How to Reduce Memory Allocations in Go

Performance

2026-04-17T12:05:42+00:00

Reduce Go memory allocations by reusing buffers with sync.Pool, avoiding string concatenation, and using the arena package for bulk memory management.

Reduce memory allocations in Go by reusing buffers, avoiding unnecessary string concatenations, and using the arena package for bulk allocations. Use bytes.Buffer or sync.Pool to recycle objects instead of creating new ones in tight loops.

import (
	"bytes"
	"sync"
)

var bufPool = sync.Pool{
	New: func() interface{} {
		return &bytes.Buffer{}
	},
}

func process() {
	buf := bufPool.Get().(*bytes.Buffer)
	defer bufPool.Put(buf)
	buf.Reset()
	// Use buf instead of creating new slices/strings
}