[yt-dev] embarrassingly parallel analysis

[Geoffrey So]

Nevermind, it was something stupid, I didn't install mpi4py for this
version of yt I was using, now it gives 1 and 0s for print
ytcfg.getint("yt", "__global_parallel_rank") after installing mpi4py 1.3.

From
G.S.

On Fri, Mar 16, 2012 at 4:59 PM, Geoffrey So <gsiisg at gmail.com> wrote:

> I can run parallelHOP in parallel, doesn't that mean I already have an
> mpi-capable interpreter?
>
> From
> G.S.
>
>
> On Fri, Mar 16, 2012 at 4:43 PM, Nathan Goldbaum <goldbaum at ucolick.org>wrote:
>
>> Hi Geoffrey,
>>
>> You may need to build an mpi-capable python interpreter by hand.  See:
>> http://mpi4py.scipy.org/docs/usrman/appendix.html#mpi-enabled-python-interpreter
>>
>>  Nathan Goldbaum
>> Graduate Student
>> Astronomy & Astrophysics, UCSC
>> goldbaum at ucolick.org
>> http://www.ucolick.org/~goldbaum
>>
>> On Mar 16, 2012, at 4:37 PM, Geoffrey So wrote:
>>
>> Hi all, I was trying out pobj_demo.py from the workshop to see if I can
>> parallelize my halo analysis script, but I ran into the problem where I see:
>>
>> >mpirun -n 2 python pobj_demo.py --parallel
>>
>> gives a warning at the end
>>
>> yt : [WARNING  ] 2012-03-16 16:25:05,445 parallel_objects() is being used
>> when parallel_capable is false. The loop is not being run in parallel. This
>> may not be what was expected.
>>
>> I've done a
>> yt instinfo -u and got the latest tip:
>>
>> 052fac826701 (yt) tip
>>
>> but the problem persists.  I've tried printing inside the parallel loops
>>
>> for sto, sp in parallel_objects(spheres, num_procs, storage = my_storage):
>>     print ytcfg.getint("yt", "__global_parallel_rank")
>>     sto.result = sp.quantities['TotalQuantity']('CellMass')
>>     sto.result_id = '%4e %4e %4e' % (sp.center[0],
>> sp.center[1],sp.center[2])
>>
>> and I always get "0", but 20 of them, so I'm guessing that confirms the
>> loop isn't running in parallel, and just runs the 10 spheres serially on 2
>> processors, so I get double the results.
>>
>> Am I doing something wrong or missed something?
>>
>> From
>> G.S.
>>
>>
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