Comparing the Polyhedron 2005 benchmarks from current gcc 4.4 branch (r157587)
with those of gcc trunk (r157600) on x86_64-apple-darwin10 shows significant
regressions in the compile time compared to the previous release. The results
for gcc 4.4 branch are...
================================================================================
Date & Time : 20 Mar 2010 20:47:42
Test Name : gfortran_lin_O3
Compile Command : gfortran -ffast-math -funroll-loops -msse3 -O3 %n.f90 -o %n
Benchmarks : ac aermod air capacita channel doduc fatigue gas_dyn induct
linpk mdbx nf protein rnflow test_fpu tfft
Maximum Times : 2000.0
Target Error % : 0.100
Minimum Repeats : 10
Maximum Repeats : 100
Benchmark Compile Executable Ave Run Number Estim
Name (secs) (bytes) (secs) Repeats Err %
--------- ------- ---------- ------- ------- ------
ac 0.88 10000 11.24 10 0.0070
aermod 36.51 10000 21.49 10 0.0117
air 2.10 10000 5.69 15 0.0463
capacita 1.41 10000 35.28 10 0.0351
channel 0.74 10000 1.75 10 0.0255
doduc 4.31 10000 27.49 10 0.0062
fatigue 1.64 10000 8.45 12 0.0358
gas_dyn 2.38 10000 5.07 14 0.0926
induct 3.46 10000 12.81 10 0.0055
linpk 0.73 10000 15.43 10 0.0633
mdbx 1.39 10000 11.27 10 0.0052
nf 2.99 10000 29.19 16 0.0987
protein 3.42 10000 35.32 10 0.0253
rnflow 4.45 10000 23.38 10 0.0106
test_fpu 4.13 10000 8.74 10 0.0136
tfft 0.45 10000 1.90 10 0.0170
Geometric Mean Execution Time = 11.46 seconds
================================================================================
whereas the results for gcc trunk are...
================================================================================
Date & Time : 20 Mar 2010 22:44:44
Test Name : gfortran_lin_O3
Compile Command : gfortran -ffast-math -funroll-loops -msse3 -O3 %n.f90 -o %n
Benchmarks : ac aermod air capacita channel doduc fatigue gas_dyn induct
linpk mdbx nf protein rnflow test_fpu tfft
Maximum Times : 2000.0
Target Error % : 0.100
Minimum Repeats : 10
Maximum Repeats : 100
Benchmark Compile Executable Ave Run Number Estim
Name (secs) (bytes) (secs) Repeats Err %
--------- ------- ---------- ------- ------- ------
ac 1.84 10000 10.59 10 0.0061
aermod 60.90 10000 20.96 10 0.0076
air 4.13 10000 5.68 10 0.0880
capacita 2.76 10000 33.16 10 0.0113
channel 0.98 10000 1.83 12 0.0089
doduc 8.23 10000 27.75 10 0.0085
fatigue 3.09 10000 8.05 10 0.0934
gas_dyn 5.39 10000 4.38 15 0.0621
induct 6.96 10000 12.65 10 0.0073
linpk 1.03 10000 15.40 10 0.0651
mdbx 2.41 10000 11.33 10 0.0059
nf 3.38 10000 27.76 13 0.0973
protein 7.79 10000 37.02 10 0.0041
rnflow 9.70 10000 23.64 10 0.0224
test_fpu 7.25 10000 8.67 12 0.0331
tfft 0.75 10000 1.88 10 0.0514
Geometric Mean Execution Time = 11.25 seconds
================================================================================
The compile times have almost doubled which seem excessive for the optimization
improvements obtained.
--
Summary: large compile time regressions for Polyhedron 2005
benchmarks
Product: gcc
Version: 4.5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: howarth at nitro dot med dot uc dot edu
GCC build triplet: x86_64-apple-darwin10
GCC host triplet: x86_64-apple-darwin10
GCC target triplet: x86_64-apple-darwin10
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43463
