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From: Francis Moreau <francis.moro@gmail.com>
To: Victor Jimenez <victor.javier@bsc.es>
Cc: Reid Kleckner <reid.kleckner@gmail.com>,
	Frederic Weisbecker <fweisbec@gmail.com>,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@elte.hu>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Arnaldo Carvalho de Melo <acme@redhat.com>,
	Stephane Eranian <eranian@google.com>,
	linux-perf-users@vger.kernel.org
Subject: Re: perf tools miscellaneous questions
Date: Fri, 05 Nov 2010 13:38:12 +0100	[thread overview]
Message-ID: <m2wros3pzf.fsf@gmail.com> (raw)
In-Reply-To: <fa.4sHfhlc/fMhpYgKda4IfUHZ7jMY@ifi.uio.no> (Victor Jimenez's message of "Thu, 04 Nov 2010 22:36:15 UTC")

Victor Jimenez <victor.javier@bsc.es> writes:

[...]

> If you are measuring last level cache misses, I would recommend you to
> use a memory intensive application/benchmark instead of /bin/true, as
> otherwise there can be a significant variation between two runs.

I agree.

But still with intensive application, I got the same results:


  $ perf stat -r3 -e cache-misses:u gzip -9 -c vmlinux.o >/dev/null

   Performance counter stats for 'gzip -9 -c vmlinux.o' (3 runs):

               950704  cache-misses               ( +-  24.925% )

         82.619412905  seconds time elapsed   ( +-   0.072% )


  $ perf stat -r3 -e llc-load-misses:u,llc-store-misses:u gzip -9 -c vmlinux.o >/dev/null

   Performance counter stats for 'gzip -9 -c vmlinux.o' (3 runs):
  
               317054  LLC-load-misses            ( +-  11.758% )
               162634  LLC-store-misses           ( +-   9.700% )

         82.657099783  seconds time elapsed   ( +-   0.167% )

Thanks
-- 
Francis

       reply	other threads:[~2010-11-05 12:38 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <fa.SSgtQesEhEQa5DUYUwBV3fWtoV4@ifi.uio.no>
     [not found] ` <fa.dD5ur5Phqa1TLmYBE2NVKCQMjTw@ifi.uio.no>
     [not found]   ` <fa.Xj1lA7n6nIJYL40CeRDpQzSKlfc@ifi.uio.no>
     [not found]     ` <fa.xcyA+VzIXesq6qsPU6ADM4xdCKY@ifi.uio.no>
     [not found]       ` <fa.MOg61Pcfdp2SJnwM2GFdOxP+xt0@ifi.uio.no>
     [not found]         ` <fa.4sHfhlc/fMhpYgKda4IfUHZ7jMY@ifi.uio.no>
2010-11-05 12:38           ` Francis Moreau [this message]
2010-11-05 14:02             ` perf tools miscellaneous questions Vince Weaver
2010-11-06 14:44               ` Francis Moreau
2010-11-06 20:50                 ` Vince Weaver
2010-11-06 20:52                   ` Vince Weaver
2010-11-08 19:43                   ` Francis Moreau
     [not found] <fa.eqFHAk86WhpTuYclHhngn7QZr8Y@ifi.uio.no>
     [not found] ` <fa.X++YRAJg+rmPtm3nmroZZoNU7u8@ifi.uio.no>
     [not found]   ` <fa.Elk8wOfBHRdKtkHIjP9hOtzVCgQ@ifi.uio.no>
     [not found]     ` <fa.U3fdWUGXguguIIyQ4v66/uKOhus@ifi.uio.no>
     [not found]       ` <fa.YTQQoGhoS6d3BaZXcZMN+l9TojQ@ifi.uio.no>
2010-11-04 20:58         ` Francis Moreau
2010-11-04 22:28           ` Victor Jimenez
     [not found] <fa.yHA7Aw03llqLWxPVYRnHvK5/dT8@ifi.uio.no>
     [not found] ` <fa.13KEqWk+Dk+jLLdFlAoZtQ2Vjuw@ifi.uio.no>
     [not found]   ` <fa.AGo9lmnVDcmFVUpOFG/kfd1aYfI@ifi.uio.no>
2010-11-04  8:34     ` Francis Moreau
2010-11-04  8:52   ` Francis Moreau
2010-11-07 21:40     ` Frederic Weisbecker
2010-11-09 11:07       ` Francis Moreau
     [not found] <fa.AyvjD8RxwvZsnL5ZXcZ+OzALKY8@ifi.uio.no>
     [not found] ` <fa.wlHJxDLDciTHF6/icJo+JfjJPus@ifi.uio.no>
     [not found]   ` <fa.8PQyp14JyjNgKJB4NUWsi+YoZBM@ifi.uio.no>
     [not found]     ` <fa.ZajcSOe/t8/XBoLV1hZ7SjSJvtI@ifi.uio.no>
2010-11-04  8:45       ` Francis Moreau
2010-11-03 19:28 Francis Moreau
2010-11-03 21:43 ` Frederic Weisbecker
2010-11-03 22:15   ` Reid Kleckner

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