Caché Installation Guide - InterSystems Documentation

OpenVMS System Parameter Values
Analyzing the Calculation Results
Parameter
Current value
Required Caché
amount
Resulting value
BALSETCNT
MAXPROCESSCNT
GBLPAGES
GBLPAGFIL
GBLSECTIONS
SYSMWCNT
LOCKIDTBL
RESHASHTBL
The parameter calculator also provides the following values:
• Cache Fixed SHMEM req — a fixed value used in the calculator computations; it is for informational
purposes only.
• Resident Memory requirement — total shared memory required by this Caché instance, including
an amount for the generic memory heap (gmheap) for a standard installation. If you increase
gmheap, you may need to increase the resident memory requirement.
Caché does not require you to reserve a named memory-resident section; see the Update Resident
Memory section for details.
A.6.3 Update Resident Memory
If the total required shared memory is more than 5 MB (true of most installations), Caché automatically
allocates all memory from resident memory. Caché does not require you to reserve a named memoryresident
section, but be sure to update the GBLPAGES and GBLPAGFIL parameters as the calculator
indicates. Although this memory is not pageable, OpenVMS requires sufficient GBLPAGFIL and still
deducts GBLSECTION pages.
In OpenVMS, reserved sections can be either named sections that you create with SYSMAN and have
a fixed size or resident sections, which include reserved sections, but can also be “anonymous.”
The following are the advantages of reserving a named section:
• On a system with multiple instances, the named sections reserve memory for the various instances;
therefore you are certain the memory is available.
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