On Monday morning I started migrating a set of applications over to using a JBM 
topic for sending and receiving messages, this was previously done by ActiveMQ. 
I thought I would share the results of monitoring the JBM server over this time 
period. I realise you guys haven't done much work on the memory and cpu usage 
aspects of JBM yet, but this at least proves that there is definitely a case 
for some work to be put into this area. We have a graph of memory usage on the 
server for the last week here:

http://massdosage.co.za/temp/jbm-perf1/jbm-memory-first_2days.png

and CPU on the same server for the same time period:

http://massdosage.co.za/temp/jbm-perf1/jbm-cpu-first_2days.png

On Monday we switched about 6 clients over to use JBM instead of AMQ. You 
notice a slight increase in memory and CPU compared with ActiveMQ up until that 
point. On Tuesday we then switched another 10 clients over, increasing the load 
from tens of messages a minute to hundreds (which is still not extreme). You 
can then see the memory go through the roof and the swap even gets called in 
(the purple, something we dread in terms of performance). The CPU also goes 
through the roof at around the same time. The sharp drop-offs on the right of 
the graphs are where I restarted the server today. The CPU shoots back up very 
quickly, the memory seems to be taking a bit longer. 

I will keep an eye on this, just thought I'd report it here so you can keep 
this in mind for the future. If there is any more information I can provide you 
with I'm more than happy to.



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