IBM 360 Manual page 27

At the timing rate of 1 MHz (1 microsecond) provided by
the Basic Counter Unit, the readings can be converted to:
Counter 8: 9,926 seconds
Counter 9: 1,432 seconds
Counter 10: 2,418 seconds
Counter 11: 2,944 seconds
Counter 12: 3,132 seconds
The measured function can
centages:
Total compute 9,926 seconds
Supervisor 1,432 seconds
Partition 1 2,418 seconds
Partition 2 2,944 seconds
Partition 3 3,132 seconds
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.
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.
28
IBM Internal Use Only
Total compute
Supervisor
Partition 1
Partition 2
Partition 3
also be expressed in per-
100.00%
14.34%
24.19%
29.45%
31.32%
Wiring
The wiring for this example is shown in Figure 35
Summary
The counter results are as follows:
Counter 8: 395,044,983
Counter 9: 161,597,391
Counter 10: 92,214,125
Counter 11: 47,014,497
Counter 12: 41,501,691
Counter 13: 73,941,095
At a timing rate of 1 MHz (1 microsecond) provided by
the Basic Counter Unit, the readings can be converted to:
Counter 8: 395.0 seconds
Counter 9: 161.6 seconds
Counter 10: 92.2 seconds
Counter 11: 47.0 seconds
Counter 12: 41.5 seconds
Counter 13: 73.9 seconds
The measured system function can also be expressed in
percentages:
395.0 seconds
Total elapsed time
Total wait 161.6 seconds
Total any channel 92.2 seconds
Total system residence 47.0 seconds
System residence and wait 41.5 seconds
Selector channel 1 busy 73.9 seconds
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.
Total elapsed time
Total wait
Total any channel
Total system residence
System residence and wait
Selector channel 1 busy
Total elapsed time
Total wait
Total any channel
Total system residence
System residence and wait
Selector channel 1 busy
100.0%
40.8%
23.3%
11.9%
10.5%
18.7%