David wrote: >2.2 GHz, Supermicro motherboard, 2Gb DDR, Hyperthreading turned off. > > I have dual xeons 1.8 MHz and 2.4 MHz Currently Linux sees 4 cpus due to hyper threading. What is the reason for turning off hyper threading ? A few days ago I reported a mpirun problem. Is there any connection ? Sasidhar