decent performance from G4 Macs?
ron_chen_123 at yahoo.com
Sun Apr 14 21:55:13 EDT 2002
--- Mark Hahn <hahn at physics.mcmaster.ca> wrote:
> > --- Mark Hahn <hahn at physics.mcmaster.ca> wrote:
> > > I'm doing some benchmarks to evaluate whether
> > > current Macs would make suitable nodes for a
> > > farm (lots of nodes, preferably fast CPU and
> > > but no serious interconnect.)
> > Physics or bioscience code?
> why does it matter? we're not trying specifically
> to run BLAST,
> if that's what you're asking. I don't see any
> reason why the
> department would matter, but it's a mixture of math,
> physics, astro, biologists, and perhaps a few
> > > I've tried a variety of real codes and
> > > but can't seem to get something like a Mac
> > > with PC133 to perform anywhere close to even a
> > > P4/1.7/i845/PC133.
> > >
> > > I'm using either the gcc 2.95 that comes with
> OSX or
> > > a recent 3.1 snapshot (which is MUCH better, but
> > > still bad).
> > What compiler are you using for the P4?
> I'm pretty happy with recent snapshots of gcc 3.1
> (still mystified why gnu fortran people are stuck at
> F77, but...)
> > > is it just that the performance Apple brags
> about is
> > > strictly in-cache, and/or when doing something
> > > specialized like single-precision SIMD
> > >(altivec/velocity engine)?
> > Apple has some libraries that take advantage of
> > Altivec instructions.
> > AFAIK, there are several people using MacOS X in
> > clusters, the SGE (Sun Grid Engine) project has a
> > for Mac OS X.
> which doesn't give me ANY data on performance.
You can use a better compiler for the PPC:
Also, I did not say that SGE would provide you ANY
data on performance -- all I said was that you could
find people using Mac OS X/G4 machines in the cluster
world. (or if you don't like SGE, you can choose PBS,
they also have a Mac OS X port)
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