Friday, August 24, 2007

NIO q&&a

Prerequisite: blocking. See other posts

Q: Typically, how many active clients can an NIO server support?
A: thousands for a single-thread NIO server

Q: How about traditional IO?
A: typically hundreds

Q: can we have a single-thread server in traditional IO? P221
A: no. when data is unavailable on the socket, the server thread would "block" and stop doing anything at all. Since there are no other threads to do anything either, the entire server freezes up in waiting, ignoring any events or signals or inputs.

Q: basic NIO server uses a single thread or multiple threads?
A: p 233

Q: in traditional IO, what's the threading, session, socket ... allocation?
A: each client is linked to a server socket, a thread.

Q: why traditional io supports limited number of clients?
A: threads can't multiply infinitely. (No real limit on sockets.). P227 shows 2nd reason

Q: problem of thread pool?
A: thousands of active clients would require same size (heavy!) of thread pool!

Q: in one sentence, explain a major complexity in NIO programming. P232

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