yade-dev team mailing list archive

["Janek Kozicki (yade)" <jkozicki-yade@xxxxxxxxx>]

Yes, I think that we can stay with boost::python.
But we need to put minieigen sources back into yade.

best regards
Janek


Anton Gladky said:     (by the date of Sun, 23 Feb 2020 22:08:47 +0100)

> Hi Janek,
> 
> thanks a lot for this quick tests and results! Really impressive!
> 
> As far as I see, there is not benefit for us to replace boost::python,
> at least right now?
> 
> Regards
> 
> Anton
> 
> Am So., 23. Feb. 2020 um 16:02 Uhr schrieb Janek Kozicki (yade)
> <jkozicki-yade@xxxxxxxxx>:
> >
> > > Another note: I just realized that the compilation benchmarks might
> > > have not been fair, because I think that I added few more
> > > registrations (like Vector2c, or sth. like that) while doing pybind
> > > migration. I will compare again without these extra registrations.
> >
> > OK, I have compared with the exact same registrations. And it seems
> > that pybind has many advantages, but not the one that it is compiling
> > faster. See:
> >
> > pybind without debug info; call `ccache --clear` between every invocation.
> > -O3 -j 1                           -O3 -j 10
> >     wall clock time: 2:41.14           wall clock time: 0:40.67
> >     wall clock time: 2:46.56           wall clock time: 0:41.28
> >     wall clock time: 2:47.42           wall clock time: 0:42.54
> >     wall clock time: 2:43.79           wall clock time: 0:44.70
> >
> > -O1 -j 1                           -O1 -j 10
> >     wall clock time: 2:09.88           wall clock time: 0:35.00
> >     wall clock time: 2:10.78           wall clock time: 0:33.46
> >     wall clock time: 2:08.19           wall clock time: 0:32.62
> >     wall clock time: 2:10.10           wall clock time: 0:32.73
> >
> > ================================================================================
> > boost::python without debug info; call `ccache --clear` between every invocation.
> > -O3 -j 1                           -O3 -j 10
> >     wall clock time: 2:16.83           wall clock time: 0:33.88
> >     wall clock time: 2:15.96           wall clock time: 0:32.84
> >     wall clock time: 2:16.00           wall clock time: 0:34.85
> >     wall clock time: 2:16.52           wall clock time: 0:32.32
> >
> > -O1 -j 1                           -O1 -j 10
> >     wall clock time: 2:01.48           wall clock time: 0:28.56
> >     wall clock time: 2:00.70           wall clock time: 0:29.15
> >     wall clock time: 2:01.29           wall clock time: 0:28.05
> >     wall clock time: 2:00.56           wall clock time: 0:28.35
> >
> > The main pybind disadvantage is unstable API. I don't like writing
> > extra code to support older linux distributions.
> >
> >
> > Also I think that if while copying minieigen into yade we did some
> > extra rebalancing between the .cpp files, so that in each file there's
> > about the same amount of registrations performed, then we could
> > reduce (parallel) compilation time to maybe 25 or 20 seconds.
> >
> >
> > If you wanted to compile and try yourself, the comparison was between
> > branches master and tryPybind. To see how to compile see .gitlab-ci.yml,
> > I'm sorry that it's a bit messy. I was never good at using build
> > systems ;) I just wanted parallel build quickly. That's why I wrote
> > such strange makefile.
> >
> > best regards
> > Janek
> >
> >
> >
> > > Another comparison note:
> > >
> > > 8. boost::python is much more picky about the order of registered
> > >    functions, and sometimes does not work if the order is "wrong".
> > >    pybind always resolves the function overloads correctly.
> >
> > --
> > --
> > Janek Kozicki, PhD. DSc. Arch. Assoc. Prof.
> > Gdańsk University of Technology
> > Faculty of Applied Physics and Mathematics
> > Department of Theoretical Physics and Quantum Information
> > --
> > http://yade-dem.org/
> > http://pg.edu.pl/jkozicki (click English flag on top right)


-- 
--
Janek Kozicki, PhD. DSc. Arch. Assoc. Prof.
Gdańsk University of Technology
Faculty of Applied Physics and Mathematics
Department of Theoretical Physics and Quantum Information
--
http://yade-dem.org/
http://pg.edu.pl/jkozicki (click English flag on top right)