AIXThis forum is for the discussion of IBM AIX.
eserver and other IBM related questions are also on topic.
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I don't know how things work on Linux, because I only work with AIX where the situation would be the following:
0.8 processing units (the computational power or processing time, so to speak) are divided between 4 virtual CPUs (each has a computational power of 0.2 CPU). Furthermore, the Power5 and Power6 CPUs support 2-way simultaneous multi-threading which means parallel execution of two threads per (virtual) CPU thus creating another level of processor abstraction - the logical CPU. In our case we would have 8 logical CPUs.
In AIX the simultaneous multi-threading (SMT) is controlled by smtctl command, in RHEL the SMT can also be controlled, but requires installation of powerpc-utils (so I've read).
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