Hi Ivan,
When I went to upgrade atlas, I found it claiming it would be compiling for
the G4 architecture (ppc) on a G5 (ppc64) machine, and that it would lead to
inferior performance. I do not recall seeing this on previous
install/upgrades of atlas. Does atlas have support for the G5 architecture?
If it does, what is preventing it from compiling for a G5? Does anyone know
of a workaround? I'm on a G5, obviously, with MacPorts 1.9.2, and gcc 4.4.6.
I wrote a G5 support (ppc64) for Atlas, but it was difficult to debug. At a
certain point in time, somebody pointed out that G5 floating point performance
was not so different from G4, and that 64-bit instructions would fill the cache
more quickly and maybe result in inferior performance. That's why I quit the
ppc64 idea and fused both into a single ppc option. But if somebody is able to
settle the G4/G5 dispute with definitive data about FP computing, I'll be happy
to try to raise the ppc64 options from the deads.
Vincent
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