Expand Configuration and Management Manual (H06.21+, J06.10+)

Tuning
Expand Configuration and Management Manual — 529522-013
19 - 27
Using Measure
Determining Processor Use
To determine the processor use of an Expand line-handler process, you must add a
fraction of the Intr-Busy-Time count from the processor where the Expand line-handler
process is running to the Cpu-Busy-Time value for the Expand line-handler process.
This fraction can be estimated using this formula:
PROCESS-Dispatches
is the value shown in the Dispatches counter of the PROCESS entity display.
CPU-Dispatches
is the value shown in the Dispatches counter of the CPU entity display.
Intr-Busy-Time
is a counter shown in the CPU entity display.
Send-Busy-Time
is a counter shown in the CPU entity display.
For example, you can use this values from the PROCESS entity and CPU entity
displays shown above to determine the processor use of process $PATHF running in
processor 2:
•
CPU-Busy-Time = 31.20%
•
Process Dispatches = 48.13
•
CPU Dispatches = 51.00
•
CPU Intr-Busy-Time = 13.24%
•
CPU Send-Busy-Time = 4.64%
Using the formula shown above, the adjusted processor use for $PATHF is 39.32%, as
reached from this formula:
For a complete accounting of Expand line-handler process overhead, the network
control process ($NCP) and Expand manager process ($ZEXP) should also be
measured. $NCP activity is relatively fixed and depends on network size, configuration,
and the quality of the transmission lines. Because the activity of $NCP is not directly
related to the amount of traffic, it is not necessary to account for it when sizing or
tuning a path.
(PROCESS-Dispatches / CPU-Dispatches) * (Intr-Busy-Time - Send-Busy-Time)
31.20 + ((48.13 / 51.00) * (13.24 - 4.64)) = 39.32