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Generalize getconf _NPROCESSORS_ONLN
authorRainer Orth <ro@CeBiTec.Uni-Bielefeld.DE>
Thu, 30 May 2019 09:06:48 +0000 (09:06 +0000)
committerRainer Orth <ro@gcc.gnu.org>
Thu, 30 May 2019 09:06:48 +0000 (09:06 +0000)
libgomp:
* configure.ac: Call AX_COUNT_CPUS.
Substitute CPU_COUNT.
* testsuite/Makefile.am (check-am): Use CPU_COUNT as processor
count fallback.
* aclocal.m4: Regenerate.
* configure: Regenerate.
* Makefile.in, testsuite/Makefile.in: Regenerate.

config:
* ax_count_cpus.m4: New file.

From-SVN: r271769

config/ChangeLog patch | blob | history
config/ax_count_cpus.m4 [new file with mode: 0644] patch | blob
libgomp/ChangeLog patch | blob | history
libgomp/Makefile.in patch | blob | history
libgomp/aclocal.m4 patch | blob | history
libgomp/configure patch | blob | history
libgomp/configure.ac patch | blob | history
libgomp/testsuite/Makefile.am patch | blob | history
libgomp/testsuite/Makefile.in patch | blob | history

diff --git a/config/ChangeLog b/config/ChangeLog
index b9194c0..c323fc4 100644 (file)
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -1,3 +1,7 @@
+2019-05-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+       * ax_count_cpus.m4: New file.
+
 2019-05-02  Richard Biener  <rguenther@suse.de>
 
