[Trilinos-Users] [EXTERNAL] zoltan weights and coordinates

Biddiscombe, John A. biddisco at cscs.ch
Fri Jul 31 04:05:10 EDT 2015

After a bit of debugging I see the problem,
CreateBasicVector calls
        ArrayRCP<const scalar_t> eltV(entries[v], 0, stride*numIds_, false);
which creates the array using numIds * stride, so the offsets are going to be all wrong.
I’d better look and see if there’s some way I can supply an ArrayRCP directly to the inputadapter


From: Trilinos-Users [mailto:trilinos-users-bounces at trilinos.org] On Behalf Of Biddiscombe, John A.
Sent: 31 July 2015 08:13
To: Devine, Karen D; trilinos-users at trilinos.org
Subject: Re: [Trilinos-Users] [EXTERNAL] zoltan weights and coordinates

Thanks for the explanation Karen,

Incidentally, I think I’ve found a bug. When the coordinate array is {{x,y,z},{x,y,z}, ….} I use

InputAdapter = new inputAdapter_t(localCount, globalIds, x, y, z, stride, stride, stride);

With stride set to 3, and x,y,z pointing to the first 3 elements of the array. The partitioning fails and the output is corrupted.

With an input of {{x,x,x…},{y,y,y…},{z,z,z…}}

And stride set to 1 with x,y,z pointing to begin, begin+localcount, begin+2*loclcount then it works fine.

Am I using the strided input syntax/format wrongly? (the input data is stored as {x,y,z}{x,y,z} so when I use this pattern it is the original data, when I use x,x,x,y,y,y,z,z,z then I make a copy and pass that in – which I’d like to avoid)



From: Karen Devine <kddevin at sandia.gov<mailto:kddevin at sandia.gov>>
Date: Thursday 30 July 2015 20:53
To: cscs <biddisco at cscs.ch<mailto:biddisco at cscs.ch>>, "trilinos-users at trilinos.org<mailto:trilinos-users at trilinos.org>" <trilinos-users at trilinos.org<mailto:trilinos-users at trilinos.org>>
Subject: Re: [EXTERNAL] [Trilinos-Users] zoltan weights and coordinates

Currently, scalar_t must be used for both weights and coordinates in Zoltan2.  This decision was made so that Zoltan2's templating would more closely match the rest of Trilinos/Tpetra.  Use of a separate zgid_t will likely be removed soon as well so that the templated types match Tpetra's.  If losing zgid_t will be harmful to you, let me know.


From: Trilinos-Users <trilinos-users-bounces at trilinos.org<mailto:trilinos-users-bounces at trilinos.org>> on behalf of Biddiscombe, John A. <biddisco at cscs.ch<mailto:biddisco at cscs.ch>>
Sent: Wednesday, July 29, 2015 8:23 AM
To: trilinos-users at trilinos.org<mailto:trilinos-users at trilinos.org>
Subject: [EXTERNAL] [Trilinos-Users] zoltan weights and coordinates

Am I correct in thinking that the template types declared for the vector Adaptor input to zoltan
scalar_t weights and vector element values
must be the same type for coordinates and weights.

I’d like to have a mixture of coords using double/float and the weights might even be int.

Is this supported?



John Biddiscombe,                        email:biddisco @.at.@ cscs.ch
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Trevano 131, 6900 Lugano, Switzerland   | Fax:  +41 (91) 610.82.82

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