A recent post on the ILUG got me thinking again about the 64 -vs- 32 bit editions of Linux, and so I’m gonna do some more testing.

My last test revealed that on a 64bit AMD box, code compiled with GCC actually suffered a performance degradation when using 32bit integers in 64bit mode.

I’ve got a couple of new AMD64 boxes (both socket 939, and AM2), that currently have 32bit Ubuntu installed, so will have to re-install one of them as a 64bit test bed. I’m hoping to do this very soon, and will update this post with my results accordingly.