The work on Geist was motivated by the need to understand the implications of web traffic characteristics on the architectural aspects of a web/e-commerce server. This requires generation of aggregate Internet traffic from a server’s perspective without having to explicity emulate network components or protocols. This server-centric focus also means that client-level aspects of the traffic are relevant only to the extent they affect the aggregate traffic. In particular, the datailed client behavior (e.g. more than 10K requests per second). It is worth nothing in this regard that the traditional socket interface makes overloading web-servers quite difficult. Finally, the increasing dynamic content of web pages makes generation of realistic transaction characteristics particularly challenging, especially in e-commerce environments. Geist, has been designed to deal with these and other important issues.

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