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Re: [h5md-user] Dataset layouts

From: Peter Colberg
Subject: Re: [h5md-user] Dataset layouts
Date: Tue, 9 Jun 2015 16:41:46 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

Hi Pierre,

On Tue, Jun 09, 2015 at 10:30:31PM +0200, Pierre de Buyl wrote:
> I understand the motivation. Did you notice a difference in performance or is
> there some other motivation?

It is not related to performance at all.

Non-compact and compact datasets have to be handled differently for
writing and reading. A non-compact dataset is only written/read by one
process, while a compact dataset is written/read by all processes. 

When writing/reading a compact dataset from only one process, the
program will hang. When writing a non-compact dataset from all
processes, the program will block for a finite period due to
write conflicts.

The compact layout is preferable over the non-compact layout for
efficiency reasons (and being equivalent to attributes), hence I
propose to mandate the compact layout.


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