Joe Landman wrote: <snip> > Option 1 works today, it simply requires some process adjustment. If > this is possible you should be in good shape. Option 2 may be possible, > but I had some issues with quality of the opteron OSes I played with. > The compiler and library issues on these machines are annoying right > now, but they should be resolved with AMD's help. There are lots of > distro's that "run" on the opteron, though I am not sure if they really > support large memory directly, or if they use the PAE hack. If it is > the latter (the same way to support large memory on Xeon's), it is worth > avoiding. I have tested an opteron's memory with a non-bio code. It is a nuclear model that in one particular problem allocated around 6GB RAM for a single process that ran for 2 days. This model will not run when compiled as a 32-bit executable on any platform, and PAE wouldn't change that. This was with SuSE and I didn't experience any problems with the beta version of the Portland Group compiler on this code. I'm looking forward to getting my own opteron's in the near future. Andrew -- Andrew Shewmaker, Associate Engineer Phone: 1-208-526-1276 Idaho National Eng. and Environmental Lab. P.0. Box 1625, M.S. 3605 Idaho Falls, Idaho 83415-3605