[petsc-users] Understanding PETSc -log_summary

[Ajit Desai]

Hello Everyone,
A couple of questions on the *-log_summary* provided by PETSc.

1. *Avg-Flops & Avg-Flops/sec* are averaged among the participating cores
or averaged over the simulation time or both?
2. *Max/Min Flops & Flops/sec* is an indication of load balancing?
In simulation-2 these ratios are high compared to simulation-1. Does that
mean simulation-2 is not well balanced?

Please follow the outputs from two different simulations
(Note: the problem size and the number of processors used are different).

*Simulation-1*
                                   Max           Max/Min        Avg
   Total
Time (sec):            4.208e+02      1.00005   4.208e+02
Objects:                 7.100e+01      1.00000   7.100e+01
Flops:                     3.326e+11      1.31175   3.017e+11  4.826e+13
Flops/sec:              7.904e+08      1.31175   7.169e+08  1.147e+11
MPI Messages:      0.000e+00      0.00000   0.000e+00  0.000e+00


*SImulation-2:*
                                  Max          Max/Min        Avg
Total
Time (sec):           8.434e+02      1.00000   8.434e+02
Objects:                7.300e+01      1.02817   7.102e+01
Flops:                   6.555e+11      1.85115   5.798e+11  3.711e+14
Flops/sec:            7.772e+08      1.85115   6.874e+08  4.400e+11
MPI Messages:    0.000e+00      0.00000   0.000e+00  0.000e+00

We're trying to understand the performance of our solver using these
outputs.
Any comments in relation to that will be helpful.

Thanks & Regards,
*Ajit Desai*
 PhD Scholar, Carleton University, Canada
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