[SERVER-12378] findOne queries on _id field are slower in 2.6/2.4 than in 2.2 Created: 16/Jan/14  Updated: 18/Feb/15  Resolved: 18/Feb/15

Status: Closed
Project: Core Server
Component/s: Concurrency, Querying
Affects Version/s: 2.4.8, 2.5.4
Fix Version/s: None

Type: Bug Priority: Major - P3
Reporter: Davide Italiano Assignee: Davide Italiano
Resolution: Duplicate Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified
Environment:

Linux ip-10-237-131-70 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux


Attachments: PNG File Screenshot 2014-01-12 18.47.59.png    
Operating System: ALL
Participants:

 Description   

Queries of the kind

db.foo.findOne({_id: 0})

are about 5% slower in 2.6 than in 2.2 on heavy-multithreaded tests (8-16 threads), screenshot attached.



 Comments   
Comment by J Rassi [ 18/Feb/15 ]

Resolving as dup of SERVER-13685.

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