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main.go
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main.go
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// Copyright 2023 The Kubernetes Authors.
//
// 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 main
import (
"flag"
"fmt"
"time"
"github.com/spf13/cobra"
)
var (
options = Options{}
rootCmd = &cobra.Command{
Use: "test-app",
Run: options.Run,
Short: `test-app simulates an application using cpu and memory.`,
}
)
// RunE this application and return error if any
func (o *Options) Run(_ *cobra.Command, _ []string) {
for i := 0; i < o.MemoryByteBufferCount; i++ {
go func() {
for {
// allocate memory in a continuos loop
memory := make([]byte, o.MemoryByteBufferSize)
time.Sleep(time.Duration(o.MemorySleepSec) * time.Second)
fmt.Println(len(memory))
// free the memory
memory = nil
}
}()
}
// spin up go routines that spin endlessly
sleep := time.NewTicker(time.Duration(o.CPUSleepFrequencySec) * time.Second)
for i := 0; i < o.CPUGoRoutines; i++ {
go func() {
for {
select {
case <-sleep.C:
time.Sleep(time.Duration(o.CPUSleepSec) * time.Second)
default:
}
}
}()
}
// block forever
for {
time.Sleep(time.Hour)
}
}
// Options is set by flags
type Options struct {
MemorySleepSec float32 `json:"memorySleepSec"`
MemoryByteBufferSize int `json:"memoryByteBufferSize"`
MemoryByteBufferCount int `json:"memoryByteBufferCount"`
CPUSleepSec float32 `json:"cpuSleepSec"`
CPUSleepFrequencySec float32 `json:"cpuSleepFrequencySec"`
CPUGoRoutines int `json:"cpuGoRoutines"`
}
func main() {
// Add the go `flag` package flags -- e.g. `--kubeconfig`
rootCmd.Flags().AddGoFlagSet(flag.CommandLine)
rootCmd.Flags().IntVar(&options.CPUGoRoutines, "cpu-go-routines", 1, "number of concurrent go-routines")
rootCmd.Flags().Float32Var(&options.CPUSleepFrequencySec, "cpu-sleep-sec-frequency", 1.0, "how frequently to send a sleep signal to one of the go routines")
rootCmd.Flags().Float32Var(&options.CPUSleepSec, "cpu-sleep-sec", 0.1, "how long to sleep for")
rootCmd.Flags().IntVar(&options.MemoryByteBufferCount, "memory-go-routines", 1, "number of byte buffers to allocated")
rootCmd.Flags().IntVar(&options.MemoryByteBufferSize, "memory-byte-buffer-size", 1000, "size of each byte buffer")
rootCmd.Flags().Float32Var(&options.MemorySleepSec, "memory-sleep-sec", 1.0, "how long to sleep for between memory allocations")
if err := rootCmd.Execute(); err != nil {
panic(err)
}
}