Tim, Valgrind is great but it is always slow. Instead you can use the AddressSanitizer from clang or gcc. It's much faster than Valgrind but I find the output is harder to read.
Best, Bruno Le lun. 2 oct. 2023 à 02:47, timo Hyvärinen <hyvarinentim...@gmail.com> a écrit : > Hi, Kendrick and Wolfgang, > > Thank you for your reply. > > I have two questions on hand: > (I) How to make the program run faster through Valgrind profiling? I know > I should use cachegrind and callgrind, but I don't know is what things I > should pay attention to from cachegrind/callgrind reports, what properties > have significant impact on speed; > (2) GPU acceleration (this may be a bad question for this thread, but I > really want to ask). I know dealii has CUDA wrapper and Kokkos leverage, > but what I don't know is how I can use them to speed up my matrix-based > newton iteration code. A straightforward idea in my mind is to use GPU for > system-matrix assembly, but I didn't see this in the only cuda tutorial > i.e., step-64. So I wonder what's the common way in deall for using GPU in > matrix-based code. > > Tim, > Sincerely > > On Mon, Oct 2, 2023 at 2:10 AM kendrick zoom <ken420st...@gmail.com> > wrote: > >> Hello Wolfgang, >> How are you doing today? >> >> Well your question is not quite clear. >> So what exactly do you want to know? >> >> On Sun, Oct 1, 2023 at 3:40 PM Wolfgang Bangerth <bange...@colostate.edu> >> wrote: >> >>> On 9/30/23 02:01, timo Hyvärinen wrote: >>> > >>> > So my questions here are (i) Did this issue ever happened for other >>> deal.II >>> > applications, how to solve it expect increase the number of nodes or >>> memory >>> > requirements; (ii) What kind of profiling/debugger tools >>> nowaday's deal.II >>> > experts are using to dress memory issue. Should I build Valgrind by >>> myself? >>> > Does Valgrind only support MPI 2, my openMPI is v.3. >>> >>> Valgrind doesn't care. >>> >>> 6.5*10^5 unknowns with a quadratic element in 3d can probably be >>> expected to >>> take in the range of 2-5 GB. That should fit into most machines. But at >>> the >>> same time, this is a small enough problem that you can run it under >>> valgrind's >>> memory profilers on any workstation or laptop you have access to. You >>> could >>> also talk to the system administrators of the cluster you work on to see >>> whether they are willing to give you a more up to date version of >>> valgrind. >>> >>> Best >>> W. >>> >>> -- >>> ------------------------------------------------------------------------ >>> Wolfgang Bangerth email: bange...@colostate.edu >>> www: >>> http://www.math.colostate.edu/~bangerth/ >>> >>> >>> -- >>> 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 dealii+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/dealii/0e01960a-3886-fc95-8332-a378acc1d7f8%40colostate.edu >>> . >>> >> -- >> 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 dealii+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/dealii/CAACKYBj65E817-x1GO%3DN7zrB5Op7X%3DFn1itAovnKaQ60CYyeyg%40mail.gmail.com >> <https://groups.google.com/d/msgid/dealii/CAACKYBj65E817-x1GO%3DN7zrB5Op7X%3DFn1itAovnKaQ60CYyeyg%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > 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 a topic in the > Google Groups "deal.II User Group" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/dealii/pkGlpp5uJUE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > dealii+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/dealii/CAArwj0FJ1EgswOFeSh2ECHH-GBnx54reEv8wXaT79%3DFL679%3D7w%40mail.gmail.com > <https://groups.google.com/d/msgid/dealii/CAArwj0FJ1EgswOFeSh2ECHH-GBnx54reEv8wXaT79%3DFL679%3D7w%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- 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. 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