On Fri, Jul 13, 2007 at 06:50:52AM +0200, Roland Mainz wrote: > With "-xO3" it takes ~31 seconds to execute this script. > With "-xc99=%all -xO4 -xalias_level=basic -xdepend" it takes ~39 seconds > to execute this script. > > Erm... the results are somehow upside-down from what I would expect from > these options... ;-(
A typical response to that is that the function inlining that -xO4 turns on makes small programs bigger, and less likely to fit in cache or in a set of cache lines, resulting in memory thrashing and lower performance. I expect that cputrack(1m) would help you figure out if that's happening. Danek _______________________________________________ tools-discuss mailing list [email protected]
