Thanks
>
> Edgar
>
> -Original Message-
> From: users On Behalf Of Gilles
> Gouaillardet via users
> Sent: Thursday, December 3, 2020 4:46 AM
> To: Open MPI Users
> Cc: Gilles Gouaillardet
> Subject: Re: [OMPI users] Parallel HDF5 low performance
>
>
: [OMPI users] Parallel HDF5 low performance
Patrick,
glad to hear you will upgrade Open MPI thanks to this workaround!
ompio has known performance issues on Lustre (this is why ROMIO is still the
default on this filesystem) but I do not remember such performance issues have
been reported on a
Patrick,
glad to hear you will upgrade Open MPI thanks to this workaround!
ompio has known performance issues on Lustre (this is why ROMIO is
still the default on this filesystem)
but I do not remember such performance issues have been reported on a
NFS filesystem.
Sharing a reproducer will be v
Thanks Gilles,
this is the solution.
I will set OMPI_MCA_io=^ompio automatically when loading the parallel
hdf5 module on the cluster.
I was tracking this problem for several weeks but not looking in the
right direction (testing NFS server I/O, network bandwidth.)
I think we will now move de
Patrick,
In recent Open MPI releases, the default component for MPI-IO is ompio
(and no more romio)
unless the file is on a Lustre filesystem.
You can force romio with
mpirun --mca io ^ompio ...
Cheers,
Gilles
On 12/3/2020 4:20 PM, Patrick Bégou via users wrote:
Hi,
I'm using an old
