Date: Tue, 6 Apr 1999 20:57:04 +0100 From: paul@originative.co.uk To: dillon@apollo.backplane.com, current@FreeBSD.ORG Subject: RE: EGCS optimizations Message-ID: <A6D02246E1ABD2119F5200C0F0303D10FE93@octopus>
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> -----Original Message----- > From: Matthew Dillon [mailto:dillon@apollo.backplane.com] > Sent: 06 April 1999 05:58 > To: current@FreeBSD.ORG > Subject: EGCS optimizations > > .... > Compiling up /usr/src/usr.sbin with egcs and libc compiled with: > > -O2 160 seconds > -O2 -march=pentiumpro 162 seconds > -Os 161 seconds > > Which leads me to believe that using -Os might be beneficial. > If I'm reading that right you timed how long it took to build /usr/src/usr.sbin using egcs and libc compiled with the above optimisations? I doubt that that sort of benchmark is going to say an awful lot about the performance of the optimisation levels since compiling /usr/sr/usr.sbin is going to be affected by disk i/o performance far more than it would be by cpu performance. The relative speed differences of the different egcs/libc binaries is probably smoothed out by the i/o affects which is why the times look so similar. Something that is more cpu bound would be a better benchmark for comparing the optimisation options. Paul. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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