[yt-dev] Parallelization & the ART frontend
Christopher Moody
cemoody at ucsc.edu
Wed Feb 8 12:00:22 PST 2012
Hi Matt,
I've got the log output here:http://paste.yt-project.org/show/2153/ with
the serial version here http://paste.yt-project.org/show/2154/ .
The most interesting tidbit is below, where it looks like core 0 projects
Levels 0-5 and core 1 projects Level 6 (which takes up like 99% of the
projection time.)
chris
P001 yt : [DEBUG ] 2012-02-08 11:39:53,403 Going to obtain []
P001 yt : [DEBUG ] 2012-02-08 11:39:53,406 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,406 End of projecting level level
0, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,406 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,406 End of projecting level level
1, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,407 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,407 End of projecting level level
2, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,408 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,408 End of projecting level level
3, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,408 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,408 End of projecting level level
4, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,409 Preloading ['density'] from 0
grids
P001 yt : [DEBUG ] 2012-02-08 11:39:53,409 End of projecting level level
5, memory usage 3.545e-01
P001 yt : [DEBUG ] 2012-02-08 11:39:53,409 Preloading ['density'] from 6
grids
P001 yt : [INFO ] 2012-02-08 11:39:53,410 Starting 'Projecting level
6 / 6 '
P000 yt : [INFO ] 2012-02-08 11:39:54,057 Finishing 'Projecting level
0 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:39:54,057 End of projecting level level
0, memory usage 4.482e-01
P000 yt : [DEBUG ] 2012-02-08 11:39:54,057 Preloading ['density'] from 1
grids
P000 yt : [INFO ] 2012-02-08 11:39:54,058 Starting 'Projecting level
1 / 6 'P000 yt : [INFO ] 2012-02-08 11:39:54,070 Finishing
'Projecting level 1 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:39:54,070 End of projecting level level
1, memory usage 4.482e-01
P000 yt : [DEBUG ] 2012-02-08 11:39:54,070 Preloading ['density'] from 1
gridsP000 yt : [INFO ] 2012-02-08 11:39:54,071 Starting 'Projecting
level 2 / 6 '
P000 yt : [INFO ] 2012-02-08 11:39:54,130 Finishing 'Projecting level
2 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:39:54,130 End of projecting level level
2, memory usage 4.482e-01
P000 yt : [DEBUG ] 2012-02-08 11:39:54,130 Preloading ['density'] from 1
grids
P000 yt : [INFO ] 2012-02-08 11:39:54,131 Starting 'Projecting level
3 / 6 '
P000 yt : [INFO ] 2012-02-08 11:39:54,783 Finishing 'Projecting level
3 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:39:54,784 End of projecting level level
3, memory usage 4.482e-01
P000 yt : [DEBUG ] 2012-02-08 11:39:54,784 Preloading ['density'] from 1
grids
P000 yt : [INFO ] 2012-02-08 11:39:54,784 Starting 'Projecting level
4 / 6 '
P000 yt : [INFO ] 2012-02-08 11:39:59,389 Finishing 'Projecting level
4 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:39:59,389 End of projecting level level
4, memory usage 5.918e-01
P000 yt : [DEBUG ] 2012-02-08 11:39:59,389 Preloading ['density'] from 1
grids
P000 yt : [INFO ] 2012-02-08 11:39:59,389 Starting 'Projecting level
5 / 6 '
P000 yt : [INFO ] 2012-02-08 11:40:17,735 Finishing 'Projecting level
5 / 6 '
P000 yt : [DEBUG ] 2012-02-08 11:40:17,735 End of projecting level level
5, memory usage 1.569e+00
P000 yt : [DEBUG ] 2012-02-08 11:40:17,735 Preloading ['density'] from 0
grids
P000 yt : [DEBUG ] 2012-02-08 11:40:17,736 End of projecting level level
6, memory usage 1.569e+00
P001 yt : [INFO ] 2012-02-08 11:41:31,681 Finishing 'Projecting level
6 / 6 '
P001 yt : [DEBUG ] 2012-02-08 11:41:31,681 End of projecting level level
6, memory usage 2.113e+00
P000 yt : [DEBUG ] 2012-02-08 11:41:33,807 Opening MPI Barrier on 0
P000 yt : [INFO ] 2012-02-08 11:41:34,502 Projection completed
P001 yt : [DEBUG ] 2012-02-08 11:41:34,502 Opening MPI Barrier on 1
P001 yt : [INFO ] 2012-02-08 11:41:34,502 Projection completed
P001 yt : [DEBUG ] 2012-02-08 11:41:34,579 Opening MPI Barrier on 1
On Wed, Feb 8, 2012 at 6:46 AM, Matthew Turk <matthewturk at gmail.com> wrote:
> Hi Chris,
>
> On Tue, Feb 7, 2012 at 9:30 PM, Christopher Moody <cemoody at ucsc.edu>
> wrote:
> > Hi guys,
> >
> > I've been working hard on the ART frontend. Lately, I'm to the point
> where
> > I'm playing around with more complex datasets that are taking much
> longer to
> > project - so I'd really like to to start using the parallelization
> engines.
> > I've tried Sam's workshop parallelization demos, and they all work. But
> > launching with the ART frontend (http://paste.yt-project.org/show/2152/)
> > spawns many independent processes which evidently are not actually
> splitting
> > the projection job, but still taking up lots of processors.
>
> My guess is that parallelism is not enabled for the ART frontend
> simply as a matter of how the IO is conducted. To make it really work
> in parallel, the IO needs to be split up so that when process 1 reads
> a given grid patch, the rest of the processors don't also need to read
> all the data for that grid patch.
>
> Can you lower your loglevel (by setting loglevel = 1 in ~/.yt/config
> or by --config yt.loglevel=1 on the command line) and report back with
> what it says during a projection job there?
>
> -MAtt
>
> >
> > My mpi installation works:
> > yt : [INFO ] 2012-02-07 18:12:28,207 Global parallel computation
> > enabled: 0 / 8yt : [INFO ] 2012-02-07 18:12:28,207 Global parallel
> > computation enabled: 2 / 8
> > yt : [INFO ] 2012-02-07 18:12:28,208 Global parallel computation
> > enabled: 1 / 8
> > yt : [INFO ] 2012-02-07 18:12:28,208 Global parallel computation
> > enabled: 6 / 8
> > yt : [INFO ] 2012-02-07 18:12:28,208 Global parallel computation
> > enabled: 3 / 8
> > yt : [INFO ] 2012-02-07 18:12:28,208 Global parallel computation
> > enabled: 4 / 8
> > yt : [INFO ] 2012-02-07 18:12:28,208 Global parallel computation
> > enabled: 5 / 8yt : [INFO ] 2012-02-07 18:12:28,209 Global parallel
> > computation enabled: 7 / 8
> >
> > But the script is just run 8 times, not any faster.
> >
> > What am I missing here?
> >
> > Many thanks!
> > chris
> >
> > _______________________________________________
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> >
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