highram.go

package main

import (
	"fmt"
	"log"
	"os"
	"runtime"
	"runtime/pprof"
	"strings"

	"github.com/prologic/bitcask"
)

func main() {
	s, err := bitcask.Open("hello.db")
	if err != nil {
		log.Fatalf("error while opening the database: %v", err)
	}

	totalVolumeSize := 800 << 20
	valueSize := 4 << 10

	value := []byte(strings.Repeat(" ", valueSize))
	for i := 1; i <= totalVolumeSize/valueSize; i++ {
		key := fmt.Sprintf("%32v", i)
		s.Put([]byte(key), value)
	}

	f, err := os.Create("heap.out")
	if err != nil {
		log.Fatal("memory profile file: ", err)
	}
	defer f.Close()
	runtime.GC()
	pprof.WriteHeapProfile(f)

	s.Close()
	os.RemoveAll("hello.db")
}