> -----Original Message----- > From: Matthew Dillon [mailto:dil...@apollo.backplane.com] > Sent: 06 April 1999 05:58 > To: curr...@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 majord...@freebsd.org with "unsubscribe freebsd-current" in the body of the message
