_RESULT([[unable to detect (assuming 1)]])
  99           ])dnl
 100         ])dnl
 101       ])dnl