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ab - Apache HTTP server benchmarking tool ab [ -k ] [ -n " requests" ] [ -t " timelimit" ] [ -c " concurrency" ] [ -p " POST file" ] [ -A " Authenticate username:password" ] [ -P " Proxy Authenticate username:password" ] [ -H " Custom header" ] [ -C " Cookie name=value" ] [ -T " content-type" ] [ -v " verbosity" ] ] [ -w " output HTML" ] ] [ -x " <table> attributes" ] ] [ -y " <tr> attributes" ] ] [ -z " <td> attributes" ] [http://]hostname[:port]/path ab [ -V ] [ -h ]

ab is a tool for benchmarking your Apache HyperText Transfer Protocol (HTTP) server. It is designed to give you an impression on how performant is your current Apache installation. This especially shows you how much requests per time your Apache installation is capable to serve.

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

12 -n " requests" Number of requests to perform for the benchmarking session. The default is to just perform one single request which usually leads to not very representative benchmarking results.

12 -t " timelimit" Seconds to max. spend for benchmarking. This implies a -n 50000 internally. Use this to benchmark the server within a fixed total amount of time. Per default there is no timelimit.

12 -c " concurrency" Number of multiple requests per time to perform. Default is one request per time.

12 -p " POST file" File containing data to POST.

12 -A " Authorization username:password" Supply BASIC Authentification credentials to the server. The username and password are separated by a single ':' and send on the wire uuencoded. The string is send regardless of wether the server needs it; (i.e. has send an 401. Authentifcation needed).

12 -p " Proxy-Authorization username:password" Supply BASIC Authentification credentials to a proxy en-route. The username and password are separated by a single ':' and send on the wire uuencoded. The string is send regardless of wether the proxy needs it; (i.e. has send an 407 Proxy authentifcation needed).

12 -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.

12 -p " Header string" Postfix 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').

12 -T " content-type" Content-type header to use for POST data.

12 -v 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.

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

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

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

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

12 -V Display version number and exit.

12 -h Display usage information.

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.

httpd(8) .