Priority: Major - P3
Affects Version/s: None
Fix Version/s: Backlog
To investigate a perf BF, I ran two patch tests to compare between, the latest master and the latest master with 4.2 wiredtiger.
We also saw that with 4.2 patch several test results dropped, which we do not see with the latest mongodb-4.2:
- Moving from the latest wiredtiger in mongo/master to wiredtiger/mongodb-4.2 produced the same perf results for contended_update, but resulted in drop in perf for several other tests
- At this point, we do not have a good explanation of what these results mean
- It is not conclusive where the regression is coming from.
Possibly we can isolate either a change in wiredtiger keeping the latest MongoDB, or a change in MongoDB keeping the latest WiredTiger. Alternatively, there is a complex list of changes involved and we can work to bring back the performance for contended_update back to 4.2 baseline.
I have opened this ticket to address the next steps.