[ Added gcc@gcc.gnu.org to the CC list and included Dominique's mail in full, as the problem might well be in the common code. ]
Quoting Dominique Dhumieres <[EMAIL PROTECTED]>: > I have the following timing for the compilation of the polyhedron tests > on a 1.8Ghz G5 with: > > gfortran -w -O3 -ftree-loop-linear -ffast-math -funroll-loops > > for the following snapshots patched with the Paul Thomas' optimization of > dot_product. > > snapshot 12/24 12/31 01/07 01/14 > > ac 5.8s 6.0s 24.7s 23.0s + > aermod 223.9s 227.3s 485.8s 467.6s + > air 21.0s 21.6s 8.2s 8.0s - > capacita 4.6s 4.7s 5.8s 5.6s > channel 2.5s 2.5s 17.6s 17.7s + > doduc 19.7s 20.0s 38.6s 37.0s + > fatigue 15.0s 15.4s 7.2s 6.8s - > gas_dyn 8.6s 8.8s 19.6s 18.5s + > induct 28.1s 28.7s 66.1s 61.6s + > kepler 0.6s 0.6s 1.1s 1.0s + > linpk 1.4s 1.4s 1.4s 1.4s > mdbx 5.3s 5.4s 6.9s 6.5s > nf 3.6s 3.6s 4.4s 4.3s > protein 15.5s 15.9s 15.9s 14.5s > rnflow 11.4s 11.6s 12.6s 12.7s > test_fpu 8.4s 8.5s 8.8s 8.5s > tfft 1.3s 1.3s 1.8s 1.7s > > I only noticed it today, but there has been a noticable change in the > compilation time between the 20051231 and 20060107 snapshots: > air.f90 and fatigue.f90 compile twice faster, but aermode.f90, > doduc.f90, gas_dyn.f90, induct.f90, and kepler.f90 compile twice slower, > while ac.f90 takes four more time and channel.f90 takes seven more time. > > Am I the only one to see that? If not, does any one has any idea of what > caused this slow down in compilation? > > Using the François-Xavier's builds I have narrowed the problem between the > 05/01 and the 06/01: > > [scala] gfortran/2006> time irun/bin/gfortran -v -O3 -ffast-math > -funroll-loops induct.f90 > ... > GNU F95 version 4.2.0 20060105 (experimental) (x86_64-unknown-linux-gnu) > ... > 19.375u 0.250s 0:20.39 96.2% 0+0k 0+0io 0pf+0w > > [scala] gfortran/2006> time irun/bin/gfortran -v -O3 -ffast-math > -funroll-loops induct.f90 > ... > GNU F95 version 4.2.0 20060106 (experimental) (x86_64-unknown-linux-gnu) > ... > 33.865u 0.362s 0:35.09 97.5% 0+0k 0+0io 0pf+0w > > TIA > > Dominique > > On the induct.f90 test I get with the latest snapshot: > > options compile exec > > -O3 -ftree-loop-linear -ffast-math -funroll-loops 62.7 66.7 > -O3 -ffast-math -funroll-loops 61.0 66.6 > -O3 -ffast-math 59.5 72.0 > -O3 -funroll-loops 60.1 81.1 > -O3 59.5 81.4 > -O2 -ffast-math -funroll-loops 60.1 67.0 > -O2 -ffast-math 54.3 154.5 > -O2 -funroll-loops 58.7 81.0 > -O2 55.2 112.3 > -O1 -ffast-math -funroll-loops 14.6 80.5 > -O1 -ffast-math 12.6 160.3 > -O1 -funroll-loops 14.4 105.7 > -O1 12.7 164.4 > -O0 -ffast-math -funroll-loops 3.3 638.0 > -O0 3.4 634.4 Are you building with --enable-checking (the default)? Can you try compiling some of the most-affected files with -ftime-report, so that we can see where the slowdown occured? - Tobi
