Multiple receiver Threads for a Queue

Question

We are currently running some performance tests on the Sun One Message Queue 3.5
I have implemented two clients running in their own VM which each sporns n threads.
client 1:
sporns n threads which each create it's own QueueSession to place one message on a queue. Each thread then waits for a reply message from client 2 threads.
client 2:
sporns n threads which each create it's own QueueSession to take one message off the queue and create a reply message.
The idea is to keep bouncing messages back and forth and to measure the performance of the producer-consumer cycle, whether it degrades over time etc.
It works fine if there is only 1 thread, as soon as I increment the number to 10 or 20, the consumers time out, even though there are messages on the queue.
I have made sure that each thread uses it's own Session, but is there something else that I've missed?
Thanks.

Answer 1

Did you get an exception ? Can you provide the
stacktrace ? What does the broker's log show ?
Please post the issue and necessary info to
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