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<div class="moz-cite-prefix"> Mat seqMat;<br>
MatCreateSeqAIJ(PETSC_COMM_SELF, 10, 10, 0, PETSC_NULL,
&seqMat);<br>
<br>
Mat nestMat;<br>
MatCreateNest(PETSC_COMM_WORLD, 1, PETSC_NULL, 1, PETSC_NULL,
&seqMat, &nestMat);<br>
<br>
Results in the following error message:<br>
<br>
[0]PETSC ERROR: PetscSplitOwnership() line 93 in
/home/thomas/software/petsc-3.3-p0/src/sys/utils/psplit.c Sum of
local lengths 20 does not equal global length 10, my local length
10<br>
likely a call to VecSetSizes() or MatSetSizes() is wrong.<br>
See <a class="moz-txt-link-freetext" href="http://www.mcs.anl.gov/petsc/documentation/faq.html#split">http://www.mcs.anl.gov/petsc/documentation/faq.html#split</a><br>
[1]PETSC ERROR: PetscSplitOwnership() line 93 in
/home/thomas/software/petsc-3.3-p0/src/sys/utils/psplit.c Sum of
local lengths 20 does not equal global length 10, my local length
10<br>
likely a call to VecSetSizes() or MatSetSizes() is wrong.<br>
<br>
<br>
Thomas<br>
<br>
<br>
Am 04.09.2012 17:36, schrieb Matthew Knepley:<br>
</div>
<blockquote
cite="mid:CAMYG4GnmfQu6x8A9zXzqTHsRv9bW=FhZn682X5J+K6eRbALKsw@mail.gmail.com"
type="cite">On Tue, Sep 4, 2012 at 10:28 AM, Thomas Witkowski <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:thomas.witkowski@tu-dresden.de" target="_blank">thomas.witkowski@tu-dresden.de</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>Am 04.09.2012 17:20, schrieb Matthew Knepley:<br>
</div>
<blockquote type="cite">On Tue, Sep 4, 2012 at 9:52 AM,
Thomas Witkowski <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:thomas.witkowski@tu-dresden.de"
target="_blank">thomas.witkowski@tu-dresden.de</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<blockquote type="cite">
<div class="gmail_quote"><br>
<div><a moz-do-not-send="true"
href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATNEST.html"
target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MATNEST.html</a></div>
<div><br>
</div>
</div>
</blockquote>
As I wrote in my initial question, each rank
contains one and only one seqaij matrix, which all
should be joined to one global matrix such that each
local matrix is the corresponding diagonal block of
the mpiaij matrix. I think, this does not work with
nested matrices?<br>
</div>
</blockquote>
<div><br>
</div>
<div>Why does this not work? I really think you are
making this harder than it has to be.</div>
<div><br>
</div>
</div>
</blockquote>
Mh, maybe I have an incomplete view of the possibilities how
to use nested matrices.<br>
<br>
To become more specific: In the case of two mpi tasks, each
containing one seqaij matrix, how to call MatCreateNest? Is
this correct:<br>
<br>
Mat A;<br>
MatCreaeteNest(PETSC_COMM_WORLD, 2, PETSC_NULL, 2,
PETSC_NULL, V ,&A);<br>
</div>
</blockquote>
<div>
^^^ This should be 1. </div>
<div><br>
</div>
<div> Matt</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> and V is defined on
rank 0 as<br>
<br>
Mat V[2] = {seqMat, PETSC_NULL} ;<br>
<br>
and and rank 1 as<br>
<br>
Mat V[2] = {PETSC_NULL, seqMat};<br>
<br>
<br>
Thomas<br>
<blockquote type="cite">
<div class="gmail_quote">
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"> Thomas<br>
<br>
<blockquote type="cite">
<div class="gmail_quote">
<div> </div>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF"><br>
<blockquote type="cite">
<div>Hong<br>
<div class="gmail_quote">
<blockquote class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px #ccc
solid;padding-left:1ex">
<div text="#000000"
bgcolor="#FFFFFF">
<div>
<div>
<blockquote type="cite"> <br>
<div class="gmail_quote">Thomas
:<br>
<blockquote
class="gmail_quote"
style="margin:0 0 0
.8ex;border-left:1px
#ccc
solid;padding-left:1ex">In
my FETI-DP code, each
rank creates a SEQAIJ
matrix that represents
the discretization of
the interior domain.
Just for debugging, I
would like to join these
sequential matrices to
one global MPIAIJ
matrix. This matrix has
no off diagonal nnzs and
should be stored
corresponding to the
ranks unknowns, thus,
first all rows of the
first rank and so on.
What's the most
efficient way to do
this? Is it possible to
create this parallel
matrix just as a view of
the sequential ones, so
without copying the
data? Thanks for any
advise.</blockquote>
<div><br>
</div>
<div><a
moz-do-not-send="true"
href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateMPIAIJConcatenateSeqAIJ.html"
target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/Mat/MatCreateMPIAIJConcatenateSeqAIJ.html</a></div>
<div><br>
</div>
<div>Note: entries in
seqaij matrices are
copied into a mpiaij
matrix without</div>
<div>inter-processor
communication. Use
petsc-3.3 for this
function.</div>
</div>
</blockquote>
<br>
</div>
</div>
The function does not do what I
expect. For example, if we have
two mpi task and each contains one
local square matrix with n rows, I
want to create a global square
matrix with 2n rows. This function
create a non-square matrix of size
2n x n.<span><font color="#888888"><br>
<br>
Thomas<br>
</font></span></div>
</blockquote>
</div>
<br>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<span class="HOEnZb"><font color="#888888">
<div><br>
</div>
-- <br>
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<br>
</font></span></blockquote>
<br>
</div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
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<br>
</blockquote>
<br>
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