User's Manual

450 U3585-J-Z125-8-76
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.