Date: Mon, 04 Jun 2007 08:30:11 -0700 From: Garrett Cooper <youshi10@u.washington.edu> To: Joao Barros <joao.barros@gmail.com> Cc: current@freebsd.org Subject: Re: Kudos to everyone who worked on the gcc-4.2 merge Message-ID: <46643003.3070308@u.washington.edu> In-Reply-To: <46642F2A.8000501@u.washington.edu> References: <Pine.LNX.4.43.0706031730150.8063@hymn03.u.washington.edu> <20070604091628.51e9632a@kan.dnsalias.net> <70e8236f0706040705h6d459373n8fa83b32aeaca117@mail.gmail.com> <46642F2A.8000501@u.washington.edu>
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Garrett Cooper wrote: > Joao Barros wrote: >> On 6/4/07, Alexander Kabaev <kabaev@gmail.com> wrote: >>> On Sun, 3 Jun 2007 17:30:15 -0700 (PDT) >>> youshi10@u.washington.edu wrote: >>> >>> > I just wanted to thank everyone who helped make the gcc 4.2 merge >>> > possible -- I can see a noticeable performance increase (1.5x ~ 2.0x >>> > load time decrease) in my server (P4 HTT with SMP). >>> > >>> > This will be one of the great changes that will put FreeBSD back on >>> > the map closer to many Linux distros. >>> > >>> > Once gcc 4.2.1 gets in the tree, things will be much better, I'm >>> > sure :). >>> > >>> > Thank you very much, and let me know if you need testing with gcc >>> > 4.2.1 when it rolls around ;). >>> > >>> > -Garrett >>> > >>> Thanks, but I think kudos are addressed to wrong people. I very much >>> doubt that GCC can be responsible for any, let alone dramatic, >>> performance differences. Most likely you see effects of hard work done >>> by SMP scalability guys. >>> >>> -- >>> Alexander Kabaev >>> >>> >> >> I emailed Garrett but forgot to cc current@ >> >> My question was: "Can you specify the workload that you verify that >> much improvement?" >> Like you I had my doubts gcc was responsible for such an improvement. >> >> > The differences I saw (ok, limited), were a decrease in bootup time > (about 15-30 seconds faster), login via ssh (almost instantaneous when > the sshd thread seemingly hasn't gone to sleep), restarting the samba > daemon (3 seconds to ~1 second), and running make buildworld and > installworld. > > The only thing that I've noticed so far is that acpi is broken > again... I was shocked when I hit my power button and my machine > instantly shut off 0_0... > > Synced to HEAD yesterday and rebuilt. > > ASUS P4800DX motherboard with a P4 3.0GHz Northwood chip. > > -Garrett 3 other things I forgot to mention: 1. I don't use WITNESS on my server. 2. I use the 4BSD scheduler, not the ULE scheduler. 3. The last time I synced and built everything was around early May if I remember correctly. -Garrett
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