diff --git a/jieba/__init__.py b/jieba/__init__.py
index 0e894c6..6b066d0 100644
--- a/jieba/__init__.py
+++ b/jieba/__init__.py
@@ -297,7 +297,7 @@ def __lcut_for_search(sentence):
 
 
 @require_initialized
-def enable_parallel(processnum):
+def enable_parallel(processnum=None):
     global pool,cut,cut_for_search
     if os.name=='nt':
         raise Exception("jieba: parallel mode only supports posix system")
diff --git a/test/parallel/test_file.py b/test/parallel/test_file.py
index e10d1a2..01ce380 100644
--- a/test/parallel/test_file.py
+++ b/test/parallel/test_file.py
@@ -9,14 +9,13 @@ jieba.enable_parallel()
 url = sys.argv[1]
 content = open(url,"rb").read()
 t1 = time.time()
-words = list(jieba.cut(content))
+words = "/ ".join(jieba.cut(content))
 
 t2 = time.time()
 tm_cost = t2-t1
 
 log_f = open("1.log","wb")
-for w in words:
-    print >> log_f, w.encode("utf-8"), "/" ,
+log_f.write(words.encode('utf-8'))
 
 print 'speed' , len(content)/tm_cost, " bytes/second"
 
diff --git a/test/test_file.py b/test/test_file.py
index 288c2cc..6234e2a 100644
--- a/test/test_file.py
+++ b/test/test_file.py
@@ -8,14 +8,14 @@ jieba.initialize()
 url = sys.argv[1]
 content = open(url,"rb").read()
 t1 = time.time()
-words = list(jieba.cut(content))
+words = "/ ".join(jieba.cut(content))
 
 t2 = time.time()
 tm_cost = t2-t1
 
 log_f = open("1.log","wb")
-for w in words:
-    print >> log_f, w.encode("utf-8"), "/" ,
+log_f.write(words.encode('utf-8'))
+
 print 'cost',tm_cost
 print 'speed' , len(content)/tm_cost, " bytes/second"