Laurent GUERBY writes: > On Fri, 2006-02-17 at 22:43 +0000, Joern RENNECKE wrote: > > Has anybody done timings for gcc bootstrap / cross builds and regtests > > with modern multi-core processors? I wonder what a sensible modern > > configuration would be for gcc development, but the the multimedia and > > games benchmarks I found on the web neither seem particularily relevant, > > nor do they paint a uniform picture. > > On a "AMD Athlon(tm) 64 X2 Dual Core Processor 3800+" (2.0 GHz), 2GB of > RAM trunk configured with: > > --enable-languages=c,ada,c++,fortran,java,treelang,objc > --enable-__cxa_atexit > --disable-nls > --enable-threads=posix > --disable-multilib > --enable-checking > > Gives the following timing at -j1: > > === GCCBOOT start === 2006-02-16 22:13:46 > === GCCBOOT configure === 2006-02-16 22:13:46 > === GCCBOOT bootstrap === 2006-02-16 22:13:51 > === GCCBOOT doc === 2006-02-17 01:48:53 > === GCCBOOT check === 2006-02-17 01:48:53 > === GCCBOOT summary === 2006-02-17 04:15:25 > === GCCBOOT install === 2006-02-17 04:15:37 > === GCCBOOT done === 2006-02-17 04:20:03 > > So that's 6h07 total, bootstrap 3h35 and check 2h27. I assume > -j2 could cut bootstrap times by about two, I'm not > sure check is parallel (Ada check isn't for sure). > > On a Pentium III 1GHz, bootstrap is 5h55 and check 5h30 > (on an older version of the tree), so p3/amd64 > > Removing Ada from --enable-languages will also help :).
As a comparison point, I get real 73m39.275s user 113m19.549s sys 15m26.010s for the bootstrap: that's 1h14 elapsed time. That's on a "AMD Athlon(tm) 64 X2 Dual Core Processor 4800+" (2.4 GHz) with make -j3. That's 129min of CPU time in 74min of elapsed time, a pretty good processor utilization ratio of 1.75 : 2. Andrew.
