Hi Byron,
I recommend the tool grinder (http://grinder.sourceforge.net).
It is simple and does the job (e.g. you can start several
clients to "attack" a certain host). Furthermore you get data
about how many request are being processed per second.

Simple installation:
- install python and jdk
- download grinder
- extract it
- put the attached files in a folder in the grinder home dir
- start proxy and set browser to use proxy at 8001 to
record your actions
- then stop proxy and start console, after that start workers
- use grinder.properties to adjust parameters
grinder.processes=1 (don't change, maybe 2-3)
grinder.threads=3 (how many threads, 3-10)
grinder.runs=20 (how many repetitions)
- start grinder on other machines as well

Regards
Olaf

Files:

-----------start proxy
java -cp ../lib/grinder.jar net.grinder.TCPProxy -httpplugin


--------start console java -cp ../lib/grinder.jar net.grinder.Console


----------start workers java -cp ../lib/grinder.jar net.grinder.Grinder

---------grinder.properties

#
# Example grinder.properties
#
#grinder.jvm.arguments=-Dpython.home=d:/jython/jython-2.1

grinder.processes=1
grinder.threads=3
grinder.runs=20

#grinder.useConsole=false

grinder.logDirectory=log
grinder.numberOfOldLogs=2

grinder.initialSleepTime=600
#grinder.sleepTimeFactor=0.01
#grinder.sleepTimeVariation=0.5

#grinder.script=../examples/http.py
grinder.script=httpscript.py







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