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<manualpage metafile="ab.xml.meta">
<parentdocument href="./">Programs</parentdocument>
<title>ab - Apache HTTP server benchmarking tool</title>
<summary>
<p><code>ab</code> 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
serving.</p>
</summary>
<seealso><program>httpd</program></seealso>
<section id="synopsis"><title>Synopsis</title>
<p><code><strong>ab</strong>
[ -<strong>A</strong> <var>auth-username</var>:<var>password</var> ]
[ -<strong>b</strong> <var>windowsize</var> ]
[ -<strong>B</strong> <var>local-address</var> ]
[ -<strong>c</strong> <var>concurrency</var> ]
[ -<strong>C</strong> <var>cookie-name</var>=<var>value</var> ]
[ -<strong>d</strong> ]
[ -<strong>e</strong> <var>csv-file</var> ]
[ -<strong>f</strong> <var>protocol</var> ]
[ -<strong>g</strong> <var>gnuplot-file</var> ]
[ -<strong>h</strong> ]
[ -<strong>H</strong> <var>custom-header</var> ]
[ -<strong>i</strong> ]
[ -<strong>k</strong> ]
[ -<strong>n</strong> <var>requests</var> ]
[ -<strong>p</strong> <var>POST-file</var> ]
[ -<strong>P</strong> <var>proxy-auth-username</var>:<var>password</var> ]
[ -<strong>q</strong> ]
[ -<strong>r</strong> ]
[ -<strong>s</strong> ]
[ -<strong>S</strong> ]
[ -<strong>t</strong> <var>timelimit</var> ]
[ -<strong>T</strong> <var>content-type</var> ]
[ -<strong>u</strong> <var>PUT-file</var> ]
[ -<strong>v</strong> <var>verbosity</var>]
[ -<strong>V</strong> ]
[ -<strong>w</strong> ]
[ -<strong>x</strong> <var><table>-attributes</var> ]
[ -<strong>X</strong> <var>proxy</var>[:<var>port</var>] ]
[ -<strong>y</strong> <var><tr>-attributes</var> ]
[ -<strong>z</strong> <var><td>-attributes</var> ]
[ -<strong>Z</strong> <var>ciphersuite</var> ]
[http[s]://]<var>hostname</var>[:<var>port</var>]/<var>path</var></code></p>
</section>
<section id="options"><title>Options</title>
<dl>
<dt><code>-A <var>auth-username</var>:<var>password</var></code></dt>
<dd>Supply BASIC Authentication credentials to the server. The username and
password are separated by a single <code>:</code> and sent on the wire
base64 encoded. The string is sent regardless of whether the server needs
<dt><code>-b <var>windowsize</var></code></dt>
<dt><code>-B <var>local-address</var></code></dt>
<dd>Address to bind to when making outgoing connections.</dd>
<dt><code>-c <var>concurrency</var></code></dt>
<dd>Number of multiple requests to perform at a time. Default is one
request at a time.</dd>
<dt><code>-C <var>cookie-name</var>=<var>value</var></code></dt>
<dd>Add a <code>Cookie:</code> line to the request. The argument is
typically in the form of a <code><var>name</var>=<var>value</var></code>
pair. This field is repeatable.</dd>
<dt><code>-d</code></dt>
<dd>Do not display the "percentage served within XX [ms] table". (legacy
support).</dd>
<dt><code>-e <var>csv-file</var></code></dt>
<dd>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'.</dd>
<dt><code>-f <var>protocol</var></code></dt>
<dt><code>-g <var>gnuplot-file</var></code></dt>
<dd>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. </dd>
<dt><code>-h</code></dt>
<dd>Display usage information.</dd>
<dt><code>-H <var>custom-header</var></code></dt>
<dd>Append extra headers to the request. The argument is typically in
the form of a valid header line, containing a colon-separated field-value
<dt><code>-i</code></dt>
<dd>Do <code>HEAD</code> requests instead of <code>GET</code>.</dd>
<dt><code>-k</code></dt>
requests within one HTTP session. Default is no KeepAlive.</dd>
<dt><code>-n <var>requests</var></code></dt>
<dd>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 results.</dd>
<dt><code>-p <var>POST-file</var></code></dt>
<dd>File containing data to POST. Remember to also set <code>-T</code>.</dd>
<dt><code>-P <var>proxy-auth-username</var>:<var>password</var></code></dt>
<dd>Supply BASIC Authentication credentials to a proxy en-route. The
username and password are separated by a single <code>:</code> and sent on
the wire base64 encoded. The string is sent regardless of whether the
needed).</dd>
<dt><code>-q</code></dt>
<dd>When processing more than 150 requests, <code>ab</code> outputs a
progress count on <code>stderr</code> every 10% or 100 requests or so. The
<code>-q</code> flag will suppress these messages.</dd>
<dt><code>-r</code></dt>
<dd>Don't exit on socket receive errors.</dd>
<dt><code>-s</code></dt>
<dd>When compiled in (<code>ab -h</code> will show you) use the SSL
protected <code>https</code> rather than the <code>http</code> protocol.
This feature is experimental and <em>very</em> rudimentary. You probably
do not want to use it.</dd>
<dt><code>-S</code></dt>
<dd>Do not display the median and standard deviation values, nor display
one or two times the standard deviation apart. And default to the
<dt><code>-t <var>timelimit</var></code></dt>
<dd>Maximum number of seconds to spend for benchmarking. This implies a
<code>-n 50000</code> internally. Use this to benchmark the server within a
fixed total amount of time. Per default there is no timelimit.</dd>
<dt><code>-T <var>content-type</var></code></dt>
<dt><code>-u <var>PUT-file</var></code></dt>
<dd>File containing data to PUT. Remember to also set <code>-T</code>.</dd>
<dt><code>-v <var>verbosity</var></code></dt>
<dd>Set verbosity level - <code>4</code> and above prints information on
headers, <code>3</code> and above prints response codes (404, 200, etc.),
<code>2</code> and above prints warnings and info.</dd>
<dt><code>-V</code></dt>
<dd>Display version number and exit.</dd>
<dt><code>-w</code></dt>
<dd>Print out results in HTML tables. Default table is two columns wide,
with a white background.</dd>
<dt><code>-x <var><table>-attributes</var></code></dt>
<dd>String to use as attributes for <code><table></code>. Attributes
are inserted <code><table <var>here</var> ></code>.</dd>
<dt><code>-X <var>proxy</var>[:<var>port</var>]</code></dt>
<dd>Use a proxy server for the requests.</dd>
<dt><code>-y <var><tr>-attributes</var></code></dt>
<dd>String to use as attributes for <code><tr></code>.</dd>
<dt><code>-z <var><td>-attributes</var></code></dt>
<dd>String to use as attributes for <code><td></code>.</dd>
<dt><code>-Z <var>ciphersuite</var></code></dt>
</dl>
</section>
<section id="bugs"><title>Bugs</title>
<p>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.</p>
of responses. The rather heavy use of <code>strstr(3)</code> shows up top
would measure the <code>ab</code> performance rather than the server's.</p>
</section>
</manualpage>