Internet Information Services (IIS) 7.0 Resource Kit

Implementing Process Gating

By design, when you create a new Web site in IIS 7.0 via IIS Manager, a new application pool with the same name as the Web site name is created automatically. This sandbox initiative aims to secure and isolate the new application for both security and availability so that it has a dedicated application pool and dedicated worker processes. This simplifies administration, especially in a shared hosting environment, so that administrators do not need to manually create a new application pool for the Web site. On the other hand, as more Web sites are created, more worker processes will be running at the same time. Without careful capacity planning, Web server performance may suffer when too many worker processes are running ...