[dcmf] [PATCH 1/1] Issue 4362: Honor the romio_ds_write andromio_ds_read hints.

[Kamil Iskra]

Rajeev,

Out of curiosity, how does this work?  I mean, how does ROMIO figure out
that the file is on an NFS volume?

Kamil

On Sat, Feb 09, 2008 at 19:35:18 -0600, Rajeev Thakur wrote:

> ROMIO can be built for multiple file systems by configuring MPICH2 with
> --with-file-system=ufs+nfs (or whatever). Then, at runtime, locking will be
> used only for files that are on NFS.
>  
> Rajeev
> 
> > -----Original Message-----
> > From: dcmf-bounces at lists.anl-external.org 
> > [mailto:dcmf-bounces at lists.anl-external.org] On Behalf Of Rob Ross
> > Sent: Friday, February 08, 2008 8:40 PM
> > To: Bob Cernohous
> > Cc: dcmf
> > Subject: Re: [dcmf] [PATCH 1/1] Issue 4362: Honor the 
> > romio_ds_write andromio_ds_read hints.
> > 
> > My guess is that it's the "lowest common denominator", that 
> > it works for both GPFS (albeit with unnecessary locking 
> > calls) and for NFS, which are the two configurations for 
> > which IBM is interested.
> > 
> > Rob
> > 
> > On Feb 8, 2008, at 5:40 PM, Bob Cernohous wrote:
> > 
> > >
> > > robl at mcs.anl.gov (Robert Latham) wrote on 02/08/2008 04:22:17 PM:
> > >
> > > >
> > > > Do you know why ad_bgl is based off of ad_nfs and not ad_ufs?  The
> > > > aggressive locking in ad_nfs is an attempt to flush client-side
> > > > caches, but shouldn't be needed for other file systems.
> > >
> > > No, sorry.  I'm pretty new to romio.  I'll try to find some answers
> > > (and educate myself on  
> > > this)._______________________________________________
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> > 
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> > 
> 
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