Avoid using BTreeMap::append
#1274
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The implementation of `BTreeMap::append` is non-performant making merging changesets very slow. We use `Extend::extend` instead. Refer to: rust-lang/rust#34666 (comment)
LLFourn
approved these changes
Jan 15, 2024
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Description
The implementation of
BTreeMap::appendis non-performant making merging changesets very slow. We useExtend::extendinstead.Refer to:
rust-lang/rust#34666 (comment)
Notes to the reviewers
This is extracted from #1172. I did this as this is a no-brainer merge whereas the rest of #1172 requires a more thoughtful review.
I discovered this when running the bitcoind examples. Loading from the database takes a very long time (if we sync from segwit activation to tip, loading
LocalChainwill take more than a minute). The culprit isBTreeMap::append(thank you for @LLFourn for this discovery).Changelog notice
Fix
BTreeMap::appenddue to performance issues (refer to BTreeSet and BTreeMap append optimization rust-lang/rust#34666 (comment)).Checklists
All Submissions:
cargo fmtandcargo clippybefore committingNew Features:
* [ ] I've added tests for the new featureBugfixes:
* [ ] This pull request breaks the existing API* [ ] I've added tests to reproduce the issue which are now passing* [ ] I'm linking the issue being fixed by this PR