with_vfork.go

package main

import (
	"fmt"
	"os/exec"
	"syscall"
	"time"
)

func main() {
	var s []*[1024 * 1024]byte
	for i := 0; ; i++ {
		start := time.Now()
		for j := 0; j < 100; j++ {
			cmd := exec.Command("echo")
			cmd.SysProcAttr = &syscall.SysProcAttr{}
			cmd.SysProcAttr.Cloneflags = syscall.CLONE_VFORK
			cmd.Run()
		}

		fmt.Printf("%dGB: %s\n", i, time.Now().Sub(start)/time.Duration(100))

		if i == 3 {
			break
		}

		for j := 0; j < 1024; j++ {
			s = append(s, new([1024 * 1024]byte))
			cmd := exec.Command("echo")
			cmd.SysProcAttr = &syscall.SysProcAttr{}
			cmd.SysProcAttr.Cloneflags = syscall.CLONE_VFORK
			cmd.Run()
		}
	}
}

without_vfork.go

package main

import (
	"fmt"
	"os/exec"
	"time"
)

func main() {
	var s []*[1024 * 1024]byte
	for i := 0; ; i++ {
		start := time.Now()
		for j := 0; j < 100; j++ {
			exec.Command("echo").Run()
		}

		fmt.Printf("%dGB: %s\n", i, time.Now().Sub(start)/time.Duration(100))

		if i == 3 {
			break
		}

		for j := 0; j < 1024; j++ {
			s = append(s, new([1024 * 1024]byte))
			exec.Command("echo").Run()
		}
	}
}