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MarkPostma · Posted: Tue Nov 23, 2010 2:19 am Post subject:

On IBM website I read about a fix which might be of interest to us (see below). We currently have 5316. I read "use a UT MCA and set Blocking on". It's the set blocking on that puzzles me. Does anyone know what that means? Thanks!

IC65774: SLOW RESPONSE TIME WHEN USING MULTIHTREADED MCA'S AND SSL WITH WEBSPHERE MQ 5.3.1.4 FOR HP NSS OR LATER

Error descriptionWhen the message channel agent (MCA) is multithreaded and
the channel is configured to use SSL on a WMQ 5.3.1.5 for
HP NSS system, the result is very slow response time.
IP trace shows a request from the v5.3.1.5 queue manager
being sent to the remote queue manager within a few
milliseconds. The response is returned and delivered to
the MCA. However, it takes around 150-160 milliseconds
before the receiving WMQ application gets the response.
This delay was identified to be caused by code introduced
in WMQ 5.1.3.4 by APAR IC57744.
No delay is experienced when using ...
- WMQ for HP NSS versions prior to 5.3.1.4 +
Multithreading + SSL
- 5.3.1.4 or later + Unthread + SSL
- 5.3.1.4 or later + Multithreading without SSL

Local fix
Problem summaryA wait was introduced for a SSL read when data wasn't available
on the socket to ensure that the data was available when s
subsequent read is performed. This led to the degraded
performance.

Problem conclusionRemove the wait, performace returns to pre-5315 level.

Temporary fixIn 5315 use a UT MCA. In 5316 use a UT MCA and set Blocking on