Hello,
I tried your code in 5.5.1 and the last nightly-build of 6.0: I see a
slowdown of around 175 between old save in 5.5.1 and new (and only) save
in 6.0.
It's really related to the data structure, because we use hdf5
read/write a lot here and did not experience significant slowdowns using
6.0.
I think the overhead might come to the translation of your fairly
complex variable (a long array of tlist) in the corresponding hdf5
structure.
In the old save, this translation was not necessary.
Maybe you could try to save your data in a different way.
For example:
3) you could save each element of "filters" in a separate file.
2) you could bypass save and directly write your data in a hdf5 file by
using h5open(), h5write() directly. It means you need to write your own
load() for your custom file format. But this way, you can try to find
the best way to layout your data in hdf5 format.
3) in addition to 2) you could try to save each entry of your "filters"
array as one dataset in a given hdf5 file.
Did you search on bugzilla whether this bug was already submitted?
Could you try to report it?
Antoine
Le 15/10/2018 à 10:11, Arvid Rosén a écrit :
/////////////////////////////////
N = 4;
n = 10000;
filters = list();
for i=1:n
G=syslin('c', rand(N,N), rand(N,1), rand(1,N), rand(1,1));
filters($+1) = G;
end
tic();
save('filters.dat', filters);
ts1 = toc();
tic();
save('filters.dat', 'filters');
ts2 = toc();
printf("old save %.2fs\n", ts1);
printf("new save %.2fs\n", ts2);
printf("slowdown %.1f\n", ts2/ts1);
/////////////////////////////////
--
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Antoine Monmayrant LAAS - CNRS
7 avenue du Colonel Roche
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Tel:+33 5 61 33 64 59
email : [email protected]
permanent email : [email protected]
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