        PR bootstrap/85574
diff --git a/config/ax_count_cpus.m4 b/config/ax_count_cpus.m4
new file mode 100644 (file)
index 0000000..5db8925
--- /dev/null
+++ b/config/ax_count_cpus.m4
@@ -0,0 +1,101 @@
+# ===========================================================================
+#      https://www.gnu.org/software/autoconf-archive/ax_count_cpus.html
+# ===========================================================================
+#
+# SYNOPSIS
+#
+#   AX_COUNT_CPUS([ACTION-IF-DETECTED],[ACTION-IF-NOT-DETECTED])
+#
+# DESCRIPTION
+#
+#   Attempt to count the number of logical processor cores (including
+#   virtual and HT cores) currently available to use on the machine and
+#   place detected value in CPU_COUNT variable.
+#
+#   On successful detection, ACTION-IF-DETECTED is executed if present. If
+#   the detection fails, then ACTION-IF-NOT-DETECTED is triggered. The
+#   default ACTION-IF-NOT-DETECTED is to set CPU_COUNT to 1.
+#
+# LICENSE
+#
+#   Copyright (c) 2014,2016 Karlson2k (Evgeny Grin) <k2k@narod.ru>
+#   Copyright (c) 2012 Brian Aker <brian@tangent.org>
+#   Copyright (c) 2008 Michael Paul Bailey <jinxidoru@byu.net>
+#   Copyright (c) 2008 Christophe Tournayre <turn3r@users.sourceforge.net>
+#
+#   Copying and distribution of this file, with or without modification, are
+#   permitted in any medium without royalty provided the copyright notice
+#   and this notice are preserved. This file is offered as-is, without any
+#   warranty.
+
+#serial 22
+
+  AC_DEFUN([AX_COUNT_CPUS],[dnl
+      AC_REQUIRE([AC_CANONICAL_HOST])dnl
+      AC_REQUIRE([AC_PROG_EGREP])dnl
+      AC_MSG_CHECKING([the number of available CPUs])
+      CPU_COUNT="0"
+
+      # Try generic methods
+
+      # 'getconf' is POSIX utility, but '_NPROCESSORS_ONLN' and
+      # 'NPROCESSORS_ONLN' are platform-specific
+      command -v getconf >/dev/null 2>&1 && \
+        CPU_COUNT=`getconf _NPROCESSORS_ONLN 2>/dev/null || getconf NPROCESSORS_ONLN 2>/dev/null` || CPU_COUNT="0"
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v nproc >/dev/null 2>&1]],[[: # empty]],[dnl
+        # 'nproc' is part of GNU Coreutils and is widely available
+        CPU_COUNT=`OMP_NUM_THREADS='' nproc 2>/dev/null` || CPU_COUNT=`nproc 2>/dev/null` || CPU_COUNT="0"
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
+        # Try platform-specific preferred methods
+        AS_CASE([[$host_os]],dnl
+          [[*linux*]],[[CPU_COUNT=`lscpu -p 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+,' -c` || CPU_COUNT="0"]],dnl
+          [[*darwin*]],[[CPU_COUNT=`sysctl -n hw.logicalcpu 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[freebsd*]],[[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n kern.smp.cpus 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[netbsd*]], [[command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n hw.ncpuonline 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[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
+          [[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
+          [[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
+          [[cygwin*]],[[CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^@<:@0-9@:>@+/' -c` || CPU_COUNT="0"]]dnl
+        )dnl
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v sysctl >/dev/null 2>&1]],[[: # empty]],[dnl
+        # Try less preferred generic method
+        # 'hw.ncpu' exist on many platforms, but not on GNU/Linux
+        CPU_COUNT=`sysctl -n hw.ncpu 2>/dev/null` || CPU_COUNT="0"
+      ])dnl
+
+      AS_IF([[test "$CPU_COUNT" -gt "0" 2>/dev/null]],[[: # empty]],[dnl
+      # Try platform-specific fallback methods
+      # They can be less accurate and slower then preferred methods
+        AS_CASE([[$host_os]],dnl
+          [[*linux*]],[[CPU_COUNT=`$EGREP -e '^processor' -c /proc/cpuinfo 2>/dev/null` || CPU_COUNT="0"]],dnl
+          [[*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
+          [[freebsd*]],[[CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+: '|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
+          [[netbsd*]], [[CPU_COUNT=`command -v cpuctl >/dev/null 2>&1 && cpuctl list 2>/dev/null| $EGREP -e '^@<:@0-9@:>@+ .* online ' -c` || \
+                           CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu@<:@0-9@:>@+ at'|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0"]],dnl
+          [[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'` || \
+                           CPU_COUNT=`kstat -m cpu_info 2>/dev/null | $EGREP -c -e 'module: cpu_info'` || CPU_COUNT="0"]],dnl
+          [[mingw*]],[AS_IF([[CPU_COUNT=`reg query 'HKLM\\Hardware\\Description\\System\\CentralProcessor' 2>/dev/null | $EGREP -e '\\\\@<:@0-9@:>@+$' -c`]],dnl
+                        [[: # empty]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]])],dnl
+          [[msys*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]],dnl
+          [[cygwin*]],[[test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"]]dnl
+        )dnl
+      ])dnl
+
+      AS_IF([[test "x$CPU_COUNT" != "x0" && test "$CPU_COUNT" -gt 0 2>/dev/null]],[dnl
+          AC_MSG_RESULT([[$CPU_COUNT]])
+          m4_ifvaln([$1],[$1],)dnl
+        ],[dnl
+          m4_ifval([$2],[dnl
+            AS_UNSET([[CPU_COUNT]])
+            AC_MSG_RESULT([[unable to detect]])
+            $2
+          ], [dnl
+            CPU_COUNT="1"
+            AC_MSG_RESULT([[unable to detect (assuming 1)]])
+          ])dnl
+        ])dnl
+      ])dnl
diff --git a/libgomp/ChangeLog b/libgomp/ChangeLog
index b9bf097..2e1a00e 100644 (file)
--- a/libgomp/ChangeLog
+++ b/libgomp/ChangeLog
@@ -1,3 +1,13 @@
+2019-05-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+       * configure.ac: Call AX_COUNT_CPUS.
+       Substitute CPU_COUNT.
+       * testsuite/Makefile.am (check-am): Use CPU_COUNT as processor
+       count fallback.
+       * aclocal.m4: Regenerate.
+       * configure: Regenerate.
+       * Makefile.in, testsuite/Makefile.in: Regenerate.
+
 2019-05-29  Jakub Jelinek  <jakub@redhat.com>
 
        * testsuite/libgomp.c-c++-common/lastprivate_conditional_4.c: Rename
diff --git a/libgomp/Makefile.in b/libgomp/Makefile.in
index 1e2fa89..5abf7d4 100644 (file)
--- a/libgomp/Makefile.in
+++ b/libgomp/Makefile.in
@@ -16,7 +16,7 @@
 
