Dave Bayer:
In that paper, they routinely benchmark N-1 cores on an N core Linux
box, because of a noticeable falloff using the last core, which can
do more harm than good. I had confirmed this on my four core Linux
box, but was puzzled that my two core MacBook showed no such
falloff. Hey, two cores isn't representative of many cores, cache
issues yada yada, so I waited.
[..]
Compared to 2 cores, using 3, 4 cores on an equivalent four core box
running OS X gives speedups of
1.45x, 1.9x
As another data point, in our work on Data Parallel Haskell, we ran
benchmarks on an 8-core Xserve (OS X) and an 8-core Sun T2 (Solaris).
On both machines, we had no problem using all 8 cores.
Manuel
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