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Copy pathmem.go
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68 lines (60 loc) · 1.76 KB
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/*
* 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 mem
import (
"runtime"
"time"
)
// historicUsage holds the rolling average of memory used by
// minio server
var historicUsage *Usage
// memUsageMeasureInterval is the window of time between
// two measurements of memory usage
const memUsageMeasureInterval = 5 * time.Second
// triggers the collection of historic stats about the memory
// utilized by minio server
func init() {
historicUsage = &Usage{}
var cycles uint64
go func() {
for {
time.Sleep(memUsageMeasureInterval)
currUsage := GetUsage()
currSum := cycles * historicUsage.Mem
cycles = cycles + 1
historicUsage.Mem = (currSum + currUsage.Mem) / cycles
}
}()
}
// Usage holds memory utilization information in human readable format
type Usage struct {
Mem uint64 `json:"mem"`
Error string `json:"error,omitempty"`
}
// GetHistoricUsage measures the historic average of memory utilized by
// current process
func GetHistoricUsage() Usage {
return *historicUsage
}
// GetUsage measures the total memory provisioned for the current process
// from the OS
func GetUsage() Usage {
memStats := new(runtime.MemStats)
runtime.ReadMemStats(memStats)
return Usage{
Mem: memStats.Sys,
}
}