diff --git a/tools/commit-tests.sh b/tools/commit-tests.sh
index 223468e4b..70d54f240 100755
--- a/tools/commit-tests.sh
+++ b/tools/commit-tests.sh
@@ -4,8 +4,9 @@
 set -e
 set -x
 
-# Allow variable core usage, default uses two cores, to set 8 cores for example : commit-tests.sh -j8
-: ${CORES:=2}
+# Allow variable core usage, default uses all cpu cores, to set 8 cores for example : commit-tests.sh -j8
+num_cpus=`grep 'physical id' /proc/cpuinfo | sort -u | wc -l`
+: ${CORES:=$num_cpus}
 # Default build treats warnings as errors, set -Wno-error to override, e.g.: commit-tests.sh -Wno-error
 : ${WERROR:=1}
 # A board name to build for, or ALL