On 29 May 2008, at 00:57, janylj wrote:
I had a single broker, which uses the default configuration. Then I
had a
Producer sending messages to a queue and a Consumer reading from the
queue.
At this time, the CPU usage on the broker is about 60%-70%. Because
the
broker is on a box with 2 Xeon processes each @ 1.86GHz, each
processor has
more than 50% idle. Then I added another Producer and Consumer to
the queue,
it drove the combined CPU usage over 100% and each processor only
had 30%
idle. I think mostly Producer is taking CPU resource, adding more
Consumer
doesn't seem to put much CPU load.
Finally the message rate for one producer is about 4K message/
second. While
the rate when having three producers simultaneously only is 1.5K
message/second each.
The question is that whether it's expected from Activemq or
something I did
wrong. Also does it imply that adding more producer does not increase
throughput, if not decrease it?
Thank you very much.
--
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Sent from the ActiveMQ - User mailing list archive at Nabble.com.
There is a lot of work going on in the broker marshaling/unmarshaling
messages, adding them to an index in store etc - you will hit a
plateau where you won't increase overall throughput by adding more
producers. From your example, the overall throughput has increased
from 4k msg/sec to 4.5k msg/sec by using 3 producers instead of 1 - so
you haven't quite reached that point yet - but your close.
We will be looking at increasing throughput and reducing cpu for
version 6.0 - which will be due out later this year.
cheers,
Rob
http://open.iona.com/products/enterprise-activemq
http://rajdavies.blogspot.com/
