[Scilab-users] scilab and "parallelization" objectives

[Arvid Rosén]

What OS are you running? parallel_run does not work on macOS. It does work on Linux though.

Cheers,
Arvid

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________________________________
From: users <users-bounces at lists.scilab.org> on behalf of Stéphane Mottelet <stephane.mottelet at utc.fr>
Sent: Saturday, October 22, 2016 4:33:22 PM
To: Users mailing list for Scilab
Subject: Re: [Scilab-users] scilab and "parallelization" objectives

Hello,

As parallel_run is using child Scilab processes, the std output of all children is the terminal where you started Scilab and not the Scilab console.

S.

Le 22 oct. 2016 à 15:11, paul.carrico at free.fr<mailto:paul.carrico at free.fr> a écrit :

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<mailto: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<mailto:paul.carrico at esterline.com>>
À: "International users mailing list for Scilab.
(users at lists.scilab.org<mailto:users at lists.scilab.org>)" <users at lists.scilab.org<mailto: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

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