72 lines
1.0 KiB
Go
72 lines
1.0 KiB
Go
|
// For more tutorials: https://blog.learngoprogramming.com
|
||
|
|
//
|
||
|
|
// Copyright © 2018 Inanc Gumus
|
||
|
|
// Learn Go Programming Course
|
||
|
|
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
|
||
|
|
//
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
// Before running this program:
|
||
|
|
//
|
||
|
|
// RUN: `go run nums/main.go`
|
||
|
|
// It will create a 12 MB long nums.txt file.
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"io/ioutil"
|
||
|
|
"runtime"
|
||
|
|
|
||
|
|
s "github.com/inancgumus/prettyslice"
|
||
|
|
)
|
||
|
|
|
||
|
|
const (
|
||
|
|
loops = 1000
|
||
|
|
file = "nums.txt"
|
||
|
|
)
|
||
|
|
|
||
|
|
var buf []byte
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
{
|
||
|
|
b, _ := ioutil.ReadFile(file)
|
||
|
|
buf = b[:1]
|
||
|
|
|
||
|
|
s.Show("sliced buf", buf)
|
||
|
|
}
|
||
|
|
report()
|
||
|
|
|
||
|
|
{
|
||
|
|
var nilBuf []byte
|
||
|
|
|
||
|
|
b, _ := ioutil.ReadFile(file)
|
||
|
|
buf = append(nilBuf, b[:1]...)
|
||
|
|
|
||
|
|
s.Show("copied buf", buf)
|
||
|
|
}
|
||
|
|
report()
|
||
|
|
}
|
||
|
|
|
||
|
|
func report() {
|
||
|
|
const KB = 1024
|
||
|
|
|
||
|
|
var m runtime.MemStats
|
||
|
|
r := func() {
|
||
|
|
runtime.ReadMemStats(&m)
|
||
|
|
fmt.Printf("%v KB\n", m.Alloc/KB)
|
||
|
|
}
|
||
|
|
|
||
|
|
fmt.Print(" > Before Garbage Collection: ")
|
||
|
|
r()
|
||
|
|
|
||
|
|
runtime.GC()
|
||
|
|
fmt.Print(" > After Garbage Colletion : ")
|
||
|
|
r()
|
||
|
|
}
|
||
|
|
|
||
|
|
func init() {
|
||
|
|
s.Width = 50
|
||
|
|
s.PrintBacking = true
|
||
|
|
s.MaxElements = 10
|
||
|
|
}
|