mirror of
https://github.com/featurebasedb/featurebase.git
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97 lines
2.5 KiB
Go
97 lines
2.5 KiB
Go
// Copyright 2022 Molecula Corp. (DBA FeatureBase).
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// SPDX-License-Identifier: Apache-2.0
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package pilosa
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import (
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"fmt"
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"os"
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"runtime"
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"runtime/pprof"
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"time"
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_ "net/http/pprof" // Imported for its side-effect of registering pprof endpoints with the server.
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"github.com/featurebasedb/featurebase/v3/storage"
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"github.com/featurebasedb/featurebase/v3/vprint"
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)
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// CPUProfileForDur (where "Dur" is short for "Duration"), is used for
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// performance tuning during development. It's only called—but is currently
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// commented out—in holder.go.
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func CPUProfileForDur(dur time.Duration, outpath string) {
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// per-query pprof output:
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backend := storage.DefaultBackend
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path := outpath + "." + backend
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f, err := os.Create(path)
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vprint.PanicOn(err)
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if dur == 0 {
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dur = time.Minute
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}
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vprint.AlwaysPrintf("starting cpu profile for dur '%v', output to '%v'", dur, path)
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_ = pprof.StartCPUProfile(f)
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go func() {
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<-time.After(dur)
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pprof.StopCPUProfile()
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f.Close()
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vprint.AlwaysPrintf("stopping cpu profile after dur '%v', output: '%v'", dur, path)
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}()
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}
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// MemProfileForDur (where "Dur" is short for "Duration"), is used for
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// performance tuning during development. It's only called—but is currently
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// commented out—in holder.go.
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func MemProfileForDur(dur time.Duration, outpath string) {
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// per-query pprof output:
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backend := storage.DefaultBackend
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path := outpath + "." + backend
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f, err := os.Create(path)
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vprint.PanicOn(err)
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if dur == 0 {
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dur = time.Minute
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}
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vprint.AlwaysPrintf("will write memory profile after dur '%v', output to '%v'", dur, path)
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go func() {
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<-time.After(dur)
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runtime.GC() // get up-to-date statistics
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if err := pprof.WriteHeapProfile(f); err != nil {
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vprint.PanicOn(fmt.Sprintf("could not write memory profile: %v", err))
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}
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f.Close()
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vprint.AlwaysPrintf("wrote memory profile after dur '%v', output: '%v'", dur, path)
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}()
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}
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type pprofProfile struct {
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fdCpu *os.File
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}
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var _ = newPprof
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var _ = pprofProfile{}
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// for manually calling Close() to stop profiling.
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func newPprof() (pp *pprofProfile) {
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pp = &pprofProfile{}
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f, err := os.Create("cpu.manual.pprof")
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vprint.PanicOn(err)
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pp.fdCpu = f
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_ = pprof.StartCPUProfile(pp.fdCpu)
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return
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}
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func (pp *pprofProfile) Close() {
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pprof.StopCPUProfile()
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pp.fdCpu.Close()
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f, err := os.Create("mem.manual.pprof")
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vprint.PanicOn(err)
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runtime.GC() // get up-to-date statistics
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if err := pprof.WriteHeapProfile(f); err != nil {
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vprint.PanicOn(fmt.Sprintf("could not write memory profile: %v", err))
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}
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f.Close()
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}
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