On Fri, 25 Jun 2010, it was written: > On Thu, Jun 24, 2010 at 11:50:52AM -0700, Taras Glek wrote: > > We switched gcc4.3 for gcc4.5 and our automated benchmarking > > infrastructure reported 4-19% slowdown on most of our performance > > metrics on 32 and 64bit Linux. > > Could you please also try gcc4.4, so that it is clear if the slowdowns > are between 4.3 and 4.4 or 4.4 and 4.5? Would be nice to narrow the changes > a little bit.
There sure is something in 4.5. I've seen a 1-10% slowdown at the GiNaC (a computer algebra library) benchmark suite after switching from 4.4 to 4.5 on x86_64 when compiling with -O2. And there hasn't been a measurable performance differences between 4.3 and 4.4. -richy. -- Richard B. Kreckel <http://www.ginac.de/~kreckel/>
