On 02/04/2015 03:28 PM, Nico Schlömer wrote:
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?
As Jim says, if you've created a "classic format" netcdf file, you have
two options:
- read it serially
- convert it to "new format" (really HDF5)
==rob
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
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--
Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
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Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
