ab(1)ab(1)NAMEab - Apache HTTP server benchmarking tool
SYNOPSISab [ -k ] [ -i ] [ -n requests ] [ -t timelimit ] [ -c
concurrency ] [ -p POST file ] [ -A Authenticate user-
name:password ] [ -P Proxy Authenticate username:password
] [ -H Custom header ] [ -C Cookie name=value ] [ -T con-
tent-type ] [ -v verbosity ] ] [ -w output HTML ] ] [ -x
<table> attributes ] ] [ -y <tr> attributes ] ] [ -z <td>
attributes ] [http://]hostname[:port]/path
ab [ -V ] [ -h ]
DESCRIPTIONab is a tool for benchmarking the performance of your
Apache HyperText Transfer Protocol (HTTP) server. It does
this by giving you an indication of how many requests per
second your Apache installation can serve.
OPTIONS-k Enable the HTTP KeepAlive feature; that is,
perform multiple requests within one HTTP ses-
sion. Default is no KeepAlive.
-i Use an HTTP 'HEAD' instead of the GET method.
Cannot be mixed with POST.
-n requests The number of requests to perform for the
benchmarking session. The default is to per-
form just one single request, which will not
give representative benchmarking results.
-t timelimit
The number of seconds to spend benchmarking.
Using this option automatically set the number
of requests for the benchmarking session to
50000. Use this to benchmark the server for a
fixed period of time. By default, there is no
timelimit.
-c concurrency
The number of simultaneous requests to per-
form. The default is to perform one HTTP
request at at time, that is, no concurrency.
-p POST file
A file containing data that the program will
send to the Apache server in any HTTP POST
requests.
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ab(1)ab(1)-A Authorization username:password
Supply Basic Authentication credentials to the
server. The username and password are sepa-
rated by a single ':', and sent as uuencoded
data. The string is sent regardless of
whether the server needs it; that is, has sent
a 401 Authentication needed.
-p Proxy-Authorization username:password
Supply Basic Authentication credentials to a
proxy en-route. The username and password are
separated by a single ':', and sent as uuen-
coded data. The string is sent regardless of
whether the proxy needs it; that is, has sent
a 407 Proxy authentication needed.
-C Cookie name=value
Add a 'Cookie:' line to the request. The argu-
ment is typically a 'name=value' pair. This
option may be repeated.
-p Header string
Append extra headers to the request. The argu-
ment is typically in the form of a valid
header line, usually a colon separated field
value pair, for example, 'Accept-Encoding:
zip/zop;8bit'.
-T content-type
The content-type header to use for POST data.
-v Sets the verbosity level. Level 4 and above
prints information on headers, level 3 and
above prints response codes (for example, 404,
200), and level 2 and above prints warnings
and informational messages.
-w Print out results in HTML tables. The default
table is two columns wide, with a white back-
ground.
-x attributes
The string to use as attributes for <table>.
Attributes are inserted <table here >
-y attributes
The string to use as attributes for <tr>.
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ab(1)ab(1)-z attributes
The string to use as attributes for <td>.
-V Display the version number and exit.
-h Display usage information.
BUGS
There are various statically declared buffers of fixed
length. Combined with inefficient parsing of the command
line arguments, the response headers from the server, and
other external inputs, these buffers might overflow.
Ab does not implement HTTP/1.x fully; instead, it only
accepts some 'expected' forms of responses.
The rather heavy use of strstr(3) by the program may skew
performance results, since it uses significant CPU
resources. Make sure that performance limits are not hit
by ab before your server's limit is reached.
SEE ALSOhttpd(8)
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