A Monday 21 December 2009 13:27:36 Francesc Alted escrigué:
> Hi,
>
> I'm interested in being able to change the cache settings for chunks in
> HDF5. For this, I plan to call:
>
> {{{
> herr_t H5Pset_cache(hid_t plist_id, int mdc_nelmts, size_t rdcc_nelmts,
> size_t rdcc_nbytes, double rdcc_w0)
> }}}
>
> before opening an HDF5 file.
>
> Most of the parameters of the H5Pset_cache call are clear, but I cannot
> determine a good default for rdcc_nelemts. From the manual:
>
> {{{
> The number of elements (objects) in the raw data chunk cache is
> rdcc_nelmts. The total size of the raw data chunk cache and the preemption
> policy are rdcc_nbytes and rdcc_w0, respectively.
> }}}
>
> I'm choosing 10 by default at this time, but I'd be grateful if anybody can
> tell me whether this is a decent value or not (and the rational behind
> this).
Ok. After considering this for a while, I'll stick with a value of 256 as the
default for rdcc_nelmts. I hope it would not be too much --although, frankly,
the rdcc_nbytes will force a more lower number generally speaking.
Cheers,
--
Francesc Alted
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