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The profiling information is collected using the TSC(Time
Stamp Counter) register of Intel Pentium processors. The TSC
is a 64 bit register which is incremented every clock cycle
from 0 at boot time. The RDTSC assmebly instruction is used to
read the counter. The number of clock cycles is directly
proportional to the time elapsed.
Soumyadeb Mitra
2002-08-07