[petsc-users] A few questions about hdf5 viewer

[Mohamad M. Nasr-Azadani]

You should just create a parallel Vec to hold the 1D data. DAGetLocalInfo()
tells you all the local sizes.

Thanks Matt. But I am not sure how this would help since PETSC_COMM_WORLD
includes all the processors and in all three directions whereas the 1-D
data is only the size of Nx points.
This vector is not big at all, I could even create is on one processor. The
only concern that I have is
can I create an *.h5 file using PETSC_COMM_WORLD, dump the data, close the
file and then, re-open the file (append mode) with a different viewer
created via PETSC_COMM_SELF, and dump the coordinates vector to the end of
it? Of course, I only call PETSC_COMM_SELF on processor zero.

Thanks,
M


On Thu, Jan 19, 2012 at 4:33 PM, Matthew Knepley <knepley at gmail.com> wrote:

> On Thu, Jan 19, 2012 at 6:08 PM, Mohamad M. Nasr-Azadani <mmnasr at gmail.com
> > wrote:
>
>> Thanks Jed.
>> My solution to that was to create a 1D vector local to for instance
>> processor zero that holds all the coordinates. Then after I dumped all the
>> parallel data to the *.h5 file, I create another viewer on processor zero
>> or PETSC_COMM_SELF and dump that new vector including tHe coordinates to
>> the end of the existing file.
>> Do you think that should be possible?
>>
>
> You should just create a parallel Vec to hold the 1D data.
> DAGetLocalInfo() tells you all the local sizes.
>
>    Matt
>
>
>> Thanks,
>> Mohamad
>>
>>
>>
>>
>> On Thu, Jan 19, 2012 at 4:02 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
>>
>>> On Thu, Jan 19, 2012 at 18:00, Mohamad M. Nasr-Azadani <mmnasr at gmail.com
>>> > wrote:
>>>
>>>> What I need is just to add 3 1-D arrays of (x[Nx]+y[Ny]+z[Nz])
>>>> including the grid coordinates to the end of the *.h5 file and then later
>>>> on, I can use any visualization software to load the data using those
>>>> coordinates. I am using orthogonal grid, that's why I don't need  all the
>>>> (x,y,z) coordinates for each cell.
>>>
>>>
>>> If you want this special case, you have to manage it by hand.
>>>
>>
>>
>
>
> --
> What most experimenters take for granted before they begin their
> experiments is infinitely more interesting than any results to which their
> experiments lead.
> -- Norbert Wiener
>
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