Re: [netcdfgroup] NC4 question

• To: Wei Huang <huangwei@xxxxxxxx>
• Subject: Re: [netcdfgroup] NC4 question
• From: Rob Latham <robl@xxxxxxxxxxx>
• Date: Wed, 4 May 2011 15:38:45 -0500

On Wed, May 04, 2011 at 01:45:16PM -0600, Wei Huang wrote:
> Hi, there,
> 
> I tried to open a NetCDF3 file with NetCDF4 (parallel-enabled) code (as 
> below),
> and get the error message:
> 
> Problem to open: <vdras_input.nc>.
> Error status: NetCDF: Parallel operation on file opened for non-parallel 
> access
> Stop in file: <input_vdras_nc.F90>, line:   58
> 
> Anyone knows what is wrong here?
> 
> Thanks,
> 
> Wei
> 
> -----
> 
> ! Open the file.
> 
>    status = nf90_open(trim(input_flnm), NF90_NOWRITE, ncid, &
>                       comm = MPI_COMM_WORLD, &
>                       info = MPI_INFO_NULL)

When you pass in the comm and info parameters, you'll end up calling
nc_open_par, and that's apparently not valid for a NetCDF3 file...

I think if you have configured your NetCDF4 with parallel-netcdf
support, then you can read this classic formatted file in parallel.

==rob

-- 
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA

• References:
  • [netcdfgroup] NC4 question
    • From: Wei Huang