HyperSPI Performance Assessment Guidelines


A number of factors affect VMS system performance, either alone or in relationship to others.

In a virtual memory operating system one of the most critical factors is the relationship between physical memory and on-disk page (swap) space. When physical memory becomes constrained (either on a per-process - in the VMS environment, or on a system-wide basis) performance becomes a function of the frequency and efficiency of paging to external storage.

Insufficient physical memory for the tasks being undertaken is indicated when a system is encountering poor or patchy responsiveness coupled with related, excessive paging to disk.

Poor performance assumes a number of forms, depending on the expectations of the user of a system, as well as the demands being placed on that system.

More Information?

See bookreader document Guide to OpenVMS System Performance.