util/chunk: optimize (*ListInDisk).GetChunk and add a fast row container reader (#45130)
#45204
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Signed-off-by: Yang Keao <yangkeao@chunibyo.icu>
Signed-off-by: Yang Keao <yangkeao@chunibyo.icu>
Signed-off-by: Yang Keao <yangkeao@chunibyo.icu>
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: wshwsh12, xhebox The full list of commands accepted by this bot can be found here. The pull request process is described here
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Codecov Report
Additional details and impacted files@@ Coverage Diff @@
## release-6.5 #45204 +/- ##
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Coverage ? 73.6739%
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Files ? 1081
Lines ? 346737
Branches ? 0
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Hits ? 255455
Misses ? 74871
Partials ? 16411 |
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This is an automated cherry-pick of #45130
What problem does this PR solve?
Issue Number: close #45125
Problem Summary:
The existing reading method of
RowContainer(GetChunk(...)) is not fast enough for dumping a lot of rows from disk (for thecursorFetchuse case).The existing
Iterator4RowContaineris even slower, as it allocates a new chunk for each row 🤦.This PR is extracted from #44730 (with a some refractor).
What is changed and how it works?
This PR pipelines the IO and CPU calculation, to make full use of the IO bandwidth. It should also help other features using
rowContainer, asGetChunkis now much faster.The performance of existing benchmark
BenchmarkListInDisk_GetChunkincreases from2877471ns/opto462864ns/opCheck List
Tests