<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial"><DIV><BR><BR>I use the two commands in the same project. The first is divergent while the second is convergent.<BR>nohup mpiexec -n 4 ./ex4f -ksp_type bcgs -pc_type bjacobi -ksp_rtol 1.0e-5 -ksp_converged_reason >out.txt &<BR>nohup mpiexec -n 8 ./ex4f -ksp_type bcgs -pc_type bjacobi -ksp_rtol 1.0e-5 -ksp_converged_reason >out.txt &</DIV>
<DIV>So what is the reason?</DIV>
<DIV>Thanks. Jim<BR><BR><BR></DIV>
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<DIV><BR></DIV>>> 2013-02-07 13:16:51£¬"Matthew Knepley" <knepley@gmail.com> дµÀ£º<BR>
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<DIV dir="ltr">>> On Thu, Feb 7, 2013 at 12:11 AM, w_ang_temp <SPAN dir="ltr"><<A href="mailto:w_ang_temp@163.com" target="_blank">w_ang_temp@163.com</A>></SPAN> wrote:<BR>
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<DIV>>> Hello,</DIV>
<DIV>>> I use the same project, but I find that when different number of processors is choosed,<BR>>> the convergence is different. For example, when the processors are 4, it is divergent; when<BR>>> the processors are 8, it is convergent.<BR>>> So what is the reason?<BR></DIV></DIV></BLOCKQUOTE>
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<DIV>>It is likely that your preconditioner changed.</DIV>
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<DIV> > Matt</DIV>
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<DIV>>> Thanks.<BR>>> Jim.</DIV></DIV><BR><BR><SPAN title="neteasefooter"><SPAN></SPAN></SPAN></BLOCKQUOTE></DIV><BR><BR clear="all">
<DIV><BR></DIV>-- <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 </DIV></DIV></BLOCKQUOTE></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>