From: Peter Zijlstra <peterz@infradead.org>
To: Glauber Costa <glommer@parallels.com>
Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
devel@openvz.org, Paul Turner <pjt@google.com>,
Tejun Heo <tj@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
handai.szj@gmail.com, Andrew.Phillips@lmax.com,
Serge Hallyn <serge.hallyn@canonical.com>
Subject: Re: [PATCH v3 4/6] add a new scheduler hook for context switch
Date: Wed, 30 May 2012 13:40:51 +0200 [thread overview]
Message-ID: <1338378051.26856.267.camel@twins> (raw)
In-Reply-To: <1338376851.26856.260.camel@twins>
On Wed, 2012-05-30 at 13:20 +0200, Peter Zijlstra wrote:
>
> $ perf stat -e cycles --repeat 100 perf bench sched messaging -p -g 100
>
> 48,826,146,710 cycles # 2.470 GHz ( +- 0.17% )
> 2.149005270 seconds time elapsed ( +- 0.12% )
A repeat count of 250 dropped it down to:
2.144582157 seconds time elapsed ( +- 0.08% )
Also, if you're poking at the context switch path, something like:
$ taskset 1 perf stat -e cycles --repeat 10 perf bench sched pipe -l 100000
gives a good number and is usually more stable than hackbench.
next prev parent reply other threads:[~2012-05-30 11:41 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-30 9:48 [PATCH v3 0/6] per cgroup /proc/stat statistics Glauber Costa
2012-05-30 9:48 ` [PATCH v3 1/6] measure exec_clock for rt sched entities Glauber Costa
2012-05-30 10:29 ` Peter Zijlstra
2012-05-30 10:32 ` Glauber Costa
2012-05-30 10:42 ` Peter Zijlstra
2012-05-30 10:42 ` Glauber Costa
2012-05-30 11:00 ` Paul Turner
2012-05-30 12:09 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 2/6] account guest time per-cgroup as well Glauber Costa
2012-05-30 10:32 ` Peter Zijlstra
2012-05-30 10:36 ` Glauber Costa
2012-05-30 10:46 ` Paul Turner
2012-05-30 9:48 ` [PATCH v3 3/6] expose fine-grained per-cpu data for cpuacct stats Glauber Costa
2012-05-30 10:34 ` Peter Zijlstra
2012-05-30 10:34 ` Glauber Costa
2012-05-30 10:43 ` Peter Zijlstra
2012-05-30 10:44 ` Glauber Costa
2012-05-30 11:24 ` Peter Zijlstra
2012-05-30 11:24 ` Paul Turner
2012-05-30 12:20 ` Glauber Costa
2012-05-30 12:48 ` Paul Turner
2012-05-30 12:52 ` Glauber Costa
2012-05-30 13:26 ` Glauber Costa
2012-05-30 13:26 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 4/6] add a new scheduler hook for context switch Glauber Costa
2012-05-30 11:20 ` Peter Zijlstra
2012-05-30 11:40 ` Peter Zijlstra [this message]
2012-05-30 12:08 ` Glauber Costa
2012-05-30 12:07 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 5/6] Also record sleep start for a task group Glauber Costa
2012-05-30 11:35 ` Paul Turner
2012-05-30 12:24 ` Glauber Costa
2012-05-30 12:44 ` Peter Zijlstra
2012-05-30 12:44 ` Glauber Costa
2012-05-30 9:48 ` [PATCH v3 6/6] expose per-taskgroup schedstats in cgroup Glauber Costa
2012-05-30 11:22 ` Peter Zijlstra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1338378051.26856.267.camel@twins \
--to=peterz@infradead.org \
--cc=Andrew.Phillips@lmax.com \
--cc=cgroups@vger.kernel.org \
--cc=devel@openvz.org \
--cc=ebiederm@xmission.com \
--cc=glommer@parallels.com \
--cc=handai.szj@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pjt@google.com \
--cc=serge.hallyn@canonical.com \
--cc=tj@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox