Re: C++ threads vs. Ada tasks - surprised

["John B. Matthews" <nospam@nospam.invalid>]

In article 
<f02a0d10-acaa-47d3-ade8-2e7bd4030bd8@d4g2000yqa.googlegroups.com>,
 Maciej Sobczak <see.my.homepage@gmail.com> wrote:

[...]
> My expectations were wrong, as the Ada version proved to be ~2x faster
> on my machine (with GNAT 4.4.0 and g++ 4.4.0, taken from the same
> package, both versions compiled with -O2).

FWIW, the version Ada appears to be ~25% faster on Mac OS 10.5.8 with 
gcc 4.3.4.

$ make cleaner run
rm -f *.o *.ali b~* core
rm -f *.s a.out atest ctest
Darwin 9.8.0; gcc 4.3.4
gnatmake atest -cargs -O2 -bargs -shared -largs -dead_strip
gcc -c -O2 atest.adb
gnatbind -shared -x atest.ali
gnatlink atest.ali -shared-libgcc -dead_strip
Darwin 9.8.0; gcc 4.3.4
g++ -O2 ctest.cpp -o ctest
time ./atest 500000
Executed  500000 iterations
        3.48 real         1.97 user         3.33 sys
time ./ctest 500000
Executed 500000 iterations
        4.58 real         2.91 user         5.02 sys

[...]

-- 
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>