Browse Prior Art Database

Workload-Dependent Automatically Adjusted Task Trace

IP.com Disclosure Number: IPCOM000120241D
Original Publication Date: 1991-Apr-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 76K

Publishing Venue

IBM

Related People

Kiel, HG: AUTHOR [+2]

Abstract

A work station controller (WSC) provides attachment of multiple work stations to a computer system. Certain WSCs support task trace to aid in problem debug. In general, task trace is not used during normal operation because of associated performance degradation. Performance degradation is caused by the extra load on the WSC processor copying tasks into a trace area and possibly WSC storage used for trace area instead of storage for servicing attached work stations. This article describes how task trace can be turned on automatically when WSC resources are available and turned off automatically when resources become stressed.

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This is the abbreviated version, containing approximately 52% of the total text.

Workload-Dependent Automatically Adjusted Task Trace

      A work station controller (WSC) provides attachment of
multiple work stations to a computer system.  Certain WSCs support
task trace to aid in problem debug.  In general, task trace is not
used during normal operation because of associated performance
degradation.  Performance degradation is caused by the extra load on
the WSC processor copying tasks into a trace area and possibly WSC
storage used for trace area instead of storage for servicing attached
work stations.  This article describes how task trace can be turned
on automatically when WSC resources are available and turned off
automatically when resources become stressed.

      Work stations can include dependent displays, programmable work
stations, and printers.  A typical local WSC with attached work
stations is shown in the figure. This article also applies to remote
WSCs which attach to the host processor via communication line
instead of system bus.

      Task trace may be turned on by the host processor during
problem debug.  The host will automatically retrieve a copy of WSC
storage whenever certain types of errors occur within the WSC or the
host can retrieve a copy of WSC storage at any time desired.  If WSC
task trace is on, task trace information is contained in the
retrieved data and can be used in problem debug.  When the host turns
on WSC task trace, task trace runs independent of WSC resource
availability.  Task trace which is turned on and off automatically
based on WSC resource availability, as described in this article,
stores the same history of WSC tasks as host-specified task trace.

      For example,...