2019年，Golang开始吊打Java性能了！！！

最近要同事debug性能，不经意间发现现在Golang性能开始吊打Java了！！！感觉Go发展神速！！ 之前Go和Java基本是平手，甚至还有较大差距，请见https://www.cnblogs.com/sunsky303/p/6506663.html。借此机会对比了下，Java/Go http server最近的性能，毕竟这是后端同学最关心的问题之一！！

java 10 vs Golang1.12， Google上最快的2个http server性能PK, 压测10次，取平均值。

Java

import org.rapidoid.buffer.Buf;
import org.rapidoid.http.AbstractHttpServer;
import org.rapidoid.http.HttpStatus;
import org.rapidoid.http.MediaType;
import org.rapidoid.net.abstracts.Channel;
import org.rapidoid.net.impl.RapidoidHelper;

public class RapidoidHttpFast extends AbstractHttpServer
{
 private static final int port = ;
 private static final byte HOME[] = "/".getBytes();
 private static final byte HELLO_WORLD[] = "Hello World".getBytes();

 @Override
 protected HttpStatus handle(Channel ctx, Buf buf, RapidoidHelper req)
 {
  if (req.isGet.value && matches(buf, req.path, HOME))
  {
   return ok(ctx, req.isKeepAlive.value, HELLO_WORLD, MediaType.TEXT_PLAIN);
  }

  return HttpStatus.NOT_FOUND;
 }

 public static void main(String[] args) throws Exception
 {
  new RapidoidHttpFast().listen(port);
 }
}

sysctl -n machdep.cpu.brand_string ;java --version ;java -cp ".:/Users/wuqj/Downloads/jar_files/*" HelloWorldExample
Intel(R) Core(TM) i5-4278U CPU @ 2.60GHz
java 10 2018-03-20
Java(TM) SE Runtime Environment 18.3 (build 10+46)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10+46, mixed mode)
19:50:33.353 [main] INFO o.r.config.RapidoidInitializer - Starting Rapidoid v5.5.5, built on 2018-05-27 15:45 UTC
19:50:33.358 [main] INFO o.r.config.RapidoidInitializer - System info | os = Mac OS X | java = 10 | process = 17435@sun-pro.local | max memory = 2048 MB | dir = /labs/java
19:50:33.639 [main] INFO org.rapidoid.env.Environment - No profiles were specified, activating 'default' profile
19:50:33.645 [main] INFO org.rapidoid.env.Environment - No production/dev/test mode was configured, inferring mode | mode = DEV
19:50:33.645 [main] INFO org.rapidoid.env.Environment - Initialized environment | mode = DEV | profiles = [default, dev]
19:50:33.932 [main] INFO org.rapidoid.config.ConfigImpl - Loaded configuration | namespace = config | files = [built-in-config.yml, built-in-config-default.yml, built-in-config-dev.yml]
19:50:34.065 [main] INFO o.rapidoid.http.impl.HttpRoutesImpl - GET / | setup = main | roles = [] | transaction = NONE | mvc = false | cacheTTL = 0
19:50:34.072 [main] INFO org.rapidoid.setup.App - Inferred application root | main = HelloWorldExample | package =
19:50:34.080 [main] INFO org.rapidoid.setup.WatchForChanges - Watching classpath for changes... | classpath = [/labs/java/.]
19:50:34.175 [server] INFO o.r.net.impl.RapidoidServerLoop - Starting server | address = 0.0.0.0 | port = 8080 | I/O workers = 4 | sync = true | accept = non-blocking
19:50:34.399 [main] INFO org.rapidoid.setup.Setup - Server has started | setup = main | home = http://localhost:8080
19:50:34.400 [main] INFO org.rapidoid.setup.Setup - Static resources will be served from the following locations | setup = main | locations = [static, default/static]

ab -c100 -n100000 -k 'http://127.0.0.1:8080/'
This is ApacheBench, Version 2.3 <$Revision:  $>
Copyright  Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Finished  requests

Server Software:        Rapidoid
Server Hostname:        127.0.0.1
Server Port:            

Document Path:          /
Document Length:         bytes

Concurrency Level:
Time taken for tests:   2.872 seconds
Complete requests:
Failed requests:
Keep-Alive requests:
Total transferred:       bytes
HTML transferred:        bytes
Requests per second:    34822.08 [#/sec] (mean)
Time per request:       2.872 [ms] (mean)
Time per request:       0.029 [ms] (mean, across all concurrent requests)
Transfer rate:          5781.01 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:               0.2
Processing:            1.6
Waiting:               1.6
Total:                 1.6            

Percentage of the requests served within a certain time (ms)
  %
  %
  %
  %
  %
  %
  %
  %
 %      (longest request)

Golang

package main

import (
    "flag"
    "fmt"
    "github.com/valyala/fasthttp"
    "log"
)

var (
    addr     = flag.String("addr", ":8080", "TCP address to listen to")
    compress = flag.Bool("compress", false, "Whether to enable transparent response compression")
)

func main() {
    flag.Parse()
    h := requestHandler

    if err := fasthttp.ListenAndServe(*addr, h); err != nil {
        log.Fatalf("Error in ListenAndServe: %s", err)
    }
}

func requestHandler(ctx *fasthttp.RequestCtx) {
    fmt.Fprintf(ctx, "Hello world")
}

 sysctl -n machdep.cpu.brand_string ;go version ; go run ../fasthttp/helloworldserver.go
Intel(R) Core(TM) i5-4278U CPU @ .60GHz
go version go1.12.4 darwin/amd64

ab -c100 -n100000 -k 'http://127.0.0.1:8080/'
This is ApacheBench, Version 2.3 <$Revision:  $>
Copyright  Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 127.0.0.1 (be patient)
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Finished  requests

Server Software:        fasthttp
Server Hostname:        127.0.0.1
Server Port:            

Document Path:          /
Document Length:         bytes

Concurrency Level:
Time taken for tests:   2.282 seconds
Complete requests:
Failed requests:
Keep-Alive requests:
Total transferred:       bytes
HTML transferred:        bytes
Requests per second:    43819.46 [#/sec] (mean)
Time per request:       2.282 [ms] (mean)
Time per request:       0.023 [ms] (mean, across all concurrent requests)
Transfer rate:          7274.72 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:               0.1
Processing:            1.8
Waiting:               1.8
Total:                 1.8           

Percentage of the requests served within a certain time (ms)
  %
  %
  %
  %
  %
  %
  %
  %
 %     (longest request)

QPS上 Go 43819.46吊打 Java 34822.08！！！

看来走Golang路线没错。 后续我有空会分析下原理。