// Copyright 2020 PingCAP, Inc. // // 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, // See the License for the specific language governing permissions and // limitations under the License. package util import ( "os" "runtime/debug" "strconv" "sync/atomic" "github.com/pingcap/tidb/metrics" ) var gogcValue int64 func init() { gogcValue = 100 if val, err := strconv.Atoi(os.Getenv("GOGC")); err == nil { gogcValue = int64(val) } metrics.GOGC.Set(float64(gogcValue)) } // SetGOGC update GOGC and related metrics. func SetGOGC(val int) { if val <= 0 { val = 100 } debug.SetGCPercent(val) metrics.GOGC.Set(float64(val)) atomic.StoreInt64(&gogcValue, int64(val)) } // GetGOGC returns the current value of GOGC. func GetGOGC() int { return int(atomic.LoadInt64(&gogcValue)) }