Caché Installation Guide - InterSystems Documentation

B
Calculating System Parameters for
UNIX and Linux
This document is part of the Caché Installation Guide for UNIX and Linux. This document
explains how you can calculate the best parameters for your system. It is divided into two
sections:
• Determine Memory and Disk Requirements—calculate memory requirements, swap
space, disk requirements, maximum buffers, maximum users, and maximum database
size.
• Configure UNIX Kernel Parameters—set values for tunable UNIX parameters and other
platform-specific memory management issues.
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 system
level parameters. The values you choose should minimize swapping and paging that require
disk accesses, 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 tables provided here to record the current and calculated
values for your system level 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.
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