Another question some of you may help me make decisions on. I've been doing some reading that indicates that having HT turned on in this dual xeon machine might actually slow down the computing process rather than speeding it up. I rebooted this a.m., and turned HT off, just prior to my main application run. One thing that might be of note, this application is using OMP for utilizing both cpu's, and prior to turning off HT, I had been running the software using 2 cpu's of the 4 that the OS sees. I'm waiting on a model run to finish to see if there is any appreciable difference, but the one thing I do notice right off is cpu utilization is running close to 100% on both, where before, it averaged maybe 50% or thereabouts. Again, sar is showing at last count, 83.56% utilization for user, 10.27% system and only 0.02% nice. Idle was 5.74%. I'm attempting to squeeze every last bit of processing power out of this machine, and would entertain suggestions on tuning if there happen to be any types of tuning that would help. Sam -- Sam W.Drinkard -- sam at wa4phy.net http://wa4phy.net Augusta Area Mesonet cell 706.825.8513 Home 706.868.7253 MAIL 4428 Branchwood Drive, Martinez Georgia, 30907-1304