Linux 使用curl度量网站响应速度

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刚刚man了一下curl的-w的参数，吓一跳，内容真的好多啊！！！

[root@PC ~]# curl -o /dev/null -s -w '%{time_connect}\n' 'https://www.t4x.org'    #建立到服务器的 TCP 连接所用的时间
0.372
[root@PC ~]# curl -o /dev/null -s -w '%{time_starttransfer}\n' 'https://www.t4x.org'    #在发出请求之后,Web 服务器返回数据的第一个字节所用的时间         
1.413
[root@PC ~]# curl -o /dev/null -s -w '%{time_total}\n' 'https://www.t4x.org'    #完成请求所用的时间
1.001
[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}\n' 'https://www.t4x.org'    # 	DNS解析时间,从请求开始到DNS解析完毕所用时间(记得关掉 Linux 的 nscd 的服务测试)
0.289
[root@PC ~]# curl -o /dev/null -s -w '%{speed_download}\n' 'https://www.t4x.org'    #下载速度，单位-字节每秒。
16061.000

[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download}\n' 'https://www.t4x.org'
1.353:1.371:1.902:2.054:17378.000
[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download}\n' 'http://zmingcx.com' 
0.181:0.223:0.266:0.570:135401.000

[root@PC ~]# curl -o /dev/null -s -w '%{time_connect}\n' 'https://www.t4x.org' #建立到服务器的 TCP 连接所用的时间

0.372

[root@PC ~]# curl -o /dev/null -s -w '%{time_starttransfer}\n' 'https://www.t4x.org' #在发出请求之后,Web 服务器返回数据的第一个字节所用的时间

1.413

[root@PC ~]# curl -o /dev/null -s -w '%{time_total}\n' 'https://www.t4x.org' #完成请求所用的时间

1.001

[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}\n' 'https://www.t4x.org' # DNS解析时间,从请求开始到DNS解析完毕所用时间(记得关掉 Linux 的 nscd 的服务测试)

0.289

[root@PC ~]# curl -o /dev/null -s -w '%{speed_download}\n' 'https://www.t4x.org' #下载速度，单位-字节每秒。

16061.000

[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download}\n' 'https://www.t4x.org'

1.353:1.371:1.902:2.054:17378.000

[root@PC ~]# curl -o /dev/null -s -w '%{time_namelookup}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download}\n' 'http://zmingcx.com'

0.181:0.223:0.266:0.570:135401.000

          NOTE: The %-symbol is a special symbol in the win32-environment,
          where  all  occurrences  of  %  must  be doubled when using this
          option.

          The variables available at this point are:

          url_effective  The URL that was fetched last. This is most mean-
                 ingful  if  you’ve  told curl to follow location:
                 headers.

          http_code      The numerical response code that was found in the
                 last  retrieved  HTTP(S)  or  FTP(s) transfer. In
                 7.18.2 the alias response_code was added to  show
                 the same info.

          http_connect   The  numerical  code  that  was found in the last
                 response  (from  a  proxy)  to  a  curl   CONNECT
                 request. (Added in 7.12.4)

          time_total     The  total time, in seconds, that the full opera-
                 tion lasted. The time will be displayed with mil-
                 lisecond resolution.
          time_namelookup
                 The  time,  in  seconds,  it  took from the start
                 until the name resolving was completed.

          time_connect   The time, in seconds,  it  took  from  the  start
                 until  the  TCP  connect  to  the remote host (or
                 proxy) was completed.

          time_appconnect
                 The time, in seconds,  it  took  from  the  start
                 until  the  SSL/SSH/etc  connect/handshake to the
                 remote host was completed. (Added in 7.19.0)

          time_pretransfer
                 The time, in seconds,  it  took  from  the  start
                 until  the file transfer was just about to begin.
                 This includes all pre-transfer commands and nego-
                 tiations that are specific to the particular pro-
                 tocol(s) involved.
          time_redirect  The time, in seconds, it took for all redirection
                 steps  include  name lookup, connect, pretransfer
                 and transfer before  the  final  transaction  was
                 started.  time_redirect shows the complete execu-
                 tion time for multiple  redirections.  (Added  in
                 7.12.3)

          time_starttransfer
                 The  time,  in  seconds,  it  took from the start
                 until the first byte was just about to be  trans-
                 ferred.  This  includes time_pretransfer and also
                 the time  the  server  needed  to  calculate  the
                 result.

