external/test: compare the performance of merge iter

[lance6716]

What problem does this PR solve?

Issue Number: close #xxx

Problem Summary:

What is changed and how it works?

generate the speed, CPU/heap profile for reading from external storage. See below.

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.

$ go test ./br/pkg/lightning/backend/external -v --tags=intest -test.run TestCompareReader --testing-storage-uri "s3://nfs/tianyuan-ut?access-key=xxx&secret-access-key=xxx&endpoint=https://xxx&force-path-style=false&region=xxx&provider=ks"
    bench_test.go:413: sequential read speed for 1258291200 bytes: 52.38 MB/s
    bench_test.go:420: concurrent read speed for 1258291200 bytes: 730.08 MB/s
    bench_test.go:427: merge iter read speed for 1258291200 bytes: 103.47 MB/s

The data is evenly distributed in files. We can see that even in this case merge iterator is slower than concurrent reading.

and here's the CPU flame graph of merge iter. We will improve the performance in future PR.

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.

None

[tiprow]

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[lance6716]

/cc @D3Hunter

[codecov]

Codecov Report

Merging #48560 (5d11739) into master (b1d2a75) will increase coverage by 1.3978%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #48560        +/-   ##
================================================
+ Coverage   71.4161%   72.8139%   +1.3978%     
================================================
  Files          1403       1427        +24     
  Lines        406992     413830      +6838     
================================================
+ Hits         290658     301326     +10668     
+ Misses        96390      93554      -2836     
+ Partials      19944      18950       -994     

Flag	Coverage Δ
integration	43.2712% <ø> (?)
unit	71.4258% <ø> (+0.0096%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
dumpling	53.9874% <ø> (ø)
parser	∅ <ø> (∅)
br	48.8063% <ø> (-4.2851%)	⬇️

[lance6716]

/cc @ywqzzy

[Benjamin2037]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Benjamin2037, D3Hunter

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-11-14 02:56:20.684333561 +0000 UTC m=+4131378.271443707: ☑️ agreed by D3Hunter.
• 2023-11-14 03:03:55.721749037 +0000 UTC m=+4131833.308859167: ☑️ agreed by Benjamin2037.