IBM Internal Use Only
At the timing rate of 1 MHz (1 microsecond) provided by Wiring
the Basic Counter Unit, the readings can be converted to: The wiring for this example is shown in Figure 35
Counter 8: 9,926 seconds
Total compute
Counter 9:
1,432 seconds Supervisor
Counter 10:
2,418 seconds
Partition 1
Counter 11: 2,944 seconds
Partition 2
Counter 12:
3,132 seconds
Partition 3
The measured function can
centages:
also be expressed in
per-
Total compute 9,926 seconds 100.00%
Supervisor 1,432 seconds
14.34%
Partition 1 2,418 seconds
24.19%
Partition 2 2,944 seconds
29.45%
Partition 3
3,132 seconds 31.32%
Additional functions may
be derived by using
the
formulas in Example 1. The numeric values shown in this
example are for illustration only and are not to be
interpreted as standard cases.
Summary
The counter results are as follows:
Counter 8:
Counter 9:
Counter 10:
Counter 11:
Counter 12:
Counter 13:
395,044,983
161,597,391
92,214,125
47,014,497
41,501,691
73,941,095
Total elapsed time
Total wait
Total any channel
Total system residence
System residence and wait
Selector channel 1 busy
At a timing rate of 1 MHz (1 microsecond) provided by
the Basic Counter Unit, the readings can be converted to:
Counter 8:
Counter 9:
Counter 10:
Counter 11:
Counter 12:
Counter 13:
395.0 seconds
161.6 seconds
92.2 seconds
47.0 seconds
41.5 seconds
73.9 seconds
Total elapsed time
Total wait
Total any channel
Total system residence
System residence and wait
Selector channel 1 busy
Example 4
The IBM 2314 Direct Storage Facility Model A1 or 1
contains eight separate modules. In a case study, the IBM
System/360 Operating System for an IBM System/360
Model 50 was resident on two 2314 modules.
Objective
Measure the percentage of time that the two system
residence modules of the 2314 are used and the percentage
of time that the CPU is waiting for the system residence
modules. For comparative purposes, measurements are
made of the following other functions: total wait, any
channel busy, selector channel 1 time (2314 residence), and
total elapsed time.
The measured system function can also be expressed in
percentages:
Total elapsed time
395.0 seconds
100.0%
Total wait 161.6 seconds
40.8%
Total any channel
92.2 seconds 23.3%
Total system residence
47.0 seconds
11.9%
System residence and wait
41.5 seconds
10.5%
Selector channel 1 busy
73.9 seconds
18.7%
Because this example measures only a portion of the total
operation (channel time), the individual times do not add
up to the total elapsed time. Other desired functions, such
as compute only, must be calculated by using the formulas
in Example 1. The numeric values shown in the examples
are for illustration only and are not to be interpreted as
standard cases.
28
To Next Page
Loading...
Need help?
General
