<div class="gmail_quote">On Wed, Nov 23, 2011 at 05:43, Dominik Szczerba <span dir="ltr"><<a href="mailto:dominik@itis.ethz.ch">dominik@itis.ethz.ch</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div id=":273">In my procedure considerable time is spent to partition the domain.<br>
When using MUMPS as a solver for my matrix I see the message:<br>
<br>
"Ordering based on METIS"<br></div></blockquote><div><br></div><div>This is an ordering to reduce fill in factorization, not to to partition the domain. Last I heard, symbolic factorization was done in serial, which explains why you find it taking a lot of time. The right hand side and solution vectors are also passed on rank 0, which presents another inefficiency/imbalance and memory bottleneck. Talk to the MUMPS developers or use a different package if you don't like these properties.</div>
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