[R-SIG-Mac] R.app or R64.app?

[Simon Urbanek]

On Mar 13, 2010, at 1:37 PM, Ivan Calandra wrote:

> Simon,
> 
> I never thought that this issue would be so complicated!
> So if I understand well, I should try both and see which one is better for my use. Am I right?
> 

If you have a machine with more than 4GB of RAM, go with 64-bit. If you don't, either will be probably equally fine for you so it doesn't matter but 32-bit is the more tested one so I'd go for that. The differences in speed are not that big, either.

Cheers,
Simon



> But as I said, except for a few specific tasks, speed should not be a problem for me.
> 
> Thanks again for your detailed answers.
> Ivan
> 
> 
> Le 13 mars 2010 à 18:37, Simon Urbanek a écrit :
> 
>> Ivan,
>> 
>> On Mar 13, 2010, at 7:04 AM, Ivan Calandra wrote:
>> 
>>> Dear Mac Users,
>>> 
>>> New on R Mac (MacOS X 10.6), I've used up to now R.app [R.app GUI 1.31 (5537) i386-apple-darwin9.8.0]. 
>>> But I've tried R64 [R.app GUI 1.31 (5537) x86_64-apple-darwin9.8.0] and it also works.
>>> 
>>> If both work, which one should I use? Is there any difference in terms of speed for example (which would not be really critical for me since I don't really handle large datasets) or anything else.
>>> 
>> 
>> There is no clear answer to that. In general, using 32-bit R is a bit safer because not all packages support 64-bit. The main advantage of 64-bit is that you can use more memory (>4GB). Historically, 64-bit R was used only on machines a lot of RAM. As of speed, on the one hand 64-bit instruction set is faster as it can take advantage of new features, but on the other hand it uses twice as much memory for pointers which is slows it down. I have posted some info on the list here a while ago
>> http://www.mail-archive.com/r-sig-mac@stat.math.ethz.ch/msg04244.html
>> there is no clear winner - there are tasks where one is faster than the other either way.
>> 
>> In OS X 10.6 all applications are now by default 64-bit so in fact the command line R is 64-bit so Apple's suggestion is to use the R64.app in Snow Leopard -- but it's more about technology than real benefits I think...
>> 
>> Cheers,
>> Simon
>> 
>> 
> 
> 
> 
> --
> Ivan CALANDRA
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> University of Hamburg
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> ivan.calandra at uni-hamburg.de
> 
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