Subsystem Control Point (SCP) Management Programming Manual

Tr ac ing
Subsystem Control Point (SCP) Management Programming Manual—520619-001
B-2
Tracing Overview
Tracing Overview
Use the TRACE command to keep a record of an object’s activity (messages sent and
received, for example). The subsystem process that controls the object performs the
trace. If requested by the subsystem, SCP starts and initializes the collector process that
receives the trace records. The trace procedure writes trace records to an extended data
segment in memory, and the collector eventually copies them to a disk file. You can use
the PTrace utility to format the trace file for easier interpretation (see the PTrace
Reference Manual). Figure B-1
shows the components of a trace.
Figure B-1. Tracing Overview
Management
Application
SCP
Tracing
Subsystem
Process
Object
Extended
Data
Segment
Collector
Process
PTRACE
Formatted
Listing
Trace
Request
Trace
Request
Traced
Activity
Trace
Records
Trace
Records
Trace
Records
Trace File
Start and Initialize Collector Process
VST060.vsd