mirror of https://github.com/pulumi/pulumi.git
95 lines
2.6 KiB
Go
95 lines
2.6 KiB
Go
// Copyright 2016-2018, Pulumi Corporation.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package cmdutil
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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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"runtime/trace"
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"time"
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"github.com/pulumi/pulumi/sdk/v3/go/common/util/contract"
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)
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func InitProfiling(prefix string, memProfileRate int) error {
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cpu, err := os.Create(fmt.Sprintf("%s.%v.cpu", prefix, os.Getpid()))
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if err != nil {
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return fmt.Errorf("could not start CPU profile: %w", err)
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}
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if err = pprof.StartCPUProfile(cpu); err != nil {
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return fmt.Errorf("could not start CPU profile: %w", err)
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}
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exec, err := os.Create(fmt.Sprintf("%s.%v.trace", prefix, os.Getpid()))
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if err != nil {
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return fmt.Errorf("could not start execution trace: %w", err)
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}
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if err = trace.Start(exec); err != nil {
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return fmt.Errorf("could not start execution trace: %w", err)
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}
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if memProfileRate > 0 {
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runtime.MemProfileRate = memProfileRate
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go memoryProfileWriteLoop(prefix)
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}
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return nil
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}
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func CloseProfiling(prefix string) error {
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pprof.StopCPUProfile()
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trace.Stop()
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// get up-to-date statistics
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return writeMemoryProfile(prefix)
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}
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func writeMemoryProfile(prefix string) error {
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mem, err := os.Create(fmt.Sprintf("%s.%v.mem", prefix, os.Getpid()))
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if err != nil {
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return fmt.Errorf("could not create memory profile: %w", err)
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}
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defer contract.IgnoreClose(mem)
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runtime.GC()
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if err = pprof.Lookup("allocs").WriteTo(mem, 0); err != nil {
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return fmt.Errorf("could not write memory profile: %w", err)
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}
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return nil
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}
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func memoryProfileWriteLoop(prefix string) {
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// Every 5 seconds write a memory profile (in case we crash before we get a chance)
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for i := 0; ; i++ {
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time.Sleep(5 * time.Second)
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mem, err := os.Create(fmt.Sprintf("%s.%v.mem.%d", prefix, os.Getpid(), i))
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if err != nil {
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fmt.Fprintf(os.Stderr, "could not create memory profile: %s\n", err.Error())
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return
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}
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defer mem.Close()
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runtime.GC() // get up-to-date statistics
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if err = pprof.Lookup("allocs").WriteTo(mem, 0); err != nil {
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fmt.Fprintf(os.Stderr, "could not create memory profile: %s\n", err.Error())
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}
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os.Remove(fmt.Sprintf("%s.%v.mem.%d", prefix, os.Getpid(), i-1))
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}
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}
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