From: David Ahern <dsahern@gmail.com>
To: Namhyung Kim <namhyung@kernel.org>, Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Jiri Olsa <jolsa@redhat.com>, LKML <linux-kernel@vger.kernel.org>,
Frederic Weisbecker <fweisbec@gmail.com>,
Stephane Eranian <eranian@google.com>
Subject: Re: [RFC/PATCH] perf record: Save build-id of DSO in callchains
Date: Mon, 23 Mar 2015 07:44:37 -0600 [thread overview]
Message-ID: <551018C5.4030304@gmail.com> (raw)
In-Reply-To: <20150323081821.GE2782@sejong>
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
next prev parent reply other threads:[~2015-03-23 13:44 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-23 1:18 [RFC/PATCH] perf record: Save build-id of DSO in callchains Namhyung Kim
2015-03-23 7:22 ` Ingo Molnar
2015-03-23 8:18 ` Namhyung Kim
2015-03-23 13:44 ` David Ahern [this message]
2015-03-23 16:28 ` Arnaldo Carvalho de Melo
2015-03-23 23:30 ` Namhyung Kim
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