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Question:

/proc/cpuinfo shows 8 CPUs, but MOSIX claims that there are only 4

Answer:

There are in fact only 4 real cores per node - the extra cores shown in /proc/cpuinfo reflect Hyper-Threading. You can tell that Hyper-Threading is enabled by the "ht" flag in the "flags" field of /proc/cpuinfo. Hyper-Threading may help some threaded applications, such as browsers, but may slow down compute intensive applications.