[Users] several questions on pugh

[Hee Il Kim]

Thanks Tom,

And I found CCTK_Proc#.out files were created. I emailed you
before I had a very strange problem that I couldn't use all the cpu cores
for some parameter files. I found that the problem seems to be caused
by httpd thorn but cure in Cactus development version. I don't know the
reason. Anyway thanks for your quick reply.

Regards,

Hee Il


2007/2/12, Tom Goodale <goodale at cct.lsu.edu>:
>
> Hi,
>
> you only need ghost-zones on internal processor boundaries.  So with 9
> procs you get 2x2x2 procs with 32 physical points each and one ghost zone
> each.
>
> Cheers,
>
> Tom
>
>
> On Mon, 12 Feb 2007, Hee Il Kim wrote:
>
> > Hi,
> >
> > I have several questions about pugh. When I run a 64 cubed single
> > cpu simulation, the cactus run shows
> >
> > INFO (CartGrid3D): x=>[0,63]  y=>[0,63]  z=>[0,63]
> > INFO (PUGH): MPI Evolution on 1 processors
> > INFO (PUGH): 3-dimensional grid functions
> > INFO (PUGH):   Size: 64 64 64
> > INFO (PUGH):   Processor topology: 1 x 1 x 1
> > INFO (PUGH):   Local load: 262144   [64 x 64 x 64]
> >
> > Nothing strange. But when I make a mpirun, for example, using 8 cpus (=8
> cpu
> > cores),
> >
> > INFO (CartGrid3D): x=>[0,63]  y=>[0,63]  z=>[0,63]
> > INFO (PUGH): MPI Evolution on 8 processors
> > INFO (PUGH): 3-dimensional grid functions
> > INFO (PUGH):   Size: 64 64 64
> > INFO (PUGH):   Processor topology: 2 x 2 x 2
> > INFO (PUGH):   Local load: 35937   [33 x 33 x 33]
> >
> > Why is the local load 33x33x33? I think it should be 32x32x32 or
> 34x34x34
> > if it includes ghostzones with stencil 1 ? I can get a correct result
> even
> > with this problem. What does the local load represent?
> >
> > In order to look into further, I tried to use CCTK_MyProcs function. But
> I
> > only get rank 0. In fact I don't know how to display the rank of
> computing
> > node cpus. I tried "-r[o|e]" option for cactus run but no lucks.
> >
> > I'm using 6 node intel dual core (presler 930) cluster. I use Cactus for
> > numerical relativity but I'm a newbie on computational science. I
> appreciate
> > your kind helps in advance.
> >
> > Kim, Hee Il
> > from Korea
> > heeilkim at gmail.com
> >
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