<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, May 18, 2015 at 8:29 AM, venkatesh g <span dir="ltr"><<a href="mailto:venkateshgk.j@gmail.com" target="_blank">venkateshgk.j@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div><div>Hi I have attached the performance logs for 2 jobs on different processors. I had to increase the workspace icntl(14) when I submit on more cores since it is failing with small value of icntl(14).<br><br></div>1. performance_log1.txt is run on 8 cores (option given -mat_mumps_icntl_14 200)<br></div>2. performance_log2.txt is run on 2 cores (option given -mat_mumps_icntl_14 85 )<br></div></div></blockquote><div><br></div><div>1) Your number of iterates increased from 7600 to 9600, but that is a relatively small effect</div><div><br></div><div>2) MUMPS is just taking a lot longer to do forward/backward solve. You might try emailing</div><div>the list for them. However, I would bet that your system has enough bandwidth for 2 procs</div><div>and not much more.</div><div><br></div><div> Thanks,</div><div><br></div><div> Matt</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div></div>Venkatesh<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, May 17, 2015 at 6:13 PM, Matthew Knepley <span dir="ltr"><<a href="mailto:knepley@gmail.com" target="_blank">knepley@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><span>On Sun, May 17, 2015 at 1:38 AM, venkatesh g <span dir="ltr"><<a href="mailto:venkateshgk.j@gmail.com" target="_blank">venkateshgk.j@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div><div>Hi, Thanks for the information. I now increased the workspace by adding '-mat_mumps_icntl_14 100' <br><br></div>It works. However, the problem is, if I submit in 1 core I get the answer in 200 secs, but with 4 cores and '-mat_mumps_icntl_14 100' it takes 3500secs.<br></div></div></blockquote><div><br></div></span><div>Send the output of -log_summary for all performance queries. Otherwise we are just guessing.</div><div><br></div><div> Matt</div><div><div><div><br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div></div><div>My command line is: 'mpiexec -np 4 ./ex7 -f1 a2 -f2 b2 -eps_nev 1 -st_type sinvert -eps_max_it 5000 -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_package mumps -mat_mumps_icntl_14 100'<br><br></div><div>Kindly let me know.<br><br></div><div></div><div>Venkatesh<br></div><div><div><div><br><br></div></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, May 16, 2015 at 7:10 PM, David Knezevic <span dir="ltr"><<a href="mailto:david.knezevic@akselos.com" target="_blank">david.knezevic@akselos.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><span><div>On Sat, May 16, 2015 at 8:08 AM, venkatesh g <span dir="ltr"><<a href="mailto:venkateshgk.j@gmail.com" target="_blank">venkateshgk.j@gmail.com</a>></span> wrote:<br></div></span><div class="gmail_extra"><div class="gmail_quote"><span><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr"><div><div><div><div><div><div>Hi,<br></div>I am trying to solving AX=lambda BX eigenvalue problem.<br><br></div>A and B are of sizes 3600x3600<br><br></div>I run with this command :<br><br>'mpiexec -np 4 ./ex7 -f1 a2 -f2 b2 -eps_nev 1 -st_type sinvert -eps_max_it 5000 -st_ksp_type preonly -st_pc_type lu -st_pc_factor_mat_solver_package mumps'<br><br></div>I get this error: (I get result only when I give 1 or 2 processors)<br>Reading COMPLEX matrices from binary files...<br>[0]PETSC ERROR: --------------------- Error Message ------------------------------------<br>[0]PETSC ERROR: Error in external library!<br>[0]PETSC ERROR: Error reported by MUMPS in numerical factorization phase: INFO(1)=-9, INFO(2)=2024<br></div></div></div></blockquote><div><br></div><div><br></div></span><div><div><div>The MUMPS error types are described in Chapter 7 of the MUMPS manual. In this case you have INFO(1)=-9, which is explained in the manual as:</div><div><br></div><div>"–9 Main internal real/complex workarray S too small. If INFO(2) is positive, then the number of entries that are missing in S at the moment when the error is raised is available in INFO(2). If INFO(2) is negative, then its absolute value should be multiplied by 1 million. If an error –9 occurs, the user should increase the value of ICNTL(14) before calling the factorization (JOB=2) again, except if ICNTL(23) is provided, in which case ICNTL(23) should be increased."</div><div><br></div><div>This says that you should use ICTNL(14) to increase the working space size:</div><div><br></div><div>"ICNTL(14) is accessed by the host both during the analysis and the factorization phases. It corresponds to the percentage increase in the estimated working space. When significant extra fill-in is caused by numerical pivoting, increasing ICNTL(14) may help. Except in special cases, the default value is 20 (which corresponds to a 20 % increase)."</div><div><br></div><div>So, for example, you can avoid this error via the following command line argument to PETSc: "-mat_mumps_icntl_14 30", where 30 indicates that we allow a 30% increase in the workspace instead of the default 20%.</div></div><span><font color="#888888"><div><br></div><div>David</div></font></span></div><div><br></div><div><br></div></div></div></div>
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</blockquote></div></div></div><br><br clear="all"><span class="HOEnZb"><font color="#888888"><span><div><br></div>-- <br><div>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>
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</blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature">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>
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