[PHP] stream, socket 다운로드 벤치마킹 및 튜닝

- 작성자 : 김칠봉 < san2(at)linuxchannel.net >
- 작성일 : 2005.03.30 내용추가
          2005.03.28
- 내  용 : client stream(blocking), socket(blocking/non-blocking)
          download Benchmark with server KeepAlive
- 수  준 : 초중급 이상
- 키워드 : fsockopen(), feof(), fgets(), fread(), KeepAlive, Connection
          blocking, non-blocking, socket_read()

*주1)
이 문서에 대한 최신 내용은 아래 URL에서 확인할 수 있습니다.

http://linuxchannel.net/docs/php-stream-socket-benchmark.txt

*주2)
이 문서에서 사용한 `buf'는 공식적인 용어가 아니고, buffering 한 데이터나
또는 그것들을 지칭하는 PHP 사용자 변수를 말합니다.

*조건)
 - 서버(아파치) KeepAlive On/Off, 약 100 MBytes data
 - 클라이언트(PHP cli) blocking/non-blocking mode
 (PHP 로 비교적 덩치큰 파일을 다운로드 받을 경우에 해당됨)

* benchmark source)
http://ftp.linuxchannel.net/devel/php_download/


목차
------------------------------------------------------------------------------------
1. client blocking (fsockopen) benchmark
2. client blocking (socket) benchmark
3. client non-blocking (socket) benchmark
4. client non-blocking buf check (socket) benchmark
------------------------------------------------------------------------------------


1. client blocking (fsockopen) benchmark

------------------------------------------------------------------------------------
clinet                        server KeepAlive On  server KeepAlive Off  HTTP header
------------------------------------------------------------------------------------
NA(feof)                            3965.9 KB/sec*        10718.7KB/sec
Connection                        10882.1 KB/sec        10904.4KB/sec        close
timeout                            4017.3 KB/sec*        10769.2KB/sec
buf check                          3984.5 KB/sec*        10811.5KB/sec 　
Connection + timeout              11094.3 KB/sec        11382.6KB/sec        close
Connection + buf check            10700.1 KB/sec        11489.4KB/sec        close
timeout + buf check                10059.0 KB/sec        11073.0KB/sec
Connection + timeout + buf check  10589.5 KB/sec        11497.5KB/sec        close
------------------------------------------------------------------------------------

PHP guide
(
  Connection: close [+ ...] // <-- recommend
  or
  timeout + buf check [+ ...]
)

example
(
  $req = "GET /path HTTP/1.1\\r\\nHost: hostname\\r\\nConnection: close\\r\\n\\r\\n";
  $fp = fscokopen(...);
  stream_set_timeout($fp,0,500000); // some recommend
  fwrite($fp,$req);
  while($buf = fread($fp,4096))
  {
      $rbuf .= $buf;
      ...
  }
  fclose($fp);
)


2. client blocking (socket) benchmark

------------------------------------------------------------------------------------
clinet                        server KeepAlive On  server KeepAlive Off  HTTP header
------------------------------------------------------------------------------------
NA(socket_read)                      4014.9KB/sec*        11463.8KB/sec
Connection                          11491.0KB/sec        11465.4KB/sec        close
timeout                            11372.2KB/sec        11482.3KB/sec
buf(1M)                              4007.5KB/sec*        11294.7KB/sec
Connection + timeout                11373.5KB/sec        11496.8KB/sec        close
Connection + buf(1M)                11500.8KB/sec        11017.5KB/sec        close
timeout + buf(1M)                  11373.2KB/sec        11499.9KB/sec
Connection + timeout + buf(1M)      11369.1KB/sec        11378.3KB/sec        close
------------------------------------------------------------------------------------

PHP guide
(

  Connection: close [+ ...]
  or
  timeout [+ ...]
)

example
(
  $req = "GET /path HTTP/1.1\\r\\nHost: hostname\\r\\nConnection: close\\r\\n\\r\\n";
  $timeout = array('sec'=>0,'usec'=>500000);
  $sock = socket_create(...);
  socket_set_option($sock,...,SO_RCVTIMEO,$timeout); // some recommend
  socket_connect(...);
  socket_write($sock,$req);
  while($buf = socket_read($sock,1048576))
  {
      $rbuf .= $buf;
      ...
  }
  socket_close($sock);
)


3. client non-blocking (socket) benchmark

------------------------------------------------------------------------------------
clinet                        server KeepAlive On  server KeepAlive Off  HTTP header
------------------------------------------------------------------------------------
NA(socket_read)                    11352.4KB/sec            CLOSE_WAIT*
Connection                            CLOSE_WAIT*          CLOSE_WAIT*      close
timeout                            11343.1KB/sec            CLOSE_WAIT*
buf(1M)                            11361.0KB/sec            CLOSE_WAIT*
Connection + timeout                  CLOSE_WAIT*          CLOSE_WAIT*      close
Connection + buf(1M)                  CLOSE_WAIT*          CLOSE_WAIT*      close
timeout + buf(1M)                  11359.1KB/sec            CLOSE_WAIT*
Connection + timeout + buf(1M)        CLOSE_WAIT*          CLOSE_WAIT*      close
------------------------------------------------------------------------------------

PHP guide
(
  buf check [+ ...]
)

example
(
  $req = "GET /path HTTP/1.1\\r\\nHost: hostname\\r\\nConnection: close\\r\\n\\r\\n";
  $timeout = array('sec'=>0,'usec'=>500000);
  $sock = socket_create(...);
  socket_set_option($sock,...,SO_RCVTIMEO,$timeout); // some recommend
  socket_connect(...);
  socket_write($sock,$req);
  socket_set_nonblock($sock); // set to non-blocking mode
  $stream = array($sock);
  while(@socket_select($stream,$write=NULL,$except=NULL,0,500000) !== FALSE)
  {
      if(!in_array($sock,$stream)) break;
      if($buf = @socket_read($sock,1048576))
      {
            $rbuf .= $buf;
            ...
      } else break; // good idea, EOF, buf check
  }
  socket_close($sock);
)


4. client non-blocking buf check (socket) benchmark

------------------------------------------------------------------------------------
clinet                        server KeepAlive On  server KeepAlive Off  HTTP header
------------------------------------------------------------------------------------
NA(socket_read)                    10870.7KB/sec        11455.9KB/sec
Connection                          11488.1KB/sec        11481.9KB/sec        close
timeout                            10869.7KB/sec        11165.4KB/sec
buf(1M)                            10872.9KB/sec        11494.5KB/sec
Connection + timeout                10903.7KB/sec        11496.6KB/sec        close
Connection + buf(1M)                11500.6KB/sec        11500.2KB/sec        close
timeout + buf(1M)                  10880.3KB/sec        11399.8KB/sec
Connection + timeout + buf(1M)      11500.1KB/sec        11498.4KB/sec        close
------------------------------------------------------------------------------------

PHP guide
(
  buf check [+ ...]
)


example
(
  same as above example
)


EOF