Intel CPUの Performance Monitoring Features を確認する

これより前のプロセッサにおけるPMCの機能はすべてがModel-specificで、異なるモデルで同じものが動作する保証はない

機能セットにはバージョンが振られており、CPUIDにアクセスすることで確認できる

下の場合は Version 4

code:cpuid

sudo apt install cpuid

code:cpuid

❯ cpuid -1 | grep 'Performance Monitoring Features' -A 52

Architecture Performance Monitoring Features (0xa):

version ID = 0x4 (4)

number of counters per logical processor = 0x4 (4)

bit width of counter = 0x30 (48)

length of EBX bit vector = 0x7 (7)

core cycle event = available

instruction retired event = available

reference cycles event = available

last-level cache ref event = available

last-level cache miss event = available

branch inst retired event = available

branch mispred retired event = available

topdown slots event = not available

topdown backend bound = not available

topdown bad speculation = not available

topdown frontend bound = not available

topdown retiring = not available

LBR inserts = not available

fixed counter 0 supported = false

fixed counter 1 supported = false

fixed counter 2 supported = false

fixed counter 3 supported = false

fixed counter 4 supported = false

fixed counter 5 supported = false

fixed counter 6 supported = false

fixed counter 7 supported = false

fixed counter 8 supported = false

fixed counter 9 supported = false

fixed counter 10 supported = false

fixed counter 11 supported = false

fixed counter 12 supported = false

fixed counter 13 supported = false

fixed counter 14 supported = false

fixed counter 15 supported = false

fixed counter 16 supported = false

fixed counter 17 supported = false

fixed counter 18 supported = false

fixed counter 19 supported = false

fixed counter 20 supported = false

fixed counter 21 supported = false

fixed counter 22 supported = false

fixed counter 23 supported = false

fixed counter 24 supported = false

fixed counter 25 supported = false

fixed counter 26 supported = false

fixed counter 27 supported = false

fixed counter 28 supported = false

fixed counter 29 supported = false

fixed counter 30 supported = false

fixed counter 31 supported = false

number of contiguous fixed counters = 0x3 (3)

bit width of fixed counters = 0x30 (48)

anythread deprecation = false