 # Plugins for offload execution, Makefile.am fragment.
 #
-# Copyright (C) 2014-2018 Free Software Foundation, Inc.
+# Copyright (C) 2014-2019 Free Software Foundation, Inc.
 #
 # Contributed by Mentor Embedded.
 #
@@ -124,6 +124,7 @@ target_triplet = @target@
 subdir = .
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
+       $(top_srcdir)/../config/ax_count_cpus.m4 \
        $(top_srcdir)/../config/depstand.m4 \
        $(top_srcdir)/../config/enable.m4 \
        $(top_srcdir)/../config/futex.m4 \
@@ -365,6 +366,7 @@ CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
+CPU_COUNT = @CPU_COUNT@
 CUDA_DRIVER_INCLUDE = @CUDA_DRIVER_INCLUDE@
 CUDA_DRIVER_LIB = @CUDA_DRIVER_LIB@
 CYGPATH_W = @CYGPATH_W@
diff --git a/libgomp/aclocal.m4 b/libgomp/aclocal.m4
index 252d5fc..9d3a4ec 100644 (file)
--- a/libgomp/aclocal.m4
+++ b/libgomp/aclocal.m4
@@ -1168,6 +1168,7 @@ AC_SUBST([am__untar])
 ]) # _AM_PROG_TAR
 
 m4_include([../config/acx.m4])
+m4_include([../config/ax_count_cpus.m4])
 m4_include([../config/depstand.m4])
 m4_include([../config/enable.m4])
 m4_include([../config/futex.m4])
diff --git a/libgomp/configure b/libgomp/configure
index b4bc4f4..fd7394b 100755 (executable)
--- a/libgomp/configure
+++ b/libgomp/configure
@@ -653,6 +653,7 @@ link_gomp
 XLDFLAGS
 XCFLAGS
 config_path
+CPU_COUNT
 LIBGOMP_BUILD_VERSIONED_SHLIB_SUN_FALSE
 LIBGOMP_BUILD_VERSIONED_SHLIB_SUN_TRUE
 LIBGOMP_BUILD_VERSIONED_SHLIB_GNU_FALSE
@@ -11393,7 +11394,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11396 "configure"
+#line 11397 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -11499,7 +11500,7 @@ else
   lt_dlunknown=0; lt_dlno_uscore=1; lt_dlneed_uscore=2
   lt_status=$lt_dlunknown
   cat > conftest.$ac_ext <<_LT_EOF
-#line 11502 "configure"
+#line 11503 "configure"
 #include "confdefs.h"
 
 #if HAVE_DLFCN_H
@@ -15376,7 +15377,7 @@ fi
 
 # Plugins for offload execution, configure.ac fragment.  -*- mode: autoconf -*-
 #
-# Copyright (C) 2014-2018 Free Software Foundation, Inc.
+# Copyright (C) 2014-2019 Free Software Foundation, Inc.
 #
 # Contributed by Mentor Embedded.
 #
@@ -15824,8 +15825,7 @@ for ac_func in aligned_alloc posix_memalign memalign _aligned_malloc
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"
-eval as_val=\$$as_ac_var
-   if test "x$as_val" = x""yes; then :
+if eval test \"x\$"$as_ac_var"\" = x"yes"; then :
   cat >>confdefs.h <<_ACEOF
 #define `$as_echo "HAVE_$ac_func" | $as_tr_cpp` 1
 _ACEOF
@@ -16905,6 +16905,101 @@ $as_echo "#define LIBGOMP_GNU_SYMBOL_VERSIONING 1" >>confdefs.h
 
