From 624df072debcf6f641ebdd5808c4efaae432009f Mon Sep 17 00:00:00 2001
From: "yi.wu" <yi.wu@baifendian.com>
Date: Thu, 21 Jun 2018 09:32:43 +0800
Subject: [PATCH] add usage

---
 tools/check_ctest_hung.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/tools/check_ctest_hung.py b/tools/check_ctest_hung.py
index 162e3b2943..7de76c381b 100644
--- a/tools/check_ctest_hung.py
+++ b/tools/check_ctest_hung.py
@@ -23,6 +23,16 @@ def escape(input):
 
 
 def main():
+    usage = """Usage:
+1. Download the Paddle_PR_CI_*.log from TeamCity
+2. run: python check_ctest_hung.py Paddle_PR_CI_*.log
+3. If there is hung ctest, the result likes:
+Diff:  set(['test_parallel_executor_crf'])
+    """
+    if len(sys.argv) < 2:
+        print(usage)
+        exit(0)
+
     logfile = sys.argv[1]
     started = set()
     passed = set()
-- 
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