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Angela_WilcoxFlag for United States of America

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Why is nmon showing 8 CPU when I have 4 physical CPU and no partitions?

nmon when run on AIX 5.x is showing 8 CPU on a 4 way non partitioned box.  Our 8 way is showing CPU of 16 when viewed with nmon.  Can anyone explain to me why this is?
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sjm_ee
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Is SMT on? Run "smtctl" to see if it is. What do the first 40 or so lines of "prtconf" say?
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dfke

Yes, this is due to the SMT feature of the POWER5 chip, where each CPU (core) runs two processes at the same time.

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Could it also be a result of our 64 bit upgrade - which I did not know we had done??
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dfke

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