Hi, I get relatively comparable results for both versions:
dev: ./step-23 55.55s user 1.64s system 131% cpu 43.637 total 8.0: ./step-23 55.85s user 1.48s system 129% cpu 44.130 total Is this the unmodified step-23 tutorial program? For measuring performance regressions a total runtime of less than 5 seconds doesn't say that much. Never versions allocate and precompute quite a bunch of stuff upfront which might result in a small (problem independent) fixed runtime overhead (of a second or less). Best, Matthias On Tue, Dec 26, 2017, at 05:52 CST, [email protected] wrote: > Deal.II 8.5.1 seems to be 20% slower than 8.0.0. This is the timing I get > when running the Step-23 tutorial (output to screen and vtk is suppressed): > > deal.II version 8.0.0: > > $ time ./step-23 > Number of active cells: 16384 > Number of degrees of freedom: 16641 > > real 0m3.432s > user 0m6.320s > sys 0m0.612s > > deal.II version 8.5.1: > > $ time ./step-23 > Number of active cells: 16384 > Number of degrees of freedom: 16641 > > real 0m4.430s > user 0m7.080s > sys 0m0.492s > > In general, I get about 20% slow down for my own code when upgrading from > 8.0.0 to 8.5.1. What is the reason of such a slow down? Does the deal.II > follow the right direction given new versions become gradually slower?! -- The deal.II project is located at http://www.dealii.org/ For mailing list/forum options, see https://groups.google.com/d/forum/dealii?hl=en --- You received this message because you are subscribed to the Google Groups "deal.II User Group" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
