[Scilab-users] scilab 6.1 crashes when trying to load big matfile (loadmatfile)

[Antoine Monmayrant]

Hello all,


Here is a small script that systematically crashes scilab on my machine:


////////////////////////////////

// on my machine with 8Gb or ram and usual workload, n=28 crashes scilab
n=[24,26,28];

for i=n

     disp('---- '+string(i)+' ----');
     execstr('a'+string(i)+'=[1:2^'+string(i)+'];')
     disp('a'+string(i)+'=[1:2^'+string(i)+'];')
execstr("savematfile(''a"+string(i)+".mat'',''a"+string(i)+"'');")
disp("savematfile(''a"+string(i)+".mat'',''a"+string(i)+"'');")
     execstr("loadmatfile(''a"+string(i)+".mat'');")
     disp("loadmatfile(''a"+string(i)+".mat'');")
     disp('---- OK ----');

end

////////////////////////////////

You'll have to adapt the maximum value for n depending on your available 
ram.

Antoine


On 18/06/2020 13:06, Stéphane Mottelet wrote:
> Hello Antoine,
>
> I made a 4Gb file with Matlab:
>
> >> a=rand(645,645,645);
> >> b=rand(645,645,645);
> >> c={a,b};
> >> save("c.mat","-7.3","c")
>
> and managed to load it successfully in Scilab:
>
> --> loadmatfile("c.mat");
>
> --> c
>  c  =
>
>   [645x645x645 constant]  [645x645x645 constant]
>
> Maybe the structure I tried is too simple (just two hypermatrices in a 
> cell) so please give us a representative failing example.
>
> S.
>
> Le 17/06/2020 à 13:22, Antoine Monmayrant a écrit :
>> Hello All,
>>
>> I cannot open large matfile in scilab (~3.4Gb).
>> Scilab is always dying with an error message that is extremely 
>> instructive: "Killed".
>>
>> It's a bit cumbersome to share this big fie, so do you have any idea 
>> on how to investigate this issue and try to locate the root cause?
>>
>> As a side note, it might be a problem related to either the size of 
>> the variables or their nature: cells containing hypermatrices.
>> The file itself is not corrupted (I managed to open it in matlab and 
>> to save each hypermatrix into individual files that got imported in 
>> scilab with no problem.
>>
>> Cheers,
>>
>> Antoine
>>
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>