 fi
 
+# Determine cpu count to limit testsuite parallelism.
+                  { $as_echo "$as_me:${as_lineno-$LINENO}: checking the number of available CPUs" >&5
+$as_echo_n "checking the number of available CPUs... " >&6; }
+      CPU_COUNT="0"
+
+      # Try generic methods
+
+      # 'getconf' is POSIX utility, but '_NPROCESSORS_ONLN' and
+      # 'NPROCESSORS_ONLN' are platform-specific
+      command -v getconf >/dev/null 2>&1 && \
+        CPU_COUNT=`getconf _NPROCESSORS_ONLN 2>/dev/null || getconf NPROCESSORS_ONLN 2>/dev/null` || CPU_COUNT="0"
+      if test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v nproc >/dev/null 2>&1; then :
+  : # empty
+else
+          # 'nproc' is part of GNU Coreutils and is widely available
+        CPU_COUNT=`OMP_NUM_THREADS='' nproc 2>/dev/null` || CPU_COUNT=`nproc 2>/dev/null` || CPU_COUNT="0"
+
+fi
+      if test "$CPU_COUNT" -gt "0" 2>/dev/null; then :
+  : # empty
+else
+          # Try platform-specific preferred methods
+        case $host_os in #(
+            *linux*) :
+    CPU_COUNT=`lscpu -p 2>/dev/null | $EGREP -e '^[0-9]+,' -c` || CPU_COUNT="0" ;; #(
+            *darwin*) :
+    CPU_COUNT=`sysctl -n hw.logicalcpu 2>/dev/null` || CPU_COUNT="0" ;; #(
+            freebsd*) :
+    command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n kern.smp.cpus 2>/dev/null` || CPU_COUNT="0" ;; #(
+            netbsd*) :
+    command -v sysctl >/dev/null 2>&1 && CPU_COUNT=`sysctl -n hw.ncpuonline 2>/dev/null` || CPU_COUNT="0" ;; #(
+            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" ;; #(
+            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" ;; #(
+            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" ;; #(
+            cygwin*) :
+    CPU_COUNT=`ls -qpU1 /proc/registry/HKEY_LOCAL_MACHINE/HARDWARE/DESCRIPTION/System/CentralProcessor/ 2>/dev/null | $EGREP -e '^[0-9]+/' -c` || CPU_COUNT="0"         ;; #(
+  *) :
+     ;;
+esac
+fi
+      if test "$CPU_COUNT" -gt "0" 2>/dev/null || ! command -v sysctl >/dev/null 2>&1; then :
+  : # empty
+else
+          # Try less preferred generic method
+        # 'hw.ncpu' exist on many platforms, but not on GNU/Linux
+        CPU_COUNT=`sysctl -n hw.ncpu 2>/dev/null` || CPU_COUNT="0"
+
+fi
+      if test "$CPU_COUNT" -gt "0" 2>/dev/null; then :
+  : # empty
+else
+        # Try platform-specific fallback methods
+      # They can be less accurate and slower then preferred methods
+        case $host_os in #(
+            *linux*) :
+    CPU_COUNT=`$EGREP -e '^processor' -c /proc/cpuinfo 2>/dev/null` || CPU_COUNT="0" ;; #(
+            *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" ;; #(
+            freebsd*) :
+    CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu[0-9]+: '|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0" ;; #(
+            netbsd*) :
+    CPU_COUNT=`command -v cpuctl >/dev/null 2>&1 && cpuctl list 2>/dev/null| $EGREP -e '^[0-9]+ .* online ' -c` || \
+                           CPU_COUNT=`dmesg 2>/dev/null| $EGREP -e '^cpu[0-9]+ at'|sort -u|$EGREP -e '^' -c` || CPU_COUNT="0" ;; #(
+            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'` || \
+                           CPU_COUNT=`kstat -m cpu_info 2>/dev/null | $EGREP -c -e 'module: cpu_info'` || CPU_COUNT="0" ;; #(
+            mingw*) :
+    if CPU_COUNT=`reg query 'HKLM\\Hardware\\Description\\System\\CentralProcessor' 2>/dev/null | $EGREP -e '\\\\[0-9]+$' -c`; then :
+                          : # empty
+else
+  test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"
+fi ;; #(
+            msys*) :
+    test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS" ;; #(
+            cygwin*) :
+    test "$NUMBER_OF_PROCESSORS" -gt "0" 2>/dev/null && CPU_COUNT="$NUMBER_OF_PROCESSORS"         ;; #(
+  *) :
+     ;;
+esac
+fi
+      if test "x$CPU_COUNT" != "x0" && test "$CPU_COUNT" -gt 0 2>/dev/null; then :
+            { $as_echo "$as_me:${as_lineno-$LINENO}: result: $CPU_COUNT" >&5
+$as_echo "$CPU_COUNT" >&6; }
+
+else
+                        CPU_COUNT="1"
+            { $as_echo "$as_me:${as_lineno-$LINENO}: result: unable to detect (assuming 1)" >&5
+$as_echo "unable to detect (assuming 1)" >&6; }
+
+fi
+
+
 # Get target configury.
 . ${srcdir}/configure.tgt
 CFLAGS="$save_CFLAGS $XCFLAGS"
diff --git a/libgomp/configure.ac b/libgomp/configure.ac
index f75c622..707d5cd 100644 (file)
--- a/libgomp/configure.ac
+++ b/libgomp/configure.ac
@@ -318,6 +318,10 @@ if test $enable_symvers = gnu; then
            [Define to 1 if GNU symbol versioning is used for libgomp.])
 fi
 
