[Pvfs2-users] Re: [OMPI users] Problem with NFS + PVFS2 + OpenMPI

Davi Vercillo C. Garcia davivercillo at gmail.com
Thu May 29 15:48:49 EDT 2008


> Oh, I see you want to use ordered i/o in your application.  PVFS
> doesn't support that mode.  However, since you know how much data each
> process wants to write, a combination of MPI_Scan (to compute each
> processes offset) and MPI_File_write_at_all (to carry out the
> collective i/o) will give you the same result with likely better
> performance (and has the nice side effect of working with pvfs).

I don't understand very well this... what do I need to change in my code ?

Davi Vercillo Carneiro Garcia

Universidade Federal do Rio de Janeiro
Departamento de Ciência da Computação
DCC-IM/UFRJ - http://www.dcc.ufrj.br

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