c++ compilation perf. comparison (gcc, icc, como) [was: Re: Suggestionsfor improving gcc 3.2 compilation speed?]

[Karel Gardas <kgardas at objectsecurity dot com>]

On Thu, 6 Mar 2003, Kaveh R. Ghazi wrote:

>  > but I
>  > guess my ideal running time would be closer to 10 minutes.  Am I
>  > dreaming? :)
>
> I don't know, how long does your code take to compile with 2.95.3 or
> some other compiler?

I hope you'll not mind when I've used your question to post my own
compilation performance comparison. I've meassured compilation of orb
directory from MICO 2.3.9 (C++ code) where I always used -O0 to get data
which affect development of package (i.e. I guess while developing people
are using -O0). Compared compilers are GCC 3.2.2 and 2.95.4 20011002
(Debian prerelease) (as distributed with Debian GNU/Linux 3.0), Comeau
C/C++ 4.3.0.1 and Intel C++ 7.0.

I have used default Comeau template instatiation mode and so some files
were recompiled before linking to correctly instatiate assigned templates.
Since for development, compiler usually emit its helper files (*.ti, *.ii)
which helps it to correctly instatiate templates during the normal
compilation (I mean first compilation here), I've meassured also
compilation time after deleting only *.o lib* files. - just to know plain
compilation time w/o required prelinking phase. I've also meassured both
plain compilation and compilation with using precompiled-headers. I hope
it'll be clear from report below.

If you would like to compare these results with gcc3.3 and gcc3.4, then
please use my already posted comparison:

http://gcc.gnu.org/ml/gcc/2003-02/msg01530.html

Cheers,

Karel


gcc options: -I../include -O0 -Wall -fpermissive -DPIC -fPIC -c

gcc3.2.2

real    14m34.251s
user    13m26.440s
sys     0m13.360s

gcc2.95.4 20011002 (Debian prerelease)

real    7m15.521s
user    6m29.310s
sys     0m12.950s


como options: -I../include -O0 -a --long_long --implicit_extern_c_type_conversion --diag_suppress=997 -c

como4.3.0.1

real    10m3.988s
user    8m53.540s
sys     0m25.700s

como4.3.0.1 (after rm *.o lib*)

real    7m50.166s
user    6m57.830s
sys     0m19.760s

como4.3.0.1 + PCH

additional pch options used: --pch --pch_dir /home/karel/arch/devel/compile-time/./pch -DFAST_PCH

real    7m21.436s
user    5m46.690s
sys     0m35.680s

como4.3.0.1 + PCH (after rm *.o lib* ../pch/*)

real    5m23.410s
user    4m25.750s
sys     0m26.670s


icc7 options: -I../include -O0 -fPIC -DPIC -c

icc7

real    6m31.781s
user    5m53.810s
sys     0m13.420s

--
Karel Gardas                  kgardas at objectsecurity dot com
ObjectSecurity Ltd.           http://www.objectsecurity.com