[Scilab-users] ?==?utf-8?q? Scilab 6.1 too slow to list large vectors

[Antoine Monmayrant]

Hello,

I also ran some tests and it seems that the regression is clearly line-based: ie the regression is worse for vector than for matrix because there more lines to print to display a vector than a matrix of similar length.
See my test code below.


n1=300;
n2=100;
mat=rand(n1,n2);
tn=[];

/* Ctrl+E the code below several times*/

tic
mat // matrix
//mat(:) // vector
t=toc()
tn=[tn,t];

disp('---------')
disp('N_run = '+string(length(tn)))
disp('T='+string(mean(tn))+'+/-'+string(stdev(tn)));


/*
6.0.2 matrix
N_run = 20
T=0.6392742+/-0.056698
1.6x slower  but plotting 4 values per line ie 4x less lines to plot than for the matrix version

6.1.0 matrix
N_run = 10
T=1.0335109+/-0.0317414

6.0.2 vector mat(:)
N_run = 20
T=0.4943449+/-0.0662727

6.1.0 vector mat(:)
N_run = 10
T=3.800698+/-0.1121251
7.7x slower ie same slow down per line than for the vector version as we plot 4 values per line so 4x more lines

*/
 
 
 
Le Mardi, Mars 31, 2020 11:36 CEST, Federico Miyara <fmiyara at fceia.unr.edu.ar> a écrit: 
 
> 
> Stéphane,
> 
> I simplified and diversified the test:
> 
> tic
> u = rand(100,1000)
> toc
> 
> takes
> 16 s in 6.1
> 10 s in 6.0.2
> 
> tic
> u = u(:)'
> toc
> 
> takes
> 66 s in 6.1
> 1.29 s in 6.0.2
> 
> tic
> u = u(:)
> toc
> 
> takes
> 107 s in 6.1
> 1.52 s in 6.0.2
> 
> tic
> u = matrix(u,1000,100)
> toc
> 
> takes
> 16 s in 6.1
> 10 s in 6.0.2
> 
> tic
> u = matrix(u,100, 100, 10)
> toc
> 
> takes
> 0.5 s in 6.1
> 0.5 s in 6.0.2
> 
> Seems as if vertical (many line feeds) print took more time than 
> horizontal print.
> 
> Regards,
> 
> Federico Miyara
> 
> 
> 
> On 31/03/2020 05:23, Stéphane Mottelet wrote:
> >
> > Hi Frederico,
> >
> > Thanks for reporting. Can you test if the regression also holds for 
> > matrices ?
> >
> > S.
> >
> > Le 30/03/2020 à 11:56, Federico Miyara a écrit :
> >>
> >> Fs  =  44100
> >> T  =  2.5
> >> t  =  [0:T*Fs]/Fs;
> >> ximp  =  exp(-t/0.3).*rand(t,"normal")  +  0.004*rand(t,"normal");
> >>
> >> tic
> >> ximp  =  ximp(:)
> >> toc
> > -- 
> > Stéphane Mottelet
> > Ingénieur de recherche
> > EA 4297 Transformations Intégrées de la Matière Renouvelable
> > Département Génie des Procédés Industriels
> > Sorbonne Universités - Université de Technologie de Compiègne
> > CS 60319, 60203 Compiègne cedex
> > Tel : +33(0)344234688
> > http://www.utc.fr/~mottelet
> >
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>