April 2006


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Liviu Panait <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Fri, 21 Apr 2006 12:24:47 -0400
text/plain (61 lines)
Dear Istvan,

> Is there any way to kill all the slave processes after the master  
> goes down? I modified the previous version so that the slaves would  
> exit, but after upgrading I forgot to do this, and now I have  
> slaves running on my entire cluster and they would not exit. Any  
> way that I would not have to log into all nodes and kill them all  
> one-by-one?
Of course there is a way, you can always write a script.... ;-)

On a more serious note, which version are you using?  I tried version  
15, and the slaves seem to exit when the master shuts down.  The way  
this is implemented is that all slaves are sent a V_SHUTDOWN message  
when the master is about to exit.  When the slaves receive this  
message, they close their sockets, and then they exit (this is  
implemented via a return call from the main function).  Is it  
possible that the return call is commented out in your version for  
some reason?

Best regards,


> From:  Sean Luke <[log in to unmask]>
> Reply-To:  ECJ Evolutionary Computation Toolkit <ECJ-INTEREST- 
> [log in to unmask]>
> To:  [log in to unmask]
> Subject:  ECJ 14/15 and MASON 11 released
> Date:  Tue, 4 Apr 2006 01:10:38 -0400
> >The George Mason University Evolutionary Computation Laboratory and
> >Center for Social Complexity announce a new release of the ECJ
> >evolutionary computation library and MASON multiagent simulation
> >toolkit.  Both systems have seen major improvements and revisions
> >since the last release approximately eight months ago.  The two
> >systems are also being re-licensed under the Academic Free License
> >version 3.0.
> >
> >ECJ is being released in two versions: a backward-compatable version
> >  (14) and a non-backward-compatible version (15) with significant
> >framework revisions.  The dual release will (hopefully) give people
> >some extra time to convert to the new version.  ECJ 14/15 also has
> >numerous bug-fixes, speed improvements, and a new package (spatial
> >embedding).
> >
> >ECJ can be found here:
> >
> >
> >ECJ CVS access is also available at SourceForge, but
> >  has experienced a major hardware failure this past week and CVS
> >access is not expected for several days at the earliest.
> >
> >
> >MASON 11 is a major revision of our multiagent simulator.  It sports
> >  a new charting and tracking facility, several new problem domains,
> >  and a very large number of bug fixes and improvements.
> >
> >MASON can be found here:
> >
> >
> >Sean Luke