[Python-Dev] Avoiding CPython performance regressions

[Fabio Zadrozny]

On Tue, Dec 1, 2015 at 9:35 AM, Victor Stinner <victor.stinner at gmail.com>
wrote:

> 2015-12-01 10:49 GMT+01:00 Fabio Zadrozny <fabiofz at gmail.com>:
> > As for the graph, it should be easy to customize (and I'm open to
> > suggestions). In the case, as it is, red is slower and blue is faster
> (so,
> > for instance in
> > https://www.speedtin.com/reports/1_CPython27x_Performance_Over_Time
>
> For me, -10% means "faster" in the context of a benchmark. On this
> graph, I see -21% but it's slower in fact. I'm confused.
>
> Victor
>

Humm, I understand your point, although I think the main reason for the
confusion is the lack of a real legend there...

I.e.: the reason it's like that is because the idea is that it's a
comparison among 2 versions, not absolute benchmark times, so negative
means one version is 'slower/worse' than another and blue means it's
'faster/better' (as a reference, Eclipse also uses the same format for
reporting it -- e.g.:
http://download.eclipse.org/eclipse/downloads/drops4/R-4.5-201506032000/performance/performance.php?fp_type=0
)

I've added a legend now, so, hopefully it clears up the confusion ;)

--
Fabio
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