June 2013


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Warren Henning <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Wed, 19 Jun 2013 02:27:01 -0700
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Did you set up ECJ to use the number of cores you expect?

Specifically what did you do to set this up? Which configuration setting
and precisely what did you give it?

On Wed, Jun 19, 2013 at 2:13 AM, Bojan Janisch <
[log in to unmask]> wrote:

> Hello everyone,
> I'm using ECJ for rule-creation and -evaluation. Recently I can use ECJ on
> 20 cores
> of a server which runs very fast at the beginning. But after a while the
> CPU-usage
> goes down to 1 core which I don't understand.
> The evaluation process looks so:
> Step 1: Create a valid rule from GPTree
> Step 2: If rule contains nothing useful skip everything else, set bad
> score and go to Step 6
> Step 3: Rule contains something useful, so load the testdata
> Step 4: Run the rule through Drools and testdata (Drools is a ruleengine
> which also runs multithreaded)
> Step 5: Compare the output of Drools and a goldstandard (the goldstandard
> and some more information are one time loaded at setup)
> Step 6: Put the score, returned by the comparison, into the koza fitness
> I don't know why but after some time, ECJ is only using 1 core.
> Does someone got an idea where the problem could come from?
> Greetings
> Bojan