Period Proportional Aggregate Speed Plot

SRM uses the proportional aggregate speed plot to assess the effects of processor access or storage allocation changes for served service classes. Proportional aggregate speed is similar to velocity. Proportional aggregate speed applies to service class periods that are served while velocity applies to service class periods that are not served. The units for proportional aggregate speed are the same units as for velocity:

The samples are an aggregate of the samples of all internal server service classes that serve the service class. The server samples are apportioned to the served classes based on the relative amount of time, also determined by state sampling, that the server is serving the service class.

The period proportional aggregate speed plot is recorded in subtype 3 records for served service class periods.