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<div class="moz-cite-prefix">On 26/3/2014 11:22 PM, Matthew Knepley
wrote:<br>
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<div class="gmail_quote">On Wed, Mar 26, 2014 at 9:59 AM, TAY
wee-beng <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:zonexo@gmail.com" target="_blank">zonexo@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I am running a CFD solver. The Poisson eqn was originally
solved using HYPRE's geometric multigrid.<br>
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<div>Is this on a structured grid?</div>
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<br>
Yes.<br>
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<div> Matt</div>
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<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Recently, I tested it with Boomeramg as the preconditioner
and GMRES as the ksp solver. There's a 20% increase in
speed.<br>
<br>
However, when I increased the grid resolution, I got the
out of memory error. Changing the solver back to HYPRE
solved the problem.<br>
<br>
So does GMRES + Boomeramg used more memory than other
solvers? Are there alternatives?<br>
<br>
Thank you.<span class="HOEnZb"><font color="#888888"><br>
<br>
-- <br>
Yours sincerely,<br>
<br>
TAY wee-beng<br>
<br>
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-- <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
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