Parallelism, JSON parsing, and v8

v8_json_parse_perf.go

package main

import (
	"encoding/json"
	"fmt"
	"runtime"
	"sync"
	"time"

	v8 "rogchap.com/v8go"
)

func generateJSON(size int) string {
	result := []map[string]string{}
	for i := 0; i < size; i++ {
		result = append(result, map[string]string{
			"key": fmt.Sprintf("value-%d", i),
		})
	}
	b, err := json.Marshal(result)
	if err != nil {
		panic(err)
	}
	return string(b)
}

func startIsolatesInParallel(n int, json string) {
	start := time.Now()
	var wg sync.WaitGroup
	for i := 0; i < n; i++ {
		wg.Add(1)
		go func() {
			runtime.LockOSThread()
			defer runtime.UnlockOSThread()
			isolate := v8.NewIsolate()
			defer isolate.Dispose()
			ctx := v8.NewContext(isolate)
			_, err := v8.JSONParse(ctx, json)
			if err != nil {
				panic(err)
			}
			wg.Done()
		}()
	}

	wg.Wait()
	var size string
	if len(json) > 1000 {
		size = fmt.Sprintf("%dKB", len(json)/1000)
	} else if len(json) > 1_000_000 {
		size = fmt.Sprintf("%dMB", len(json)/1000000)
	}
	fmt.Println("json size", size, n, ":", time.Since(start))
}

func main() {
	var start time.Time
	start = time.Now()
	isolate := v8.NewIsolate()
	v8.NewContext(isolate)
	isolate.Dispose()
	fmt.Println("Warmup:", time.Since(start))
	startIsolatesInParallel(1, generateJSON(100))
	startIsolatesInParallel(2, generateJSON(100))
	startIsolatesInParallel(4, generateJSON(100))
	startIsolatesInParallel(6, generateJSON(100))
	startIsolatesInParallel(1, generateJSON(1000))
	startIsolatesInParallel(2, generateJSON(1000))
	startIsolatesInParallel(4, generateJSON(1000))
	startIsolatesInParallel(6, generateJSON(1000))
	startIsolatesInParallel(1, generateJSON(10000))
	startIsolatesInParallel(2, generateJSON(10000))
	startIsolatesInParallel(4, generateJSON(10000))
	startIsolatesInParallel(6, generateJSON(10000))
}

// run on a 8-core machine

// Warmup: 6.625875ms
// json size 1KB 1 : 1.324083ms
// json size 1KB 2 : 1.303583ms
// json size 1KB 4 : 1.668041ms
// json size 1KB 6 : 2.613834ms
// json size 19KB 1 : 1.2825ms
// json size 19KB 2 : 1.416292ms
// json size 19KB 4 : 1.868833ms
// json size 19KB 6 : 2.824125ms
// json size 208KB 1 : 3.199583ms
// json size 208KB 2 : 3.1735ms
// json size 208KB 4 : 4.83775ms
// json size 208KB 6 : 6.479958ms