The number of concurrent drops (#24213)

Author: tianshuo78520a

paddle/scripts/paddle_build.sh

@@ -300,7 +300,7 @@ function check_style() {
 function build_base() {
     if [ "$SYSTEM" == "Linux" ];then
       if [ `nproc` -gt 16 ];then
-          parallel_number=$(expr `nproc` - 4)
+          parallel_number=$(expr `nproc` - 8)
       else
           parallel_number=`nproc`
       fi