From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51939) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZSfDD-0001oF-QG for qemu-devel@nongnu.org; Fri, 21 Aug 2015 01:50:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ZSfDA-0008SN-L9 for qemu-devel@nongnu.org; Fri, 21 Aug 2015 01:49:59 -0400 Received: from mail-pa0-x231.google.com ([2607:f8b0:400e:c03::231]:34771) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ZSfDA-0008SD-At for qemu-devel@nongnu.org; Fri, 21 Aug 2015 01:49:56 -0400 Received: by paom9 with SMTP id m9so11210060pao.1 for ; Thu, 20 Aug 2015 22:49:55 -0700 (PDT) Sender: Richard Henderson References: <55B9DD60.8020801@gmx.net> <20150730085500.GV11361@aurel32.net> <20150730155003.GE30591@aurel32.net> <20150731154323.GD23508@aurel32.net> <20150803091716.GF30591@aurel32.net> <55D37189.3010809@twiddle.net> <20150819110010.GJ23508@aurel32.net> <55D60C1B.9010502@twiddle.net> <55D6A9DF.5070506@gmx.net> From: Richard Henderson Message-ID: <55D6BC00.50200@twiddle.net> Date: Thu, 20 Aug 2015 22:49:52 -0700 MIME-Version: 1.0 In-Reply-To: <55D6A9DF.5070506@gmx.net> Content-Type: text/plain; charset=iso-8859-15; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Debian 7.8.0 SPARC64 on qemu - anything i can do to speedup the emulation? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Dennis Luehring , Artyom Tarasenko , Aurelien Jarno Cc: qemu-devel On 08/20/2015 09:32 PM, Dennis Luehring wrote: > gcc prime.c -o prime.out -lm > > prime.out runtime > > tcg-indirect: ~9.3 sec (best result) > qemu.org-git: ~11 sec > without-optimization: ~9.9 sec (worst result) I presume this is integer prime factoring? > g++ src/pugixml.cpp -g -Wall -Wextra -Werror -pedantic -std=c++0x -c -MMD -MP > > tcg-indirect: ~2:46.5 > qemu.org-git: ~2:51.2 (worst result) > without-optimization: ~2:14.1 (best result) No compiler optimization? I wouldn't expect there to be much for tcg to optimize there -- dropping values to memory all the time doesn't leave much. > > stream results (STREAM version $Revision: 5.10 $) > > tcg-indirect: (worst result) > > Your clock granularity/precision appears to be 41 microseconds. > Each test below will take on the order of 632527 microseconds. > (= 15427 clock ticks) > Function Best Rate MB/s Avg time Min time Max time > Copy: 320.8 0.511297 0.498785 0.590214 > Scale: 187.0 0.858693 0.855465 0.863527 > Add: 218.2 1.104654 1.099698 1.110341 > Triad: 169.5 1.433273 1.416321 1.502248 > > qemu.org-git: (best result) > > Your clock granularity/precision appears to be 42 microseconds. > Each test below will take on the order of 330428 microseconds. > (= 7867 clock ticks) > Function Best Rate MB/s Avg time Min time Max time > Copy: 771.5 0.214717 0.207377 0.244214 > Scale: 288.1 0.573320 0.555401 0.660161 > Add: 423.5 0.633523 0.566661 1.092067 > Triad: 242.9 1.053032 0.987970 1.499563 > > without-optimization: > > Your clock granularity/precision appears to be 41 microseconds. > Each test below will take on the order of 745254 microseconds. > (= 18176 clock ticks) > Function Best Rate MB/s Avg time Min time Max time > Copy: 316.6 0.524065 0.505313 0.580103 > Scale: 200.5 0.813356 0.798024 0.840986 > Add: 243.9 1.010247 0.984025 1.119149 > Triad: 182.9 1.345601 1.312236 1.427459 These results are weird. Unoptimized less than half the speed of mainline? Improving optimization (with no extra work, mind) brings the results back down? r~