[R] Compiling R on an Alpha

Brad McNeney mcneney at cs.sfu.ca
Tue Jun 20 20:02:04 CEST 2000

> Aside: I  am using gcc  as I  have ever done,  because I first  want a
> functional executable.  However,  I have read (in www.alphalinux.org?)
> that substantial improvements on  speed of heavily floating point code
> can be achieved on Alphas by using the Compaq C compiler (available at
> their site). If somebody has some experience with that, I would like to
> hear from him/her.

I've had trouble using R compiled with the C compiler that comes with
Compaq's Tru64 OS (not sure how this compares to the Linux version you
mention above). It seems that during R's garbage collection some variables
that are in use get set to NULL. Don't know why -- maybe a compiler bug?
I'm using gcc now. Too bad since I have some C code that runs about twice
as fast with the DEC/Compaq compiler than with gcc. Although as Thomas has
said a similar improvement might not be expected with R.


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