2016q1 Homework #3

預期目標

• 學習多執行緒程式開發
• 應用物件導向程式開發方法
• 透過 Doxygen 自動建立技術文件
• 培養專業程式開發風格

預先安裝的套件

$ sudo apt-get install apache2-utils check
$ sudo apt-get install doxygen graphviz

Server Framework in modern C

• server-framework: 用 C99 撰寫、具備物件導向程式設計風格的伺服器開發框架
• 由三部份組成:
  • async
  • reactor
  • protocol-server
• 取得原始碼並編譯:

$ git clone https://github.com/embedded2016/server-framework.git
$ cd server-framework
$ make

• 測試 async

$ ./test-async

- 預期將看到類似以下輸出:

wrote task 8190
wrote task 8191
Hi! 16377
Hi! 16378
# signal finish at (711.426132) ms
# elapsed time: (711.728594) ms

• 測試 reactor

$ ./test-reactor

- 預期將看到以下訊息:

Serving HTTP on 127.0.0.1 port 8080
now open up the URL http://localhost:8080 on your browser

- 依據指示，在網頁瀏覽器裡頭打開網址 `http://localhost:8080`，將會看到 "Hello World!" 字樣
- 回到原本執行 `./test-reactor` 的終端機視窗，按下 `Ctrl-C` 以結束程式

• 測試 protocol-server

$ ./test-protocol-server

- 預期將看到類似以下訊息:

(pid 4130 : 8 threads) Listening on port 8080 (max sockets: 65536, ~5 used)

- 這時再次透過網頁瀏覽器開啟網址 `http://localhost:8080`，可以發現原本終端機印出類似以下訊息:

A connection was accepted on socket #7.
A connection was accepted on socket #8.
Socket #7 is now disconnected.
Socket #8 is now disconnected.

- 重複上述動作幾次，又會看到新的訊息，指出 socket 編號的更動

測試網頁伺服器的效能

• 確保之前的測試程式均已關閉，而且 port 8080 沒被佔用
  • 可透過 $ pkill -9 httpd 來強制關閉伺服器
• 執行 $ ./httpd，預期將看到類似以下輸出:

(pid 4223 : 1 threads) Listening on port 8080 (max sockets: 65536, ~5 used)
Clients: 0
# Total Clients: 0

• 不要關閉執行 httpd 的終端機視窗，為了後續說明方面，我們稱為這個終端機畫面為「伺服器」
• 開啟新的終端機視窗，並執行以下指令:

$ ab -c 32 -n 100 http://localhost:8080/

- 預期將看到以下輸出，請抱持耐心，等待且不要執行其他程式

This is ApacheBench, Version 2.3 <$Revision: 1706008 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

- 等待一陣子之後，會看到類似以下輸出:

Concurrency Level:      32
Time taken for tests:   15.621 seconds
Complete requests:      100
Failed requests:        6
   (Connect: 0, Receive: 0, Length: 6, Exceptions: 0)
Total transferred:      9900 bytes
HTML transferred:       1300 bytes
Requests per second:    6.40 [#/sec] (mean)
Time per request:       4998.873 [ms] (mean)
Time per request:       156.215 [ms] (mean, across all concurrent requests)
Transfer rate:          0.62 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    2   0.7      2       3
Processing:  3619 3877 177.2   3996    4001
Waiting:        0    1   0.5      0       3
Total:       3621 3879 177.2   3998    4001