VM/370 Measurement Facility (Monitor)
The V8/370 measurement facility (monitor)
and recording capabilties of the monitor.
extends the data collection
These capabilities include: • The gathering of additional devices, storage. processing.
data related to the utilization of
alternate
T ... , - paths, and • The capability for the system programmer to select devices for which
seek infor.ation is to be collected • Extensions to the capability of the system programmer to specify when
the V8/370 menitor is to close the monitor spool file
The following modifications have been made to the V8/370 measurement facility:
CHANNEL AND DEVICE UTILIZATION The V8/370 monitor gathers additional data related to the utilization of
channels, contrel units, and devices. A high frequency sampler gathers
utilization data which itself is sampled by the tASTAP class of data
collection. STORAGE UTILIZATION During CP initialization, V8/370 informs the systea operator of the
partitioning of storage used by V8/370. The message sent to the
operator specifies the size of the nucleus, the size of the initial dynamic area, the size of the trace table, and the amount of available
free storage. The V8/370 monitor also records this information in the
header record of the Y8/370 monitor spool file.
ALTERNATE PATH STATISTICS The Y8/370 monitor now gathers data that provides information about the
use of alternate I/O paths. The monitor collects and records: • The number of times an SIO instruction was issued on an alternate
path • The number of times a related I/O block was queued or dequeued • The number of times a related I/O block stack was depleted
1-12 IB8 Y8/370 Release 6 Guide

IP/UP USAGE During initialization cn the VM/370 monitor# V8/370 stores the logical
address of the processor and the logical address of the attached
processor into the V8/370 monitor spool file header record. When USER class of data, the V5/370 monitor now records the logical address of the last processor to service the user. The VM/370 monitor also records this information in the monitor record for the SCHEDULE class at queue drop time. SELECTIVE SEEKS An installaticn that uses the
device for which seek related DASD devices for which no seek INCLUDE and EXLCUDE, have been
reflect this enhancement. VM/370 monitor can now specify the DASD information is to te coiiected, or information is desired. Two new options,
added to the CP BOWITOR SEEKS command to MONITOR-TO-DISK SUPPORT FOR REAL TIME The system programmer can now request that the VB/370 monitor close the monitor spool file after a specified number of .onitor samples bas been made; be does this via the LIMIT operand of the SISSON macro instruction
which has been updated. Similarly changed is the tI!IT option of the CP MONITOR command. In addition, the minimum sample interval for the USER, and DASTAP monitor classes is reduced fr08 30 seconds to
5 seconds. This new support enables more frequent and regular real time data reduction of the monitor spool file. SRL AND PROGRAM LOGIC PUBLICATIONS The following publications contain information on the VB/370 measurement
facility(monitor): GC20-1801 Planning and System Generation Guide GC20-1806 Operator's Guide GC20-1807 System Programmer's Guide GC20-1808 System Messages SY20-0884 Data Areas and Control Block Logic SY20-0886 System Logic and Problem Determination Guide, Vol. 1
Section 1. Summary of Changes to the VB/370 System 1-13