From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from oss.sgi.com (localhost [127.0.0.1]) by oss.sgi.com (8.12.5/8.12.5) with ESMTP id g6PHElRw020798 for ; Thu, 25 Jul 2002 10:14:47 -0700 Received: (from majordomo@localhost) by oss.sgi.com (8.12.5/8.12.3/Submit) id g6PHEl4Z020797 for linux-mips-outgoing; Thu, 25 Jul 2002 10:14:47 -0700 X-Authentication-Warning: oss.sgi.com: majordomo set sender to owner-linux-mips@oss.sgi.com using -f Received: from av.mvista.com (gateway-1237.mvista.com [12.44.186.158]) by oss.sgi.com (8.12.5/8.12.5) with SMTP id g6PHEcRw020787 for ; Thu, 25 Jul 2002 10:14:39 -0700 Received: from mvista.com (av [127.0.0.1]) by av.mvista.com (8.9.3/8.9.3) with ESMTP id KAA06202; Thu, 25 Jul 2002 10:15:35 -0700 Message-ID: <3D40302F.40806@mvista.com> Date: Thu, 25 Jul 2002 10:06:55 -0700 From: Jun Sun User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020408 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Johannes Stezenbach CC: "Kevin D. Kissell" , linux-mips@oss.sgi.com Subject: Re: LL/SC benchmarking [was: Mipsel libc with LL/SC online anywhere?] References: <00ce01c229a4$a7d4ed40$10eca8c0@grendel> <20020719123828.GA5521@convergence.de> <20020725162539.GA8804@convergence.de> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, hits=0.0 required=5.0 tests= version=2.20 X-Spam-Level: Sender: owner-linux-mips@oss.sgi.com Precedence: bulk Johannes Stezenbach wrote: > On Fri, Jul 19, 2002 at 02:38:29PM +0200, Johannes Stezenbach wrote: > >>On Fri, Jul 12, 2002 at 03:04:07PM +0200, Kevin D. Kissell wrote: >> >>>I'm benchmarking some code that does lots of >>>semaphores, and with the libc from the "standard" >>>MIPS/SGI RH 7.1 distribution, those are done using >>>sysmips, in the interest of universality. >> >>I'm working on a platform without LL/SC, an embedded system/SOC >>with a NEC VR4120A CPU core. To find out the effect of sysmips >>vs. emulated LL/SC vs. the branch-likely trick posted by >>Kevin D. Kissell on Tue, 22 Jan 2002 18:16:25 +0100 >>I created an experimental patch for glibc-2.2.5 which allows >>run-time switching of the _test_and_set() and __compare_and_swap() >>implementation based on the presence of two "switch files" in /etc/. > > ... > >>For lack of a better benchmark I used some of the examples from >>glibc-2.2.5/linuxthreads/Examples. The numbers are from the third >>of three successive runs of 'time exN >/dev/null'. > > > I did some more benchmarking with a test application based on > gtk+-directfb (http://directfb.org/). The benchmark does not > include GUI stuff, but rather reading of lots of external data > into internal data structures (which are GLib-2.0 GObjects). > The test application has three threads, but nearly all processing > is done in the main thread. > > I think that the numbers are meaningful for our type of application. > > sysmips: > real 1m19.358s > user 0m28.150s > sys 0m47.250s > > LL/SC emulation: > real 0m41.246s > user 0m25.390s > sys 0m12.240s > > branch-likely hack (hm, still without kernel patch...): > real 0m25.126s > user 0m17.240s > sys 0m2.310s Johannes, This is great stuff! Can you explain what are "real", "user", and "sys"? Also, what is your initial conclusion? Jun