Re: 'perf stat --repeat N' oddity/regression

Em Tue, Jan 26, 2016 at 09:08:22AM +0100, Ingo Molnar escreveu: > > * Arnaldo Carvalho de Melo wrote: > > > Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > > > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > > > > > So it appears it broke

Re: 'perf stat --repeat N' oddity/regression

* Arnaldo Carvalho de Melo wrote: > Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 > > > install > > > displays: >

Re: 'perf stat --repeat N' oddity/regression

* Arnaldo Carvalho de Melo wrote: > Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 > > > install

Re: 'perf stat --repeat N' oddity/regression

Em Tue, Jan 26, 2016 at 09:08:22AM +0100, Ingo Molnar escreveu: > > * Arnaldo Carvalho de Melo wrote: > > > Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > > > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > > > > > So it

Re: 'perf stat --repeat N' oddity/regression

Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install > > displays: > > > > 16,244,802,268 instructions

Re: 'perf stat --repeat N' oddity/regression

Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install > displays: > > 16,244,802,268 instructions ( +- 23.01% ) > >2.108676769 seconds time elapsed

Re: 'perf stat --repeat N' oddity/regression

So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install displays: 16,244,802,268 instructions ( +- 23.01% ) 2.108676769 seconds time elapsed ( +- 0.86% ) [a few minutes later] Bisected it down to:

'perf stat --repeat N' oddity/regression

So I just noticed this 'perf stat --repeat' oddity: triton:~/tip> perf stat --repeat 3 -a -e instructions taskset 1 perf bench sched pipe -l 100 # Running 'sched/pipe' benchmark: # Executed 100 pipe operations between two processes Total time: 2.068 [sec] 2.068208 usecs/op

Re: 'perf stat --repeat N' oddity/regression

So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install displays: 16,244,802,268 instructions ( +- 23.01% ) 2.108676769 seconds time elapsed ( +- 0.86% ) [a few minutes later] Bisected it down to:

'perf stat --repeat N' oddity/regression

So I just noticed this 'perf stat --repeat' oddity: triton:~/tip> perf stat --repeat 3 -a -e instructions taskset 1 perf bench sched pipe -l 100 # Running 'sched/pipe' benchmark: # Executed 100 pipe operations between two processes Total time: 2.068 [sec] 2.068208 usecs/op

Re: 'perf stat --repeat N' oddity/regression

Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install > displays: > > 16,244,802,268 instructions ( +- 23.01% ) > >2.108676769 seconds time elapsed

Re: 'perf stat --repeat N' oddity/regression

Em Mon, Jan 25, 2016 at 04:43:33PM -0300, Arnaldo Carvalho de Melo escreveu: > Em Mon, Jan 25, 2016 at 07:35:11PM +0100, Ingo Molnar escreveu: > > > > So it appears it broke somewhere between v4.0 and v4.1, as the v4.0 install > > displays: > > > > 16,244,802,268 instructions