91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
/*
|
|
* Minio Cloud Storage, (C) 2019 Minio, 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 cpu
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
const (
|
|
// cpuLoadWindow is the interval of time for which the
|
|
// cpu utilization is measured
|
|
cpuLoadWindow = 200 * time.Millisecond
|
|
|
|
// cpuLoadSampleSize is the number of samples measured
|
|
// for calculating cpu utilization
|
|
cpuLoadSampleSize = 3
|
|
|
|
// endOfTime represents the end of time
|
|
endOfTime = time.Duration(1<<63 - 1)
|
|
)
|
|
|
|
// Load holds CPU utilization % measured in three intervals of 200ms each
|
|
type Load struct {
|
|
Avg string `json:"avg"`
|
|
Max string `json:"max"`
|
|
Min string `json:"min"`
|
|
Error string `json:"error,omitempty"`
|
|
}
|
|
|
|
type counter struct{}
|
|
|
|
// GetLoad returns the CPU utilization % of the current process
|
|
func GetLoad() Load {
|
|
vals := make(chan time.Duration, 3)
|
|
wg := sync.WaitGroup{}
|
|
for i := 0; i < cpuLoadSampleSize; i++ {
|
|
cpuCounter, err := newCounter()
|
|
if err != nil {
|
|
return Load{
|
|
Error: err.Error(),
|
|
}
|
|
}
|
|
wg.Add(1)
|
|
go func() {
|
|
start := cpuCounter.now()
|
|
time.Sleep(cpuLoadWindow)
|
|
end := cpuCounter.now()
|
|
vals <- end.Sub(start)
|
|
wg.Done()
|
|
}()
|
|
}
|
|
wg.Wait()
|
|
|
|
sum := time.Duration(0)
|
|
max := time.Duration(0)
|
|
min := (endOfTime)
|
|
for i := 0; i < cpuLoadSampleSize; i++ {
|
|
val := <-vals
|
|
sum = sum + val
|
|
if val > max {
|
|
max = val
|
|
}
|
|
if val < min {
|
|
min = val
|
|
}
|
|
}
|
|
close(vals)
|
|
avg := sum / 3
|
|
return Load{
|
|
Avg: fmt.Sprintf("%.2f%%", toFixed4(float64(avg)/float64(200*time.Millisecond))*100),
|
|
Max: fmt.Sprintf("%.2f%%", toFixed4(float64(max)/float64(200*time.Millisecond))*100),
|
|
Min: fmt.Sprintf("%.2f%%", toFixed4(float64(min)/float64(200*time.Millisecond))*100),
|
|
Error: "",
|
|
}
|
|
}
|