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92 lines
2.2 KiB
92 lines
2.2 KiB
/*
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Copyright The Helm Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cmd
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import (
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"errors"
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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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)
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var (
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cpuProfileFile *os.File
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cpuProfilePath string
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memProfilePath string
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)
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func init() {
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cpuProfilePath = os.Getenv("HELM_PPROF_CPU_PROFILE")
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memProfilePath = os.Getenv("HELM_PPROF_MEM_PROFILE")
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}
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// startProfiling starts profiling CPU usage if HELM_PPROF_CPU_PROFILE is set
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// to a file path. It returns an error if the file could not be created or
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// CPU profiling could not be started.
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func startProfiling() error {
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if cpuProfilePath != "" {
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var err error
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cpuProfileFile, err = os.Create(cpuProfilePath)
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if err != nil {
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return fmt.Errorf("could not create CPU profile: %w", err)
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}
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if err := pprof.StartCPUProfile(cpuProfileFile); err != nil {
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cpuProfileFile.Close()
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cpuProfileFile = nil
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return fmt.Errorf("could not start CPU profile: %w", err)
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}
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}
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return nil
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}
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// stopProfiling stops profiling CPU and memory usage.
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// It writes memory profile to the file path specified in HELM_PPROF_MEM_PROFILE
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// environment variable.
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func stopProfiling() error {
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errs := []error{}
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// Stop CPU profiling if it was started
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if cpuProfileFile != nil {
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pprof.StopCPUProfile()
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err := cpuProfileFile.Close()
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if err != nil {
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errs = append(errs, err)
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}
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cpuProfileFile = nil
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}
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if memProfilePath != "" {
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f, err := os.Create(memProfilePath)
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if err != nil {
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errs = append(errs, err)
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}
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defer f.Close()
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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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errs = append(errs, err)
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}
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}
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if err := errors.Join(errs...); err != nil {
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return fmt.Errorf("error(s) while stopping profiling: %w", err)
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}
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return nil
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}
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