Parallel Programming Guide for HP-UX Systems

Glossary
tty buffering
Glossary210
tty buffering A method for efficiently
processing data that is directed to standard
output by capturing it in a buffer before
sending it to the screen.
underflow An exception condition that
occurs when the result of a floating-point
operation is smaller than the smallest
normalized number. On systems that
support it, fast underflow is an efficient
method of handling this exception.
vectorization An optimization technique
that replaces eligible program loops that
operate on arrays with calls to specially
tuned routines that perform the same
operation.
wall-clock time Time spent by an
executing program that includes system
time as well as process time. In contrast,
virtual time takes into account process time
only. Profilers (such as CXperf) that track
both virtual time and wall-clock time provide
information about when a program is
blocked as well as when it is running.