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Introduction to the Spooler
Why Use the Spooler?
Different applications (in addition to your own) can send output to the same printer at
the same time. The spooler saves each job on the print queue and sends them to the
printer depending on their priority.
The spooler protects your applications from any device-dependent considerations. You
don't need to know the technical specifications for each printer. For example, to print a
job on a specific printer, you only need to know the spooler location associated with the
printer (such as $S.#LP for a line printer).
Spooler Components
The spooler consists of processes, output devices, and routing structures:
Spooler Term
Spooler
supervisor
Collector
process
Print process
Device
Routing
structure
Job
Peruse
Spoolcom
Definition
Process (usually named $SPLS) that monitors and communicates with the
other spooler processes and controls printing of spooler jobs. Each spooler
has one supervisor.
Process that accepts output from applications and stores it on disk. Each
spooler must include at least one, but no more than 15, collectors.
Process that retrieves a spooler job stored on disk by a collector process and
prints the job to an output device. Each printer in the spooler has one print
process associated with it; however, each print process can control several
output devices.
Physical device (printer), process, or virtual device to which output is
directed. Output devices are components of the system, not of the spooler.
Structure that directs jobs to output devices and consists of a set of
locations and print devices.
Set of data sent to the spooler to be printed.
Utility that lets you control and monitor your jobs. You enter Peruse
commands interactively from your terminal. See
Your Spooler Jobs Using
Utility that lets a system operator create, initialize, and get status for spooler
components, set job attributes, and start a printer that is offline. See
Section 14, Performing Routine Spooler Operations Using
Guardian User's Guide —425266-001
Peruse.
12- 2
Why Use the Spooler?
Section 13, Managing
Spoolcom.
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