R as 64 bit application
On Thu, 15 May 2003, Thomas Lumley wrote:
On Thu, 15 May 2003, Paul Gilbert wrote:
In a package test I have a problem that needs over 4G of memory. This requires that I use R compiled as a 64 bit application. Is there a way within R to test if R has been compile as a 64 bit application? This would allow me to automatically skip the test when I know it is going to fail.
I don't think so. You could use a simple C function
void is64bit (int *sizeptr){
*sizeptr = sizeof sizeptr ==8;
return;
}
is64bit<-function(){
.C("is64bit",logical(1))[[1]]
}
You could call object.size:
object.size(numeric(0)) #32-bit
[1] 28
object.size(numeric(0)) #64-bit
[1] 56 or you could look at the results of gc():
foo <- gc() foo[1,4]/foo[1,3]*2^20
[1] 56.05374 and it's about 28 on a 32-bit system.
Brian D. Ripley, ripley at stats.ox.ac.uk Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/ University of Oxford, Tel: +44 1865 272861 (self) 1 South Parks Road, +44 1865 272866 (PA) Oxford OX1 3TG, UK Fax: +44 1865 272595