[MOAB-dev] writing in parallel

[Nico Schlömer]

> with options="PARALLEL=WRITE_PART;".

Just what I needed. Is this documented anywhere at all?

> write_mesh only works in serial.

Perhaps this could be communicated even more clearly by renaming the
function to something along the lines of `write_serial`. Alternatively, one
could think about removing that function altogether. `write_file("2.h5m")`
does the same as `write_mesh("2.h5m")`.

In addition, I found that setting the `file_type` in [1] doesn't do
anything. At least, illegal values aren't intercepted.

Cheers,
Nico

[1]
http://www.mcs.anl.gov/~fathom/moab-docs/html/classmoab_1_1Interface.html#a96c55cc351c6d44b88330a2bf692996b

On Sat, Jan 2, 2016 at 7:23 PM Vijay S. Mahadevan <vijay.m at gmail.com> wrote:

> Hi Nico,
>
> Yes write_mesh is implemented to work only in serial. It internally
> just calls write_file but with NULL options [1]. I believe write_mesh
> exists typically for debug purposes where we can dump the partial mesh
> from each process and analyze it. I don't see why this should be
> restricted this way and can certainly change that. Alternately, you
> can and should directly call write_file (which can store tags and
> other set data too) with options="PARALLEL=WRITE_PART;".
>
> Iulian, we should update the documentation to say that write_mesh only
> works in serial. Or optionally allow user to specify options so that
> both serial/parallel writes can be enabled. Also, the documentation
> for load_file and write_file should describe what typical options can
> be used to read/write in parallel.
>
> Vijay
>
> [1]
> http://www.mcs.anl.gov/~fathom/moab-docs/html/classmoab_1_1Core.html#afa9715e0c6aef68eb7bb84407cf15a5e
>
> On Sat, Jan 2, 2016 at 8:42 AM, Nico Schlömer <nico.schloemer at gmail.com>
> wrote:
> > Hi everyone,
> >
> > I'm trying to write a mesh in parallel with write_mesh [1].
> Unfortunately,
> > it appears that only one process actually writes the file (or the other
> > portions are overridden). I see there is also write_file [2]; haven't
> tried
> > it yet.
> >
> > Anything I should know?
> >
> > Cheers,
> > Nico
> >
> >
> > [1]
> >
> http://www.mcs.anl.gov/~fathom/moab-docs/html/classmoab_1_1Interface.html#a4d4d0fa72b9578bfd6f2ec8410fe207c
> > [2]
> >
> http://www.mcs.anl.gov/~fathom/moab-docs/html/classmoab_1_1Interface.html#a96c55cc351c6d44b88330a2bf692996b
>
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