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runtime/metrics: add CPU stats

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This changes adds a breakdown for estimated CPU usage by time. These
estimates are not based on real on-CPU counters, so each metric has a
disclaimer explaining so. They can, however, be more reasonably
compared to a total CPU time metric that this change also adds.

Fixes #47216.

Change-Id: I125006526be9f8e0d609200e193da5a78d9935be
Reviewed-on: https://go-review.googlesource.com/c/go/+/404307
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Josh MacDonald <jmacd@lightstep.com>
Auto-Submit: Michael Knyszek <mknyszek@google.com>
Reviewed-by: David Chase <drchase@google.com>
Run-TryBot: Michael Knyszek <mknyszek@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Michael Anthony Knyszek 2022-05-06 20:11:28 +00:00 • committed by Gopher Robot
parent 87eda2a782
commit b7c28f484d
11 changed files with 459 additions and 21 deletions
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98
src/runtime/metrics.go
View file

@ -90,6 +90,83 @@ func initMetrics() {
out.scalar = uint64(NumCgoCall())
},
},
"/cpu/classes/gc/mark/assist:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.gcAssistTime))
},
},
"/cpu/classes/gc/mark/dedicated:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.gcDedicatedTime))
},
},
"/cpu/classes/gc/mark/idle:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.gcIdleTime))
},
},
"/cpu/classes/gc/pause:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.gcPauseTime))
},
},
"/cpu/classes/gc/total:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.gcTotalTime))
},
},
"/cpu/classes/idle:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.idleTime))
},
},
"/cpu/classes/scavenge/assist:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.scavengeAssistTime))
},
},
"/cpu/classes/scavenge/background:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.scavengeBgTime))
},
},
"/cpu/classes/scavenge/total:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.scavengeTotalTime))
},
},
"/cpu/classes/total:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.totalTime))
},
},
"/cpu/classes/user:cpu-seconds": {
deps: makeStatDepSet(cpuStatsDep),
compute: func(in *statAggregate, out *metricValue) {
out.kind = metricKindFloat64
out.scalar = float64bits(nsToSec(in.cpuStats.userTime))
},
},
"/gc/cycles/automatic:gc-cycles": {
deps: makeStatDepSet(sysStatsDep),
compute: func(in *statAggregate, out *metricValue) {
@ -345,6 +422,7 @@ type statDep uint
const (
heapStatsDep statDep = iota // corresponds to heapStatsAggregate
sysStatsDep // corresponds to sysStatsAggregate
cpuStatsDep // corresponds to cpuStatsAggregate
numStatsDeps
)
@ -490,6 +568,23 @@ func (a *sysStatsAggregate) compute() {
})
}
// cpuStatsAggregate represents CPU stats obtained from the runtime
// acquired together to avoid skew and inconsistencies.
type cpuStatsAggregate struct {
cpuStats
}
// compute populates the cpuStatsAggregate with values from the runtime.
func (a *cpuStatsAggregate) compute() {
a.cpuStats = work.cpuStats
}
// nsToSec takes a duration in nanoseconds and converts it to seconds as
// a float64.
func nsToSec(ns int64) float64 {
return float64(ns) / 1e9
}
// statAggregate is the main driver of the metrics implementation.
//
// It contains multiple aggregates of runtime statistics, as well
@ -499,6 +594,7 @@ type statAggregate struct {
ensured statDepSet
heapStats heapStatsAggregate
sysStats sysStatsAggregate
cpuStats cpuStatsAggregate
}
// ensure populates statistics aggregates determined by deps if they
@ -517,6 +613,8 @@ func (a *statAggregate) ensure(deps *statDepSet) {
a.heapStats.compute()
case sysStatsDep:
a.sysStats.compute()
case cpuStatsDep:
a.cpuStats.compute()
}
}
a.ensured = a.ensured.union(missing)