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Hi Bojan,<br>
<br>
the PCILU package does not work with mpiaij matrices, same as PCICC.
Basically only PCSOR works. <br>
<br>
You can install the hypre package then you can use the hypre solvers
that also include an ILU PC names BILUT, however I did not had any
success to achieve convergence, even if my SPARSKIT ILU-BCGSTAB
converges very well. <br>
<br>
Hope this helped. <br>
<br>
Cheers<br>
<br>
Aron<br>
<br>
<br>
On 02/28/2012 08:47 AM, Bojan Niceno wrote:
<blockquote cite="mid:4F4C8690.3050700@psi.ch" type="cite">
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
Dear all,<br>
<br>
<br>
Max may be correct, but I encounter the same problem as Aron.
Neither PCILU nor PCICC work in parallel for me. Here is the
message I get:<br>
<br>
<tt>[0]PETSC ERROR: --------------------- Error Message
------------------------------------<br>
[0]PETSC ERROR: No support for this operation for this object
type!<br>
[0]PETSC ERROR: Matrix format mpiaij does not have a built-in
PETSc ICC!<br>
[0]PETSC ERROR:
------------------------------------------------------------------------<br>
[0]PETSC ERROR: Petsc Release Version 3.2.0, Patch 6, Wed Jan 11
09:28:45 CST 2012<br>
[0]PETSC ERROR: See docs/changes/index.html for recent updates.<br>
[0]PETSC ERROR: See docs/faq.html for hints about trouble
shooting.<br>
[0]PETSC ERROR: See docs/index.html for manual pages.<br>
<br>
</tt>Portion of the code which I use to set the solver contents
follows (I am aiming at CG+ICC combination):<br>
<br>
<tt>/* Create KPS content */<br>
KSPCreate(PETSC_COMM_WORLD, &ksp);<br>
KSPSetType(ksp ,KSPCG);<br>
<br>
/* Set operators */<br>
KSPSetOperators(ksp, A, A, DIFFERENT_NONZERO_PATTERN);<br>
<br>
/* Linear solver defaults (can be ove-ridden) */<br>
KSPGetPC(ksp, &pc);<br>
PCSetType(pc, PCICC);<br>
KSPSetTolerances(ksp, 1.e-5, PETSC_DEFAULT, PETSC_DEFAULT,
PETSC_DEFAULT);<br>
<br>
/* Run-time options (over-rides above) */<br>
KSPSetFromOptions(ksp);</tt><br>
<br>
What is going wrong here?<br>
<br>
<br>
Kind regards,<br>
<br>
<br>
Bojan<br>
<br>
<br>
On 2/26/2012 6:17 PM, Matthew Knepley wrote:
<blockquote
cite="mid:CAMYG4GnK-s+X=OJk596PsS3HBmoNxBOHLmCA2y4hf-rjOc2fCA@mail.gmail.com"
type="cite">On Sun, Feb 26, 2012 at 10:48 AM, Max Rudolph <span
dir="ltr"><<a moz-do-not-send="true"
href="mailto:maxwellr@gmail.com">maxwellr@gmail.com</a>></span>
wrote:<br>
<div class="gmail_quote">
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;"> MPIAIJ and SEQQIJ matrices are subtypes
of the AIJ matrix type. Looking at that table, you should be
able to use any of the PCs that supports AIJ and has an X
under 'parallel'. </blockquote>
<div><br>
</div>
<div>Max is correct. For instance, the most popular general
purpose parallel solver is ASM (Additive Schwarz Method),
which then</div>
<div>has a sequential subsolver for each block, which defaults
to ILU.</div>
<div><br>
</div>
<div> Matt</div>
<div> </div>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;"> <span class="HOEnZb"><font
color="#888888">
<div>Max</div>
</font></span>
<div class="HOEnZb">
<div class="h5">
<div><br>
<br>
<div class="gmail_quote">On Sun, Feb 26, 2012 at 8:16
AM, Aron Roland <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:aaronroland@gmx.de" target="_blank">aaronroland@gmx.de</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt
0pt 0pt 0.8ex; border-left: 1px solid rgb(204,
204, 204); padding-left: 1ex;"> Dear All,<br>
<br>
I hope somebody can help us on this or give at
least some clearance.<br>
<br>
We have just included PETSc as an solver for our
sparse matrix evolving from an unstructured mesh
advection scheme.<br>
<br>
The problem is that we are using the mpiaij matrix
type, since our matrix is naturally sparse.
However it seems that PETSc has no PC for this,
except the PCSOR, which showed to be not very
effective for our problem.<br>
<br>
All others give the error msg. of the mail
subject, where XXX are the different PC tried.<br>
<br>
The manual is a bit diffuse on this e.g.<br>
<br>
<a moz-do-not-send="true"
href="http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html"
target="_blank">http://www.mcs.anl.gov/petsc/documentation/linearsolvertable.html</a><br>
<br>
it is claimed that certain PC's are running on aij
matrices ... but these are to be defined either as
seq. or parallel (mpiaij) matrices. Moreover in
the above mentioned list are two columns
parallel/seriel, what is the intention of parallel
capability when not applicable to matrices stored
within the parallel mpiaij framework.<br>
<br>
I guess we just not understanding the concept or
have some other difficulties of understanding of
all this.<br>
<br>
Any comments help is welcome<span><font
color="#888888"><br>
<br>
Aron<br>
</font></span></blockquote>
</div>
<br>
</div>
</div>
</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>
<br>
<div class="moz-signature">-- <br>
<img src="cid:part1.03030003.05060006@wb.tu-darmstadt.de"
border="0"></div>
</blockquote>
<br>
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