User's Manual

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Glossary
software service time (DCS)
See “service times definition (DCS, I/O operations)” on page 455.
software service time (non-DCS)
The software service time (also called software duration) is obtained by adding the
waiting time of an input/output request in the device queue of the system to the
hardware duration (see “hardware service time (non-DCS)” on page 449).
task queues
DQT Device Queue Time HW TIME Hardware service time
FPT Function Pending Time FW TIME Firmware service time
DDT Device Disconnect Time SW TIME Software service time
DCT Device Connect Time
RST Remaining Service Time
Q0 A task is in this queue when it is using the CPU.
Q1 Tasks in this queue are waiting to use the CPU.
Q2 This is the queue for the SM2 write task.
Q3 Tasks waiting for end of paging.
Q4 Tasks waiting for peripheral I/O termination (disk, tape), for task communication
events (boursing, ITC), or for VPASS where msec is specified.
Q5 Ready tasks waiting to become active again.
Q6 .Ready tasks waiting to be admitted (PCS).