[petsc-users] FLOPS vs FLOPS/sec from PETSc -log_summary

[Ajit Desai]

Thanks, Justin and Barry,

That makes it clear now and I agree, using FLOP is sounds weird. However,
making it clear in the profiling section of PETSc manual would really help.
If I am not wrong, I couldn't find any such statement in PETSc manuals (for
ver-6.3.6).

my suggestion : FLOPc : Floating point operaions count. Also it goes well
with PETSc.



*Ajit Desai*
 PhD Scholar, Carleton University, Canada

On Wed, Feb 15, 2017 at 2:06 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:

>
>   In PETSc FLOPS refers to (F)loating (P)oint (OP)eration(s)  :-) Hence
> the confusing notation in our output.
>
>    Barry
>
> Yes. this is confusing but it ended up this way because no one says, "this
> calculation took 500 FLOP", that just sounds weird. Even Total FLOP sounds
> weird. Any suggestions for how to phrase it without the confusion?
>
>
>
> > On Feb 15, 2017, at 12:58 PM, Ajit Desai <aero.aju at gmail.com> wrote:
> >
> > Hello everyone,
> >
> > I am little unclear between Flops and Flops/sec in the performance
> profile obtained for my solver using -log_summary.
> > Usually, FLOPS stands for (Floating Point Operations Per Second) then
> what is Flops/sec produced by PETSc log_summary and how it is different
> from Flops?
> >
> > I have included the output for the reference below.
> >
> >                                              Max          Max/Min
> Avg            Total
> > Time (sec):                     6.782e+02      1.00003   6.782e+02
> > Objects:                          7.400e+01      1.02778   7.206e+01
> > Flops:                              5.451e+11      1.99585   4.518e+11
> 3.181e+14
> > Flops/sec:                       8.038e+08      1.99585   6.662e+08
> 4.690e+11
> > MPI Messages:               0.000e+00      0.00000   0.000e+00  0.000e+00
> > MPI Message Lengths:   0.000e+00      0.00000   0.000e+00  0.000e+00
> > MPI Reductions:             1.000e+00      1.00000
> >
> > Thanks in advance.
> > Ajit Desai
> >  PhD Scholar, Carleton University, Canada
>
>
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