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
102