k8s.io/kubernetes@v1.29.3/test/images/resource-consumer/consume-cpu/consume_cpu_windows.go (about)

     1  //go:build windows
     2  // +build windows
     3  
     4  /*
     5  Copyright 2021 The Kubernetes Authors.
     6  
     7  Licensed under the Apache License, Version 2.0 (the "License");
     8  you may not use this file except in compliance with the License.
     9  You may obtain a copy of the License at
    10  
    11      http://www.apache.org/licenses/LICENSE-2.0
    12  
    13  Unless required by applicable law or agreed to in writing, software
    14  distributed under the License is distributed on an "AS IS" BASIS,
    15  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    16  See the License for the specific language governing permissions and
    17  limitations under the License.
    18  */
    19  
    20  package main
    21  
    22  import (
    23  	"flag"
    24  	"syscall"
    25  	"time"
    26  
    27  	syswin "golang.org/x/sys/windows"
    28  )
    29  
    30  type procCPUStats struct {
    31  	User   int64     // nanoseconds spent in user mode
    32  	System int64     // nanoseconds spent in system mode
    33  	Time   time.Time // when the sample was taken
    34  	Total  int64     // total of all time fields (nanoseconds)
    35  }
    36  
    37  // Retrieves the amount of CPU time this process has used since it started.
    38  func statsNow(handle syscall.Handle) (s procCPUStats) {
    39  	var processInfo syscall.Rusage
    40  	syscall.GetProcessTimes(handle, &processInfo.CreationTime, &processInfo.ExitTime, &processInfo.KernelTime, &processInfo.UserTime)
    41  	s.Time = time.Now()
    42  	s.User = processInfo.UserTime.Nanoseconds()
    43  	s.System = processInfo.KernelTime.Nanoseconds()
    44  	s.Total = s.User + s.System
    45  	return s
    46  }
    47  
    48  // Given stats from two time points, calculates the millicores used by this
    49  // process between the two samples.
    50  func usageNow(first procCPUStats, second procCPUStats) int64 {
    51  	dT := second.Time.Sub(first.Time).Nanoseconds()
    52  	dUsage := (second.Total - first.Total)
    53  	if dT == 0 {
    54  		return 0
    55  	}
    56  	return 1000 * dUsage / dT
    57  }
    58  
    59  func main() {
    60  	flag.Parse()
    61  	phandle, err := syswin.GetCurrentProcess()
    62  	if err != nil {
    63  		panic(err)
    64  	}
    65  	handle := syscall.Handle(phandle)
    66  
    67  	duration := time.Duration(*durationSec) * time.Second
    68  	start := time.Now()
    69  	first := statsNow(handle)
    70  	for time.Since(start) < duration {
    71  		currentMillicores := usageNow(first, statsNow(handle))
    72  		if currentMillicores < int64(*millicores) {
    73  			doSomething()
    74  		} else {
    75  			time.Sleep(sleep)
    76  		}
    77  	}
    78  }