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Stage
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Figure 10. General monitoring process
Configuring Performance Toolkit for VM
Though Performance Toolkit for VM comes with z/VM, it is an optional feature in
a disabled state. If you decide to use this feature, you must place an order for it so
that you can enable it. This document assumes you have installed Performance
Toolkit for VM according to Program Directory for Performance Toolkit for VM.
Additional setup is required.
124
z/VM: Getting Started with Linux on System z
Description
You use the CP privileged command MONITOR to control monitoring,
including the type, amount, and nature of data to be collected.
An application program running in a CMS virtual machine connects to the CP
*MONITOR System Service to establish a data link with CP.
The monitor collects performance data during CP operation and stores it, in the
form of monitor records, in a saved segment (MONDCSS).
Note: MONDCSS is already defined for you during system installation.
An IBM-supplied program called MONWRITE retrieves monitor records from
the saved segment and processes them. MONWRITE can store monitor records
on disk or tape.
An application program, such as Performance Toolkit for VM, can read data
from the saved segment to display real-time performance characteristics.
Performance Toolkit for VM can also process monitor data records written to
disk or tape by MONWRITE. While processing monitor data, Performance
Toolkit for VM can generate historical monitor data that it can process at a later
time.
3
MONITOR
command
1
Monitor facility
Saved segment (MONDCSS)
4
2
CMS user MONWRITE
system
events
CP
5
Performance
Toolkit for
VM
MONWRITE
application
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