[petsc-users] -log_summary for MatMult

[Matthew Knepley]

On Fri, Jun 15, 2012 at 8:22 PM, Alexander Grayver
<agrayver at gfz-potsdam.de>wrote:

> Hello,
>
> When I call MatMult with MPIDENSE matrix in log summary I see:
>
> Event                Count      Time (sec)     Flops
>       --- 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
> ------------------------------**------------------------------**
> ------------------------------**------------------------------
> MatMult                1 1.0 9.5740e-01 1.5 8.19e+08 1.0 0.0e+00 0.0e+00
> 1.0e+00  2 40  0  0  5   2 40  0  0  6  3419
> MatMultTranspose       1 1.0 1.0793e+00 1.4 8.18e+08 1.0 0.0e+00 0.0e+00
> 2.0e+00  2 40  0  0 11   2 40  0  0 11  3030
>
>
> Why do number of messages and their length equal zero?


Because it uses only collectives.

   MAtt


>
> --
> Regards,
> Alexander
>
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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