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@ehfeng
Created June 27, 2023 18:22
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Performance cost of slightly complicated function call
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),
"another-key": fmt.Sprintf("another-value-%d", i),
})
}
b, err := json.Marshal(result)
if err != nil {
panic(err)
}
return string(b)
}
// must be a list of >5 length
func startIsolatesInParallel(n int, json string) {
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)
fnV, err := ctx.RunScript(`json => {const i = 124 - 121; return "hello" + json[i].key + json[4]["another-key"]}`, "")
if err != nil {
panic(err)
}
fn, err := fnV.AsFunction()
if err != nil {
panic(err)
}
v, err := v8.JSONParse(ctx, json)
if err != nil {
panic(err)
}
defer v.Release()
fnStart := time.Now()
_, err = fn.Call(v8.Undefined(isolate), v)
if err != nil {
panic(err)
}
fmt.Println("fn call", time.Since(fnStart))
wg.Done()
}()
}
wg.Wait()
}
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(10))
startIsolatesInParallel(1, generateJSON(10))
startIsolatesInParallel(1, generateJSON(100))
startIsolatesInParallel(1, generateJSON(1000))
startIsolatesInParallel(1, generateJSON(10000))
}
// Warmup: 6.587459ms
// fn call 114.584µs
// fn call 20.541µs
// fn call 20.625µs
// fn call 18.167µs
// fn call 24.625µs
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