i would like to get that patch very much if you can please send me the patch and point me where i can use it
thank you very much Best Regrds Mark On Thu, Nov 20, 2008 at 6:43 PM, Gordon Sim <[EMAIL PROTECTED]> wrote: > mark yoffe wrote: > >> Hi >> >> >> 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 >> > > Sounds like https://issues.apache.org/jira/browse/QPID-1280 for which I > don't have a quick fix unfortunately as yet. It was caused by some necessary > changes to the locking (specifically to prevent deadlocks when using RDMA, > but this may also have improved the 'fairness' of allocation). > > I can give you a one-line patch that should revert back to the earlier > performance if you like. I have some ideas for a proper fix but they were > going to be too involved for the M4 timeframe I'm afraid. > > Adding more publishers also helps I found. >
