[Scilab-users] scilab and "parallelization" objectives

[paul.carrico at free.fr]

Thanks claus 

I completely forgot this features (that I've ever tested but once only) 

The first trial "works" if I focus only on the results, but as one can
see on the screenshot, a part of the message appears in the console and
the second one in the terminal (why ????). 

The code is the following one for my very basic exemple (I used 2 CPU's
here because of my laptop features) 

Paul 

######################################################################################


mode(0)

function status=test(i, t)
    printf("function %d is launched with a pause of %g
second(s)\n",i,t);
    sleep(t*1000);
    printf("function %d is endeed\n\n",i);
    status = 0;
endfunction

// the duration is expressed in second(s)
//status = test(1,1);
//status = test(2,3);
//status = test(3,5);
//status = test(4,7);

number = [1 2]
duration = [1 3]
status = parallel_run(number,duration,"test")

Le 2016-10-22 10:26, Claus Futtrup a écrit : 

> Hi Paul
> 
> Have you/he/she looked into parallel_run() ?
> 
> Best regards,
> Claus
> 
> On 22-10-2016 09:33, paul.carrico at free.fr wrote:
> 
>> Hi All
>> 
>> Maybe my previous email was unclear, but the example hereafter
>> summarizes what I would like to do :
>> - here function is launched when the previous is finished
>> ("sequential way"),
>> - it is possible to launch them simultaneously?
>> 
>> _Nb_: I'm currently on Scilab 5.5.4 and maybe only the latest beta
>> release  allows this ?
>> 
>> If I can do this, then "bingo"
>> 
>> Thanks
>> 
>> Paul
>> ---------------------------------------------------------------
>> 
>> mode(0)
>> 
>> function status=test(i, t)
>> printf("function %d is launched\n",i);
>> sleep(t*1000);
>> printf("function %d is endeed\n\n",i);
>> status = 0;
>> endfunction
>> 
>> // the duration is expressed in second(s)
>> status = test(1,1);
>> status = test(2,3);
>> status = test(3,5);
>> status = test(4,7);
>> 
>> -------------------------
>> 
>> DE: "Paul Carrico" <paul.carrico at esterline.com>
>> À: "International users mailing list for Scilab.
>> (users at lists.scilab.org)" <users at lists.scilab.org>
>> ENVOYÉ: Jeudi 20 Octobre 2016 15:41:18
>> OBJET: [Scilab-users] scilab and "parallelization" objectives
>> 
>> Dear All,
>> 
>> My internship had an interesting request and I'm not able to
>> answer to him   JJ
>> 
>> The context is the following one:
>> 
>> -          We are using a parallel finite element solver on 4
>> PROCESSORS (under Linux),
>> 
>> -          We are performing optimization with an external
>> optimizer,
>> 
>> -          Scilab has been interfaced with both the optimizer and
>> the solver,
>> 
>> -          For the moment, the optimization loops are
>> "basically" performed using the parallelization capabilities of
>> the solvers.
>> 
>> In practice, Scilab "runs" the solver and "waits" the end of
>> the simulation (always using 4 processors) before calculating the
>> cost function value, giving the later value to the optimizer and
>> then closing.
>> 
>> IMAGINE THAT NOW we would like to run 4 DIFFERENT SIMULATIONS EACH
>> ON 1 PROCESSOR in order to determine the gain (CPU time) … how to
>> proceed ?
>> 
>> In practice Scilab must be able to :
>> 
>> -          Launch 1rst calculation and to handback …
>> 
>> -          … to launch the 2nd one … and so on
>> 
>> We can imagine creating a function per calculation (and I prefer in
>> order to mix stuffs), then running independently but at the same
>> time the different functions.
>> 
>> Honestly I've never done this before and I'm wondering how to
>> proceed … or if it is possible : any feedback on it ?
>> 
>> Thanks and regards
>> 
>> Paul
>> 
>> EXPORT CONTROL :
>> Cet email ne contient pas de données techniques
>> This email does not contain technical data
>> 
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