Process.wait() can hog CPU resources on UNIX

[giampaolo]

From g.rodola on January 19, 2012 20:49:23

What steps will reproduce the problem?  
Apply the following change (based on r1250 ) and run tests

--- test/test_psutil.py (revisione 1250)
+++ test/test_psutil.py (copia locale)
@@ -581,7 +581,7 @@
         grandson_pid = int(sproc.stdout.read())
         grandson_proc = psutil.Process(grandson_pid)
         try:
-            self.assertRaises(psutil.TimeoutExpired, grandson_proc.wait, 0.01)
+            self.assertRaises(psutil.TimeoutExpired, grandson_proc.wait)
             grandson_proc.kill()
             ret = grandson_proc.wait()
             self.assertEqual(ret, None) 

What is the expected output?  
Normal CPU usage, 

What do you see instead?  
The CPU usage bumps up at 100%. 

Please use labels and text to provide additional information.  
wait() on POSIX uses a busy loop to check whether the process is gone.
To avoid hogging CPU resources we use a time.sleep() call but in case we 
attempt to wait() for a process which is not a children of the current one, 
time.sleep() will never get called.

Original issue: http://code.google.com/p/psutil/issues/detail?id=244

[giampaolo]

From g.rodola on January 19, 2012 11:54:12

Fixed in r1251 .

Status: FixedInSVN

[giampaolo]

From g.rodola on January 30, 2012 04:19:51

Labels: Milestone-0.5.0

[giampaolo]

From g.rodola on June 19, 2012 19:21:16

Labels: -Priority-Medium Priority-High

[giampaolo]

From g.rodola on June 27, 2012 11:54:03

0.5.0 is finally out. Closing out as fixed.

Status: Fixed

[giampaolo]

From g.rodola on March 02, 2013 04:06:35

Updated csets after the SVN -> Mercurial migration: r1250 == revision 
4d13227f25a2 r1251 == revision 37ceb4c2eb68