Scripts: May fix CPU drain issue on powerful machines.

apollo.sh

@@ -135,6 +135,12 @@ function generate_build_targets() {
   fi
 }
 
+function jobs_count() {
+  CPU_COUNT=$(nproc)
+  CPU_FACTOR="0.7"
+  python -c "print(int(max(${CPU_COUNT} * ${CPU_FACTOR}, 1)))"
+}
+
 #=================================================
 #              Build functions
 #=================================================
@@ -151,7 +157,7 @@ function build() {
   info "Building on $MACHINE_ARCH..."
 
   MACHINE_ARCH=$(uname -m)
-  JOB_ARG="--jobs=$(nproc) --ram_utilization_factor 80"
+  JOB_ARG="--jobs=$(jobs_count) --ram_utilization_factor 80"
   if [ "$MACHINE_ARCH" == 'aarch64' ]; then
     JOB_ARG="--jobs=3"
   fi
@@ -469,7 +475,7 @@ function gen_coverage() {
 }
 
 function run_test() {
-  JOB_ARG="--jobs=$(nproc) --ram_utilization_factor 80"
+  JOB_ARG="--jobs=$(jobs_count) --ram_utilization_factor 80"
 
   generate_build_targets
   if [ "$USE_GPU" == "1" ]; then