Storages: Splitting DMFileReaderPool to reduce lock contention (#9126)

[ti-chi-bot]

This is an automated cherry-pick of #9126

What problem does this PR solve?

Issue Number: close #9125

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  • Run simple queries (select max(k) from sbtest1) concurrently.
  • Time consumption unit: ms.

Concurrency	Master	This PR
1	27	25
2	28	29
4	46	46
8	72	77
16	124	97
32	232	160
64	450	327

• 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 the short queries performance under high concurrency by reducing the lock contention

[JinheLin]

/test

[ti-chi-bot]

@JinheLin: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test

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[JinheLin]

/run-all-tests

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JaySon-Huang, JinheLin

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• OWNERS [JaySon-Huang,JinheLin]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-06-07 06:00:20.125255474 +0000 UTC m=+98774.178567397: ☑️ agreed by JaySon-Huang.
• 2024-06-07 06:30:47.792236138 +0000 UTC m=+100601.845548062: ☑️ agreed by JinheLin.