This command shows you the CPU frequency, like this :

root@lpar1:/root# pmcycles -dm
CPU 0 runs at 3720 MHz
CPU 1 runs at 3720 MHz
CPU 2 runs at 3720 MHz
CPU 3 runs at 3720 MHz
CPU 4 runs at 3720 MHz
The decrementer runs at 512.0 MHz (1.95 ns per tick)

…But this doesn’t display the current speed, while your applications are running.

hopefully there is an undocumented option which does just that : -M

root@lpar1:/root# pmcycles -dMm
CPU 0 runs at 3907 MHz
CPU 1 runs at 3909 MHz
CPU 2 runs at 3909 MHz
CPU 3 runs at 3907 MHz
CPU 4 runs at 3911 MHz
The decrementer runs at 512.0 MHz (1.95 ns per tick)

( FYI , the actual speed here is greater than the theorical speed, because I activated Active Energy Manager with IBM systems director, in the « Favor Performance » mode)

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pmcycles -M shows the actual speed of your CPUs
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