Date: Tue, 24 Feb 2004 17:36:55 -0500 From: John Baldwin <jhb@FreeBSD.org> To: amd64@FreeBSD.org Cc: "'freebsd-amd64@FreeBSD.org'" <freebsd-amd64@freebsd.org> Subject: Re: Performance comparison, ULE vs 4BSD and AMD64 vs i386 Message-ID: <200402241736.55911.jhb@FreeBSD.org> In-Reply-To: <403BCA6B.2050908@thejemreport.com> References: <1077658664.92943.15.camel@.rochester.rr.com> <20040224215847.GC6356@Odin.AC.HMC.Edu> <403BCA6B.2050908@thejemreport.com>
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On Tuesday 24 February 2004 05:04 pm, Jem Matzan wrote: > Brooks Davis wrote: > >On Tue, Feb 24, 2004 at 04:37:44PM -0500, Jem Matzan wrote: > >>How about AMD64 being slower than i386 on the same hardware? By > >>slower, I mean a buildworld -j4 took about 400 seconds longer in AMD64 > >>mode. > > > >You can't usefully compare compile times when you are compiling for > >a different instructions set. The work involved is rairly the same > >so the results are meaning less. If you could factor out the cost of > >building the native bootstrap tools since that isn't the same job on > >each machine, the speed of a cross buildworld would be an intresting > >test. For comparing i386 and amd64, I'd probably build an alpha or > >sparc64 world so the target would be entierly different. > > > >-- Brooks > > I figured that the world would be the same for both AMD64 and i386. That > really sucks that all of this data and all of that time has been more or > less wasted on doing buildworld time benchmarks. As far as I know it > isn't possible to do a crossbuild (I've tried before, and I read on the > list several weeks ago that it won't work). Do you have any suggestions > for measuring compile times? You can do a crossbuild easy, just do: make TARGET_ARCH=amd64 buildworld or subsitute whatever arch for amd64. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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