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PreCalculateScalar consumes a lot of CPU when non-lite init stats #52343

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winoros opened this issue Apr 3, 2024 · 1 comment · Fixed by #52623
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PreCalculateScalar consumes a lot of CPU when non-lite init stats #52343

winoros opened this issue Apr 3, 2024 · 1 comment · Fixed by #52623
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affects-8.1 This bug affects the 8.1.x(LTS) versions. sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.

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winoros commented Apr 3, 2024

Enhancement

image

After #52342 is fixed, we found another CPU consumer.
Too many small obj are allocated and causing too much GC pressure.
@winoros winoros added type/enhancement The issue or PR belongs to an enhancement. sig/planner SIG: Planner labels Apr 3, 2024
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winoros commented Apr 3, 2024

And it's also a possible issue when we load needed histograms.

@winoros winoros mentioned this issue Apr 15, 2024
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ti-chi-bot bot pushed a commit that referenced this issue Apr 16, 2024
@winoros
statistics: reduce small obj alloc for PreCalculateScalar (#52623)
e5863e1 
close #52343
@ti-chi-bot ti-chi-bot mentioned this issue Apr 16, 2024
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@ti-chi-bot ti-chi-bot added the affects-8.1 This bug affects the 8.1.x(LTS) versions. label Apr 16, 2024
ti-chi-bot bot pushed a commit that referenced this issue Apr 17, 2024
@ti-chi-bot
statistics: reduce small obj alloc for PreCalculateScalar (#52623) (#…
c69f844 
…52652)

close #52343
@hawkingrei hawkingrei mentioned this issue Jun 20, 2024
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affects-8.1 This bug affects the 8.1.x(LTS) versions. sig/planner SIG: Planner type/enhancement The issue or PR belongs to an enhancement.
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statistics: reduce small obj alloc for PreCalculateScalar winoros/tidb
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