[Qgis-psc] Performance regressions (was QGIS 2.18 bug fixing effort)

[Nyall Dawson]

On 23 May 2017 at 22:57, Giovanni Manghi <giovanni.manghi at gmail.com> wrote:
> here my new tests
>
>
> https://drive.google.com/file/d/0B8VD1V_leaeWNmpaOFNxZGxicVU/view?usp=sharing
>


Thanks Giovanni,

Some comments on these:

- it's not possible to directly compare the repo provided versions vs
self-compiled builds. They'll be built using different compilers with
different optimisation levels. Are you able to re-run the tests which
used the repo builds with self-compiled builds instead? Also please
make sure you're building using "Release" type builds, not "Debug".
(CMAKE_BUILD_TYPE should be "Release").

- Can you share the script you used to record the benchmarks?
Specifically, I'm wondering exactly what is being timed here. Is it
using the command line options to render a map (and accordingly
including project and layer load times), or timing canvas refreshes,
or using some custom Python script?

Thanks for the effort you're putting in here - I'm very keen to
identify whether we do have regressions here and if so track down
their source...

Nyall