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From "mark yoffe" <mark.yo...@gmail.com>
Subject multiple listener ahsring a public queue
Date Thu, 20 Nov 2008 15:45:50 GMT

i have been running scenario where several consumers connect to the same
public queue (topic)
the consumers connect via subscription manager.

i have run several scenarios where multiple listeners use the same
connection (different sessions) and scenario where listeners each have their
own connection

all of this has been run on TRUNC versions

a while ago i started experiencing a serious down downgrade in performance
when using such a scenario

in the past the use of multiple listeners enabled me to enhance performance

but currently it appears that i can achieve a faster performance while using
1 listener application

in the past when several listeners used a shared queue - the message flow
to between the consumers was not even  (if using x listener one would expect
to receive 1/x messages per listener)
this problem/feature was corrected to support a pretty even distribution of
the task

as far as i can tell around the time this enhancement was made(it might not
be connected but..)

the performance started going down, and it is not a small difference

using one listener i can achieve a speed of X for 100k messages per second
using five listeners i experience a serious down grade of performance to ~5X
for 100k messages per second

this was not the case in the past and i am at a loss regarding this problem

does anyone know , how this can be resolved

Best Regards


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