higher precision time measurement in python perf tests

perf/python/local_thr.py

@@ -18,7 +18,7 @@
 #
 
 import sys
-from datetime import datetime
+import time
 import libpyzmq
 
 def main ():
@@ -41,15 +41,15 @@ def main ():
     msg = s.recv ()
     assert len (msg) == message_size
 
-    start = datetime.now ()
+    start = time.clock ()
 
     for i in range (1, message_count):
         msg = s.recv ()
         assert len (msg) == message_size
  
-    end = datetime.now()
+    end = time.clock ()
 
-    elapsed = (end - start).seconds * 1000000 + (end - start).microseconds
+    elapsed = (end - start) * 1000000
     if elapsed == 0:
     	elapsed = 1
     throughput = (1000000.0 * float (message_count)) / float (elapsed)

perf/python/remote_lat.py

@@ -18,7 +18,7 @@
 #
 
 import sys
-from datetime import datetime
+import time
 import libpyzmq
 
 def main ():
@@ -40,16 +40,17 @@ def main ():
 
     msg = ''.join ([' ' for n in range (0, message_size)])
 
-    start = datetime.now ()
+    start = time.clock ()
 
     for i in range (0, roundtrip_count):
         s.send (msg)
         msg = s.recv ()
         assert len (msg) == message_size
 
-    end = datetime.now ()
-    delta = (end - start).microseconds + 1000000 * (end - start).seconds
-    latency = float (delta) / roundtrip_count / 2
+    end = time.clock ()
+
+    elapsed = (end - start) * 1000000
+    latency = elapsed / roundtrip_count / 2
 
     print "message size: %.0f [B]" % (message_size, )
     print "roundtrip count: %.0f" % (roundtrip_count, )