January 2006


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Sean Luke <[log in to unmask]>
Reply To:
ECJ Evolutionary Computation Toolkit <[log in to unmask]>
Sun, 29 Jan 2006 14:16:20 -0500
text/plain (58 lines)
What Liviu means by this is that in your version of the evaluator,  
all slaves' random number generators are hard-coded seeded with a  
seed based on the wall clock time.  ECJ will make sure the seeds are  
different from one another.  There is no option to do anything else  
in the new master-slave evaluator.


On Jan 29, 2006, at 2:43 AM, I Jonyer wrote:

> I see, thanks.
> Where do you get N and where do you set it? Can I set it to 'time'?
> Istvan
>> From: Liviu Panait <[log in to unmask]>
>> Reply-To: ECJ Evolutionary Computation Toolkit              <ECJ- 
>> [log in to unmask]>
>> To: [log in to unmask]
>> Subject: Re: ECJ14 beta
>> Date: Sun, 29 Jan 2006 02:22:28 -0500
>> Istvan,
>> evalthreads does not have any impact on the new master-slave   
>> evaluator.  We support it in the new master-slave just for   
>> compatibility with the other evaluators.  If I were to use the   
>> system, I'd set evalthreads=1
>> As evaluators may come online and crash at any point in time,  
>> their  random seeds are usually set as N+K, where N is a fixed  
>> number, and K  is the number of slaves that have connected up to  
>> now to the master.
>> Best regards,
>> Liviu.
>> On Jan 28, 2006, at 11:17 PM, I Jonyer wrote:
>>> Liviu (or Sean),
>>> I have been testing the distributed functionality in ECJ14 beta.  
>>> I  have been playing with the number of evaluation threads and  
>>> the  actual number of clients I am starting up. The number of  
>>> evaluation  threads does not seem to have any effect. The master  
>>> always accepts  all the clients that want to register, never  
>>> refusing any of them  or waiting for more. I like this the way it  
>>> is, but I am wondering  what, if any, role evalthreads plays in  
>>> this version.
>>> Also, if I have 10 evalthreads specified, but 20 clients   
>>> registering, what is the default value of the random seed for  
>>> those  clients which were never specified?
>>> Thank you,
>>> Istvan