Dear WashUer's,
	What is the status of the configuration on the big US T3E's?  One
would hope tat as Bernd, Gerd, and Paul have found life on the T3E here, we
could go ahead and start up on 512 node machines tere (we have only 128
here).  What I am hoping for is that we can identify an interesting 3D
problem in the next week or two and then do a massive simulation at PSC or
NASA, in time for my plenary talk at GR15.  We are close to being able to
do that now, but only if we really coordinate and push forward will we be
able to come up with something great that we are confident of for such a
talk!

	So, if we find a Brill wave system collapsing to a BH, will be able
to do a huge, high res. case in the US?

	Ed



At 9:19 AM +0100 11/10/97, Bernd Bruegmann wrote:
> On Sun, 9 Nov 1997, Project ELLIPTIC/Wai-Mo Suen wrote: 
>  
> > Guys, 
> > 
> > How are elliptic solvers working on the T3E's in Europe? 
> > In particular, Bernd, how is BAM working at present? 
>  
> Basically since last week we now have PETSc and BAM working on the T3E at 
> ZIB: 
>  
> - With an increased allocation, Gerd got PETSc installed, and it works 
>   (maximal slicing, octant and full grid) 
>  
> - BAM_Elliptic (multigrid) compiled after minor changes, and it now works 
>   (initial data, maximal slicing, only full, only 2^n processors) 
>  
> Other people have also experience with the T3E in Garching. At the moment, 
> it is just me doing first tests at ZIB, and "it works" means that small 
> test problems give the right numbers. I just started testing on more 
> than 65^3. 
>  
> As to be expected, there still are minor technical problems when you do 
> something for the first time (/tmp/xx?! Thanks, Paul), and there are 
> surprises (why did PETSc dump core after three iterations on 129^3 in 
> convergence mode on Sunday? full moon?). 
>  
> In case you only heard about the problem but not that it is now solved, 
> with BAM_Elliptic I encountered an MPI request leak in Cactus on both the 
> T3E and the Origin (MPI crashed after a finite number of iterations), 
> which Paul finally located. 
>  
> In brief, now we have PETSc and BAM_Elliptic working on the T3E at ZIB, 
> although the installation must still be called weakly tested. 
>  
> Bernd 



===================================================
Ed Seidel
Max-Planck-Institut fuer Gravitationsphysik
Albert-Einstein-Institut
Schlaatzweg 1
D-14473 Potsdam, Germany
Tel. +49-331-27537-13
Fax +49-331-27537-98
===================================================

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