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On 02/04/2015 02:45 PM, Nico Schlömer wrote:
What's the value of the mode argument you are passing to nc_open_par(const char *path, int mode, MPI_Comm comm, MPI_Info info, int *ncidp);The call is from [1] with ``` NC_NOWRITE == 0 NC_SHARE == 2048 pariomode == 32768
32768 is 0x8000 or NC_PNETCDF
``` so eventually the mode argument is ``` NC_NOWRITE|NC_SHARE|pariomode == 34816 ``` Looks suspicious?
No, that's all legal, if unusual -- I am glad to see you are exercising the "Argonne/Northwestern parallel netcdf" driver feature of NetCDF-4.
These flags will create a classic netcdf file. Why would such a file be unreadable on another system?Well, if the other system is also requesting NC_PNETCDF, it's possible the Unidata-NetCDF library was not built with pnetcdf support, though nc_open_par should just detect the format.
==rob
Cheers, Nico [1] https://github.com/trilinos/trilinos/blob/master/packages/seacas/libraries/exodus/cbind/src/ex_open_par.c#L180 On Wed, Feb 4, 2015 at 6:00 PM, Russ Rew <russ@xxxxxxxxxxxxxxxx> wrote:Hi Nico, What's the value of the mode argument you are passing to nc_open_par(const char *path, int mode, MPI_Comm comm, MPI_Info info, int *ncidp); ? --Russ On Tue, Feb 3, 2015 at 3:25 PM, Nico Schlömer <nico.schloemer@xxxxxxxxx> wrote:Hi all, I'm trying to read the file ``` http://win.ua.ac.be/~nschloe/other/pacman.e ``` in parallel with `nc_open_par` [1]. This works on one machine, but returns the error code `-51` ("Not a netCDF file") on another. Could someone clarify this? Cheers, Nico [1] https://github.com/Unidata/netcdf-c/blob/master/libdispatch/dparallel.c#L38 _______________________________________________ netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/_______________________________________________ netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
-- Rob Latham Mathematics and Computer Science Division Argonne National Lab, IL USA
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