System is an AMD Athlon dual core, running Fedora Core 6 64 bit.
At the moment I am running the FAH6 beta version in two separate directories with a different machine number so that each instance is running on a different core. Each instance runs with a high nice value (19) so they have low priority, and the CPU cores are loaded to about 100%.
At the same time I can also run an instance with the SMP option and it seems to run OK - so I am processing 3 WUs simultaneously. If I stop the two processes that are running without smp, the core utilisation drops marginally - about 87% each core.
Obviously there are a finite number of processeor cysles available, so is it more efficient to run one instance with SMP, or two instances with out - one on each core? (Or run 3 instances as I have been)


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