[petsc-dev] comments on make streams

[Matthew Knepley]

On Sun, Mar 23, 2014 at 12:29 PM, Jed Brown <jed at jedbrown.org> wrote:

> Handy visualization, though I think the red text is excessive [1] and as
> something unrelated from correctness of the installation, I'm not sure
> it should be displayed as part of "make all", especially when it doesn't
> run on batch systems.
>
> I see a lot of variability between runs (e.g., erratic performance on
> es.mcs.anl.gov attached), so perhaps we should be making box-and-whisker
> plots.  This is a balancing act because we don't want the test to take a
> long time to run.
>

I had to look this up. This would be fine for centers to post, but not as an
easy thing we run.


> While the "ideal speedup" line is visceral, it makes it hard to see
> what's actually happening.  I would either remove that line or add a
> second y axis that is unscaled (second attachment).  Either way, we
> should find a way to report numbers rather than unscaled speedup.
>

I think a second plot with effective bandwidth would be great. Putting it
on the first plot is too busy for me.

   Matt


> It's crazy that a plot of intra-node scalability of STREAMS is not
> posted prominently in computing facility documentation.
>
>
> [1] I still disagree with using colored text unconditionally.  I don't
> want control characters in log files and emails.  We could test whether
> output is going to a TTY so long as a separate stream is being sent to
> the screen than the log files.
>
>
>


-- 
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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