Thank you Barry for the reply. Yes I get more or less the same log when I run with the option -log_summary. Please have a look at the attached file.
Thanks Waad --- On Thu, 7/31/08, Barry Smith <bsmith at mcs.anl.gov> wrote: From: Barry Smith <[email protected]> Subject: Re: Performance Log Question To: petsc-users at mcs.anl.gov Date: Thursday, July 31, 2008, 9:27 PM From the file, it seems you never make an nontrivial PETSc calls. Do you get the same log if you just run with -log_summary? Barry Event Count Time (sec) Flops/ sec --- Global --- --- Stage --- Total Max Ratio Max Ratio Max Ratio Mess Avg len Reduct %T %F %M %L %R %T %F %M %L %R Mflop/s ------------------------------------------------------------------------------------------------------------------------ --- Event Stage 0: Main Stage ------------------------------------------------------------------------------------------------------------------------ On Jul 31, 2008, at 4:33 PM, Waad Subber wrote: > Hello, > > I am currently solving a 1.2 million by 1.2 million linear system > using PETSc 2.3.3, Patch 13 using domain decomposition (iterative > substructuring using a Krylov Subspace Solver). I'm using a 120 CPU > cluster with InfiniBand interconnect; each node has 8 cores -- 2 > quad-core Xeon CPUs (X5365) at 3.0 GHz, each node having 32 GB of RAM. > > After running my code, I generate a log using the following: > CALL PetscLogPrintSummary(PETSC_COMM_WORLD,"log.txt",ierr) > > When looking at the log output, I noticed that the peak and average > number of Flops seems fairly low -- in the case of one run, a peak > of 6.0e7 flops with an average value of 5.2e7. The exact log output > is: > > Max Max/Min Avg Total > Time (sec): 5.283e+01 1.02357 5.169e+01 > Objects: 2.600e+02 1.00000 2.600e+02 > Flops: 3.187e+09 1.69853 2.721e+09 3.265e+11 > Flops/sec: 6.165e+07 1.69865 5.264e+07 6.317e+09 > Memory: 6.081e+07 1.39801 6.608e+09 > MPI Messages: 1.067e+05 1.00000 1.067e+05 1.281e+07 > MPI Message Lengths: 5.205e+08 1.00081 4.875e+03 6.245e+10 > MPI Reductions: 1.898e+01 1.00000 > > Is my interpretation correct about this being a fairly low flop > count? Does this mean there's an issue with my code? > > I am attaching my log file > > Thanks > > Waad > > > <log.txt> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20080731/a618065e/attachment.htm>
