On Mon, 30 Mar 2015 11:34:19 +0000 Anders Logg <[email protected]> wrote:
> See this question on the QA forum: > > http://fenicsproject.org/qa/6875/ubuntu-compile-from-source-which-provide-better-performance > > The Cahn-Hilliard demo takes 40 seconds with 1.3 Ubuntu packages and > 52 seconds with 1.5+ built from source. Are these regressions in > performance or is Johannes that much better at building Debian > packages than I am building FEniCS (with HashDist). > > PS: Looking at the benchbot, there seem to have been some regressions > in the timing facilities with the recent changes: Ok, I will look if something can be done with common-timing-cpp regression. I have a guess what causes that. Nevertheless, please note slowdown of la-vector-access-cpp. http://fenicsproject.org/benchbot/la-vector-access-cpp_last_five_years.png It could be a cause of the regression of Cahn-Hilliard demo. You could even try running it with uBLAS/UmfpackLUSolver on both versions to see whether the problem is in PETSc/wrappers. Jan > > http://fenicsproject.org/benchbot/ > > -- > Anders _______________________________________________ fenics mailing list [email protected] http://fenicsproject.org/mailman/listinfo/fenics
