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[H5part] Re: H5Block and ghost zones

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  • From: Achim Gsell <achim.gsell AT>
  • To: Mark Howison <MHowison AT>
  • Cc: h5part AT
  • Subject: [H5part] Re: H5Block and ghost zones
  • Date: Fri, 9 Jul 2010 16:01:46 +0200
  • List-archive: <>
  • List-id: H5Part development and discussion <>

Hi Mark

On Jul 8, 2010, at 5:54 PM, Mark Howison wrote:

> I'm still working through the H5Block code, and I wanted to find out
> more about the original design decisions for handling arbitrary ghost
> zones, which introduces alot of complexity in "dissolving" them. I
> don't see an easy way to get around the O(n) space required in the
> H5Block file struct to store every proc's field layout for use in the
> ghost zone routines.

I implemented arbitrary ghost zone on request of LBNL ... But is the O(n)
space required really an issue? The layout occupies
6*sizeof(h5_int64_t)*nprocs bytes per process. With 64k cores it's just 3MB
(or 0.0022% of the available memory we have on Franklin/core).

> Do we need to support arbitrary ghost zones?

Good question, actually I don't know. As far as I know, we don't need them at


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