A Wednesday 22 September 2010 21:36:57 John Knutson escrigué: > I'm still trying to milk as much as I can, performance-wise, out of > HDF5... > > My latest bit of confusion comes from the following seeming paradox. > I have two files, poo2.h5 and poo3-d-1.h5. Both files contain > exactly the same data, though poo2, being the larger data set, has > more blank-filled elements. Also, because of the larger size of the > data set in poo2, the data starts at (0, 0, 694080) or thereabouts, > vs. (0,0,0) for poo3-d-1. My question is: "why is the smaller data > set 10x larger in size (bytes?) than the larger data set with the > same data and chunking?" [clip]
May be compression has something to do? poo2 has a 5e7 compression ratio, while poo3-d-1 has 5e2. While I can understand the latter figure, the former compression ratio (5e7) is a bit too high? Maybe poo2 is only made of zeros? -- Francesc Alted _______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
