// Copyright 2016-2018, Pulumi Corporation. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package cmdutil import ( "fmt" "os" "runtime" "runtime/pprof" "runtime/trace" "github.com/pulumi/pulumi/sdk/v3/go/common/util/contract" ) func InitProfiling(prefix string, memProfileRate int) error { cpu, err := os.Create(fmt.Sprintf("%s.%v.cpu", prefix, os.Getpid())) if err != nil { return fmt.Errorf("could not start CPU profile: %w", err) } if err = pprof.StartCPUProfile(cpu); err != nil { return fmt.Errorf("could not start CPU profile: %w", err) } exec, err := os.Create(fmt.Sprintf("%s.%v.trace", prefix, os.Getpid())) if err != nil { return fmt.Errorf("could not start execution trace: %w", err) } if err = trace.Start(exec); err != nil { return fmt.Errorf("could not start execution trace: %w", err) } if memProfileRate > 0 { runtime.MemProfileRate = memProfileRate } return nil } func CloseProfiling(prefix string) error { pprof.StopCPUProfile() trace.Stop() mem, err := os.Create(fmt.Sprintf("%s.%v.mem", prefix, os.Getpid())) if err != nil { return fmt.Errorf("could not create memory profile: %w", err) } defer contract.IgnoreClose(mem) runtime.GC() // get up-to-date statistics if err = pprof.Lookup("allocs").WriteTo(mem, 0); err != nil { return fmt.Errorf("could not write memory profile: %w", err) } return nil }