[SERVER-44898] Lower thread count and iterations of compact.js FSM workload and blacklist from certain suites Created: 02/Dec/19  Updated: 29/Oct/23  Resolved: 08/Jan/20

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 4.3.3

Type: Bug Priority: Major - P3
Reporter: Louis Williams Assignee: Daniel Ernst
Resolution: Fixed Votes: 0
Labels: None
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Depends
Related
is related to SERVER-44969 Remove the mutex around WT compact calls Closed
Backwards Compatibility: Fully Compatible
Operating System: ALL
Sprint: Execution Team 2020-01-13
Participants:
Linked BF Score: 24

 Description   

The "compact" commands takes the checkpoint mutex, which blocks on checkpoints. This was added by SERVER-43828, and causes slowness in certain concurrency workloads where the cost of checkpointing is high.

We should do two things:

  • Lower the thread count and number of iterations of the compact.js and related workloads
  • Blacklist the workload from the especially slow "concurrency_simultaneous_replication_wiredtiger_eviction_debug" and "concurrency_simultaneous_replication_wiredtiger_cursor_sweeps" suites. From what I understand, cursor sweeps block checkpoints, and eviction debug mode makes them slower, so it would be expected for the compact command to take a long time in scenarios.


 Comments   
Comment by Githook User [ 08/Jan/20 ]

Author:

{'name': 'Daniel Ernst', 'email': 'daniel.ernst@mongodb.com'}

Message: SERVER-44898 Lower thread count of compact FSM workloads and blacklist from sensitives suites
Branch: master
https://github.com/mongodb/mongo/commit/4b3046cb76b84af6d5bfccde728c52045a9d2aab

Comment by Dianna Hohensee (Inactive) [ 05/Dec/19 ]

SERVER-44969 was filed to reduce the contention of concurrent commands.

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