68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
// Package profile provides an extension to generate profile data from k6 itself.
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//
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// An Output extension is used to leverage the Start and Stop hooks which are
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// otherwise inaccessible in a regular module.
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package profile
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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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"go.k6.io/k6/metrics"
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"go.k6.io/k6/output"
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)
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const (
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cpuProfilePath = "cpu.prof"
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memProfilePath = "mem.prof"
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)
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type profExt struct {
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cpuFile *os.File
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}
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func New(output.Params) (output.Output, error) {
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return &profExt{}, nil
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}
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func (*profExt) Description() string {
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return "profile"
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}
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func (ext *profExt) Start() error {
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var err error
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ext.cpuFile, err = os.Create(cpuProfilePath)
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if err != nil {
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return fmt.Errorf("creating cpu profile file: %v", err)
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}
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if err := pprof.StartCPUProfile(ext.cpuFile); err != nil {
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return fmt.Errorf("starting cpu profile: %v", err)
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}
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return nil
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}
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func (ext *profExt) Stop() error {
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pprof.StopCPUProfile()
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if err := ext.cpuFile.Close(); err != nil {
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return fmt.Errorf("closing cpu profile file: %v", err)
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}
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f, err := os.Create(memProfilePath)
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if err != nil {
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return fmt.Errorf("creating mem profile file: %v", err)
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}
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defer f.Close()
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runtime.GC()
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if err := pprof.WriteHeapProfile(f); err != nil {
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return fmt.Errorf("writing mem profile: %v", err)
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}
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return nil
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}
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func (*profExt) AddMetricSamples([]metrics.SampleContainer) {}
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func init() {
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output.RegisterExtension("profile", New)
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}
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