HPjmeter 4.3 User's Guide

SSL Secure Sockets Layer
stop-the-world
time
Duration of a full garbage collection where processing stops during the collection time.
thrashing Excessive paging due to a disparity between physical memory actually available to the application
and the specified maximum size for memory usage.
thread spectrum When profiling, the distribution of thread lifetime over the possible thread states.
time slice Time slice entries represent the life span of the current monitoring session for an application. You
can view data throughout the life span of a time slice.
train Optional structure within the heap that is intermediate between the eden space and the old space.
The train is a related collection of smaller memory spaces (cars) that have garbage collected
incrementally according to the train algorithm.
train algorithm Mathematical formula that describes incremental garbage collection of related old objects. The
purpose of train garbage collection is to reduce the length of pause due to GC that is visible to
users of the software.
visualizer The pop-up screens where you see graphical or tabular displays of data. Visualizers provide
contextual controls based on the data displayed. See Using Visualizer Tool Bars (page 201)
young generation New and/or short-lived objects in the heap. Usually garbage collections are done frequently in
the young generation by scavenging the eden space.
226 Glossary