[gecode-users] Parallel search

[mehdi m]

I looked for the task manager and i found that just one core is used. Do i need to add something else to the code ?
Thanks.


Subject: Re: [gecode-users] Parallel search
From: gtack at odiug.de
Date: Mon, 16 Mar 2015 08:44:27 +1100
CC: users at gecode.org
To: medistif at hotmail.fr

Have a look at the Windows task manager, can you see if your model.exe is actually making use of all four cores?  If yes, it is possible that it's just a peculiarity of your model, i.e., that it simply doesn't parallelise well.  You can try different search strategies, that can sometimes make a difference for parallelisation as well.
Cheers,Guido

On 16 Mar 2015, at 2:28 am, mehdi m <medistif at hotmail.fr> wrote:


Hi everyone,
I'm trying to make the serach more efficient using several threads (Parallel seacrh) presented in section 9.2 in MPG.On my machine with four cores and employing gecode 4.0.0, i use the option :
model.exe  -threads 4
I'm using the serach engine BAB and calling branch (home, Var, INT_VAR_DEGREE_MAX(), INT_VAL_MAX() );
But it seems that it does not work, the runtime still the same without this option.
If you have some details about this, it will be helpful. 
Thanks 		 	   		  
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