[Trilinos-Users] Strange Problem Using View Mode

[Michael A Heroux]

Davood,

It it difficult to give detailed advice without more information.  However,
generally speaking ³View² mode has several restrictions:

* You must guarantee the integrity of the arrays you ask the Epetra matrix
object to use. 
* For each row, you can insert values only one time.

View mode is intended to wrap an existing Crs-like matrix.

If this does help, please give more detail.

Mike


On 12/7/07 10:04 PM, "Davood Ansari" <david.ansari at gmail.com> wrote:

> Hi 
> 
> I have built my Trilinos using intel's compilers mpi library.
> Every thing seems to work fine. Yet when I use the "View"
> mode when constructing objects It comes across all sorts of
> strange problems. For example when I try to construct my
> Epetra_Crs Matrix form a ready made Crs_Graph:
> 
>     Epetra_CrsMatrix A(Copy, Graph) ;
> 
> every thing is fine but the following leads to runtime errors:
> 
>     Epetra_CrsMatrix A(View, Graph) ;
> for example when I try to get a cout << endl << A this is what I get :
> ------------------------------------------------------------------------------
> -----------------------------------------------------------------------------
> 
> mpirun -np 2 ./parpoissons
> WARNING: Can't read mpd.hosts for list of hosts, start only on current
> 
> Dec  8 11:57:17         PID1: Assembling FE Sparse Matrix Structure ...
> Dec  8 11:57:17                 PID1: Loading MeshData.gms ...
> 
> Dec  8 11:57:17         PID0: Assembling FE Sparse Matrix Structure ...
> Dec  8 11:57:17                 PID0: Loading MeshData.gms ...
> 
> Epetra::CrsMatrix
> 
> Epetra::CrsMatrix
> 
> Number of Global Rows        = 29
> Number of Global Cols        = 29
> Number of Global Diagonals   = 29
> Number of Global Nonzeros    = 165
> Global Maximum Num Entries   = 9
> 
> 
> 
> 
> 
> Number of My Rows        = 15
> Number of My Cols        = 29
> Number of My Diagonals   = 15
> Number of My Nonzeros    = 71
> My Maximum Num Entries   = 5
> 
> 
> Number of My Rows        = 14
> Number of My Cols        = 29
> Number of My Diagonals   = 14
> Number of My Nonzeros    = 94
> My Maximum Num Entries   = 9
> 
>    Processor    Row Index    Col Index           Value
> rank 0 in job 1  davood_55948   caused collective abort of all ranks
>   exit status of rank 0: killed by signal 11
> ------------------------------------------------------------------------------
> -----------------------------------------------------------------------------
> 
> I had a similar run time issue when using "View" mode for constructing the
> Crs_Graph as well.
> In that case the Fill.Compelete() would return -1 as a runtime error whih is
> not explained in the
> documents as well. Every thing works fine when I use "Copy" mode.
> 
> Is this a bug or system configuration issue ?
> Please advise 
> Davood
> 
> 
> 
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> Trilinos-Users at software.sandia.gov
> http://software.sandia.gov/mailman/listinfo/trilinos-users


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