Follow these instructions to configure memory overload
protection from the administrative console.
About this task
To protect against memory overload, the memory overload protection
must initially discover the maximum rate, that is, calls per second,
that can be sustained without exceeding the maximum percentage of
the maximum heap size. As it is discovering the maximum rate, memory
overload protection slowly allows more traffic through without affinity,
but will reject the remainder. Initially, a potentially large number
of HTTP requests or SIP messages without affinity will be rejected
with a 503 (unless the error code is changed).
WebSphere Virtual Enterprise persists the maximum
rate across server restarts, so it must discover the maximum rate
once. The maximum rate can change over time due to changes in the
session or dialog lifetimes, but these lifetimes generally change
relatively slowly and memory overload protection is able to react
to such changes. When discovering the maximum rate,
WebSphere Virtual Enterprise must keep the rate
relatively steady for at least an averaging window. The averaging
window must be at least as long as the lifetime of most of the HTTP
sessions, SIP dialogs, or application sessions.
Memory
overload protection is disabled by default. To enable, follow these
steps from the administrative console: