processmodel

I have been googling this question for some time but got no answers. What's the Apache process model? By process model, I mean how Apache manage process or thread to handling HTTP request. Does it fork one process for each HTTP request? Does it have process/thread pool? Can we config it? Is there any online doc for such Apache details? This depends on your system and configuration : see Core Features and Multi-Processing Modules : you could use, for instance : Apache MPM winnt on windows -- that one uses threads Or Apache MPM prefork -- that one uses processes Or even Apache MPM worker --

Looking at the processmodel element in the Web.Config there are two attributes. maxWorkerThreads="25" maxIoThreads="25" What is the difference between worker threads and I/O threads? Fundamentally not a lot, it's all about how ASP.NET and IIS allocate I/O wait objects and manage the contention and latency of communicating over the network and transferring data. I/O threads are set aside as such because they will be doing I/O (as the name implies) and may have to wait for "long" periods of time (hundreds of milliseconds). They also can be optimized and used differently to take advantage of I/O