[Scilab-users] Scilab 6.1.0 - Benchmark time test terribly worrisome - ratio 20 with Scilab 6.1.0 and scilab 5.5.2 - bugzilla 16359
Perrichon
perrichon.pierre at wanadoo.fr
Wed Mar 4 11:05:05 CET 2020
Hello Clément,
As you requested, see bugzilla #16359
Best regards
Pierre P.
De : Clément David <Clement.David at esi-group.com>
Envoyé : lundi 2 mars 2020 12:25
À : Perrichon <perrichon.pierre at wanadoo.fr>; 'Users mailing list for Scilab'
<users at lists.scilab.org>
Cc : Clément David <Clement.David at esi-group.com>
Objet : RE: [Scilab-users] Xcos 6.1.0 - benchmark time test
Hello Pierre,
Thanks for the numbers, I will try to describe what can be down to work
around the time to results.
>From when you start the simulation to the first scope popup, the schema is
converted to a list of functions to be called in a specific order and passed
to a solver that will iterate on time to run the simulation. There might
be a difference between Scilab 5 and Scilab 6 as this transformation is
written using the Scilab language. It is the 5s to 95s ratio.
While the simulation is running, each blocks simulation function is called
a number of times. The solver/simulator/function API did not change between
Scilab 5 and Scilab 6, this should perform the same way. However, some
functions, especially sciblk2 and sciblk4 are wrappers from C to Scilab
functions and have been re-written to behave very differently. It is the
253s (258-5) to 4258s (4353-95) ratio (lower ratio but much more impact).
Could you please file a bug with some representative example (same number of
blocks, similar Scilab function) for further investigation ?
Note: having costly sciblk2 and sciblk4 also highly depends on your
schema, for example having them on a continuous loop will make the solver
call them on each timestep.
Regards,
--
Clément
From: Perrichon <perrichon.pierre at wanadoo.fr
<mailto:perrichon.pierre at wanadoo.fr> >
Sent: Monday, March 2, 2020 11:09 AM
To: 'Users mailing list for Scilab' <users at lists.scilab.org
<mailto:users at lists.scilab.org> >; Clément David
<Clement.David at esi-group.com <mailto:Clement.David at esi-group.com> >
Subject: RE: [Scilab-users] Xcos 6.1.0 - benchmark time test
Hello Clément,
Yes, I have some function blocks and expression blocks.
Must I understand that I have to write CBLOCK for scilab function or scilab
expression or both ?
Here are other results for a more complex project name PELT1
Time request : 100 s
Results :
Xcos Scilab 5.5.2 :
Durée de la simulation : 258.3 s
Xcos Sciab 6.1.0 :
Durée de la simulation : 4353.4 s
So the ratio is 16.8 for PELT1
Other information :
Scilab 5.5.2 : time between click go and first scope on the screen = 5 s
Scilab 6.1.0 : time between click go and first scope on the screen = 95 s
Ratio=19
and I also have other projects more complex
Pelt1 is for 1 needle (2 positonning loop)
Perlt6 for 6 !!! (7 positonning loop)
BR
De : users <users-bounces at lists.scilab.org
<mailto:users-bounces at lists.scilab.org> > De la part de Clément David
Envoyé : vendredi 28 février 2020 10:10
À : Users mailing list for Scilab <users at lists.scilab.org
<mailto:users at lists.scilab.org> >
Objet : Re: [Scilab-users] Xcos 6.1.0 - benchmark time test
Hello Pierre,
Are you using a block with its simulation function implemented in Scilab?
Any C/C++ implemented block might perform the same at simulation time.
In 6.0.2, implementing Xcos blocks using the Scilab language had some
performance issues. In 6.1.0, I tried to speed up things a little bit by
reusing some allocated data structure during simulation time [1] ; more work
might still be needed here.
[1]:
http://cgit.scilab.org/scilab/commit/?id=bfe4f25275dc0d889817d10b63e10c9a064
1ef32
Regards,
--
Clément
From: users <users-bounces at lists.scilab.org
<mailto:users-bounces at lists.scilab.org> > On Behalf Of Perrichon
Sent: Friday, February 28, 2020 8:51 AM
To: 'Users mailing list for Scilab' <users at lists.scilab.org
<mailto:users at lists.scilab.org> >
Subject: [Scilab-users] Xcos 6.1.0 - benchmark time test
Hello,
Here I test a PELTON basic algorithm under xcos, and record with tic-toc the
simulation real time.
These programs have been set for 120 s (scope)
Results :
Xcos Scilab 5.5.2 :
Durée de la simulation : 45.4 s
Xcos Sciab 6.1.0 :
Durée de la simulation : 65.2 s
So the ratio is 1.44 for a basic sheme
Any explaination ?
Can that be improved ?
BR
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