Description
Problem
Observed 20% drop in throughput between 3.0.0-rc9 and 2.6.7 for MMAP storage engine. WT seems to have similar perf to 2.6.7.
2.6.7 - 22907.37
3.0.0-rc9 - 18285.02
The results were gather from 20 second runs, each with 7 iterations. It can be seen there is very little variance in the attached screenshot from run-to-run.
Testcase definition
name: "MultiUpdate.v1.Contended.Doc.Seq.NoIndex"
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pre: function( collection ) {
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collection.drop();
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for ( var i = 0; i < 4800; i++ ) {
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collection.insert( { _id : i , x : 0 } );
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}
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collection.getDB().getLastError();
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collection.ensureIndex( { x : 1 } );
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}
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ops: { op: "update",
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multi: true,
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query: { _id : 1600 },
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update: { $inc : { x : 1 } }
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},
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Attachments
Issue Links
- duplicates
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SERVER-17411 20% drop in Update perf for MMAPv1 vs 2.6 MMAP
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- Closed
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- is related to
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SERVER-17411 20% drop in Update perf for MMAPv1 vs 2.6 MMAP
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- Closed
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- related to
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SERVER-17341 update on single doc is slower than 2.6 (both WT and mmapv1)
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- Closed
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