From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:33776)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1bl40M-0004nt-Rn
	for qemu-devel@nongnu.org; Fri, 16 Sep 2016 21:01:19 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1bl40J-0008AB-OB
	for qemu-devel@nongnu.org; Fri, 16 Sep 2016 21:01:18 -0400
Received: from mail-yw0-x22d.google.com ([2607:f8b0:4002:c05::22d]:35591)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <rth7680@gmail.com>) id 1bl40J-00089v-Jz
	for qemu-devel@nongnu.org; Fri, 16 Sep 2016 21:01:15 -0400
Received: by mail-yw0-x22d.google.com with SMTP id u82so94243902ywc.2
	for <qemu-devel@nongnu.org>; Fri, 16 Sep 2016 18:01:15 -0700 (PDT)
Sender: Richard Henderson <rth7680@gmail.com>
References: <1474048017-26696-1-git-send-email-rth@twiddle.net>
	<1474048017-26696-27-git-send-email-rth@twiddle.net>
	<20160916235421.GA18670@flamenco>
From: Richard Henderson <rth@twiddle.net>
Message-ID: <e23c4935-5a3e-05a5-97b4-5daf81b92b42@twiddle.net>
Date: Fri, 16 Sep 2016 18:01:12 -0700
MIME-Version: 1.0
In-Reply-To: <20160916235421.GA18670@flamenco>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH v4 26/35] tests: add atomic_add-bench
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel/>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: "Emilio G. Cota" <cota@braap.org>
Cc: qemu-devel@nongnu.org

On 09/16/2016 04:54 PM, Emilio G. Cota wrote:
> On Fri, Sep 16, 2016 at 10:46:48 -0700, Richard Henderson wrote:
>> From: "Emilio G. Cota" <cota@braap.org>
>>
>> With this microbenchmark we can measure the overhead of emulating atomic
>> instructions with a configurable degree of contention.
>>
>> The benchmark spawns $n threads, each performing $o atomic ops (additions)
>> in a loop. Each atomic operation is performed on a different cache line
>> (assuming lines are 64b long) that is randomly selected from a range [0, $r).
>>
>> [ Note: each $foo corresponds to a -foo flag ]
>
> Hi Richard,
>
> As I mentioned yesterday I have an updated version of this
> patch:  http://lists.gnu.org/archive/html/qemu-devel/2016-09/msg03450.html
> [ The major change is to run for a certain number of seconds, instead
>   of a fixed number of operations. ]
>
> I'll send the full updated patch as a reply to this message to make
> it easier to pick up.

Thanks, applied.


r~