[SERVER-18230] Increase in CPU usage w/ latest 3.1.2 vs 3.0 Created: 28/Apr/15  Updated: 08/Jul/15  Resolved: 08/Jul/15

Status: Closed
Project: Core Server
Component/s: Storage, WiredTiger
Affects Version/s: 3.1.2
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Eitan Klein Assignee: Eitan Klein
Resolution: Done Votes: 0
Labels: 32qa
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Attachments: PNG File 3 to 3.2.png    
Backwards Compatibility: Fully Compatible
Operating System: ALL
Steps To Reproduce:

Hammer mongo - Insert only

Participants:

 Description   

I've captured that running w/ the latest build with the same workload consume higher CPU usage comparing to 3.0 GA (both captured on the same AWS, windows 2012 machine)

Version IO ops per sec CPU
3.0 4100 50 %
3.1.2-pre- 4000 or a lower ~70%

see attached graph,

I opened this subject as heads up (we didn't run this test for the last month +), we should verify the source of the problem and if it's related to latest WT drop
I compared the build w/ the details below

db version v3.1.2-pre-
git version: 34b853ed0566a3bbffcd825191b9000de331bddc
OpenSSL version: OpenSSL 1.0.1m-fips 19 Mar 2015

db version v3.0.0
git version: a841fd6394365954886924a35076691b4d149168 modules: enterprise
OpenSSL version: OpenSSL 1.0.1j-fips 15 Oct 2014



 Comments   
Comment by Ian Whalen (Inactive) [ 08/Jul/15 ]

eitan.klein, we only close SERVER issues as Fixed when there is a clear fix/change (i.e. code review + commit) linked from the comments. Reopening in order to close as Gone Away.

Comment by Eitan Klein [ 08/Jul/15 ]

Performance team looked into this and didn't find any perf regression regression, closing this issue

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