Alright :-) Thanks for your answers. If I understand correctly, for instance when performing a strided read, ADIOI_GEN_ReadStridedColl is called, optimizes the access and then call ADIOI_BGL_ReadContig itself (possibly several times)? Btw how does Mpich knows which ADIO backend to use, in general? (and more specifically how does ADIOI_GEN_ReadStridedColl knows that it has to use ADIOI_BGL_ReadContig?) Does it have something to do with the fact that for instance with PVFS2 when the kernel module is not used, the filename should be prefixed by pvfs2:// ? If I want to develop a new ADIO backend, how can I make it such that filenames prefixed with myfilesystem:// will use this backend? (Maybe there's a documentation for that somewhere?) Thanks, Matthieu ----- Mail original -----

De: "Pavan Balaji" <[email protected]> À: [email protected] Cc: "Matthieu Dorier" <[email protected]> Envoyé: Mardi 30 Avril 2013 18:01:11 Objet: Re: [mpich-discuss] where is two-phase I/O implemented

Please don't call it mpich3; it's just "mpich" :-).

-- Pavan

On 04/30/2013 10:32 AM US Central Time, Matthieu Dorier wrote:

...

Hi,

A question more for the mpich3 developers:

If I were to implement an ADIO interface to a file system in mpich3, would I have to implement optimizations like two-phase I/O myself or are these optimizations implemented outside ADIO, independently of the file system?

Thanks,

Matthieu Dorier PhD student at ENS Cachan Brittany and IRISA http://people.irisa.fr/Matthieu.Dorier

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-- Pavan Balaji http://www.mcs.anl.gov/~balaji