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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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> 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. Oh wait, you mean pnetcdf (as opposed to Parallel I/O?). The configuration [1] on the machine which claims the file is not netCDF is ``` Configuration Summary: -- Building Shared Libraries: ON -- Building netCDF-4: ON -- Building DAP Support: ON -- Building Utilities: ON Building Parallel NetCDF -- Using pnetcdf: OFF -- Using Parallel IO: ON ``` I actually do *not* want pnetcdf for reading, I would like to use the Parallel IO feature built into netCDF itself. What option would I have to set for this? Cheers, Nico [1] https://launchpadlibrarian.net/196524671/buildlog_ubuntu-utopic-amd64.netcdf_1%3A4.3.3~20150204-utopic1_UPLOADING.txt.gz On Wed, Feb 4, 2015 at 11:09 PM, Rob Latham <robl@xxxxxxxxxxx> wrote: > > > 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 > > > _______________________________________________ > netcdfgroup mailing list > netcdfgroup@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/
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