On Tue, Feb 28, 2012 at 11:06 AM, Bojan Niceno <span dir="ltr"><<a href="mailto:bojan.niceno@psi.ch">bojan.niceno@psi.ch</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">
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Hi all,<br>
<br>
On 2/28/2012 5:41 PM, Matthew Knepley wrote:
<blockquote type="cite">
<div class="gmail_quote">Look, I already replied to this, and now
Jed had to reply again. If you are not going to read our mail,
why mail the list?</div>
</blockquote>
<br>
I am reading your messages, all right, but I also read PETSc's
errors and manuals. <br>
<br>
Look what the manual says on ICC:<br>
<br>
<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCICC.html" target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCICC.html</a><br>
<br>
"Notes: Only implemented for some matrix formats. Not implemented in
parallel."
<br>
<br>
<br>
And on ILU:<br>
<br>
<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCILU.html" target="_blank">http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCILU.html</a><br>
<br>
"Notes: Only implemented for some matrix formats. (for parallel see
<a href="http://www.mcs.anl.gov/petsc/petsc-current/docs/manualpages/PC/PCHYPRE.html#PCHYPRE" target="_blank">PCHYPRE</a>
for hypre's ILU)"<br>
<br>
<br>
So Matt, if I understand your answer correctly, one should use PCASM
to get ILU in parallel, right? What if I want IC? <br></div></blockquote><div><br></div><div>Or PCBJACOBI, or use Hypre for parallel ILU, or better yet do not use an unreliable preconditioner with poor scalability. How</div>
<div>does this lead you to conclude that SOR is the only thing you can run in parallel?</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">
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Thanks,<br>
<br>
<br>
Bojan<br>
<br>
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</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>