[SERVER-28026] Disable auto-tuning of WiredTiger eviction threads Created: 16/Feb/17  Updated: 13/Apr/17  Resolved: 20/Feb/17

Status: Closed
Project: Core Server
Component/s: WiredTiger
Affects Version/s: None
Fix Version/s: 3.2.13, 3.4.3, 3.5.4

Type: Task Priority: Major - P3
Reporter: Michael Cahill (Inactive) Assignee: Alexander Gorrod
Resolution: Done Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Backports
Related
related to SERVER-28169 Set eviction=(threads_min=1) in Micro... Closed
Backwards Compatibility: Fully Compatible
Backport Completed:
Backport Requested:
v3.2
Sprint: Storage 2017-03-06
Participants:
Linked BF Score: 0

 Description   

In WT-2898, we added code to automatically tune the number of eviction worker threads in WiredTiger. That work (a) assumed eviction.threads_max was reasonably large (e.g., 8), and (b) was driven by test workloads where the behavior at startup matches the long-term workload behavior.

To avoid MongoDB users being adversely affected by that change, we should disable it in 3.2 and 3.4 by changing the default eviction.threads_min=4 – i.e., min threads = max threads = 4.



 Comments   
Comment by Githook User [ 13/Apr/17 ]

Author:

{u'username': u'agorrod', u'name': u'Alex Gorrod', u'email': u'alexander.gorrod@mongodb.com'}

Message: SERVER-28026 Ensure WiredTiger eviction threads are started
(cherry picked from commit 5a3ecdc731673c82cc841eaecf2bc59067c067be)
Branch: v3.2
https://github.com/mongodb/mongo/commit/361f6986096caf3445cb3e41969d1dbf087223b5

Comment by Githook User [ 06/Mar/17 ]

Author:

{u'username': u'agorrod', u'name': u'Alex Gorrod', u'email': u'alexander.gorrod@mongodb.com'}

Message: SERVER-28026 Ensure WiredTiger eviction threads are started

(cherry picked from commit 5a3ecdc731673c82cc841eaecf2bc59067c067be)
Branch: v3.4
https://github.com/mongodb/mongo/commit/9aa85b8390c6361a3363d946e0e34e4c227f572c

Comment by Githook User [ 20/Feb/17 ]

Author:

{u'username': u'agorrod', u'name': u'Alex Gorrod', u'email': u'alexander.gorrod@mongodb.com'}

Message: SERVER-28026 Ensure WiredTiger eviction threads are started
Branch: master
https://github.com/mongodb/mongo/commit/5a3ecdc731673c82cc841eaecf2bc59067c067be

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