          size_download  The total amount of bytes that were downloaded.

          size_upload    The total amount of bytes that were uploaded.

          size_header    The total amount of bytes of the downloaded head-
                 ers.

          size_request   The total amount of bytes that were sent  in  the
                 HTTP request.
          speed_download The average download speed that curl measured for
                 the complete download.

          speed_upload   The average upload speed that curl  measured  for
                 the complete upload.

          content_type   The  Content-Type  of  the requested document, if
                 there was any.

          num_connects   Number of new connects made in the recent  trans-
                 fer. (Added in 7.12.3)

          num_redirects  Number  of  redirects  that  were followed in the
                 request. (Added in 7.12.3)

          redirect_url   When a HTTP request was made without -L to follow
                 redirects, this variable will show the actual URL
                 a redirect would take you to. (Added in 7.18.2)

          ftp_entry_path The initial path libcurl ended up in when logging
                 on to the remote FTP server. (Added in 7.15.4)

          ssl_verify_result
                 The  result of the SSL peer certificate verifica-
                 tion that was requested. 0 means the verification
                 was successful. (Added in 7.19.0)

NOTE: The %-symbol is a special symbol in the win32-environment,

where all occurrences of % must be doubled when using this

option.

The variables available at this point are:

url_effective The URL that was fetched last. This is most mean-

ingful if you’ve told curl to follow location:

headers.

http_code The numerical response code that was found in the

last retrieved HTTP(S) or FTP(s) transfer. In

7.18.2 the alias response_code was added to show

the same info.

http_connect The numerical code that was found in the last

response (from a proxy) to a curl CONNECT

request. (Added in 7.12.4)

time_total The total time, in seconds, that the full opera-

tion lasted. The time will be displayed with mil-

lisecond resolution.

time_namelookup

The time, in seconds, it took from the start

until the name resolving was completed.

time_connect The time, in seconds, it took from the start

until the TCP connect to the remote host (or

proxy) was completed.

time_appconnect

The time, in seconds, it took from the start

until the SSL/SSH/etc connect/handshake to the

remote host was completed. (Added in 7.19.0)

time_pretransfer

The time, in seconds, it took from the start

until the file transfer was just about to begin.

This includes all pre-transfer commands and nego-

tiations that are specific to the particular pro-

tocol(s) involved.

time_redirect The time, in seconds, it took for all redirection

steps include name lookup, connect, pretransfer

and transfer before the final transaction was

started. time_redirect shows the complete execu-

tion time for multiple redirections. (Added in

7.12.3)

time_starttransfer

The time, in seconds, it took from the start

until the first byte was just about to be trans-

ferred. This includes time_pretransfer and also

the time the server needed to calculate the

result.

size_download The total amount of bytes that were downloaded.

size_upload The total amount of bytes that were uploaded.

size_header The total amount of bytes of the downloaded head-

ers.

size_request The total amount of bytes that were sent in the

HTTP request.

speed_download The average download speed that curl measured for

the complete download.

speed_upload The average upload speed that curl measured for

the complete upload.

content_type The Content-Type of the requested document, if

there was any.

num_connects Number of new connects made in the recent trans-

fer. (Added in 7.12.3)

num_redirects Number of redirects that were followed in the

request. (Added in 7.12.3)

redirect_url When a HTTP request was made without -L to follow

redirects, this variable will show the actual URL

a redirect would take you to. (Added in 7.18.2)

ftp_entry_path The initial path libcurl ended up in when logging

on to the remote FTP server. (Added in 7.15.4)

ssl_verify_result

The result of the SSL peer certificate verifica-

tion that was requested. 0 means the verification

was successful. (Added in 7.19.0)

转载：http://7567567.blog.51cto.com/706378/619842

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