[gecode-users] Parallel search

[Christian Schulte]

Well, if you want the commandline options to work, you will have to use a
setup as in the Gecode example (check Chapter 3 in MPG). If you do it
otherwise, read Section 9.3.1 in MPG.

 

Christian

 

--

Christian Schulte, www.gecode.org/~schulte

Professor of Computer Science, KTH,  <mailto:cschulte at kth.se>
cschulte at kth.se

Expert Researcher, SICS,  <mailto:cschulte at sics.se> cschulte at sics.se

 

From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of mehdi m
Sent: Monday, March 16, 2015 8:59 AM
To: Guido Tack; users at gecode.org
Subject: Re: [gecode-users] Parallel search

 

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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