[MPICH] striping_unit Hint Question

[Robert Latham]

On Thu, Feb 08, 2007 at 10:43:48PM -0600, Erich Peterson wrote:
> Hi, I'm very new to MPICH2 and had a question concerning the hint
> striping_unit. I'm wondering first does MPICH2 implement this hint
> and when will it follow the hint and when will it not. 

MPICH2 does implement striping_unit, but it has meaning only for
parallel file systems.  PVFS, for example, honors the hint, while NFS
does not.

> Lastly, if I create a file with this hint, if I then open and append
> or otherwise write to that file, will the new data inserted also be
> striped using the same number bytes as was given when the file was
> created?

I think for most parallel file systems the striping parameters are set
when the file is created.  

==rob

-- 
Rob Latham
Mathematics and Computer Science Division    A215 0178 EA2D B059 8CDF
Argonne National Lab, IL USA                 B29D F333 664A 4280 315B