OK, thanks :) And thanks for the link to sudoDEM :)
Bruno Chareyre said: (by the date of Sun, 1 Mar 2020 21:48:19 +0100) > (sorry for previous empty message) > Hi, > I don't think DEM can realistically work with floats. If 100 particles in a > row are elongated by 0.01%, the relative displacement between the 99th and > 100th particles is 1e-6 times the positions. With single precision it would > already produce substantial numerical noise in terms of contact force. > I mentioned single precision in relation with solving linear systems with > cholmod, and that part does not support HP. > I think we can skip the float pipeline. :) > Cheers > Bruno > > > > On Sun, 1 Mar 2020 at 16:24, Janek Kozicki (yade) <jkozicki-y...@pg.edu.pl> > wrote: > > > Hi, > > > > The high precision tests are now running in the gitlab pipeline. And > > we can be sure that `double` are not getting by accident into master. > > (except for the modules which are not supported by HP right now [1], > > in there some `double` could sneak in) > > > > This work also makes low-precision possible. I didn't add this to the > > pipeline, thinking it's not of much use. In some comment Bruno > > mentioned that some people want to use float in the GPUs to get the > > results faster. (Whether these results are correct is a topic for a > > different discussion :) > > > > I could prepare a merge request that adds float to the pipeline, > > because it is compiling (so it works) but it is not passing the tests. > > > > The disadvantage is that in many test scripts an exception will have > > to be written using following distinction: > > if (yade.config.highPrecisionDecimalPlaces < 7): > > > > That's because some of the tests produce different results when float > > is used, which is not a surprise ;) > > > > Currently yade --check has following failures on float: > > > > 7 checks are failed > > checkColliderConstantness.py > > checkViscElEng.py > > checkPotentialParticles.py > > checkColliderCorrectness.py > > checkJCFpm.py > > checkWirePM.py > > checkCapillaryModels.py > > > > And yade --test also has similar errors due to only 6 available > > decimal places. The log is longer, so I attach it. > > > > And most of these failures are because the results are compared with > > 1e-8 precision, while float maximally can offer 6 decimal places. > > > > best regards > > Janek > > > > > > [1] > > https://yade-dev.gitlab.io/-/trunk/-/jobs/455155443/artifacts/install/share/doc/yade-ci/html/HighPrecisionReal.html#supported-modules > > > > > > > > -- > > 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) > > _______________________________________________ > > Mailing list: https://launchpad.net/~yade-dev > > Post to : yade-dev@lists.launchpad.net > > Unsubscribe : https://launchpad.net/~yade-dev > > More help : https://help.launchpad.net/ListHelp > > > > > -- > -- > _______________ > Bruno Chareyre > Associate Professor > ENSE³ - Grenoble INP > Lab. 3SR > BP 53 > 38041 Grenoble cedex 9 > Tél : +33 4 56 52 86 21 > ________________ > > Email too brief? > Here's why: email charter > <https://marcuselliott.co.uk/wp-content/uploads/2017/04/emailCharter.jpg> -- -- 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) _______________________________________________ Mailing list: https://launchpad.net/~yade-dev Post to : yade-dev@lists.launchpad.net Unsubscribe : https://launchpad.net/~yade-dev More help : https://help.launchpad.net/ListHelp
