Bug 1315226 - mongod process causing wakeups 100 times per second
Summary: mongod process causing wakeups 100 times per second
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Satellite
Classification: Red Hat
Component: Pulp
Version: 6.1.7
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified vote
Target Milestone: Unspecified
Assignee: satellite6-bugs
QA Contact: Katello QA List
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-03-07 09:50 UTC by Pradeep Kumar Surisetty
Modified: 2017-01-04 22:33 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-01-04 22:33:39 UTC
Target Upstream Version:

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Description Pradeep Kumar Surisetty 2016-03-07 09:50:04 UTC 
Description of problem:

Install satellitte 6.1.7 (6.2 also). 
Monitor strace of mongod pid. 


select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)
select(12, [9 11], NULL, NULL, {0, 10000}) = 0 (Timeout)


This is due to one hundredth of a second timeout on select call on the listening socket. These wakeups keep mongodb in top in powertop even though there is no any workload running. 


Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. install satellite and trace mongodb using strace
2.
3.

Actual results:

too many wake ups cause more power consumption. 

Expected results:


Additional info:
Comment 1 Bryan Kearney 2016-07-26 19:02:15 UTC 
Moving 6.2 bugs out to sat-backlog.
Comment 3 Michael Hrivnak 2017-01-04 22:33:39 UTC 
This was addressed in upstream mongodb 3.3.9 and released about 6 months ago.

https://jira.mongodb.org/browse/SERVER-2114

The newest mongodb we theoretically have access to is 3.2, via software collections. Since this appears to be a minor issue, I don't think it's worth trying to get a very-new mongodb version at this time. If this is having a substantial impact, please provide details of that impact, and we could try to look for other options.
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