Server Design Issues(Cont) Iterative vs. concurrent -Iterative server handles one request at a time -If another request arrives while the server is busy handling an existing request, the new request has to wait Iterative servers are easier to design, implement and maintain Iterative server is not good for a service with a long request processing time -Concurrent server handles multiple requests concurrently It can decrease the response time It can achieve high performance on a server with multiple processors It can achieve high performance by overlapping processing and IO 99 Server Design Issues (Cont.) • Iterative vs. concurrent —Iterative server handles one request at a time. —If another request arrives while the server is busy handling an existing request, the new request has to wait. • Iterative servers are easier to design, implement, and maintain. • Iterative server is not good for a service with a long “request processing time”. —Concurrent server handles multiple requests concurrently. • It can decrease the response time. • It can achieve high performance on a server with multiple processors. • It can achieve high performance by overlapping processing and I/O