docs: cmake build
[m6w6/libmemcached] / 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