Impossible, please check the spelling, and make sure your<br>command line was not truncated.<br><br> Matt<br><br><div><span class="gmail_quote">On 2/9/07, <b class="gmail_sendername">Ben Tay</b> <<a href="mailto:zonexo@gmail.com">
zonexo@gmail.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">ya, i did use -log_summary. but no output.....<div><span class="e" id="q_110a6e11b336a4d1_1">
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<div><span class="gmail_quote">On 2/9/07, <b class="gmail_sendername">Barry Smith</b> <<a href="mailto:bsmith@mcs.anl.gov" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">bsmith@mcs.anl.gov</a>> wrote:
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<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0px 0px 0px 0.8ex; padding-left: 1ex;"><br>-log_summary<br><br><br>On Fri, 9 Feb 2007, Ben Tay wrote:<br><br>> Hi,<br>><br>> I've tried to use log_summary but nothing came out? Did I miss out
<br>> something? It worked when I used -info...<br>><br>><br>> On 2/9/07, Lisandro Dalcin <<a href="mailto:dalcinl@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">dalcinl@gmail.com
</a>> wrote:<br>> ><br>> > On 2/8/07, Ben Tay <
<a href="mailto:zonexo@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">zonexo@gmail.com</a>> wrote:<br>> > > i'm trying to solve my cfd code using PETSc in parallel. Besides the
<br>> > linear<br>> > > eqns for PETSc, other parts of the code has also been parallelized using
<br>> > > MPI.<br>> ><br>> > Finite elements or finite differences, or what?<br>> ><br>> > > however i find that the parallel version of the code running on 4<br>> > processors<br>
> > > is even slower than the sequential version.<br>> ><br>> > Can you monitor the convergence and iteration count of momentum and<br>> > poisson steps?<br>> ><br>> ><br>> > > in order to find out why, i've used the -info option to print out the
<br>> > > details. there are 2 linear equations being solved - momentum and<br>> > poisson.<br>> > > the momentum one is twice the size of the poisson. it is shown below:<br>> ><br>> > Can you use -log_summary command line option and send the output attached?
<br>> ><br>> > > i saw some statements stating "seq". am i running in sequential or<br>> > parallel<br>> > > mode? have i preallocated too much space?<br>> ><br>> > It seems you are running in parallel. The "Seq" are related to local,
<br>> > internal objects. In PETSc, parallel matrices have inner sequential<br>> > matrices.<br>> ><br>> > > lastly, if Ax=b, A_sta and A_end from MatGetOwnershipRange and b_sta<br>> > and
<br>> > > b_end from VecGetOwnershipRange should always be the same value, right?<br>> ><br>> > I should. If not, you are likely going to get an runtime error.<br>> ><br>> > Regards,<br>> >
<br>> > --<br>> > Lisandro Dalcín<br>> > ---------------<br>> > Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC)<br>> > Instituto de Desarrollo Tecnológico para la Industria Química (INTEC)
<br>> > Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)<br>> > PTLC - Güemes 3450, (3000) Santa Fe, Argentina<br>> > Tel/Fax: +54-(0)342-451.1594<br>> ><br>> ><br>> </blockquote>
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</span></div></blockquote></div><br><br clear="all"><br>-- <br>One trouble is that despite this system, anyone who reads journals widely<br>and critically is forced to realize that there are scarcely any bars to eventual
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