| commit | 0a63d23c11fa9617b4c4a254a0d1c56d00f3aeee | [log] [tgz] |
|---|---|---|
| author | Ryan Macnak <rmacnak@google.com> | Wed Jan 06 17:49:31 2021 +0000 |
| committer | commit-bot@chromium.org <commit-bot@chromium.org> | Wed Jan 06 17:49:31 2021 +0000 |
| tree | d40ee26ad490ee8b2f4cffcd3431579930e9a6d7 | |
| parent | 0f76981bb116c4ea18f12156a973b2cd5550532e [diff] |
[vm] Don't allocate a backing store for maps until the first insert. Empty maps are fairly common; delaying allocation of the backing store saves time and memory for empty maps. Non-empty maps probe an extra time for the first insert. Most maps also have few associations, so reducing the initial backing store size also saves memory on balance. The best value for dart2js would be 2 associations, but this CL changes it to 4 as a compromise with other benchmarks on Golem. Runtime as Score geomean 2.620% MemoryUse geomean -5.233% dart2js CompileSwarmLatest 0% dart2js CompileSwarmLastedMemoryUse -10.51% TEST=ci Bug: https://github.com/dart-lang/sdk/issues/26081 Change-Id: I80a925f698f3df44fae5e97e1804c8dff2ce0c60 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/176583 Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Stephen Adams <sra@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
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