Displaying 2 results from an estimated 2 matches for "2xg5".
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0xg5
2005 Mar 25
0
Does R work in 64 bit on apple G5
On 24/03/2005, at 10:10 PM, David Ruau wrote:
> I am working with R on 2xG5 1.8Ghz from Apple under 10.3.8
> The G5 chip is 64 bits but does R run in 64 bit or 32 under OS X?
> How can know?
> I think it run in 32 bits... but not sure...
>
It is not possible to build and run 64bit apps in MacOS X under 10.3.x.
The problem is not just the compiler. For a wor...
2006 Oct 17
0
[R] performance reflections
...on CRAN also shows the same performance drop.
>
Thanks for the example. I think I have a clarification on this. On a
higher level it's happening in "do_cov", but the underlying issue is
the use of "long double" computations. First the results:
The timings I get (on 2xG5 2.7GHz) are:
gcc3: 0.8s
gcc4: 4.5s (dynamic libgcc)
gcc4: 4.2s (static libgcc)
Basically any calls that use long double will be affected:
qadd: 4.5s (gcc3 opt), 6.7s (Agcc4 opt), 7.4s (gcc3), 7.9s (gcc4 opt
+dyngcc), 10.5s (Agcc4), 10.6s (gcc4 dyngcc)
(this test basically runs 500x 1M long doub...