<div dir="ltr"><div>Is it possible to download this particular matrix, so I can do standalone investigation?</div><div><br></div><div>Sherry<br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, May 22, 2018 at 12:22 PM, Eric Chamberland <span dir="ltr"><<a href="mailto:Eric.Chamberland@giref.ulaval.ca" target="_blank">Eric.Chamberland@giref.ulaval.ca</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi Fande,<br>
<br>
I don't know, I am working and validating with a DEBUG version of PETSc, and this "mwe" is a 30x30 matrix...<br>
<br>
But I "hope" the parallel version is faster for large problems... if it is not maybe it should be somewhat reviewed...<span class="HOEnZb"><font color="#888888"><br>
<br>
Eric</font></span><span class=""><br>
<br>
<br>
On 22/05/18 02:22 PM, Fande Kong wrote:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
Hi Eric,<br>
<br>
I am curious if the parallel symbolic factoriation is faster than the sequential version? Do you have timing?<br>
<br>
<br>
Fande,<br>
<br></span><span class="">
On Tue, May 22, 2018 at 12:18 PM, Eric Chamberland <<a href="mailto:Eric.Chamberland@giref.ulaval.ca" target="_blank">Eric.Chamberland@giref.ulaval<wbr>.ca</a> <mailto:<a href="mailto:Eric.Chamberland@giref.ulaval.ca" target="_blank">Eric.Chamberland@giref<wbr>.ulaval.ca</a>>> wrote:<br>
<br>
<br>
<br>
On 22/05/18 02:03 PM, Smith, Barry F. wrote:<br>
<br>
<br>
Hmm, why would<br>
<br>
the resolution with *sequential* symbolic factorisation<br>
gives ans err around 1e-6 instead of 1e-16 for parallel one<br>
(when it works).<br>
<br>
<br>
? One would think that doing a "sequential" symbolic<br>
factorization won't affect the answer to this huge amount?<br>
Perhaps this is the problem that needs to be addressed.<br>
<br>
<br>
I do agree that this is a huge amount of difference... and if we<br>
agree this is also a bug, than it means there are not one but two<br>
bugs that deserve to be fixed...<br>
<br>
Thanks,<br>
<br>
Eric<br>
<br>
<br>
</span></blockquote>
</blockquote></div><br></div>