+# Determine cpu count to limit testsuite parallelism.
+AX_COUNT_CPUS
+AC_SUBST(CPU_COUNT)
+
 # Get target configury.
 . ${srcdir}/configure.tgt
 CFLAGS="$save_CFLAGS $XCFLAGS"
diff --git a/libgomp/testsuite/Makefile.am b/libgomp/testsuite/Makefile.am
index 2100f49..62b1855 100644 (file)
--- a/libgomp/testsuite/Makefile.am
+++ b/libgomp/testsuite/Makefile.am
@@ -69,11 +69,11 @@ distclean-DEJAGNU:
 distclean-am: distclean-DEJAGNU
 check-am:
        @if test -n "$(filter -j%, $(MFLAGS))"; then \
-         num_cpus=1; \
+         num_cpus=@CPU_COUNT@; \
          if type -p getconf 2>/dev/null >/dev/null; then \
            num_cpus=`getconf _NPROCESSORS_ONLN 2>/dev/null`; \
            case "$$num_cpus" in \
-             '' | 0* | *[!0-9]*) num_cpus=1;; \
+             '' | 0* | *[!0-9]*) num_cpus=@CPU_COUNT@;; \
            esac; \
          fi; \
          if test $$num_cpus -gt 8 && test -z "$$OMP_NUM_THREADS"; then \
diff --git a/libgomp/testsuite/Makefile.in b/libgomp/testsuite/Makefile.in
index 80315b1..0161041 100644 (file)
--- a/libgomp/testsuite/Makefile.in
+++ b/libgomp/testsuite/Makefile.in
@@ -91,6 +91,7 @@ target_triplet = @target@
 subdir = testsuite
 ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
 am__aclocal_m4_deps = $(top_srcdir)/../config/acx.m4 \
+       $(top_srcdir)/../config/ax_count_cpus.m4 \
        $(top_srcdir)/../config/depstand.m4 \
        $(top_srcdir)/../config/enable.m4 \
        $(top_srcdir)/../config/futex.m4 \
@@ -143,6 +144,7 @@ CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
 CPPFLAGS = @CPPFLAGS@
+CPU_COUNT = @CPU_COUNT@
 CUDA_DRIVER_INCLUDE = @CUDA_DRIVER_INCLUDE@
 CUDA_DRIVER_LIB = @CUDA_DRIVER_LIB@
 CYGPATH_W = @CYGPATH_W@
@@ -521,11 +523,11 @@ distclean-DEJAGNU:
 distclean-am: distclean-DEJAGNU
 check-am:
        @if test -n "$(filter -j%, $(MFLAGS))"; then \
-         num_cpus=1; \
+         num_cpus=@CPU_COUNT@; \
          if type -p getconf 2>/dev/null >/dev/null; then \
            num_cpus=`getconf _NPROCESSORS_ONLN 2>/dev/null`; \
            case "$$num_cpus" in \
-             '' | 0* | *[!0-9]*) num_cpus=1;; \
+             '' | 0* | *[!0-9]*) num_cpus=@CPU_COUNT@;; \
            esac; \
          fi; \
          if test $$num_cpus -gt 8 && test -z "$$OMP_NUM_THREADS"; then \
Domain: System / Toolchain;