[R] 64 bit R slower than 32 bit R on Sun Sparc Solaris?

Roger D. Peng rpeng at jhsph.edu
Wed Sep 8 04:44:54 CEST 2004

Are you using an optimized BLAS for both builds?  That's one possibility.  Also, 
64-bit builds use up more memory initially since the pointers are bigger.  I've 
tried both 64-bit and 32-bit builds on Sparc/Solaris and haven't seen any slowdown.


Jason Liao wrote:

> Hello, everyone! I guess no one is still using R on Sun Sparc these
> days. But our department has a (pretty new) two-CPU Sun server. We
> recently compiled R as a 64 bit application and expected a performance
> boost. But it runs 25-30% slower than the 32 bit version of R. Anyone
> knows why this is so? Thanks!
> Jason
> =====
> Jason Liao, http://www.geocities.com/jg_liao
> Dept. of Biostatistics, http://www2.umdnj.edu/bmtrxweb
> University of Medicine and Dentistry of New Jersey
> phone 732-235-5429, School of Public Health office
> phone 732-235-8611, Cancer Institute of New Jersey office
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