eth/protocols, metrics: use resetting histograms for rare packets

This commit is contained in:
Péter Szilágyi 2021-03-26 16:14:12 +02:00
parent efe0229768
commit 2550e46269
No known key found for this signature in database
GPG Key ID: E9AE538CEDF8293D
3 changed files with 34 additions and 2 deletions

View File

@ -246,7 +246,11 @@ func handleMessage(backend Backend, peer *Peer) error {
if metrics.Enabled {
h := fmt.Sprintf("%s/%s/%d/%#02x", p2p.HandleHistName, ProtocolName, peer.Version(), msg.Code)
defer func(start time.Time) {
sampler := func() metrics.Sample { return metrics.NewExpDecaySample(1028, 0.015) }
sampler := func() metrics.Sample {
return metrics.ResettingSample(
metrics.NewExpDecaySample(1028, 0.015),
)
}
metrics.GetOrRegisterHistogramLazy(h, nil, sampler).Update(time.Since(start).Microseconds())
}(time.Now())
}

View File

@ -134,7 +134,11 @@ func handleMessage(backend Backend, peer *Peer) error {
if metrics.Enabled {
h := fmt.Sprintf("%s/%s/%d/%#02x", p2p.HandleHistName, ProtocolName, peer.Version(), msg.Code)
defer func(start time.Time) {
sampler := func() metrics.Sample { return metrics.NewExpDecaySample(1028, 0.015) }
sampler := func() metrics.Sample {
return metrics.ResettingSample(
metrics.NewExpDecaySample(1028, 0.015),
)
}
metrics.GetOrRegisterHistogramLazy(h, nil, sampler).Update(time.Since(start).Microseconds())
}(time.Now())
}

View File

@ -0,0 +1,24 @@
package metrics
// ResettingSample converts an ordinary sample into one that resets whenever its
// snapshot is retrieved. This will break for multi-monitor systems, but when only
// a single metric is being pushed out, this ensure that low-frequency events don't
// skew th charts indefinitely.
func ResettingSample(sample Sample) Sample {
return &resettingSample{
Sample: sample,
}
}
// resettingSample is a simple wrapper around a sample that resets it upon the
// snapshot retrieval.
type resettingSample struct {
Sample
}
// Snapshot returns a read-only copy of the sample with the original reset.
func (rs *resettingSample) Snapshot() Sample {
s := rs.Sample.Snapshot()
rs.Sample.Clear()
return s
}