Sun Java System Web Server 7.0 Update 7 Performance Tuning, Sizing, and Scaling Guide

Low Latency and High Concurrency Modes

The server can run in one of two modes, depending upon the load. It changes modes to accommodate the load most efficiently.

When the server is started, it starts in low latency mode. When the load increases, the server moves to high concurrency mode. The decision to move from low latency mode to high concurrency mode and back again is made by the server, based on connection queue length, average total sessions, average idle sessions, and currently active and idle sessions.