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
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