[Trilinos-Users] [EXTERNAL] Zoltan with Epetra_CrsMatrix
Devine, Karen D
kddevin at sandia.gov
Wed Apr 24 15:38:30 MDT 2013
You should look at the Trilinos package Isorropia, which provides an Epetra-based interface to Zoltan.
I find the easiest way to use Isorropia is with the create_balanced_copy method, which takes your input matrix and produces a new, redistributed matrix. The Isorropia parameter BALANCE OBJECTIVE allows balancing with respect to nonzeros.
Usage looks something like this:
Epetra_CrsMatrix *A = your_matrix;
paramlist.set("STRUCTURALLY SYMMETRIC", "YES");
paramlist.set("BALANCE OBJECTIVE", "NONZEROS");
Teuchos::RCP<Epetra_CrsMatrix> B =
A = B.get();
On 4/15/13 7:20 PM, "Sunghwan Choi" <sunghwanchoi91 at gmail.com<mailto:sunghwanchoi91 at gmail.com>> wrote:
Hi, I have a question on Zoltan;
I am originally Epetra user not Zoltan user. Now, my program suffers from load unbalance. To solve the problem, I considering using Zoltan or not.
My program basically uses Epetra_CrsMatrix. The main trouble is that numbers of non-zero values in rows is quite different. Thus, certain row has too many non-zero values while the other value has less non-zero values;
Is this situation proper to use Zoltan? and Does Zoltan support Epetra_CrsMatrix? Because I’ve never seen the example that use Zoltan with Epetra stuff.
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