About Geoffrey De Smet

Geoffrey De Smet (Red Hat) is the lead and founder of OptaPlanner. Before joining Red Hat in 2010, he was formerly employed as a Java consultant, an A.I. researcher and an enterprise application project lead. He has contributed to many open source projects (such as drools, jbpm, pressgang, spring-richclient, several maven plugins, weld, arquillian, ...). Since he started OptaPlanner in 2006, he’s been passionately addicted to planning optimization.

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Cheating on the N Queens benchmark

Many Solver distributions include an N Queens example, in which n queens need to be placed on a n*n sized chessboard, with no attack opportunities. So when you’re looking for the ...
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How much faster is Java 8?

Java SE 8 was released yesterday. Traditionally, every new major JRE version comes with a free performance boost. Do we get another free lunch? And how big is the gain this time? Let’s ...
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Can MapReduce solve planning problems?

To solve a planning or optimization problem, some solvers tend to scale out poorly: As the problem has more variables and more constraints, they use a lot more RAM memory and CPU power. ...
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Drools 6 Performance with the PHREAK Algorithm

Drools 6 introduces a new lazy matching algorithm. The details of that algorithm have been covered in two previous blogs:R.I.P. RETE time to get PHREAKY PHREAK Stack Based Evaluations ...
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Drools : PHREAK Stack Based Evaluations and Backward Chaining

A while back I wrote a blog on our new algorithm: http://blog.athico.com/2013/11/rip-rete-time-to-get-phreaky.html Someone asked me about the new stack based system, and how backward ...
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R.I.P. RETE time to get PHREAKY

I’ve just done some high level documentation for the new rule algorithm I’ve called PHREAK, a word play on Hybrid Reasoning. It’s still a bit rough and high level, ...
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KIE-WB / JBPM Console Ng – Configurations

Hi all, this is a follow up post from my previous entry about how to use the jBPM Console. The main idea of this post is to describe some of the most common configurations that you ...
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Goodbye Guvnor. Hello Drools Workbench.

Many things are changing for Drools 6.0. Along with the functional and feature changes we have restructured the Guvnor github repository to better reflect our new architecture. Guvnor ...
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Creating your own Drools and jBPM Persistence with Infinispan

Original post here by me: Hello and welcome to a post in which I intend to show you how to create your own implementation of drools and jBPM persistence. I’ve worked on an infinispan ...
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Score DRL: faster and easier in OptaPlanner

For OptaPlanner (= Drools Planner) 6.0.0.Beta1, I ‘ve replaced the ConstraintOccurrence with the much more elegant ConstraintMatch system. The result is that your score DRL files ...
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