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<p class="MsoPlainText">Hello Clement,</p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">Thank you for this very clear answer.</p>
<p class="MsoPlainText">How does Scilab Gateways work? When we tap enter after entering the command line on the prompt, let's say to call a primitive, does the gateway also need the API ?</p>
<p class="MsoPlainText">Or is there a more direct way to do so ?</p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">Regarding my questions on the libraries.</p>
<p class="MsoPlainText">Well, let's say I am a simple user of scilab, with no code development tools installed.</p>
<p class="MsoPlainText">Editing a c-block, seeing the #include math.h line was a bit scary, because I thought "this will require that I have put the math.h file at the good place on my computer".</p>
<p class="MsoPlainText">So I insert nothing in the code, click "ok" and the compilation is succesful. </p>
<p class="MsoPlainText">Now after running Scilab 2 c toolbox on my custom code, a number of subdirectories with multiple files were created in my custom directory. I suppose if I want this scilab 2 c created code running in the c-block, I have to put these files where the block can access them at compilation time.</p>
<p class="MsoPlainText">Same if I created the code on my own. That is why I asked where the c-block compiler looks to find the files, or how do we configure this, as users.</p>
<p class="MsoPlainText"> </p>
<p class="MsoPlainText">Best regards,</p>
<p class="MsoPlainText">Eric</p>
<p> </p>
<p> </p>
<p> </p>
<p> </p>
<blockquote style="padding-left: 5px; margin-left: 5px; border-left: #ff0000 2px solid;">> Message du 09/04/18 09:37<br />> De : "Clément David" <Clement.David@esi-group.com><br />> A : "dev@lists.scilab.org" <dev@lists.scilab.org><br />> Copie à : <br />> Objet : Re: [Scilab-Dev] New xcos blocks executing scilab primitive functions<br />> <br />> Hi Eric and welcome :)<br />> <br />> Nice to have some power users (and maybe futur developers) using big Xcos models, Xcos in 6.0.x have<br />> some issues only visible on big diagrams and we currently do not spend too much time benchmarking<br />> it.<br />> <br />> About the scifunc vs Superbloc vs C++ implementation speedup, the clear winner there would be C/C++<br />> if (and only if) there is no event management (either discrete or zero-crossing) to perform. Zero<br />> crossing detection is hard to implement even for small sub-systems and discrete events are only easy<br />> for synchronous subsystem. Superblocs are straightforward to implement and manage very complex<br />> events / continuous states intrication in a clean manner however they can be confusing to maintains<br />> (for exemple if you want to preserve the same behavior across different blocks). Scifunc are in-<br />> between to me in term of implementation however very poor in term of performance (and not optimized<br />> at all).<br />> <br />> You could use the scicos_block4 API (the default one) in C or C++ ; if you take a look at our source<br />> code there is only a few in C++ but they can be easily converted to. About the libraries, I did not<br />> get it, do you want to link to different libraries ? The xcos_toolbox_skeleton and ilib_for_build()<br />> flags are working well.<br />> <br />> To call Scilab script within the sciblk2 [1] and sciblk4 [2] blocks we are indeed using the Scilab<br />> C++ API, the performance overhead is quiet clear as we are currently allocating Scilab types::Double<br />> or a types::MList through createblklist() for each output on each simulation step. This does an<br />> extra allocation (for the Scilab datatype) and a copy (for the data copy to scilab) whereas in C/C++<br />> the data are passed by reference to the shared buffers. We clearly have to do better there ; maybe<br />> by allocating only once (at Initialization time) or passing types:: views to the shared buffers.<br />> There is a test case within xcos_toolbox_skeleton which switch the implementation of a NOOP block<br />> (that compute nothing) between Scilab and C depending on a parameter in Scilab.<br />> <br />> [1]: http://cgit.scilab.org/scilab/tree/scilab/modules/scicos/src/cpp/sciblk2.cpp#n57<br />> [2]: http://cgit.scilab.org/scilab/tree/scilab/modules/scicos/src/cpp/sciblk4.cpp#n217<br />> <br />> As a conclusion, yes you can call C++ functions from blocks and Scilab blocks issues comes from a<br />> slow implementation of C->Scilab calls not from the Scilab code interpretation.<br />> <br />> NB: yes this a known problem and some users already reports that but no one is currently working on<br />> that.<br />> <br />> Thanks,<br />> <br />> --<br />> Clément<br />> <br />> Le vendredi 06 avril 2018 à 05:47 -0700, ericgernot a écrit :<br />> > Hi, <br />> > <br />> > I am new to scilab, and I am not a developper, but I fear I may become one<br />> > because of Scilab :-;<br />> > I am on windows 7 /64, and installed some recent versions.<br />> > <br />> > I created a physic model (chemical process with compositions, streams, etc.)<br />> > from a script and used xcos to solve it, only using Sci_func blocks calling<br />> > my functions (so that it is easily portable to other scilab versions). It<br />> > works as desired, so now I want to speed it up.<br />> > <br />> > After all the possible improvements from vectorization, I decided to convert<br />> > 30% of my scifunc into superblocks, giving a 30% speedup boost to the model.<br />> > I could have written these in c/c++ also, but I suspect it would have taken<br />> > longer (for me)<br />> > <br />> > My remaining scifunc blocks are using some scilab gateways such as fsolve,<br />> > diag, etc, thus the conversion is not as straighforward. <br />> > <br />> > I tried to convert it in c using the scilab 2 c toolbox, this is great for<br />> > all operations exept scilab gateways.<br />> > <br />> > I had a look at how to create a new block, how the c-block work, and finally<br />> > how existing blocks are coded in c++.<br />> > <br />> > If I understand well, the possibilities are<br />> > 1. copy the c++ primitive function code in a c-block, it will not work<br />> > because it is not c, and because I don't know which libraries should be<br />> > included. By the way, where can I put them so that the compiler finds them ?<br />> > 2. use scilab API from a xcos c-block and send jobs. Will it really skip the<br />> > interpreter ?<br />> > 3. create a new block as a user (from within scilab). But you can't use c++<br />> > can you ? So I have to write or find c equivalent of scilab primitives, this<br />> > is a pity !<br />> > 4. create a new block source code, and compile a new version of scilab with<br />> > the new block. I suppose that the same problem exists: converting to c<br />> > scilab primitives ?<br />> > <br />> > So this raised a few questions:<br />> > - In the block source code, why not call scilab built in functions in c/c++<br />> > (not the gateway), only passing them the block arguments / parameters,<br />> > instead of pasting the code there. That would ease the creation of new<br />> > blocks isn't it ?<br />> > - can users call these built in functions in their custom blocks (e.g.<br />> > c-block) ? (I mean without invoking the parser etc., without linking already<br />> > linked libraries, etc.)<br />> > <br />> > I suppose that many users ran through these problems.<br />> > Thank you very mucn<br />> > Regards, <br />> > Eric<br />> > <br />> > <br />> > <br />> > <br />> > --<br />> > Sent from: http://mailinglists.scilab.org/Scilab-developers-Mailing-Lists-Archives-f2574944.html<br />> > _______________________________________________<br />> > dev mailing list<br />> > dev@lists.scilab.org<br />> > http://lists.scilab.org/mailman/listinfo/dev _______________________________________________ dev mailing list dev@lists.scilab.org http://lists.scilab.org/mailman/listinfo/dev </blockquote>