NET/MASTER Network Control Language (NCL) Programmer's Guide

Factors Affecting Panel Description File Location
Working With Panels
14–16 106160 Tandem Computers Incorporated
that are loaded by reference are displayed with a status of LOADED by the SHOW
PANELS command; those that are explicitly preloaded are displayed with a status of
PRELOADED.)
Keeping the active panel queue allows panel description files that may be used
frequently over short periods of time to have a high probability of retention in
memory between display requests. The purpose of the active panel queue is to limit
the amount of disk I/O activity required to display panels.
For panel description files loaded by reference, the value set by the SYSPARMS
MAXPANEL command determines the maximum number of panels in the queue.
Panel Services uses three factors to determine whether a panel description file loaded
by reference is dropped off the active panel queue. These are length of time in the
queue, the amount of use a panel description file receives, and the size of the queue.
Note For panel description files loaded by reference, setting SYSPARMS MAXPANEL to 0 allows you to store
an unlimited number in the active panel queue.
The value set by the SYSPARMS MAXPANEL command does not restrict the number
of preloaded panel description files that you can store in the active panel queue. The
number of preloaded panel description files is restricted only by the physical limits of
your system. (The maximum number of panel description files that can be stored in
the active panel queue is equal to the value set by the SYSPARMS MAXPANEL
command plus those that have been preloaded by using the SYSPARMS PPRELOAD
command.)
Note Logically, there is only one active panel queue. In practice, all NonStop NET/MASTER MS Guardian
processes that support NCL—and, therefore, Panel Services—support a queue. The number of queues,
therefore, depends on the way you have configured the operating mode of your NonStop NET/MASTER
MS system—basic, extended basic, or advanced. Refer to the NonStop NET/MASTER MS System
Management Guide for more information on operating modes.
One copy of every preloaded panel description file is kept in every active panel queue in every Guardian
process that supports NCL. Additional panel description files in the active panel queues may vary from
Guardian process to Guardian process: it depends on the panel description files that have been used in a
specific Guardian process. The display from the SHOW PANELS command, therefore, may differ from
user to user.