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Type:
Bug
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Resolution: Won't Fix
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: Performance
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Query
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ALL
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Performance B (11/02/15)
Performance regression across all 4 build variants for single threaded performance on Mongo-Perf.
Slightly more pronounced on 1 node repl set over stand-alone, but present in both cases.
Update.MmsIncShallow1 is the largest offender.
Regression seems to be over time. Between 3.0.6, and 3.1.0, 3.1.3, and 3.1.4.
Regression in WiredTiger Standalone (cumulative 11-13% degradation) and in MMAP (cumulative 13-17% degradation).
Can be reproduced with
var setupMMS = function( collection ) { collection.drop(); var base = { _id: 0, a: 0, h: {}, z: 0 }; for (var i = 0; i < 24; i++) { base.h[i] = {}; for (var j = 0; j < 60; j++) { base.h[i][j] = { n: 0, t: 0, v: 0 }; } } collection.insert(base); }; use test0 setupMMS(db.Update_MmsIncShallow10) benchRun({"ops":[{"op":"update","query":{"_id":0},"update":{"$inc":{"a":1}},"ns":"test0.Update_MmsIncShallow10","safe":false,"w":0,"j":false,"writeCmd":true}],"seconds":5,"host":"127.0.0.1:27017","parallel":1})