Hi,I return to the question because I still can't use the parallel search, i
used the same commandline options in the gecode example (chapter 3) as you
advice me. When i run the example "Golumb ruler" it works perfectly.
Here is what i'm using in my model :
/***/branch(*this, var, INT_VAR_DEGREE_MAX(), INT_VAL_MAX());/***/Options
opt("Solutions : \n");opt.solutions(0);opt.parse(argc,argv);
Model* m = new Model(opt);BAB<Model> bab(m);delete m; while
(Model* s = bab.next()) { s->print(); delete s;}/***/and i
run the model using the command : ./Model -threads 4
If you have some ideas, it will be very helpful.Thanks.------------
From: [email protected]
To: [email protected]; [email protected]; [email protected]
Subject: RE: [gecode-users] Parallel search
Date: Mon, 16 Mar 2015 10:29:25 +0100
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/~schulteProfessor of Computer Science, KTH,
[email protected] Researcher, SICS, [email protected] From:
[email protected] [mailto:[email protected]] On Behalf Of mehdi m
Sent: Monday, March 16, 2015 8:59 AM
To: Guido Tack; [email protected]
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: [email protected]
Date: Mon, 16 Mar 2015 08:44:27 +1100
CC: [email protected]
To: [email protected]
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
<[email protected]> 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.
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