[SERVER-46916] Make misc. map reduce performance improvements Created: 17/Mar/20  Updated: 29/Oct/23  Resolved: 06/Apr/20

Status: Closed
Project: Core Server
Component/s: None
Affects Version/s: None
Fix Version/s: 4.4.0-rc2, 4.7.0

Type: Task Priority: Major - P3
Reporter: Eric Cox (Inactive) Assignee: Ian Boros
Resolution: Fixed Votes: 0
Labels: qexec-team
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Issue Links:
Backports
Depends
Problem/Incident
Related
is related to SERVER-47370 Projection pushdown can hinder perfor... Backlog
is related to SERVER-57206 Compiler warnings in JSStringWrapper:... Closed
Backwards Compatibility: Fully Compatible
Backport Requested:
v4.4
Sprint: Query 2020-03-23, Query 2020-04-06, Query 2020-04-20
Participants:
Linked BF Score: 0

 Description   

There are a few opportunities for optimization in the special map reduce expressions that could give a 25-30% performance improvement for the map reduce sysperf workloads.



 Comments   
Comment by Githook User [ 10/Apr/20 ]

Author:

{'name': 'Ian Boros', 'email': 'ian.boros@mongodb.com', 'username': 'puppyofkosh'}

Message: SERVER-46916 misc. map reduce performance improvements

(cherry picked from commit 1fa4585c079fe392650258f0654df64d29678af4)
Branch: v4.4
https://github.com/mongodb/mongo/commit/494017bdd1cd12f66e44a5338d4a4a2d94578f35

Comment by Ian Boros [ 06/Apr/20 ]

Re-purposing this ticket to be about misc. map reduce improvements. I moved+expanded on the original description in SERVER-47370.

 

Comment by Githook User [ 06/Apr/20 ]

Author:

{'name': 'Ian Boros', 'email': 'ian.boros@mongodb.com', 'username': 'puppyofkosh'}

Message: SERVER-46916 misc. map reduce performance improvements
Branch: master
https://github.com/mongodb/mongo/commit/1fa4585c079fe392650258f0654df64d29678af4

Comment by Eric Cox (Inactive) [ 31/Mar/20 ]

My initial patch that disabled the project pushdown showed a 30% - 40% gain over the current regressions.

https://evergreen.mongodb.com/task/sys_perf_linux_standalone_map_reduce_workloads_patch_80c8c36136070c72c29b3dc8b5d815440f7bd373_5e74da84a4cf4721ea1cd6b8_20_03_20_15_01_29##%257B%2522compare%2522%253A%255B%257B%2522hash%2522%253A%252280c8c36136070c72c29b3dc8b5d815440f7bd373%2522%257D%255D%257D

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