[rules-users] Parallelization
Steve Ronderos
steve.ronderos at ni.com
Tue May 11 09:46:32 EDT 2010
Hi Daniel,
I was reading the other day that a JVM implementation does not necessarily
have to run Java threads in different Processes (taking advantage of
multiple cores). If you saw a significant speedup then I would assume
your JVM does this. It is worth investigating for your production
deployment. I would think that recent JVMs on modern operating systems
would support this, but I also wouldn't leave it up to chance.
This post seems to imply that the only JVM/OS combinations that don't
support native threads are Java 1.2 or Solaris:
http://forums.sun.com/thread.jspa?threadID=5330507
About StatefulKnowledgeSessions: You should be able to run these in
parallel no problem.
-Steve
rules-users-bounces at lists.jboss.org wrote on 05/11/2010 07:55:18 AM:
> From:
>
> djb <dbrownell83 at hotmail.com>
>
> To:
>
> rules-users at lists.jboss.org
>
> Date:
>
> 05/11/2010 08:01 AM
>
> Subject:
>
> Re: [rules-users] Parallelization
>
> Sent by:
>
> rules-users-bounces at lists.jboss.org
>
>
> Hi Wolfgang,
>
> Ok, well I implemented my "option #2", which has cut it down to 23ms,
which
> is a good start. My timing is done by taking the time before, and
after,
> and dividing by the number of claims processed. (and averaging over a
few
> runs)
>
> I use one thread per StatefulKnowledgeSession... My machine has 2 cores,
but
> it will eventually be running on an 8 core beast, so i reckon this was a
> good improvement. I was just worried that I wouldn't be able to
> simultaneously process multiple K-Sessions, but apparently, Drools
doesn't
> mind. I'm pretty sure any machine with multiple cores supports parallel
> java threads, no?
>
>
>
> -----
> Regarding my Utilities method, eg. isWithinTimePeriod("20100308",
> "20090405", 1, "Y")
>
> I can get about 5ms off by commenting out the eval, so it's not going to
be
> a big jump even if I fix it, but, well, I am using yyyyMMdd Strings,
which
> in the method, I sub-stringed, converted to ints, instantiated
DateMidnight
> objects, and compared using Joda-time
daysBetween/monthsBetween/yearsBetween
> methods.
>
> My thought was that pre-converting to ints would help, so that each
> ClaimLine has year/month/day int variables, and pass them in instead.
(i.e.,
> Saves 3 String.substring()'s, and 3 Integer.parseInt()). but that
actually
> slowed it down a few milliseconds. (Maybe passing 6 params instead of
2?!)
>
> I'm comparing two dates by an arbitrary period, like "2 days" or "1
month",
> and need the framework of the Gregorian Calendar. So, I don't think I
can
> do anything about this. 2 months is never guaranteed to be a set number
of
> milliseconds. It all depends on the claim date, which is fact data, and
> therefore variable.
>
> Regards,
> Daniel
>
> --
> View this message in context: http://drools-java-rules-engine.
> 46999.n3.nabble.com/Parallelization-tp809341p809753.html
> Sent from the Drools - User mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20100511/900072d6/attachment.html
More information about the rules-users
mailing list