[Octave-patch-tracker] [patch #8607] New module h5read to read/write HDF5 files

[Stefan Großhauser]

Follow-up Comment #9, patch #8607 (project octave):

% In its present form, reading certain large chunked datasets 
% consumes a tremendous amount of memory while it is as fast as 
% it should be if the dset is not chunked, or if the load() 
% function is used.
% This has to be fixed *quickly*, but I don't understand it yet, 
% I don't see much of a difference in what they both do.
%
% Maybe somebody else can confirm and/or comment?
%
pkg load hdf5oct;

%a = rand(230,40,40,70); % let's call that x)
a = rand(230,43,43,71);  % y)
s = size(a)
s(1)=1
h5create("testchunk.h5","/foo_chunked",size(a),'ChunkSize',s)
h5write("testchunk.h5","/foo_chunked",a)
h5create("testchunk.h5","/foo_unchunked",size(a))
h5write("testchunk.h5","/foo_unchunked",a)

disp("load:")
%str = load("-hdf5","testchunk.h5"); %okay for both x) and y)
%clear str;
disp("read unchunked:")
%b = h5read("testchunk.h5","/foo_unchunked"); %okay for both x) and y)
disp("read chunked:")
b = h5read("testchunk.h5","/foo_chunked"); %okay for x), catastrophic for y)


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