Hi David, On Tue, Mar 10, 2015 at 08:25:27AM -0600, David Ahern wrote: > On 3/10/15 12:06 AM, Namhyung Kim wrote: > >Hi Arnaldo, > > > >On Mon, Mar 09, 2015 at 10:21:35AM -0300, Arnaldo Carvalho de Melo wrote: > >>For trace I need to take advantage of the fact that each mmap is ordered > >>already and then just sort by the timestamp in the mmap head, etc. > >> > >>In retrospect, the perf.data file should have kept that ordering, i.e. > >>have one file per mmap, that would be saved in parallel, without any of > >>those PERF_RECORD_FINISHED_ROUND records. > >> > >>But I have to experiment with that, leaving the existing code around to > >>deal with older files. > > > >It seems like what you said is almost same as my multi-thread work. > >It saves data files per mmap and then merges them with an index > >table so that they can be processed in parallel. > > I think you and Jiri both have worked on saving a file per mmap. Where does > that stand? I would like to try it out.
It's available on perf/threaded-v3 branch in my tree. You can see the description and numbers at https://lkml.org/lkml/2015/3/2/988. Also you can index your data file and then process with multi-thread: $ perf data index -i perf.data -o perf.data.idx $ perf report --multi-thread -i perf.data.idx Thanks, Namhyung > > With the 1024 cpu systems I am seeing 5GB files in 1 second runs and perf is > not handling it well. The perf-script/perf-report (stdio) will 'hang' for 45 > minutes munging through the file. I have to connect gdb from time to time to > verify it is making progress (file_offset is increasing). I believe what > happens is that there is 'no round' -- it has to process all mmaps (1024 > cpus and 6 or 7 events) through the ordered events queue before it can push > out results. I need to look at that once I figure out the task scheduler > problem. > > David > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
