>From [email protected] Fri Jan 13 05:26:44 2012
>From: Balint Takacs <[email protected]>
>To: [email protected]
>
>Hi all,
>
>Does the set_cache function have any effect with contiguously stored
>datasets, or it works only for chunked ones?
>
>If the latter, can the same caching functionality achieved by
>set_sieve_buffer_size when using the default sec2 driver?
>
>I am planning to use a large cache, like 0.5GB.
>
>OS is Linux and the HDF version is 1.6.5. I know it is old, but I have no
>option to upgrade.
>
>Thank you for your answers!
>
>Balint
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>Hdf-forum is for HDF software users discussion.
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Hi Balint,
You question is a bit outside my area of expertise, but since
no one else has responded, I'll take a crack at it.
In 1.6.5, H5Pset_cache() allows you to configure the chunk
cache only (the metadata cache was redesigned and re-implemented in
1.6.4, and API calls to configure it were not added until 1.8).
While I haven't had occasion to work on the chunk cache code, it
is my understanding that the configuration of the chunk cache only
effects I/O for chunked data sets.
As to chunk cache size. While I am not sure exactly what
happens in 1.6.5, at least some version of HDF5 created a separate
chunk cache for each open data set. Thus if you use a large chunk
cache, you will want to watch your memory footprint if you open
multiple chunked data sets simultaneously.
I'm afraid I don't know enough about H5Pset_sieve_buffer_size()
to comment without digging into the code.
I hope this helps.
Best regards,
John Mainzer
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