Stress testing tool for ERP application.

Hi all, I am working on some ERP related stuff and wish to create LOAD on my erp server(am using opentaps ). I want to stress it for multiple client
connections(hundereds of them) and heavy trannsactions performed by those clients. Can anybody point me in the right direction and tell me what do i need to do for it. An automated kinda setup will be of gr8 help ..
Thanks in advance ...
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