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global sort 120T test seekPropsOffsets performance problems #51639

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lance6716 opened this issue Mar 11, 2024 · 0 comments · Fixed by #51676
Closed

global sort 120T test seekPropsOffsets performance problems #51639

lance6716 opened this issue Mar 11, 2024 · 0 comments · Fixed by #51676
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@lance6716
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Enhancement

When seekPropsOffsets need to handle 2800 files

[reader.go:43] [arguments] [data-file-count=2800] [stat-file-count=2800] [start-key=dIAAAAAAAABoX3IBNzAxMzk2ODj/OTFzSlFORW3/SzE4ckM0Nk//RVY1WFZzYTH/dDFZcGYwQVT/a1kAAAAAAAD5] [end-key=dIAAAAAAAABoX3IBNzAxNDEwOTf/N1ZmbVhBVTf/TENBUjlxYlP/Q1Z0ZjBIOWj/SlRWWU5uVm3/WgAAAAAAAAD4]

The single thread heap-based merge sort becomes bottleneck

image
image

as @wjhuang2016 suggested, we should find a more parallel way to handle it, like readAllData
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external: parallel seekPropsOffsets lance6716/tidb
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