-- Simple tiscaf benchmarking --

1. Both server and ApacheBench are running on the same workstation (Intel i5 760 at 3.2GHz).
   Operating system is Arch Linux with default TCP/IP stack settings (except for setting
   'net.ipv4.tcp_syncookies=0' in /etc/sysctl.conf and approriate limits for opened files
   number).

2. Complete server code:

import zgs.httpd._

object ServerOk extends HServer {

  def main(args: Array[String]): Unit = {
    try { new HStop(8911) stop } catch { case _ => }
    Thread.sleep(600)
    start
  }

  protected def ports = Set(8910)
  protected lazy val apps = List(theApp)

  override protected def tcpNoDelay = true // true for benchmarking only!!  
  override protected def interruptTimeoutMillis = 100
  
  override protected def onError(e: Throwable): Unit = filterSomeErrors(e)

  private def filterSomeErrors(err: Throwable): Unit = err.getMessage match {
    case "Broken pipe"              =>
    case "Connection reset by peer" =>
    case _                          => err match {
      case _: java.nio.channels.ClosedSelectorException => 
      case e                                            => e.printStackTrace
    }
  }
  
  object theApp extends HApp {
    override def keepAlive = true
    override def chunked   = false
    override def buffered  = false
    override def gzip      = false
    override def tracking  = HTracking.NotAllowed
    
    def resolve(req: HReqHeaderData) = Some(Let)
  } 

  object Let extends HLet  {
    private val bytes = "Ok".getBytes("UTF-8")
    def act(tk: HTalk) {
      tk.setContentLength(bytes.size)
        .setContentType("text/plain; charset=UTF-8")
        .setContentLength(bytes.length) // if not buffered
        .write(bytes)
    }
  }

}

3. ApacheBench output

~ $ ab -c 20000 -n 1000000 -k 127.0.0.1:8910/ok
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 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 100000 requests
Completed 200000 requests
Completed 300000 requests
Completed 400000 requests
Completed 500000 requests
Completed 600000 requests
Completed 700000 requests
Completed 800000 requests
Completed 900000 requests
Completed 1000000 requests
Finished 1000000 requests


Server Software:        tiscaf
Server Hostname:        127.0.0.1
Server Port:            8910

Document Path:          /ok
Document Length:        2 bytes

Concurrency Level:      20000
Time taken for tests:   11.985 seconds
Complete requests:      1000000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    1000000
Total transferred:      216057888 bytes
HTML transferred:       2000536 bytes
Requests per second:    83436.06 [#/sec] (mean)
Time per request:       239.704 [ms] (mean)
Time per request:       0.012 [ms] (mean, across all concurrent requests)
Transfer rate:          17604.51 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    4 133.5      0    7030
Processing:    12   79  48.0     75    3105
Waiting:       12   79  48.0     75    3105
Total:         12   83 156.6     75   10088

Percentage of the requests served within a certain time (ms)
  50%     75
  66%     84
  75%     90
  80%     96
  90%    108
  95%    123
  98%    142
  99%    156
 100%  10088 (longest request)