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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">I’m not a guru but I’m pretty certain all modern JVMs support multiple cores well. You will probably make sure you are using the server VM (-server) and
not the client VM (assuming you are using the standard VM). Depending on what you current machine is and whether or not you have 2 cpu’s or just two cores (and if java can tell the difference) you may or may not currently be running the server vm (see
<a href="http://java.sun.com/javase/6/docs/technotes/guides/vm/server-class.html">
http://java.sun.com/javase/6/docs/technotes/guides/vm/server-class.html</a>) If you aren’t then you may be very lucky and find that switching to the server class vm gives you those few extra ms to keep your boss happy. Presumably you have also done the other
standard optimization tricks to ensure you have sufficient heap memory etc?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D">Thomas<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:
"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;
font-family:"Tahoma","sans-serif""> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Wolfgang Laun<br>
<b>Sent:</b> 11 May 2010 14:32<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> Re: [rules-users] Parallelization<o:p></o:p></span></p>
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<p class="MsoNormal">On Tue, May 11, 2010 at 2:55 PM, djb <<a href="mailto:dbrownell83@hotmail.com">dbrownell83@hotmail.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
Hi Wolfgang,<br>
<br>
I use one thread per StatefulKnowledgeSession... My machine has 2 cores, but<br>
it will eventually be running on an 8 core beast, so i reckon this was a<br>
good improvement. I was just worried that I wouldn't be able to<br>
simultaneously process multiple K-Sessions, but apparently, Drools doesn't<br>
mind. I'm pretty sure any machine with multiple cores supports parallel<br>
java threads, no?<o:p></o:p></p>
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<p class="MsoNormal">This is a Q for a Java guru (which I'm not), and may depend on the JVM and what not. Care<br>
to provide details? Probably there's people on this list who might know. (Otherwise,<br>
I have a good contact.)<br>
<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">-----<br>
Regarding my Utilities method, eg. isWithinTimePeriod("20100308",<br>
"20090405", 1, "Y")<br>
<br>
I can get about 5ms off by commenting out the eval, so it's not going to be<br>
a big jump even if I fix it, but, well, I am using yyyyMMdd Strings, which<br>
in the method, I sub-stringed, converted to ints, instantiated DateMidnight<br>
objects, and compared using Joda-time daysBetween/monthsBetween/yearsBetween<br>
methods.<o:p></o:p></p>
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<p class="MsoNormal">My thought was that pre-converting to ints would help, so that each<br>
ClaimLine has year/month/day int variables, and pass them in instead. (i.e.,<br>
Saves 3 String.substring()'s, and 3 Integer.parseInt()). but that actually<br>
slowed it down a few milliseconds. (Maybe passing 6 params instead of 2?!) <o:p></o:p></p>
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<p class="MsoNormal"><br>
You can treat 20100510 as an integer defining one date; all relations between<br>
such numbers would hold as for the "true" dates - you just can't compute<br>
durations (days between dates) by simple substraction.<br>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">I'm comparing two dates by an arbitrary period, like "2 days" or "1 month",<br>
and need the framework of the Gregorian Calendar. So, I don't think I can<br>
do anything about this. 2 months is never guaranteed to be a set number of<br>
milliseconds. It all depends on the claim date, which is fact data, and<br>
therefore variable.<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
I'm not sure how the other arguments in the call ("Y", 99) are related to rules<br>
or facts, but a repeated test whether one date dx is between d1 and d2 where<br>
d2 depends on d1 and a duration would certainly gain from computing d2<br>
once. <br>
<br>
-W<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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