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The Grinder is a load testing framework designed to make it easy to run a distributed test using many load injector machines. Now, you can use this Open Source, Java-based framework to perform the tests you need in no time at all.

Key features:

Generic Approach Load test anything that has a Java API. This includes common cases such as HTTP web servers, SOAP and REST web services, and application servers (CORBA, RMI, JMS, EJBs), as well as custom protocols.
Flexible Scripting Tests are written in the powerful Jython scripting language.
Distributed Framework A graphical console allows multiple load injectors to be monitored and controlled, and provides centralised script editing and distribution.
Mature HTTP Support Automatic management of client connections and cookies. SSL. Proxy aware. Connection throttling. Sophisticated record and replay of the interaction between a browser and a web site.
See the longer features list for further details.