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I/O impact on interprocess communication

To: nv-l@lists.tivoli.com
Subject: I/O impact on interprocess communication
From: Simon Long <slong@NETTRACK.COM.AU>
Date: Tue, 1 Jun 1999 09:21:00 +1100
Reply-to: Discussion of IBM NetView and POLYCENTER Manager on NetView <NV-L@UCSBVM.UCSB.EDU>
Sender: Discussion of IBM NetView and POLYCENTER Manager on NetView <NV-L@UCSBVM.UCSB.EDU>
Hi,

I have observed a problem with processes hanging ( ie. GUI halting, or GUI
unable to
shutdown - ie. just sitting there ) when a very high and sustained I/O
overhead is applied
to the system.

The platform: H50 running AIX 4.3.2
Framework : V3R6
Netview : V5R1

When I look at the "netstat -na" output at these times I see a slowly
incrementing send-q
figure for a certain Netview port ( but not listed in  the release notes
)..

Has anyone seen this sort of problem. If so - is there some tuning that can
be performed to
make the Netview GUI more resilient?

Also I can't remember the procedure for determining what is the owner of
the port - I know it's
part of Netview but I want to be able to describe the problem more clearly.

Regards,

Simon Long
Nettrack Technical Solutions Pty Ltd

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