Hi Edward,
Is it worth having a 64-bit x86 version?
Does relax need to access more than 4 GB of RAM per process/thread? I think that's still the main deciding factor in the 32/64-bit choice. Apple claims that 64-bit apps can see a 5-15% performance increase depending on workload due to the extra general purpose CPU registers available in 64-bit mode. *shrug* Among my user population, we have very few PPC users left. The stats from our ~425 OS X users in March: https://developer.sbgrid.org/~bene/consortium-stats/four.html https://developer.sbgrid.org/~bene/consortium-stats/five.html Given the current difficulties, my suggestion would be to simplify, simplify, simplify. :-) Once you have a stable package that is working for the most common platforms, i.e. OS X Intel 10.6/7, then add more options as necessary to satisfy the corner cases. As an aside, the linux packages work great on every distro I've tested: Red Hat/CentOS 5 and 6, Ubuntu 10.10 and 11.10, Debian 6, 32 and 64-bit for all of them. -ben -- | Ben Eisenbraun | SBGrid Consortium | http://sbgrid.org | | Harvard Medical School | http://hms.harvard.edu |