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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">That looks great, presumably it makes little difference on the actual running times of the rules?<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">The thing I’d really like to be optimized is rule compilation and load time (particularly as it seems to be getting slower!), however I’ve a feeling that it
may not be as simple a thing to improve!<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>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> rules-dev-bounces@lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org]
<b>On Behalf Of </b>Mario Fusco<br>
<b>Sent:</b> 26 September 2011 09:44<br>
<b>To:</b> rules-dev@lists.jboss.org<br>
<b>Subject:</b> [rules-dev] Optimizing working memory<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi,<br>
<br>
as suggested by Mark, last Thursday I pushed some optimization to the working memory.<br>
<br>
<a href="https://github.com/droolsjbpm/drools/commit/763ebf8d23d5f9ab0a47774c23aa719f514ec021" target="_blank">https://github.com/droolsjbpm/drools/commit/763ebf8d23d5f9ab0a47774c23aa719f514ec021</a><br>
<br>
As you can see I basically lazy initialized all the non-strictly necessary data structures and rewrote the updateEntryPointsCache method. Now I also had time to benchmark these improvements in terms of both memory occupation and speed. I did this by just creating
a StatefulKnowledgeSession starting from a KnowledgeBase with a single simple rule.<br>
<br>
Before my optimization, each StatefulKnowledgeSession occupied 11,336 bytes and I can create (on my machine) 4,668 of them in one second.<br>
After it, each StatefulKnowledgeSession is now 8,610 bytes and in one second I can create 12,304 of them.<br>
<br>
I guess those results are truly positive and interesting especially if compared with the time (just a few hours) I needed to implement them.
<br>
Would be great If you think there are other parts of the project where it could be possible to achieve similar results and then you could signal them.<br>
<span style="color:#888888"><br>
Mario Fusco<br>
twitter: <a href="http://twitter.com/#!/mariofusco">http://twitter.com/#!/mariofusco</a></span><o:p></o:p></p>
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