Messages in this thread | | | Date | Mon, 23 Mar 2015 07:44:37 -0600 | From | David Ahern <> | Subject | Re: [RFC/PATCH] perf record: Save build-id of DSO in callchains |
| |
On 3/23/15 2:18 AM, Namhyung Kim wrote: >> Just curious, could you try to measure the performance impact of this >> change? > > $ time perf record --call-graph dwarf -o kbuild.xxx -a -- sleep 30 > [ perf record: Woken up 34674 times to write data ] > [ perf record: Captured and wrote 9538.729 MB kbuild.xxx (1211997 samples) ] > > real 0m32.244s > user 0m1.097s > sys 0m8.997s > > $ time perf record --call-graph dwarf -o kbuild.yyy --buildid-callchain -a -- sleep 30 > [ perf record: Woken up 40902 times to write data ] > [ perf record: Captured and wrote 11208.500 MB kbuild.yyy (1433922 samples) ] > > real 2m21.695s > user 1m33.127s > sys 0m22.077s >
How many CPUs and processes?
David
| |