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SOFTWARE PRODUCT DESCRIPTION

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PRODUCT NAME: VAX/VMS Operating System, Version 4.2

DESCRIPTION

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System Overview

€ The VAX/VMS Operating System supports all VAX series  computers,
working reliably and refficiently in both time-sharing and
production environments. Time-sharing users can work
interactively with the system and can submit batch jobs. Jobs of
all types, including processor intensive,  I/0 intensive, large
memory, and real-time, in any mix, perform well on VAX/VMS. The
System permits nan absolute limit of 8192 concurrent process.
However, the actual amount of work supported at one time with
good performance depends' ori the types of processing performed as:
well das on the physical memory and secondary storage  avaliable,
The practical limit, with moderate per-user workloads, 'is in
excess of 100 concurrent users for a large scale. system.

. System Configuration s maz -

The user receives with VAX/VMS a standard system  cconfiguration

€ file and da site-independent start-up procedure. The user can
modify the site-independent start-up procedure or create a site-
specific start-up procedure. To start the system, the user
performs a bootstrap operation. Optionally, the parameter values
of the selected file can be modified at bootstrap time. The
system configures itself by executing the start-up procedures.
After. system start-up, the user can reset system parameter values
on-line for the next bootstrap operation and can dynamically
change a  subset of the parameter values, i.e., change the
configuration of the running system.

To aid the user in setting up system parameters, a procedure is
provided that analyzes the system configuration and generates a
file containing parameter settings. This file can be modified by
the user and a system parameter file generated. In addition, the
system incorporates self-tuning mechanisms. For example, the
system monitors job performance and increases the amount of
physical memory for jobs that need it and decreases the amount