armap

HashMap on Arena

features:

• Generics support
• Map and Set, LinkedList types
• Minimal GC overhead map implements
• comparable key hash function uses maphash

Installation

go get github.com/octu0/armap

Example

package main

import (
	"fmt"

	"github.com/octu0/armap"
)

func main() {
	a := armap.NewArena(1024*1024, 4) // 1MB buffer size * 4
	defer a.Release() // release memory

	m := armap.NewMap[string, string](a, armap.WithCapacity(1000))

	m.Set("hello", "world1")
	v, ok := m.Get("hello")
	fmt.Println(v, ok) // => world1 true

	m.Set("hello", "world2")
	v, ok = m.Get("hello")
	fmt.Println(v, ok) // => world2 true

	m.Clear() // reset map, reuse memory

	v, ok = m.Get("hello")
	fmt.Println(v, ok) // => "" false
}

GC Benchmark

average GC time improved by ~200x.

$ go test -run=BenchmarkGC -bench=BenchmarkGC -benchtime=3x -v .
goos: darwin
goarch: amd64
pkg: github.com/octu0/armap
cpu: Intel(R) Core(TM) i7-8569U CPU @ 2.80GHz
BenchmarkGCSet
BenchmarkGCSet/golangmap
    armap_benchmark_test.go:92: min/avg/max/median = 59.526209ms/83.101306ms/270.682439ms/60.953085ms
    armap_benchmark_test.go:92: min/avg/max/median = 59.485567ms/67.009433ms/125.832941ms/59.875661ms
BenchmarkGCSet/golangmap-8         	       3	 223366544 ns/op
BenchmarkGCSet/armap
    armap_benchmark_test.go:117: min/avg/max/median = 216.152µs/377.403µs/507.442µs/377.907µs
    armap_benchmark_test.go:117: min/avg/max/median = 291.639µs/354.231µs/576.287µs/314.844µs
BenchmarkGCSet/armap-8             	       3	1353591775 ns/op
PASS

License

MIT, see LICENSE file for details.