Operating System Overhead (Cont)

Maybe multi-threading is better?

Problem - Inter-thread communications costs. Usage of central data structures requires thread synchronization, which also costs something.

Solution 1: use multi-threading mostly when no client-to-client forwarding is required.

Solution 2: access globally-used data structures in one big copy operation, rather then in many small read operations.

Solution 3: use 'one writer - multiple readers' locks wherever possible.