pingcap/tidb

use hack.Slice in ColumnInfo:Dump to avoid unnecessary `string to slice` conversation

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#32.073 aperta il 30 gen 2022

 (3 commenti) (1 reazione) (1 assegnatario)Go (6186 fork)batch import
help wantedtype/enhancementtype/performance

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Descrizione

Enhancement

In some read-heavy workloads, we found that Column Dump causes some CPUs

image

Through the flamegraph, we can see that nearly 1% of CPU is caused by string to slice conversation. We can ensure that we don't change the slice value in the Dump function, https://github.com/pingcap/tidb/blob/master/server/column.go#L41, so we can use hack.Slice instead.

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