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executor: improve UnionScanRead performance #32668

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merged 11 commits into from Apr 1, 2022
Merged

executor: improve UnionScanRead performance #32668

merged 11 commits into from Apr 1, 2022

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Defined2014
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@Defined2014 Defined2014 commented Feb 28, 2022 •
edited

What problem does this PR solve?

Issue Number: ref #32433

Problem Summary:

What is changed and how it works?

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

improve UnionScan performance

performance result

init
BenchmarkUnionScanRead-8   	     100	  10660929 ns/op	 6959025 B/op	  129133 allocs/op

global rows + encodeOldDatum
BenchmarkUnionScanRead-8   	     128	   9252419 ns/op	 2477990 B/op	   73130 allocs/op

add DecodeColumnValueWithDatum (if inline DecodeColumnValue will reach to 140)
BenchmarkUnionScanRead-8   	     134	   8870363 ns/op	 2477740 B/op	   73130 allocs/op

add m.offsets
BenchmarkUnionScanRead-8   	     146	   8143259 ns/op	 2477456 B/op	   73130 allocs/op

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ti-chi-bot commented Feb 28, 2022 •
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[REVIEW NOTIFICATION]

This pull request has been approved by:

  • tiancaiamao
  • xhebox

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
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@ti-chi-bot ti-chi-bot added release-note size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Feb 28, 2022
@ti-chi-bot ti-chi-bot added size/S Denotes a PR that changes 10-29 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Feb 28, 2022
@Defined2014 Defined2014 changed the title executor: reuse slice in memTableReader [WIP] executor: reuse slice in memTableReader Feb 28, 2022
@ti-chi-bot ti-chi-bot added the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Feb 28, 2022
@ti-chi-bot ti-chi-bot added size/M Denotes a PR that changes 30-99 lines, ignoring generated files. and removed size/S Denotes a PR that changes 10-29 lines, ignoring generated files. labels Mar 1, 2022
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sre-bot commented Mar 1, 2022 •
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Code Coverage Details: https://codecov.io/github/pingcap/tidb/commit/82a5f102a46f9975324678dab434416cc09540ca

@Defined2014 Defined2014 changed the title [WIP] executor: reuse slice in memTableReader [WIP] executor: improve UnionScanRead performance Mar 1, 2022
@Defined2014 Defined2014 changed the title [WIP] executor: improve UnionScanRead performance executor: improve UnionScanRead performance Mar 1, 2022
@ti-chi-bot ti-chi-bot removed the do-not-merge/work-in-progress Indicates that a PR should not merge because it is a work in progress. label Mar 1, 2022
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/cc @tiancaiamao
PTAL.

tiancaiamao
tiancaiamao reviewed Mar 10, 2022
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tiancaiamao approved these changes Mar 30, 2022
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The encoding/decoding code here is still not good enough...
If I get a time, I'd rather rewrite it totally.

@ti-chi-bot ti-chi-bot added the status/LGT1 Indicates that a PR has LGTM 1. label Mar 30, 2022
@Defined2014 Defined2014 added the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Mar 30, 2022
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/cc @xhebox @bb7133
PTAL

@ti-chi-bot ti-chi-bot added status/LGT2 Indicates that a PR has LGTM 2. and removed status/LGT1 Indicates that a PR has LGTM 1. labels Mar 31, 2022
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xhebox commented Mar 31, 2022

/merge

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This pull request has been accepted and is ready to merge.

Commit hash: 92b1764

@ti-chi-bot ti-chi-bot added the status/can-merge Indicates a PR has been approved by a committer. label Mar 31, 2022
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/run-unit-test

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/run-mysql-test

@Defined2014 Defined2014 removed the do-not-merge/hold Indicates that a PR should not merge because someone has issued a /hold command. label Apr 1, 2022
@ti-chi-bot ti-chi-bot merged commit 17a9fc4 into pingcap:master Apr 1, 2022
@Defined2014 Defined2014 deleted the 32433 branch April 1, 2022 03:06
@tiancaiamao tiancaiamao mentioned this pull request Apr 8, 2022
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@tiancaiamao tiancaiamao tiancaiamao approved these changes

@xhebox xhebox xhebox approved these changes

@bb7133 bb7133 Awaiting requested review from bb7133

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