Hi, all
I use the perfmon2 to count events
"UNHALTED_CORE_CYCLES,UNHALTED_REFERENCE_CYCLES,CPU_CLK_UNHALTED:THREAD_P,CPU_CLK_UNHALTED:REF_P"
and got
CPU0: UNHALTED_CORE_CYCLES 5538707
CPU0: UNHALTED_REFERENCE_CYCLES 3
CPU0: CPU_CLK_UNHALTED:THREAD_P 5641229
CPU0: CPU_CLK_UNHALTED:REF_P 419607
CPU0: UNHALTED_CORE_CYCLES 11661876
CPU0: UNHALTED_REFERENCE_CYCLES 3
CPU0: CPU_CLK_UNHALTED:THREAD_P 11813664
CPU0: CPU_CLK_UNHALTED:REF_P 911248
CPU0: UNHALTED_CORE_CYCLES 15682069
CPU0: UNHALTED_REFERENCE_CYCLES 3
CPU0: CPU_CLK_UNHALTED:THREAD_P 15869779
CPU0: CPU_CLK_UNHALTED:REF_P 1246315
Two questions: 1. why UNHALTED_REFERENCE_CYCLES is 3? Too small
2. why CPU0: CPU_CLK_UNHALTED:REF_P is much smaller than
CPU_CLK_UNHALTED:THREAD_P? this do not make sence!
BTW: I count this for I want to count the CPU Frequency from Intel's DOC:
https://software.intel.com/en-us/articles/measuring-the-average-unhalted-frequency
Average frequency =
TSC_frequency * (CPU_CLK_UNHALTED.THREAD / CPU_CLK_UNHALTED.REF)
So can anybody help on this question?
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