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AB(1)						ab					    AB(1)

       ab - Apache HTTP server benchmarking tool

       ab [ -A auth-username:password ] [ -b windowsize ] [ -B local-address ] [ -c concurrency ]
       [ -C cookie-name=value ] [ -d ] [ -e csv-file ] [ -f protocol ] [ -g gnuplot-file ] [ -h ]
       [  -H custom-header ] [ -i ] [ -k ] [ -n requests ] [ -p POST-file ] [ -P proxy-auth-user-
       name:password ] [ -q ] [ -r ] [ -s timeout ] [ -S ] [ -t timelimit ] [ -T content-type ] [
       -u  PUT-file ] [ -v verbosity] [ -V ] [ -w ] [ -x <table>-attributes ] [ -X proxy[:port] ]
       [ -y <tr>-attributes ] [  -z  <td>-attributes  ]  [  -Z	ciphersuite  ]	[http[s]://]host-

       ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is
       designed to give you an impression of how your current Apache installation performs.  This
       especially  shows  you how many requests per second your Apache installation is capable of

       -A auth-username:password
	      Supply BASIC Authentication credentials to the server. The  username  and  password
	      are separated by a single : and sent on the wire base64 encoded. The string is sent
	      regardless of whether the server needs it (i.e., has  sent  an  401  authentication

       -b windowsize
	      Size of TCP send/receive buffer, in bytes.

       -B local-address
	      Address to bind to when making outgoing connections.

       -c concurrency
	      Number of multiple requests to perform at a time. Default is one request at a time.

       -C cookie-name=value
	      Add  a  Cookie:  line  to  the  request. The argument is typically in the form of a
	      name=value pair. This field is repeatable.

       -d     Do not display the "percentage served within XX [ms] table". (legacy support).

       -e csv-file
	      Write a Comma separated value (CSV) file which contains for each	percentage  (from
	      1%  to  100%)  the  time	(in milliseconds) it took to serve that percentage of the
	      requests. This is usually more useful than the 'gnuplot' file; as the  results  are
	      already 'binned'.

       -f protocol
	      Specify SSL/TLS protocol (SSL2, SSL3, TLS1, or ALL).

       -g gnuplot-file
	      Write  all  measured  values  out as a 'gnuplot' or TSV (Tab separate values) file.
	      This file can easily be imported into packages like Gnuplot, IDL, Mathematica, Igor
	      or even Excel. The labels are on the first line of the file.

       -h     Display usage information.

       -H custom-header
	      Append  extra  headers  to  the request. The argument is typically in the form of a
	      valid header line, containing a colon-separated field-value  pair  (i.e.,  "Accept-
	      Encoding: zip/zop;8bit").

       -i     Do HEAD requests instead of GET.

       -k     Enable  the HTTP KeepAlive feature, i.e., perform multiple requests within one HTTP
	      session. Default is no KeepAlive.

       -n requests
	      Number of requests to perform for the benchmarking session. The default is to  just
	      perform  a  single  request  which usually leads to non-representative benchmarking

       -p POST-file
	      File containing data to POST. Remember to also set -T.

       -P proxy-auth-username:password
	      Supply BASIC Authentication credentials to a proxy en-route. The username and pass-
	      word are separated by a single : and sent on the wire base64 encoded. The string is
	      sent regardless of whether the proxy needs it (i.e., has sent an 407 proxy  authen-
	      tication needed).

       -q     When processing more than 150 requests, ab outputs a progress count on stderr every
	      10% or 100 requests or so. The -q flag will suppress these messages.

       -r     Don't exit on socket receive errors.

       -s timeout
	      Maximum number of seconds to wait before the socket times out. Default is  30  sec-

       -S     Do  not  display	the  median  and standard deviation values, nor display the warn-
	      ing/error messages when the average and median are more than one or two  times  the
	      standard deviation apart. And default to the min/avg/max values. (legacy support).

       -t timelimit
	      Maximum number of seconds to spend for benchmarking. This implies a -n 50000 inter-
	      nally. Use this to benchmark the server within a fixed total amount  of  time.  Per
	      default there is no timelimit.

       -T content-type
	      Content-type  header  to	use  for POST/PUT data, eg. application/x-www-form-urlen-
	      coded. Default is text/plain.

       -u PUT-file
	      File containing data to PUT. Remember to also set -T.

       -v verbosity
	      Set verbosity level - 4 and above prints information on headers, 3 and above prints
	      response codes (404, 200, etc.), 2 and above prints warnings and info.

       -V     Display version number and exit.

       -w     Print  out  results in HTML tables. Default table is two columns wide, with a white

       -x <table>-attributes
	      String to use as attributes for <table>. Attributes are inserted <table here >.

       -X proxy[:port]
	      Use a proxy server for the requests.

       -y <tr>-attributes
	      String to use as attributes for <tr>.

       -z <td>-attributes
	      String to use as attributes for <td>.

       -Z ciphersuite
	      Specify SSL/TLS cipher suite (See openssl ciphers)

       The following list describes the values returned by ab:

       Server Software
	      The value, if any, returned in the server  HTTP  header  of  the	first  successful
	      response.  This includes all characters in the header from beginning to the point a
	      character with decimal value of 32 (most notably: a space or CR/LF) is detected.

       Server Hostname
	      The DNS or IP address given on the command line

       Server Port
	      The port to which ab is connecting. If no port is given on the command  line,  this
	      will default to 80 for http and 443 for https.

       SSL/TLS Protocol
	      The protocol parameters negotiated between the client and server. This will only be
	      printed if SSL is used.

       Document Path
	      The request URI parsed from the command line string.

       Document Length
	      This is the size in bytes of the first successfully returned document. If the docu-
	      ment length changes during testing, the response is considered an error.

       Concurrency Level
	      The number of concurrent clients used during the test

       Time taken for tests
	      This  is	the  time taken from the moment the first socket connection is created to
	      the moment the last response is received

       Complete requests
	      The number of successful responses received

       Failed requests
	      The number of requests that were considered a failure. If  the  number  is  greater
	      than  zero, another line will be printed showing the number of requests that failed
	      due to connecting, reading, incorrect content length, or exceptions.

       Write errors
	      The number of errors that failed during write (broken pipe).

       Non-2xx responses
	      The number of responses that were not in the 200 series of response codes.  If  all
	      responses were 200, this field is not printed.

       Keep-Alive requests
	      The number of connections that resulted in Keep-Alive requests

       Total body sent
	      If  configured  to send data as part of the test, this is the total number of bytes
	      sent during the tests. This field is omitted if the test did not include a body  to

       Total transferred
	      The  total number of bytes received from the server. This number is essentially the
	      number of bytes sent over the wire.

       HTML transferred
	      The total number of document bytes received from the server. This  number  excludes
	      bytes received in HTTP headers

       Requests per second
	      This is the number of requests per second. This value is the result of dividing the
	      number of requests by the total time taken

       Time per request
	      The average time spent per request. The first value is calculated with the  formula
	      concurrency * timetaken * 1000 / done while the second value is calculated with the
	      formula timetaken * 1000 / done

       Transfer rate
	      The rate of transfer as calculated by the formula totalread / 1024 / timetaken

       There are various statically declared buffers of fixed  length.	Combined  with	the  lazy
       parsing	of  the  command  line	arguments, the response headers from the server and other
       external inputs, this might bite you.

       It does not implement HTTP/1.x fully; only accepts some 'expected' forms of responses. The
       rather  heavy use of strstr(3) shows up top in profile, which might indicate a performance
       problem; i.e., you would measure the ab performance rather than the server's.

Apache HTTP Server			    2013-01-09					    AB(1)
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