2011/3/16 Yngve Inntjore Levinsen <[email protected]> > On Wednesday 16 March 2011 11:05:14 AM Francesc Alted wrote: > > For getting a good performance is very important your chunksize. > > Typical figures for serial I/O are between 32 KB and 1 MB, depending the > > final size of the dataset. Which one you are using? > > > > > > Thank you for your reply, > > I currently use a chunk size of 9x1024 floats, which by my calculations > would be 4.5 kB. You say I should still go up by a factor 10-100 in chunk > size then? >
9x1024 floats is something like 36 KB (single precision) or 72 KB (double precision). You can try several values up to 1 MB and select the one is giving you best performance. If the chunksize is a power of 2, it would be great, but it is not really necessary. HTH, -- Francesc Alted
_______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
