On all other platforms except Macosx, the logic for detecting number of
cpus includes hyperthreading in their count. We do see some speedup from
setting the make -j flag to a number that includes HT so we should do
the same on macosx.
I chose to fix this by querying sysctl for hardware information. It also
seems to much simpler so I changed the memory detecting logic to use the
same technique.
Bug: https://bugs.openjdk.java.net/browse/JDK-8147933
Patch:
diff -r f36cf7e8ba68 common/autoconf/build-performance.m4
--- a/common/autoconf/build-performance.m4
+++ b/common/autoconf/build-performance.m4
@@ -39,7 +39,7 @@
FOUND_CORES=yes
elif test -x /usr/sbin/system_profiler; then
# Looks like a MacOSX system
- NUM_CORES=`/usr/sbin/system_profiler -detailLevel full
SPHardwareDataType | grep 'Cores' | awk '{print [$]5}'`
+ NUM_CORES=`/usr/sbin/sysctl -n hw.ncpu`
FOUND_CORES=yes
elif test "x$OPENJDK_BUILD_OS" = xaix ; then
NUM_CORES=`/usr/sbin/prtconf | grep "^Number Of Processors" | awk
'{ print [$]4 }'`
@@ -76,8 +76,8 @@
FOUND_MEM=yes
elif test -x /usr/sbin/system_profiler; then
# Looks like a MacOSX system
- MEMORY_SIZE=`/usr/sbin/system_profiler -detailLevel full
SPHardwareDataType | grep 'Memory' | awk '{print [$]2}'`
- MEMORY_SIZE=`expr $MEMORY_SIZE \* 1024`
+ MEMORY_SIZE=`/usr/sbin/sysctl -n hw.memsize`
+ MEMORY_SIZE=`expr $MEMORY_SIZE / 1024 / 1024`
FOUND_MEM=yes
elif test "x$OPENJDK_BUILD_OS" = xwindows; then
# Windows, but without cygwin
/Erik
