Siemens SM2 monitoring system manual Glossary Interaction, Main memory, Overall performance

Glossary

interaction

Generic term for wait, response, think, and transaction processes (RESPONSETIME monitoring program).

main memory

Memory area which can be addressed directly by the CPU. The program instructions are read and processed in this area.

overall performance

The productive performance and the dilation, i.e. the relation between the time spent in the system (dwell time) and the time required for providing the productive performance, are important criteria for accessing the suitability of a DP system for a given load.

The following definition is used:

Overall performance = productive performance + housekeeping performance

Productive performance is the load handling capacity.

Housekeeping (or overhead) performance is the performance required for system control by the operating system.

Overall performance is the sum of these two quantities.

The performance is provided by the various system components, e.g. the CPU(s) and the peripheral devices.

Performance = work done per unit of time. A precise definition of "work done" is not attempted here. Only the time required for productive or housekeeping performance is considered.

The time equivalent of the productive performance or of the housekeeping performance is the (service) time for which resources are being used for productive work or for housekeeping.

It is also called Resources Service Time (RST).

The dwell time of a task is the sum of the physical resources service times plus all non- voluntary wait times of the task. The non-voluntary wait time of a task is thus a criteria for task obstruction by other tasks in the system.

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