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sessionctx: fix tidb_gogc_tuner_threshold #38851

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merged 8 commits into from
Nov 3, 2022
Merged

sessionctx: fix tidb_gogc_tuner_threshold #38851

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51f33de
sessionctx: fix tidb_gogc_tuner_threshold when tidb_server_memory_lim…
hawkingrei Nov 3, 2022
03e1fde
sessionctx: fix tidb_gogc_tuner_threshold when tidb_server_memory_lim…
hawkingrei Nov 3, 2022
90bc5f8
fix building
hawkingrei Nov 3, 2022
6261687
Merge branch 'master' into gogctuner_value
hawkingrei Nov 3, 2022
ce1ae22
Merge branch 'master' into gogctuner_value
ti-chi-bot Nov 3, 2022
a3ea786
Merge branch 'master' into gogctuner_value
ti-chi-bot Nov 3, 2022
b1cadfa
Merge branch 'master' into gogctuner_value
hawkingrei Nov 3, 2022
1619e5f
fix building
hawkingrei Nov 3, 2022
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8 changes: 7 additions & 1 deletion sessionctx/variable/sysvar.go
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Original file line number Diff line number Diff line change
Expand Up @@ -748,10 +748,16 @@ var defaultSysVars = []*SysVar{
}
return strconv.FormatFloat(floatValue, 'f', -1, 64), nil
},
SetGlobal: func(_ context.Context, s *SessionVars, val string) error {
SetGlobal: func(_ context.Context, s *SessionVars, val string) (err error) {
factor := tidbOptFloat64(val, DefTiDBGOGCTunerThreshold)
GOGCTunerThreshold.Store(factor)
memTotal := memory.ServerMemoryLimit.Load()
if memTotal == 0 {
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memTotal, err = memory.MemTotal()
if err != nil {
return err
}
}
threshold := float64(memTotal) * factor
gctuner.Tuning(uint64(threshold))
return nil
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