40 lines
1.2 KiB
Go
40 lines
1.2 KiB
Go
// Copyright 2022 PingCAP, Inc.
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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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//go:build linux || darwin || freebsd || unix
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package util
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import (
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"syscall"
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"time"
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)
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var (
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lastInspectUnixNano int64
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lastCPUUsageTime int64
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)
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// GetCPUPercentage calculates CPU usage and returns percentage in float64(e.g. 2.5 means 2.5%).
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// http://man7.org/linux/man-pages/man2/getrusage.2.html
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func GetCPUPercentage() float64 {
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var ru syscall.Rusage
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_ = syscall.Getrusage(syscall.RUSAGE_SELF, &ru)
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usageTime := ru.Utime.Nano() + ru.Stime.Nano()
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nowTime := time.Now().UnixNano()
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perc := float64(usageTime-lastCPUUsageTime) / float64(nowTime-lastInspectUnixNano) * 100.0
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lastInspectUnixNano = nowTime
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lastCPUUsageTime = usageTime
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return perc
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}
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