tidb gogc 源码
tidb gogc 代码
文件路径：/util/gogc.go
// 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,
// 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 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))
}
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