Date: Wed, 14 Mar 2001 15:12:41 -0800 From: Alex Zepeda <jazepeda@pacbell.net> To: hackers@FreeBSD.ORG Subject: Re: optimizing apache with php and nfs mounts Message-ID: <20010314151241.B62712@zippy.mybox.zip> In-Reply-To: <20010314025840.A93046@dragon.nuxi.com>; from TrimYourCc@NUXI.com on Wed, Mar 14, 2001 at 02:58:40AM -0800 References: <Pine.BSO.4.21.0103121542460.23058-100000@gandalf.bravenet.com> <Pine.BSF.4.33.0103122226150.60221-100000@sdmail0.sd.bmarts.com> <20010313074140.B75117@dragon.nuxi.com> <20010313122053.A1339@zippy.mybox.zip> <20010313125119.X29888@fw.wintelcom.net> <20010314011931.D549@zippy.mybox.zip> <20010314025840.A93046@dragon.nuxi.com>
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On Wed, Mar 14, 2001 at 02:58:40AM -0800, David O'Brien wrote: > I won't even to there... Well, the only reason I mentioned it.. was that the pgcc folks don't seem to be too delusioned about the dangers. -ON (N > 2) is regarded as at least possibly in danger of generating incorrect code. > Not untested -- but you should go grab a graduate text on compiler > optimizations and familiarize yourself with the complexity of the problem. Care to recommend any starting places. You've piqued my interest. > If hello_world.c showed a problem with an optimization, I guarantee it > would be fixed. Of course depending on the problem. > The current test case of holding up the entire FreeBSD > kernel as showing an optimization problem doesn't cut it. If you care to > trim it down to a single module showing the problem.... Well I've just made buildworld with CFLAGS = "-O2 -march=pentiumpro -malign-double" from a world built with the same flags. Not so sure of any performance impact however. - alex To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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