Caché Installation Guide - InterSystems Documentation

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Calculating System Parameters for
OpenVMS
This document is part of “Installing Caché on OpenVMS.” It explains how you can calculate the best
parameter values for your system.
For optimal Caché performance, you need to calculate proper values for certain Caché system parameters.
These values allow you to determine whether you need to adjust certain OpenVMS system
parameters. The values you choose should minimize swapping and paging that require disk access,
and thus improve system performance.
Review this section carefully and calculate the proper values for both your operating system and Caché
before proceeding. Use the OpenVMS Parameter Calculator and the tables provided here to record
the current and calculated values for your system parameters. You can then refer to these tables when
you install Caché. After your system is running, you may need to adjust these values to gain optimal
performance.
If you are not already familiar with the memory organization at your operating system level, consult
the appropriate system documentation and read the overviews of process and physical memory allocation
provided in the next few sections:
• OpenVMS Process Memory Organization
• OpenVMS Page Organization
• OpenVMS Physical Memory Allocation
• How Caché Uses OpenVMS Memory
Once you are familiar with OpenVMS memory organization, use the following sections to tune the
parameters for Caché:
• Calculating OpenVMS Parameters
Caché Installation Guide 67