variables: Increase default innodb_buffer_pool_size to 4GiB

[sunxiaoguang]

What problem does this PR solve?

Issue Number: close #57459

Problem Summary: Some applications are complaining that the innodb_buffer_pool_size is too small. Since it doesn't affect any logic in TiDB, we can safely increase the default value so it will work out of box in this situation

What changed and how does it work?

Check List

Tests

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

  • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

The noop global variable innodb_buffer_pool_size is increased to 4GiB 

[tiprow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.5994%. Comparing base (a22b842) to head (c3ce4df).
Report is 9 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #57460        +/-   ##
================================================
+ Coverage   72.8488%   73.5994%   +0.7505%     
================================================
  Files          1672       1672                
  Lines        462666     464751      +2085     
================================================
+ Hits         337047     342054      +5007     
+ Misses       104821     101916      -2905     
+ Partials      20798      20781        -17     

Flag	Coverage Δ
integration	43.6553% <ø> (?)
unit	72.4234% <ø> (+0.2017%)	⬆️

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Components	Coverage Δ
dumpling	52.7673% <ø> (ø)
parser	∅ <ø> (∅)
br	45.1962% <ø> (+0.0736%)	⬆️

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dveeden, hawkingrei

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-11-18 08:59:10.163911328 +0000 UTC m=+865112.354780326: ☑️ agreed by hawkingrei.
• 2024-11-18 17:48:18.480478389 +0000 UTC m=+896860.671347384: ☑️ agreed by dveeden.

[dveeden]

/ok-to-test

[dveeden]

/retest