revise the run_benchmark.sh

tests/benchmark/run_benchmark.sh

@@ -53,7 +53,7 @@ function _train(){
         echo -e "${model_name}, SUCCESS"
         export job_fail_flag=0
     fi
-    kill -9 `ps -ef|grep 'python'|awk '{print $2}'`
+    trap 'for pid in $(jobs -pr); do kill -KILL $pid; done' INT QUIT TERM
 
     if [ $run_mode = "mp" -a -d mylog ]; then
         rm ${log_file}