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5d634e7db6
This commit adds two new global options to kubectl: --profile and --profile-output, writing out go profiles to disk to debug interesting and unexpected kubectl behaviour. As an example, here is how to capture a block file, eg. for how long are we blocked on I/O and where? $ kubectl get nodes --profile=mutex -v6 $ go tool pprof -png ./profile.pprof > out.png $ google-chrome out.png Fixes: #68679
89 lines
2.0 KiB
Go
89 lines
2.0 KiB
Go
/*
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Copyright 2017 The Kubernetes 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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"fmt"
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"os"
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"runtime"
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"runtime/pprof"
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"github.com/spf13/pflag"
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)
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var (
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profileName string
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profileOutput string
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)
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func addProfilingFlags(flags *pflag.FlagSet) {
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flags.StringVar(&profileName, "profile", "none", "Name of profile to capture. One of (none|cpu|heap|goroutine|threadcreate|block|mutex)")
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flags.StringVar(&profileOutput, "profile-output", "profile.pprof", "Name of the file to write the profile to")
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}
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func initProfiling() error {
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switch profileName {
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case "none":
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return nil
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case "cpu":
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f, err := os.Create(profileOutput)
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if err != nil {
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return err
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}
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return pprof.StartCPUProfile(f)
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// Block and mutex profiles need a call to Set{Block,Mutex}ProfileRate to
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// output anything. We choose to sample all events.
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case "block":
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runtime.SetBlockProfileRate(1)
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return nil
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case "mutex":
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runtime.SetMutexProfileFraction(1)
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return nil
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default:
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// Check the profile name is valid.
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if profile := pprof.Lookup(profileName); profile == nil {
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return fmt.Errorf("unknown profile '%s'", profileName)
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}
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}
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return nil
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}
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func flushProfiling() error {
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switch profileName {
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case "none":
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return nil
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case "cpu":
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pprof.StopCPUProfile()
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case "heap":
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runtime.GC()
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fallthrough
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default:
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profile := pprof.Lookup(profileName)
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if profile == nil {
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return nil
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}
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f, err := os.Create(profileOutput)
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if err != nil {
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return err
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}
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profile.WriteTo(f, 0)
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}
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return nil
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}
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