How to load test Go language applications

How to use wrk to load test Go applications: Install Go and wrk tools. Create a Go HTTP API as an example. Use wrk for load testing: wrk -t 100 -c 1000 -d 30s http://localhost:8080/health Interpretation results: average latency, requests per second, 99% latency.

How to Load Test in Go Applications

Introduction

Load Testing is critical to evaluate an application's performance when handling large numbers of concurrent requests. In this article, we’ll take an in-depth look at how to perform load testing in Go applications and illustrate it using a practical case.

Tools

We need the following tools for load testing:

• go: Go language (already installed )
• wrk: HTTP load testing tool

Practical case: Benchmark HTTP API

Let’s start with A simple Go HTTP API as an example. It provides a "/health" endpoint that returns a JSON response about the status of the application.

1. Create HTTP API

package main

import (
    "fmt"
    "net/http"
)

// healthEndpoint 处理 "/health" 请求。
func healthEndpoint(w http.ResponseWriter, r *http.Request) {
    // 返回应用程序状态。
    fmt.Fprintf(w, `{ "status": "healthy" }`)
}

func main() {
    // 注册 "/health" 处理程序。
    http.HandleFunc("/health", healthEndpoint)

    // 监听并服务 HTTP 请求。
    http.ListenAndServe(":8080", nil)
}

2. Use wrk for load testing

wrk -t 100 -c 1000 -d 30s http://localhost:8080/health

This command will create 100 Concurrent threads and execute 1000 requests in 30 seconds.

3. Interpret the results

The output looks like:

Running 30s test @ http://localhost:8080/health
  100 threads and 1000 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency    39.25ms   15.28ms   148ms    67.72%
    Req/Sec    32.82k   21.70k   80.00k    70.18%
  Latency Distribution
     50%   34.11ms
     75%   42.99ms
     90%   54.76ms
     99%   100.87ms
  Req/Sec Distribution
     50%   28.02k
     75%   32.41k
     90%   59.89k
     99%   75.01k
Total: 984141 requests in 30.01s, 116.53MB read
Requests/sec:   32795.55
Transfer/sec:      4.01MB

This output shows:

• ##Avg. Latency: 39.25 ms
• Requests per second (QPS): 32.82k
• 99% Latency: 100.87 ms

Conclusion

This tutorial showed how to use wrk to perform load testing in a Go application. Load testing is important to evaluate the performance of your application and identify potential bottlenecks.

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