CEL Benchmark in Go

bench_cel.go

package main

import (
	"log"
	"time"

	"github.com/google/cel-go/cel"
	"github.com/google/cel-go/checker/decls"
)

func bench_native() {
	var r float64
	failure := 2000.0
	count := 10000.0
	start := time.Now()
	for i := 0; i < 10_000; i++ {
		r = failure / count
	}
	_ = r
	end := time.Now()
	log.Printf("Duration native: %s", end.Sub(start))
}

func bench_cel() {
	env, err := cel.NewEnv(
		cel.Declarations(
			decls.NewVar("failure", decls.Double),
			decls.NewVar("count", decls.Double)))
	if err != nil {
		log.Fatalf("%v", err)
	}
	ast, issues := env.Compile("failure/count")
	if issues != nil && issues.Err() != nil {
		log.Fatalf("type-check error: %s", issues.Err())
	}
	prg, err := env.Program(ast)
	if err != nil {
		log.Fatalf("program construction error: %s", err)
	}
	params := make(map[string]interface{})
	start := time.Now()
	for i := 0; i < 10_000; i++ {
		params["failure"] = 200.0
		params["count"] = 1000.0
		_, details, err := prg.Eval(params)
		if err != nil {
			log.Fatalf("Err: %v, Details; %v", err, details)
		}
	}
	end := time.Now()
	log.Printf("Duration CEL: %s", end.Sub(start))
}

func main() {
	bench_native()
	bench_cel()
}

Output:

2021/10/01 00:45:06 Duration native: 32.505µs
2021/10/01 00:45:06 Duration CEL: 21.494471ms