[Scilab-users] Curing scf() & figure() slowliness: a good target for Scilab 6.0.1

[Clément David]

Hi Samuel,

This is clearly a regression : there probably some synchronization issue (CPUs are not busy at all),
could you report a bug on it please ?

--
Clément

Le samedi 25 février 2017 à 18:05 +0100, Samuel Gougeon a écrit :
> Hello,
> 
> Opening a new empty figure (without drawing anything) is a so common elementary task and it has
> become so long that i have built a short benchmark about it from Scilab 4.1.2 to Scilab 6.0.
> Detailed results are here-below. The main conclusions are the following:
> with no pre-existing figure, scf() is 20 times slower in 5.5 and 6.0 than in its best performances
> in 5.3.0. On my computer, it takes 0.062 s with 5.3.0 and 1.3 s now (5.5.2|6.0).
> Scilab 5.4.0, 5.4.1 and 5.5.0 have dramatically damaged performances.
> The loss is even 10x bigger with figure(): it is ~200 times slower with Scilab 5.5 & 6.0 than with
> Scilab 4.1.2
> 
> Since Scilab 5.5.0, the time taken to open a new figure increases linearly with the number of
> already opened figures. On my computer, opening the first one (after loading scf()) takes 1.8 s,
> and opening the 20th one takes almost 10 s. This is still the case with Scilab 6.0.
> Detailled results: 
> Opening the first figure :
> Only 2 tests are reported with figure() instead of scf().
> t=0; for i=1:50, tic(); scf(); t=t+toc(); xdel(); end; t, t/50
>                  [s]              [s]      4.1.2 base  figure()
> 6.0.0 : 62.39/50  1.248   18.5                 2.32
> 5.5.2 : 73.62/50  1.4723  21.8
> 5.5.0 : 69.94/50  1.3988  20.8
> 5.4.1 : 37.33/50  0.7466  11.1
> 5.4.0 : 24.07/50  0.4814  7.14
> 5.3.0 : 3.102/50  0.0620  0.92
> 5.1.0 : 4.069/50  0.0814  1.21
> 4.1.2 : 3.370/50  0.0674  1.00                0.014
> Opening 20 figures :
>  t=[]; for i=1:20, tic(); scf(); t(i)=toc(); end; sum(t)/20
> 
> 6.0.0 : 5.30 [1.35 => 9.51]
> 5.5.2 : 5.68 [1.77 => 9.92]
> 5.5.0 : 5.66 [1.82 => 9.85] range from the #1 to #20
> 5.4.1 : 1.18
> 5.4.0 : 0.923
> 5.3.0 : 0.110
> 5.1.0 : 
> 4.1.2 : 0.0774
> 
> 
> 
> Samuel
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