64 bit R for Windows
Martin Maechler <maechler at stat.math.ethz.ch> writes:
"PD" == Peter Dalgaard <p.dalgaard at biostat.ku.dk>
on 02 Sep 2005 18:48:24 +0200 writes:
PD> "Milton Lopez" <mlopez at iattc.org> writes:
>> I appreciate the update. We will consider using Linux,
>> which leads me to one more question: what is the maximum
>> RAM that R can use on each platform (Linux and Windows)?
>>
>> Thanks again for your prompt responses.
PD> On Win32, something like 3GB. Maybe a little more on
PD> Linux32, but there's a physical limit at 4GB.
for a *single* object, yes. However (and Peter knows this
probably better than me ..), R's workspace can be very much
larger which makes it realistically possible to start *using* R
functions on objects of around 4GB.
Notice that I said "Linux32" there.... The single-object size limit is of course relevant on 64 bit systems, so thanks for the reminder. <snip>
PD> On Linux 64, the motherboards set the limit in practice,
PD> 32GB systems have been reported working and I think at
PD> least 64GB should be possible. I seem to recall that the
PD> maximum _virtual_ memory is not quite 2^64, but it will
PD> be pretty huge (2^48, 256TB)?.
O__ ---- Peter Dalgaard ?ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907