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RE: [off-topic] Intel's C/C++ compiler ...


Mikael Adlers writes:
 > there can be an great difference between compilers, for example
 > I got a speedup of 1.5 when switching from lcc to MS Visual C++
 > (sparse QR routine for matlab), so I think the article may be valid. 
 > However, they could have stated what compiler flags they where using!

I think you are too kind to them.  The article is completely bogus in
my opinion.  I don't think they even tried do a good benchmark.

As you can read on their site the people behind the magazine are
actually a marketing company, and are owned by Andover(Slashdot) so
their lack of standards is not a surprise to me.

As for the compiler efficiency my experience is that the variation due
to different options settings on a given compiler is often far greater
than between compilers.  So the most important thing to alwys know the
various compilers options well, in particular the -f and -m otions on
gcc, and to profile the code thoroughly with gprof to identify the
bottlenecks.

Brian



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