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app/vmagent/common: use plain sync.Pool instead of a mix of sync.Pool with channel-based pool for PushCtx

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This scheme was used for reducing memory usage when vmagent runs on a machine with big number of CPU cores
and the ingestion rate isn't too big. The scheme with channel-based pool could reduce memory usage,
since it minimizes the number of PushCtx structs in the pool in this case.

Performance tests didn't reveal significant difference in memory usage under both low and high ingestion rate
between plain sync.Pool and the current hybrid scheme, so replace the scheme with plain sync.Pool in order
to simplify the code.
This commit is contained in:
Aliaksandr Valialkin 2024-04-20 21:27:03 +02:00
parent 7531e9084a
commit 77c597738c
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GPG Key ID: 52C003EE2BCDB9EB
1 changed files with 7 additions and 15 deletions
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22
app/vmagent/common/push_ctx.go
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@ -3,13 +3,15 @@ package common
import (
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/cgroup"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/prompbmarshal"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/promrelabel"
)
// PushCtx is a context used for populating WriteRequest.
type PushCtx struct {
// WriteRequest contains the WriteRequest, which must be pushed later to remote storage.
//
// The actual labels and samples for the time series are stored in Labels and Samples fields.
WriteRequest prompbmarshal.WriteRequest
// Labels contains flat list of all the labels used in WriteRequest.
@ -33,15 +35,10 @@ func (ctx *PushCtx) Reset() {
//
// Call PutPushCtx when the ctx is no longer needed.
func GetPushCtx() *PushCtx {
select {
case ctx := <-pushCtxPoolCh:
return ctx
default:
if v := pushCtxPool.Get(); v != nil {
return v.(*PushCtx)
}
return &PushCtx{}
if v := pushCtxPool.Get(); v != nil {
return v.(*PushCtx)
}
return &PushCtx{}
}
// PutPushCtx returns ctx to the pool.
@ -49,12 +46,7 @@ func GetPushCtx() *PushCtx {
// ctx mustn't be used after returning to the pool.
func PutPushCtx(ctx *PushCtx) {
ctx.Reset()
select {
case pushCtxPoolCh <- ctx:
default:
pushCtxPool.Put(ctx)
}
pushCtxPool.Put(ctx)
}
var pushCtxPool sync.Pool
var pushCtxPoolCh = make(chan *PushCtx, cgroup.AvailableCPUs())