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<div class="moz-cite-prefix">On 17.08.2012 14:52, Jed Brown wrote:<br>
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<blockquote
cite="mid:CAM9tzSnjgz=0pxRTsjNLmSbkaT7f7uwVX+Q=Ls-t9E0dhvrZmw@mail.gmail.com"
type="cite">
<div class="gmail_quote"><span dir="ltr"></span><br>
<div>See this <b>ADDITIVE</b>? You are preconditioning with
I+P_{SOR}. You probably want multiplicative.</div>
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Jed,<br>
<br>
It didn't work.<br>
<br>
-pc_type composite -pc_composite_pcs shell,sor -pc_composite_type
multiplicative <br>
-----><br>
Linear solve did not converge due to DIVERGED_ITS iterations 250<br>
<br>
KSP Object:() 1 MPI processes<br>
type: tfqmr<br>
maximum iterations=250, initial guess is zero<br>
tolerances: relative=1e-07, absolute=1e-50, divergence=10000<br>
left preconditioning<br>
using PRECONDITIONED norm type for convergence test<br>
PC Object:() 1 MPI processes<br>
type: composite<br>
Composite PC type - MULTIPLICATIVE<br>
PCs on composite preconditioner follow<br>
....<br>
<br>
Is this something unexpected?<br>
I can try to write minimal example to make sure that this is not
related to my app itself.<br>
<br>
<pre class="moz-signature" cols="72">--
Regards,
Alexander</pre>
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