diff --git a/tests/auto_crash_gen_script/auto_crash_gen_script.py b/tests/auto_crash_gen_script/auto_crash_gen_script.py
index b80782bc911b275286ed01e8a2a91884285cdde1..ce0886f53c8f5d4c3e8f2825cc993d3bda5f6b08 100644
--- a/tests/auto_crash_gen_script/auto_crash_gen_script.py
+++ b/tests/auto_crash_gen_script/auto_crash_gen_script.py
@@ -18,6 +18,7 @@ import time
 
 # set path about run instance
 
+core_path = '/home/coredump/'
 base_dir = os.path.dirname(os.path.realpath(__file__))
 if base_dir.find("community")>0:
     repo = "community"
@@ -75,9 +76,9 @@ def random_args(args_list):
     args_list["--debug"]=False
     args_list["--per-thread-db-connection"]=True
     args_list["--track-memory-leaks"]=False
-    args_list["--max-steps"]=random.randint(200,300)
+    args_list["--max-steps"]=random.randint(300,500)
     
-    threads = [16,32,64]
+    threads = [32,64,128,256]
     args_list["--num-threads"]=random.sample(threads,1)[0] #$ debug
     args_list["--ignore-errors"]=[]   ## can add error codes for detail
 
@@ -168,6 +169,7 @@ def get_cmds(args_list):
 
 def run_crash_gen(crash_cmds,result_file):
     os.system('echo "%s">>%s'%(crash_cmds,crash_gen_cmds_file))
+    os.system(crash_gen_cmds_file, core_path)
     os.system("%s>>%s"%(crash_cmds,result_file))
 
 def check_status(result_file):