Messages in this thread | | | Subject | Re: `perf report` about 1000x(!) slower in linux 4.15 | From | Jan-Oliver Kaiser <> | Date | Tue, 20 Mar 2018 17:54:00 +0100 |
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The behavior persists with the most recent head of linux/master (1b5f3ba415fe4cf8b8b39c8d104ed44cde330658).
$ ./perf --version perf version 4.16.rc6.g1b5f3ba4
$ uname -r 4.15.9-towo.1-siduction-amd64
(This is a debian unstable variant.)
$ ./perf report --header-only -i <my_perf.data> # ======== # captured on: Fri Mar 16 18:14:05 2018 # hostname : blackbox # os release : 4.15.9-towo.1-siduction-amd64 # perf version : 4.15.4 # arch : x86_64 # nrcpus online : 4 # nrcpus avail : 4 # cpudesc : Intel(R) Core(TM) i7-5500U CPU @ 2.40GHz # cpuid : GenuineIntel,6,61,4 # total memory : 16343572 kB # cmdline : /usr/bin/perf_4.15 record -F 99 --call-graph dwarf -- coqc -q -I /home/janno/.opam/iris-mtac2/lib/coq//user-contrib/Unicoq -I src -Q tests Mtac2Tests -R theories Mtac2 timings/decapp_vs_mmatch.v # event : name = cycles:uppp, , size = 112, { sample_period, sample_freq } = 99, sample_type = IP|TID|TIME|ADDR|CALLCHAIN|PERIOD|REGS_USER|STACK_USER|DATA_SRC, disabled = 1, inherit = 1, exclude_kernel = 1, mma$ # CPU_TOPOLOGY info available, use -I to display # NUMA_TOPOLOGY info available, use -I to display # pmu mappings: intel_pt = 6, uncore_arb = 11, cstate_pkg = 14, breakpoint = 5, uncore_cbox_1 = 10, power = 12, cpu = 4, software = 1, uncore_imc = 8, uncore_cbox_0 = 9, cstate_core = 13, msr = 7 # CACHE info available, use -I to display # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT SAMPLE_TIME # ======== #
Best, Janno
On 03/20/2018 02:38 PM, Arnaldo Carvalho de Melo wrote: > Em Tue, Mar 20, 2018 at 12:57:29PM +0100, Jan-Oliver Kaiser escreveu: >> After upgrading my system to linux 4.15 (from 4.14), `perf report` became >> unusably slow. I estimate a decrease in performance by a factor of >> 100x-1000x. Some 21M perf.data files take about 30 seconds in the >> "Processing events" step. `git bisect` points to > >> commit d8a88dd243a170a226aba33e7c53704db2f82aa6 (HEAD, refs/bisect/bad) >> Author: Milian Wolff <milian.wolff@kdab.com> >> perf util: Enable handling of inlined frames by default > >> The slowdown can be worked around with `--no-inline`. If the slowdown is >> expected, I would suggest reverting the default setting here or maybe >> printing a warning if a lot of time is spent on this feature. > >> Do you need any additional information about my system or the recorded data >> I am looking at? > > Can you try with the latest perf tool? > > [acme@jouet perf]$ make perf-tarxz-src-pkg ; ls -la perf-4* > TAR > PERF_VERSION = 4.16.rc6.gecd380 > -rw-rw-r--. 1 acme acme 1323568 Mar 20 10:30 perf-4.16.0-rc6.tar.xz > [acme@jouet perf]$ > > With a recently checked out kernel sources, or, as a convenience, I'm > pushing this to: > > http://vger.kernel.org/~acme/perf/perf-4.16.0-rc6.tar.xz > > You just expand it and then: > > [acme@jouet tmp]$ tar xf perf-4.16.0-rc6.tar.xz > [acme@jouet tmp]$ cd perf-4.16.0-rc6/ > [acme@jouet perf-4.16.0-rc6]$ make -C tools/perf install-bin > > > And check if the problem is present there as well. > > If it is, please tell us what is your distro, the output of: > > perf report --header-only > > Thanks, > > - Arnaldo >
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