AMD® Zen

This page is valid for AMD® Zen.

Available performance monitors for the AMD® Zen microarchitecture

• Fixed-purpose counters
• General-purpose counters
• L3 cache counters

• Power measurement counters

Counters available for each hardware thread

Fixed-purpose counters

The AMD® Zen architecture provides some free-running registers with minimal control that offer some specific events

Counter and events

Counter name	Event name
FIXC0	INSTR_RETIRED_ANY
FIXC1	ACTUAL_CPU_CLOCK or APERF
FIXC2	MAX_CPU_CLOCK or MPERF

Note: It is not recommended to use the fixed counters in metrics as they sometimes do not provide accurate results. Instead of INSTR_RETIRED_ANY please use RETIRED_INSTRUCTIONs for the general-purpose counters

General-purpose counters

Commonly the AMD® Zen microarchitecture provides 4 general-purpose counters consisting of a config and a counter register.

Counter and events

Counter name	Event name
PMC0	*
PMC1	*
PMC2	*
PMC3	*

Available Options

Option	Argument	Description	Comment
edgedetect	N	Set bit 18 in config register
kernel	N	Set bit 17 in config register
threshold	8 bit hex value	Set bits 24-31 in config register
invert	N	Set bit 23 in config register

Counters available for one hardware thread per socket

Power counter

The AMD® Zen microarchitecture provides measurements of the current power consumption through the RAPL interface.

Counter and events

Counter name	Event name
PWR0	PWR_CORE_ENERGY
PWR1	PWR_PKG_ENERGY

Note: AMD Epyc CPUs partly provide zeros or wrong values for the PWR_CORE_ENERGY event

L3 cache counters

The AMD® Zen microarchitecture provides measurements for the last level cache segments.

Counter and events

Counter name	Event name
CPMC0	*
CPMC1	*
CPMC2	*
CPMC3	*
CPMC4	*
CPMC5	*

Available Options

Option	Argument	Description	Comment
tid	8 bit hex value	Set bit 56-63 in config register
match0	4 bit hex value	Set bits 48-51 in config register

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