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mutex_profile.go
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mutex_profile.go
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// Copyright 2016 The Cockroach Authors.
//
// 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.
// +build go1.8
package cli
import (
"runtime"
"github.com/cockroachdb/cockroach/pkg/util/envutil"
)
func init() {
// Enable the mutex profile for a fraction of mutex contention events.
// Smaller values provide more accurate profiles but are more expensive. 0
// and 1 are special: 0 disables the mutex profile and 1 captures 100% of
// mutex contention events. For other values, the profiler will sample on
// average 1/X events.
//
// The mutex profile can be viewed with `pprof http://HOST:PORT/debug/pprof/mutex`
runtime.SetMutexProfileFraction(envutil.EnvOrDefaultInt("COCKROACH_MUTEX_PROFILE_RATE", 0))
}