PnetCDF error on cluster

[Wei-keng Liao]

Hi,

Using NFS is discouraged for MPI-IO (and PnetCDF as well) applications, because
it requires a special setting in NFS lock daemons to make it work correctly
for MPI-IO.
See ROMIO user guide at ftp://ftp.mcs.anl.gov/pub/romio/users-guide/node12.html <ftp://ftp.mcs.anl.gov/pub/romio/users-guide/node12.html>

If the HPC cluster you are using has a parallel file system, such as Lustre or
OrangeFS, then you should use it.

Wei-keng

> On Apr 16, 2018, at 3:07 AM, o_Orz <x70062924 at qq.com> wrote:
> 
> Hi:
>     I runned WRF program on ARM HPC cluster. In the cluster, all nodes share working directory by NFS.
>     While using netcdf, I found everything fine except that the performance was poor.
>     So I used PnetCDF. On single node, it functioned well. But when it is used in cluster, the netcdf file it generated is wrong and unreadable. I cannot figure oit why. Is it that PnetCDF does not support multi-node application? Is it that I didn't use distribute file system? Or some other reason?
> 
> Best Regards
> Xie Bin

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