On Tue, Feb 23, 2010 at 2:35 AM, Fuentes, Adolfo <a.fuen...@liverpool.ac.uk> wrote: > Hello Raju. > > <f95> is a link in "/etc/alternatives" to "/usr/bin/gfortran".
Ok, thanks. > > When typing "gfortran -v" the options are: > > ]$ gfortran -v > Using built-in specs. > Target: i486-linux-gnu > Configured with: ../src/configure -v --with-pkgversion='Debian 4.3.2-1.1' > --with-bugurl=file:///usr/share/doc/gcc-4.3/README.Bugs > --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared > --with-system-zlib --libexecdir=/usr/lib --without-included-gettext > --enable-threads=posix --enable-nls > --with-gxx-include-dir=/usr/include/c++/4.3 --program-suffix=-4.3 > --enable-clocale=gnu --enable-libstdcxx-debug --enable-objc-gc --enable-mpfr > --enable-targets=all --enable-cld --enable-checking=release > --build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu > Thread model: posix > gcc version 4.3.2 (Debian 4.3.2-1.1) > I have gfortran 4.4.1, gcc-4.4.1 on my system and this is what I get. $ gcc -O3 -march=native nbody.gcc-5.c $ time ./a.out 50000000 -0.169075164 -0.169059907 real 0m7.799s user 0m7.796s sys 0m0.004s $ gfortran -O3 -march=native nbody.f90 $ time ./a.out 50000000 -0.169075164 -0.169059907 real 0m10.947s user 0m10.949s sys 0m0.000s It still shows that code compiled with gfortran is a bit slower than the one compiled with gcc. But the ratio is a bit better. gfortran/gcc (for 4.4.1) = 10.947/7.799 = 1.4036 gfortra/gcc (for 4.3.2) = 151.7/77.4 = 1.9599 May be you can upgrade to the latest gfortran version for a little bit improvement in performance. Also, you might get better help at the gfortran mailing list fort...@gcc.gnu.org . It is frequented by gfortran developers who know the ins and outs of the gfortran source. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1d9315cf1002231132g403eb797p25d9b848eb50f...@mail.gmail.com
