1# =========================================================================== 2# http://www.gnu.org/software/autoconf-archive/ax_count_cpus.html 3# =========================================================================== 4# 5# SYNOPSIS 6# 7# AX_COUNT_CPUS 8# 9# DESCRIPTION 10# 11# Attempt to count the number of processors present on the machine. If the 12# detection fails, then a value of 1 is assumed. 13# 14# The value is placed in the CPU_COUNT variable. 15# 16# LICENSE 17# 18# Copyright (c) 2014 Karlson2k (Evgeny Grin) <k2k@narod.ru> 19# Copyright (c) 2012 Brian Aker <brian@tangent.org> 20# Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net> 21# Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net> 22# 23# Copying and distribution of this file, with or without modification, are 24# permitted in any medium without royalty provided the copyright notice 25# and this notice are preserved. This file is offered as-is, without any 26# warranty. 27 28#serial 10 29 30 AC_DEFUN([AX_COUNT_CPUS],[ 31 AC_REQUIRE([AC_CANONICAL_HOST]) 32 AC_REQUIRE([AC_PROG_EGREP]) 33 AC_MSG_CHECKING([the number of available CPUs]) 34 CPU_COUNT="0" 35 36 AS_CASE([$host_os],[ 37 *darwin*],[ 38 AS_IF([test -x /usr/sbin/sysctl],[ 39 sysctl_a=`/usr/sbin/sysctl -a 2>/dev/null| grep -c hw.cpu` 40 AS_IF([test sysctl_a],[ 41 CPU_COUNT=`/usr/sbin/sysctl -n hw.ncpu` 42 ]) 43 ])],[ 44 *linux*],[ 45 AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[ 46 AS_IF([test "x$CPU_COUNT" = "x0" -a -e /proc/cpuinfo],[ 47 CPU_COUNT=`$EGREP -c '^processor' /proc/cpuinfo` 48 ]) 49 ])],[ 50 *mingw*],[ 51 AS_IF([test -n "$NUMBER_OF_PROCESSORS"],[ 52 CPU_COUNT="$NUMBER_OF_PROCESSORS" 53 ])],[ 54 *cygwin*],[ 55 AS_IF([test -n "$NUMBER_OF_PROCESSORS"],[ 56 CPU_COUNT="$NUMBER_OF_PROCESSORS" 57 ]) 58 ]) 59 60 AS_IF([test "x$CPU_COUNT" = "x0"],[ 61 CPU_COUNT="1" 62 AC_MSG_RESULT( [unable to detect (assuming 1)] ) 63 ],[ 64 AC_MSG_RESULT( $CPU_COUNT ) 65 ]) 66 ]) 67