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their FAQ says
. Does top really support multi-processor systems?
On platforms that support multiple processors, top is able to detect
and correctly summarize the information about those processors. What
top does not do is break down the cpu states summary (the third line
of the display) by cpu. Instead it collects the cpu state information
from all processors and combines them in to a single line. Some
vendors include a modified version of top that presents this
information for each cpu. Top 3.7 may have this functionality but it
is not present in the standard top 3.6 release.