[rules-users] Add/remove objects from working memory are very CPU intensive

[Einat Idan]

Hi,

I encountered a serious performance problem using Jboss Rules 3.0.1. The
process was executed on a pretty strong machine - a DL350 4 cpu RedHat
machine. The process was using about 100% CPU and I used a profiler to see
what's going on:

My application adds/removes objects to/from the working memory of a stateful
rule session quite intensively (2000-3000 per sec), though the intensive
actions were related to a single rule session and only a few extra rule
sessions existed simultaneously. It turned out that about 7-10% of CPU was
consumed per a single add/remove operation. More specifically,
ReteooWorkingMemory.doRetract() and ReteooWorkingMemory.doAssertObject()
were the major consumers. I would expect a basic operation like this to be
significantly less CPU intensive.

Would you please provide more information, is my benchmark too ambitious? Do
you recommend an upgrade to version 3.0.6? 3.1? If so, please elaborate what
were the performance improvements.

Best regards,
Einat Idan
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