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<div class="moz-cite-prefix">Hallo Matthew,<br>
<br>
thanks for your fast response. With "no beside the nonzero
structure" I meant, that I do not create a different non-zero
structure while I'm adding values to my matrices.<br>
<br>
I also tried MAT_COPY_VALUES and the result was the same.<br>
<br>
I do not get a error message but the resulting matrix is wrong.
Here I have a short example. The first 9 rows and first 3 colomn
of the matrices Ah, At and Ah+At on the first processor (of 8):<br>
<br>
Ah: <br>
0: 60.3553 -0.249975
2.77556e-17<br>
1: 0
60.3553 0<br>
2: 0
0 60.3553<br>
3: 17.6777
0.374962 0.124987<br>
4: 0
17.6777 0<br>
5: 0
0 17.6777<br>
6: -7.32233
-0.124987 0.374962<br>
7: 0
-7.32233 0<br>
8: 0
0 -7.32233<br>
<br>
<br>
At:<br>
0: 0
0 0<br>
1: 2500
0 0<br>
2: -4.54747e-13
0 0<br>
3: 0
0 0<br>
4: 1250
0 0<br>
5: 1250
0 0<br>
6: 0
0 0<br>
7: 1250
0 0<br>
8: 3750
0 0<br>
<br>
Ah+At<br>
0: 60.3553 -0.249975
2.77556e-17<br>
1: 2500
60.3553 0<br>
2: -4.54747e-13
0 60.3553<br>
3: 17.6777
0.374962 0.124987<br>
4: 0
17.6777 0<br>
5: 0
0 17.6777<br>
6: -7.32233
-0.124987 0.374962<br>
7: 0
-7.32233 0<br>
8: 0
0 -7.32233<br>
<br>
you can see the first 3 rows of the resulting matrix looks exactly
like what I would expect, but the last 6 rows only consists of the
values of Ah. When you would also look on the matrix A and A+Ah+At
you would also see, that values where both matrices have an
nonzero entry are not sum correctly.<br>
<br>
Best<br>
<br>
Klaus<br>
<br>
On 03/27/2015 03:59 PM, Matthew Knepley wrote:<br>
</div>
<blockquote
cite="mid:CAMYG4Gn9BDVT+SkW6DbXnQby+H7E-hm7W27L1ptXPdd1bN0q-g@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">
<div class="gmail_quote">On Fri, Mar 27, 2015 at 9:48 AM,
Klaus Kaiser <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:kaiser@igpm.rwth-aachen.de" target="_blank">kaiser@igpm.rwth-aachen.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hallo,<br>
<br>
I have a strange behavior in my code concerning the
function MatAXPY. I create 3 different Matrices<br>
<br>
ierr = MatCreateBAIJ(PETSC_COMM_WORLD, block_size,
local_size, local_size, system_size, system_size, 0,
d_nnz, 0, o_nnz,&A);<br>
ierr = MatSetOption(A,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_TRUE);<br>
ierr = MatSetOption(A,MAT_KEEP_NONZERO_PATTERN,PETSC_TRUE);<br>
ierr = MatSetOption(A,MAT_IGNORE_OFF_PROC_ENTRIES,PETSC_TRUE);<br>
<br>
ierr = MatCreateBAIJ(PETSC_COMM_WORLD, block_size,
local_size, local_size, system_size, system_size, 0,
d_nnz, 0, o_nnz,&At);<br>
ierr = MatSetOption(At,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_TRUE);<br>
ierr = MatSetOption(At,MAT_KEEP_NONZERO_PATTERN,PETSC_TRUE);<br>
ierr = MatSetOption(At,MAT_IGNORE_OFF_PROC_ENTRIES,PETSC_TRUE);<br>
<br>
ierr = MatCreateBAIJ(PETSC_COMM_WORLD, block_size,
local_size, local_size, system_size, system_size, 0,
d_nnz, 0, o_nnz,&Ah);<br>
ierr = MatSetOption(Ah,MAT_NEW_NONZERO_ALLOCATION_ERR,PETSC_TRUE);<br>
ierr = MatSetOption(Ah,MAT_KEEP_NONZERO_PATTERN,PETSC_TRUE);<br>
ierr = MatSetOption(Ah,MAT_IGNORE_OFF_PROC_ENTRIES,PETSC_TRUE);<br>
</blockquote>
<div><br>
</div>
<div>These creations are superfluous since you use
MatDuplicate() below.</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
and want to sum these three matrixes with different
factors. First I fill the Matrix A with some values, and
duplicate the structure of A to the other two matrices:<br>
<br>
MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);<br>
MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);<br>
MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&Ah);<br>
MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,&At);<br>
MatAssemblyBegin(Ah,MAT_FINAL_ASSEMBLY);<br>
MatAssemblyEnd(Ah,MAT_FINAL_ASSEMBLY);<br>
MatAssemblyBegin(At,MAT_FINAL_ASSEMBLY);<br>
MatAssemblyEnd(At,MAT_FINAL_ASSEMBLY);<br>
</blockquote>
<div> <br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
After this I fill the matrices At and Ah with some other
values, which are not beside the non zero structure (I
also tried with just copying the Matrix A). Now after
another MatAssembly</blockquote>
<div><br>
</div>
<div>I do not understand "no beside the nonzero structure".
Do you mean that the nonzero structure is the same?</div>
<div><br>
</div>
<div>Can you first test with MAT_COPY_VALUES?</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex"> I want
to add these Matrices in the form A+c*(Ah+d*At): </blockquote>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
MatAXPY(Ah,c,At,SAME_NONZERO_PATTERN);<br>
MatAXPY(A,d,Ah,SAME_NONZERO_PATTERN);<br>
<br>
When I run the method with mpi and one core everything
works fine. Starting the same method with more cores, the
sum of the matrices fails. It seems like some values are
added</blockquote>
<div><br>
</div>
<div>Please send the full output of a failure when you use
MAT_COPY_VALUES on 2 procs.</div>
<div><br>
</div>
<div> Thanks,</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
correctly and many values are missed. Using
DIFFERENT_NONZERO_STRUCTURE leads to the right behavior in
the multi-core case, but is very slow. I checked with a
viewer if all matrices have the same nonzero structure and
this is the case.<br>
<br>
Does anyone know why this fails, or do I have made any
wrong thoughts?<br>
<br>
I'm corrently working with a petsc version (Petsc Release
Version 3.3.0, Patch 5, Sat Dec 1 15:10:41 CST 2012), I
looked into the changelogs up to the current version and
did not find any note about MatAXPY or MatAYPX.<br>
<br>
<br>
Best and Thanks a lot for your help<span class="HOEnZb"><font
color="#888888"><br>
<br>
Klaus<br>
<br>
</font></span></blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<div class="gmail_signature">What most experimenters take for
granted before they begin their experiments is infinitely
more interesting than any results to which their experiments
lead.<br>
-- Norbert Wiener</div>
</div>
</div>
</blockquote>
<br>
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