<div dir="ltr"><div>Hi,</div><div><br></div>I have attached the log of the command which I gave in the master node: make streams NPMAX=32<div><br></div><div>I dont know why it says 'It appears you have only 1 node'. But other codes run in parallel with good scaling on 8 nodes.<br><br></div><div>Kindly let me know.<br></div><div><br></div><div>Venkatesh</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, May 18, 2015 at 11:21 PM, Barry Smith <span dir="ltr"><<a href="mailto:bsmith@mcs.anl.gov" target="_blank">bsmith@mcs.anl.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Run the streams benchmark on this system and send the results. <a href="http://www.mcs.anl.gov/petsc/documentation/faq.html#computers" target="_blank">http://www.mcs.anl.gov/petsc/documentation/faq.html#computers</a><br>
<div class="HOEnZb"><div class="h5"><br>
<br>
> On May 18, 2015, at 11:14 AM, venkatesh g <<a href="mailto:venkateshgk.j@gmail.com">venkateshgk.j@gmail.com</a>> wrote:<br>
><br>
> Hi,<br>
> I have emailed the mumps-user list.<br>
> Actually the cluster has 8 nodes with 16 cores, and other codes scale well.<br>
> I wanted to ask if this job takes much time, then if I submit on more cores, I have to increase the icntl(14).. which would again take long time.<br>
><br>
> So is there another way ?<br>
><br>
> cheers,<br>
> Venkatesh<br>
><br>
> On Mon, May 18, 2015 at 7:16 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
> On Mon, May 18, 2015 at 8:29 AM, venkatesh g <<a href="mailto:venkateshgk.j@gmail.com">venkateshgk.j@gmail.com</a>> wrote:<br>
> 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>
> 1. performance_log1.txt is run on 8 cores (option given -mat_mumps_icntl_14 200)<br>
> 2. performance_log2.txt is run on 2 cores (option given -mat_mumps_icntl_14 85 )<br>
><br>
> 1) Your number of iterates increased from 7600 to 9600, but that is a relatively small effect<br>
><br>
> 2) MUMPS is just taking a lot longer to do forward/backward solve. You might try emailing<br>
> the list for them. However, I would bet that your system has enough bandwidth for 2 procs<br>
> and not much more.<br>
><br>
> Thanks,<br>
><br>
> Matt<br>
><br>
> Venkatesh<br>
><br>
> On Sun, May 17, 2015 at 6:13 PM, Matthew Knepley <<a href="mailto:knepley@gmail.com">knepley@gmail.com</a>> wrote:<br>
> On Sun, May 17, 2015 at 1:38 AM, venkatesh g <<a href="mailto:venkateshgk.j@gmail.com">venkateshgk.j@gmail.com</a>> wrote:<br>
> Hi, Thanks for the information. I now increased the workspace by adding '-mat_mumps_icntl_14 100'<br>
><br>
> 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>
><br>
> Send the output of -log_summary for all performance queries. Otherwise we are just guessing.<br>
><br>
> Matt<br>
><br>
> 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>
> Kindly let me know.<br>
><br>
> Venkatesh<br>
><br>
><br>
><br>
> On Sat, May 16, 2015 at 7:10 PM, David Knezevic <<a href="mailto:david.knezevic@akselos.com">david.knezevic@akselos.com</a>> wrote:<br>
> On Sat, May 16, 2015 at 8:08 AM, venkatesh g <<a href="mailto:venkateshgk.j@gmail.com">venkateshgk.j@gmail.com</a>> wrote:<br>
> Hi,<br>
> I am trying to solving AX=lambda BX eigenvalue problem.<br>
><br>
> A and B are of sizes 3600x3600<br>
><br>
> 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>
> 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>
><br>
><br>
> 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:<br>
><br>
> "–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."<br>
><br>
> This says that you should use ICTNL(14) to increase the working space size:<br>
><br>
> "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)."<br>
><br>
> 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%.<br>
><br>
> David<br>
><br>
><br>
><br>
><br>
><br>
><br>
> --<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<br>
><br>
><br>
><br>
><br>
> --<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<br>
><br>
<br>
</div></div></blockquote></div><br></div>