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Dynamically Adjusted Host Polling Interval

IP.com Disclosure Number: IPCOM000122337D
Original Publication Date: 1991-Nov-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 74K

Publishing Venue

IBM

Related People

Henderson Jr, JG: AUTHOR

Abstract

When a user of a local workstation is monitoring a remote host's status information in a client/server configuration, he would ideally like to see a state change immediately. If the work station must poll the host for the information, frequent polling would be required for quick notification. However, frequent polling may or may not be practical for the following reasons: - Work Station Lock Up: Functionally of the polling device may be limited while the poll is outstanding. - Communication Line Speed: Connection through a high speed LAN will allow for frequent updates, a slow ASYNC line does not. - Data Volume: Small amounts of transferred status information allows for frequent updates, large amounts do not. - Host Response Time: A fast unloaded host can process frequent update requests, a slow congested host cannot.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 53% of the total text.

Dynamically Adjusted Host Polling Interval

      When a user of a local workstation is monitoring a remote
host's status information in a client/server configuration, he would
ideally like to see a state change immediately.  If the work station
must poll the host for the information, frequent polling would be
required for quick notification. However, frequent polling may or may
not be practical for the following reasons:
-  Work Station Lock Up: Functionally of the polling device may be
limited while the poll is outstanding.
-  Communication Line Speed:  Connection through a high speed LAN
will allow for frequent updates, a slow ASYNC line does not.
-  Data Volume:  Small amounts of transferred status information
allows for frequent updates, large amounts do not.
-  Host Response Time:  A fast unloaded host can process frequent
update requests, a slow congested host cannot.

      All of these conditions may change on a dynamic basis. Ideally,
then the host polling interval will be adjusted dynamically.

      A normal polling interval (NPI) will be defined (for example,
30 seconds), and an expected request response time (ERT) will be
defined (3 seconds).  If the actual request response time (ART) is
longer than the expected, the actual polling interval (API) should be
increased.  If the response time is faster than expected, the system
will allow for more frequent updates and the polling interval can be
decreased.

      The actual response time i...