6 measurement techniques, Measurement techniques, Table 6-1 – HP Integrity NonStop H-Series User Manual
Page 45: Maximum values for processors, Section 6, measurement techniques, Section 6, measurement, Techniques
ViewSys User’s Guide— 526358-002
6 -1
6
Measurement Techniques
ViewSys obtains the system resource configuration for each processor being
monitored. For measured entities that have a finite number of blocks or memory pages
available, the actual number configured is determined. For some measurements, such
as DISPATCHES or DISC I/O RATE, an arbitrary maximum has been determined, so
the percentage-used display indicates the remaining percentage of usable resource. In
these cases, the maximum arbitrary configuration can be exceeded, but this indicates
that a threshold has been reached, after which processor efficiency is likely to be
affected.
lists the maximum values selected for the seven processor types. To
estimate what percentage of a particular resource your system is using, compare the
value that ViewSys displays to the maximum value listed in Table 6-1. For example, if
your system is a Cyclone and your CPU queue is 10 (half of the maximum value of 20),
your system is at 50% of maximum capacity.
When the configured amounts have been determined, ViewSys determines the actual
amount of each entity in use once each measurement period. For control blocks, or
pages of memory, the actual number in use is returned. For entities measuring a rate,
such as CACHE HIT RATE, the average number per second during the measurement
period is returned. The CPU BUSY value returned is the actual percentage of the
measurement period that the processor was busy. CPU BUSY is total time less idle
time (total time - idle time).
The technique used to obtain the rates and percentage busy values is similar to that
used by Measure. The current value of a counter being incremented within the
operating system is taken at the beginning of a measurement period. At the end of a
measurement period, the value is taken from the counter, and the beginning value is
subtracted from it. This yields the amount of activity for that entity for that
measurement period. To arrive at the average for the measurement period, the elapsed
time is then divided into this value.
Table 6-1. Maximum Values for Processors
VLX
CLX
600
CLX
700
CLX
800
NSR-L
CLX-R
Cyclone
NSR-N
K10000
CPU QUEUE
14
6
9
12
20
20
20
PAGE FAULT
42
18
28
42
42
126
126
MEMORY QUEUE
13
5
8
11
19
20
20
DISPATCHES
2870
660
1260
1840
2920
6900
11000
CACHE HITS
500
115
250
315
800
1500
2000
DISC I/O
70
26
40
60
60
250
250