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tinybench.go
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tinybench.go
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package main
import (
"bufio"
"bytes"
"errors"
"fmt"
"log"
"os"
"os/exec"
"path/filepath"
"sort"
"strings"
"time"
)
const (
BENCHMARK_DURATION = 10
ERROR_PREFIX = " Error: "
START_DELIMITER = "// tinybench start"
STOP_DELIMITER = "// tinybench stop"
)
type BenchmarkResult struct {
Min, Max, Median time.Duration
Iterations int
}
func main() {
if err := run(); err != nil {
log.Fatal(err)
}
}
func run() error {
log.SetFlags(0)
fmt.Print("\033[H\033[2J")
fmt.Println("\n Welcome to tinybench, a tiny Go tool for benchmarking JavaScript code")
code, err := readJSFile()
if err != nil {
return err
}
standardCode, benchmarkCode, err := parse(code)
if err != nil {
return err
}
results, err := executeBenchmarks(benchmarkCode, standardCode)
if err != nil {
return err
}
displayResults(results)
return nil
}
func readJSFile() ([]byte, error) {
if len(os.Args) < 2 {
return nil, errors.New(ERROR_PREFIX + "Please provide a path to a valid JS file.")
}
absPath, err := filepath.Abs(os.Args[1])
if err != nil {
return nil, errors.New(ERROR_PREFIX + err.Error())
}
file, err := os.ReadFile(absPath)
if err != nil {
return nil, errors.New(ERROR_PREFIX + err.Error())
}
return file, nil
}
func parse(code []byte) (string, []string, error) {
scanner := bufio.NewScanner(bytes.NewReader(code))
var standardCode, currBenchmark strings.Builder
var benchmarkSegments []string
inBenchmark := false
for scanner.Scan() {
line := scanner.Text()
switch strings.TrimSpace(line) {
case START_DELIMITER:
inBenchmark = true
currBenchmark.Reset()
case STOP_DELIMITER:
inBenchmark = false
benchmarkSegments = append(benchmarkSegments, currBenchmark.String())
default:
if inBenchmark {
currBenchmark.WriteString(line + "\n")
} else {
standardCode.WriteString(line + "\n")
}
}
}
if err := scanner.Err(); err != nil {
return "", nil, err
}
if len(benchmarkSegments) == 0 {
return "", nil, errors.New(ERROR_PREFIX + `No benchmarks found. Please define at least one benchmark:
// tinybench start
{{ CODE TO BENCHMARK }}
// tinybench stop`)
}
return standardCode.String(), benchmarkSegments, nil
}
func executeBenchmarks(codeSegments []string, code string) ([]BenchmarkResult, error) {
results := make([]BenchmarkResult, len(codeSegments))
nodePath, err := exec.LookPath("node")
if err != nil {
return nil, errors.New(ERROR_PREFIX + "Node.js not found. Please install Node.js and try again.")
}
for i, segment := range codeSegments {
fmt.Printf("\n Found benchmark %d:\n\n\t```\n\t%s\n\t```\n\n Executing benchmark %d", i+1, strings.ReplaceAll(segment, "\n", "\n\t"), i+1)
iterations := 0
executionTimes := make([]time.Duration, 0)
stopCh := make(chan struct{})
go func() {
for {
select {
case <-stopCh:
return
default:
cmd := exec.Command(nodePath, "-e", code+segment)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
startTime := time.Now()
if err := cmd.Run(); err != nil {
log.Fatal(ERROR_PREFIX, err)
}
executionTime := time.Since(startTime)
executionTimes = append(executionTimes, executionTime)
iterations++
}
}
}()
for i := 0; i < BENCHMARK_DURATION; i++ {
fmt.Print(".")
time.Sleep(1 * time.Second)
}
stopCh <- struct{}{}
fmt.Println(" done!")
sort.Slice(executionTimes, func(i, j int) bool {
return executionTimes[i] < executionTimes[j]
})
minTime := executionTimes[0]
maxTime := executionTimes[len(executionTimes)-1]
medianTime := executionTimes[len(executionTimes)/2]
results[i] = BenchmarkResult{Min: minTime, Max: maxTime, Median: medianTime, Iterations: iterations}
}
return results, nil
}
func displayResults(results []BenchmarkResult) {
fmt.Println("\n Results")
fastestBenchmark := 0
fastestMedian := results[0].Median
for i, result := range results {
if result.Median < fastestMedian {
fastestBenchmark = i
fastestMedian = result.Median
}
}
headerFormat := " | %-10s | %-10s | %-10s | %-10s | %-10s | %-12s |\n"
rowFormat := " | %-10d | %-10d | %-10d | %-10d | %-10d | %-12s |\n"
fmt.Printf(headerFormat, "Benchmark", "Iterations", "Min(ms)", "Max(ms)", "Median(ms)", "Delta")
fmt.Println(" " + strings.Repeat("-", 81))
for i, result := range results {
differenceLabel := "Fastest"
if i != fastestBenchmark {
percentageDifference := float64(result.Median-fastestMedian) / float64(fastestMedian) * 100
differenceLabel = fmt.Sprintf("%.0f%% Slower", percentageDifference)
}
fmt.Printf(rowFormat, i+1, result.Iterations,
result.Min.Milliseconds(),
result.Max.Milliseconds(),
result.Median.Milliseconds(),
differenceLabel)
}
}