Hi Eduardo,
On May 3, 2011, at 12:36 PM, Eduardo wrote:
>> Different chunk sizes would be interesting to avoid IO contention when
>> the hyperslabs are not regular.
>
> So, if my hyperslabs are not regular (similarly to my previous
> example), does my application suffer IO contention? I mean, should I
> avoid irregular hyperslabs, even if there is no overlap or gaps?
Yes, independent access I/O performance will be best when there is a
direct mapping of each process's selection to 1+ chunks and those chunks aren't
accessed by other processes. Enabling collective I/O access may reduce or
eliminate the penalty for accessing one chunk with multiple processes however.
Quincey
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