人为提升服务器CPU、内存、硬盘使用率

一、CPU使用率

vikyd/go-cpu-load: Generate CPU load on Windows/Linux/Mac (github.com)

所有CPU核心负载30%运行10秒钟

./cpu -p 30 -t 10

所有CPU核心负载30%持续运行

./cpu -p 30

后台运行，CPU使用率不低于20%

nohup ./cpu -p 21 >> cpu.log 2>&1 &

只让2个CPU核心负载30%运行10秒钟

./cpu -p 30 -c 2 -t 10

• all CPU load = (num of para c _ num of p) / (all cores count of CPU _ 100)
• may not specify cores run the load only, it just promise the all CPU load, and not promise each cores run the same load

参数

--coresCount value, -c value   how many cores (optional, default: 8)

--timeSeconds value, -t value  how long (optional, default: 2147483647)

--percentage value, -p value   percentage of each specify cores (required)

--help, -h                     show help

源代码

package main

import (
	"log"
	"os"
	"runtime"

	cli "github.com/urfave/cli/v2"
)

// EINVAL Error Code: #define EINVAL          22      /* Invalid argument */
const EINVAL = 23

const maxInt32 = 2147483647
const unLimitedTime = maxInt32
const missPercentageVal = 0

func main() {
	var coresCount int
	var timeSeconds int
	var percentage int

	app := cli.NewApp()

	// app.Version = "0.0.2"

	app.Flags = []cli.Flag{
		&cli.IntFlag{
			Name:        "coresCount",
			Aliases:     []string{"c"},
			Value:       runtime.NumCPU(),
			Usage:       "how many cores",
			Destination: &coresCount,
		},
		&cli.IntFlag{
			Name:        "timeSeconds",
			Aliases:     []string{"t"},
			Value:       unLimitedTime,
			Usage:       "how long",
			Destination: &timeSeconds,
		},
		&cli.IntFlag{
			Name:        "percentage",
			Aliases:     []string{"p"},
			Value:       missPercentageVal,
			Usage:       "percentage of each specify cores",
			Destination: &percentage,
		},
	}

	app.Action = func(c *cli.Context) error {
		// fmt.Println("coresCount: ", coresCount)
		// fmt.Println("timeSeconds: ", timeSeconds)
		// fmt.Println("percentage: ", percentage)
		// fmt.Println("------")

		if coresCount < 1 || coresCount > runtime.NumCPU() {
			return cli.NewExitError("coresCount not correct must between 1 - `max CPU cores`", EINVAL)
		}

		if timeSeconds <= 0 {
			return cli.NewExitError("timeSeconds not correct must be positive int", EINVAL)
		}

		if percentage <= 0 || percentage > 100 {
			return cli.NewExitError("percentage must between 1 - 100", EINVAL)
		}
		RunCPULoad(coresCount, timeSeconds, percentage)
		return nil
	}

	err := app.Run(os.Args)
	if err != nil {
		log.Fatal(err)
	}
}

二、内存使用率

robert-mcdermott/memoryleaker: A utility that simulates a memory leak for testing and diagnostic purposes. (github.com)

快速进行内存泄露至2GB

$ ./memory -d 5 -l 2048
Leaked: 2048 MiB ███████▒▒▒
Holding at 2048 MiB

后台运行内存泄露至13GB

nohup ./memory -l 13312 >> memory.log 2>&1 &

参数

./memory [-d <泄露延迟 ms; 默认 100>]

  -d int    选项: 调整泄漏率的延迟（毫秒）; 默认 100ms

  -l int    选项: 内存泄漏上限 (MiB); 默认无上限

源代码

// A utility simulates a memory leak for testing, diagnostic purposes
package main

import (
	"flag"
	"fmt"
	"os"
	"runtime"
	"runtime/debug"
	"time"

	"github.com/briandowns/spinner"
)

func main() {
	// define and set default command parameter flags
	var dFlag = flag.Int("d", 100, "Optional: delay is ms to adjust the leak rate; default is 100")
	var lFlag = flag.Int("l", 1048576, "Optional: limit the leak to this many MiBs")
	var hFlag = flag.Bool("h", false, "print usage information")

	// usage function that's executed if a required flag is missing or user asks for help (-h)
	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "\nUsage: %s [-d <leak delay in ms; deafaults to 100> -l <leak limit in MiB>]\n", os.Args[0])
		flag.PrintDefaults()
		fmt.Println()
	}
	flag.Parse()

	//provide help (-h)
	if *hFlag == true {
		flag.Usage()
		os.Exit(0)
	}

	// a channel to use a hold when the memory limit it reached
	hold := make(chan bool)

	// a spinner that displays how much memory has leaked and when it holding
	go func(hold chan bool, lFlag int) {
		s := spinner.New(spinner.CharSets[35], 250*time.Millisecond)
		for {
			mem := memUsage()
			s.Prefix = fmt.Sprintf("Leaked: %d MiB ", mem)
			s.Start()
			s.Color("magenta")
			time.Sleep(1 * time.Second)
			s.Restart()
			// if we've reached the limit, update display and hold
			if mem >= uint64(lFlag) {
				s.Color("green")
				s.Prefix = fmt.Sprintf("Holding at %d MiB ", mem)
				s.UpdateCharSet(spinner.CharSets[28])
				s.UpdateSpeed(1 * time.Second)
				s.Restart()
				<-hold
			}
		}
	}(hold, *lFlag)

	// Although the "leak" var should contiue to grow, the GC is somehow getting in the way, disabling
	debug.SetGCPercent(-1)
	var leak string
	KB := `abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
			abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ`

	// start leaking indefinitely unless a limit has been provided and met
	for {
		leak += KB
		time.Sleep(time.Duration(*dFlag) * time.Millisecond)
		mem := memUsage()
		// if we've reached the limit, hold
		if mem >= uint64(*lFlag) {
			<-hold
		}
	}
}

func memUsage() uint64 {
	var m runtime.MemStats
	runtime.ReadMemStats(&m)
	return bToMb(m.Alloc)
}

func bToMb(b uint64) uint64 {
	return b / 1024 / 1024
}