Also apply NestedSet optimizations to Depset
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@comius Could you review this? It's a memory optimization of the kind you have been doing a lot of recently. |
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src/main/java/com/google/devtools/build/lib/collect/nestedset/Depset.java
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src/main/java/com/google/devtools/build/lib/collect/nestedset/Depset.java
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@bazel-io fork 6.4.0 |
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@comius Do you want me to resolve the merge conflicts or are you doing that in the imported change? |
I’m not doing that. If you can resolve the conflicts that’s welcome. Thanks |
If the construction of a `NestedSet` involves only a single non-empty transitive set, this set may be returned directly as an optimization. This commit checks for this case when constructing a `Depset` and reuses the corresponding `Depset` if possible.
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@comius Done |
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If the construction of a `NestedSet` involves only a single non-empty transitive set, this set may be returned directly as an optimization. This commit checks for this case when constructing a `Depset` and reuses the corresponding `Depset` if possible. Since `Depset`s that are direct elements of providers are usually unwrapped into their `NestedSet`, this optimization only applies to instances stored in `struct`s as well as reduces allocations. Realizes an optimization proposed by @brentleyjones in https://bazelbuild.slack.com/archives/CA31HN1T3/p1693487067454409?thread_ts=1693484609.534579&cid=CA31HN1T3. Closes bazelbuild#19379. PiperOrigin-RevId: 563679197 Change-Id: I542bbf56784832768ca3bbbd550cc78bfb981ffe
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If the construction of a `NestedSet` involves only a single non-empty transitive set, this set may be returned directly as an optimization. This commit checks for this case when constructing a `Depset` and reuses the corresponding `Depset` if possible. Since `Depset`s that are direct elements of providers are usually unwrapped into their `NestedSet`, this optimization only applies to instances stored in `struct`s as well as reduces allocations. Realizes an optimization proposed by @brentleyjones in https://bazelbuild.slack.com/archives/CA31HN1T3/p1693487067454409?thread_ts=1693484609.534579&cid=CA31HN1T3. Closes #19379. Commit 216fce5 PiperOrigin-RevId: 563679197 Change-Id: I542bbf56784832768ca3bbbd550cc78bfb981ffe Co-authored-by: Fabian Meumertzheim <fabian@meumertzhe.im>
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The changes in this PR have been included in Bazel 6.4.0 RC1. Please test out the release candidate and report any issues as soon as possible. If you're using Bazelisk, you can point to the latest RC by setting USE_BAZEL_VERSION=last_rc. |
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If the construction of a
NestedSetinvolves only a single non-empty transitive set, this set may be returned directly as an optimization. This commit checks for this case when constructing aDepsetand reuses the correspondingDepsetif possible.Since
Depsets that are direct elements of providers are usually unwrapped into theirNestedSet, this optimization only applies to instances stored instructs as well as reduces allocations.Realizes an optimization proposed by @brentleyjones in https://bazelbuild.slack.com/archives/CA31HN1T3/p1693487067454409?thread_ts=1693484609.534579&cid=CA31HN1T3.