[MPICH] striping_unit Hint Question

[Erich Peterson]

Thanks for the quick reply. I am using PVFS2, so that is good new. One last question, just to clarify: I am aware that the striping_unit hint is only premitted when the file is created. What I'm wondering is, if I create afile using the striping_unit hint, but then later I add to the file (add records to it), will the additional data be striped in the same manner as was the initial data was when it was created?
 
Thanks again,
Erich Peterson



> Date: Fri, 9 Feb 2007 10:11:34 -0600> To: erichpeterson at hotmail.com> CC: mpich-discuss at mcs.anl.gov> Subject: Re: [MPICH] striping_unit Hint Question> From: robl at mcs.anl.gov> > 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
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