Change how numProc is derived on Linux (#13909)

Before the decision for numProcs to run in parallel for runtests.sh
was based on _NPROCESSORS_ONLN which harware which attempts to save
power (eg arm(64)) this number may be < numProcs.

1 files changed, 3 insertions, 1 deletions

diff --git a/build.sh b/build.sh
index d5a35d20f7..97a11c2b15 100755
--- a/build.sh
+++ b/build.sh
@@ -643,8 +643,10 @@ if [ `uname` = "FreeBSD" ]; then
   __NumProc=`sysctl hw.ncpu | awk '{ print $2+1 }'`
 elif [ `uname` = "NetBSD" ]; then
   __NumProc=$(($(getconf NPROCESSORS_ONLN)+1))
-else
+elif [ `uname` = "Darwin" ]; then
   __NumProc=$(($(getconf _NPROCESSORS_ONLN)+1))
+else
+  __NumProc=$(nproc --all)
 fi
 
 while :; do