Benchmark núcleos individuais? [duplicado]

Question

Como posso comparar núcleos individuais? Eu quero ver se eles estão todos operando na mesma velocidade. Estou um pouco confuso se o meu dispositivo Cortex A53 tiver big.LITTLE ou não, estou lendo informações conflitantes na internet, então eu quero testá-lo sozinho.

    

Answer 1

Acho que esse comentário de @ doug-smythies responde à pergunta.

No entanto, percebi apenas para ver se todas as CPUs estavam executando no mesmo nível - eu poderia fazer isso:

1 CPU

root@amlogic:~# stress-ng --cpu 1 --cpu-method matrixprod  --metrics-brief --perf -t 10
stress-ng: info:  [5921] dispatching hogs: 1 cpu
stress-ng: info:  [5921] cache allocate: using built-in defaults as unable to determine cache details
stress-ng: info:  [5921] cache allocate: default cache size: 2048K
stress-ng: info:  [5921] successful run completed in 10.94s
stress-ng: info:  [5921] stressor      bogo ops real time  usr time  sys time   bogo ops/s   bogo ops/s
stress-ng: info:  [5921]                          (secs)    (secs)    (secs)   (real time) (usr+sys time)
stress-ng: info:  [5921] cpu                 21     10.93     10.02      0.02         1.92         2.09
stress-ng: info:  [5921] cpu:
stress-ng: info:  [5921]             14,108,856,703 CPU Cycles                     1.29 B/sec
stress-ng: info:  [5921]             13,710,373,770 Instructions                   1.25 B/sec (0.972 instr. per cycle)
stress-ng: info:  [5921]                927,478,656 Cache References              84.76 M/sec
stress-ng: info:  [5921]                 43,400,148 Cache Misses                   3.97 M/sec ( 4.68%)
stress-ng: info:  [5921]                 36,225,340 Branch Misses                  3.31 M/sec ( 0.00%)

4 CPU

root@amlogic:~# stress-ng --cpu 4 --cpu-method matrixprod  --metrics-brief --perf -t 10
stress-ng: info:  [5867] dispatching hogs: 4 cpu
stress-ng: info:  [5867] cache allocate: using built-in defaults as unable to determine cache details
stress-ng: info:  [5867] cache allocate: default cache size: 2048K
stress-ng: info:  [5867] successful run completed in 11.56s
stress-ng: info:  [5867] stressor      bogo ops real time  usr time  sys time   bogo ops/s   bogo ops/s
stress-ng: info:  [5867]                          (secs)    (secs)    (secs)   (real time) (usr+sys time)
stress-ng: info:  [5867] cpu                 51     10.80     41.05      0.47         4.72         1.23
stress-ng: info:  [5867] cpu:
stress-ng: info:  [5867]             59,953,532,588 CPU Cycles                     5.19 B/sec
stress-ng: info:  [5867]             31,357,210,848 Instructions                   2.71 B/sec (0.523 instr. per cycle)
stress-ng: info:  [5867]              2,127,678,244 Cache References               0.18 B/sec
stress-ng: info:  [5867]                101,073,952 Cache Misses                   8.75 M/sec ( 4.75%)
stress-ng: info:  [5867]                 82,805,524 Branch Misses                  7.17 M/sec ( 0.00%)

8 CPU

root@amlogic:~# stress-ng --cpu 8 --cpu-method matrixprod  --metrics-brief --perf -t 10
stress-ng: info:  [5892] dispatching hogs: 8 cpu
stress-ng: info:  [5892] cache allocate: using built-in defaults as unable to determine cache details
stress-ng: info:  [5892] cache allocate: default cache size: 2048K
stress-ng: info:  [5892] successful run completed in 11.53s
stress-ng: info:  [5892] stressor      bogo ops real time  usr time  sys time   bogo ops/s   bogo ops/s
stress-ng: info:  [5892]                          (secs)    (secs)    (secs)   (real time) (usr+sys time)
stress-ng: info:  [5892] cpu                126     10.50     81.49      0.58        12.00         1.54
stress-ng: info:  [5892] cpu:
stress-ng: info:  [5892]            118,145,351,216 CPU Cycles                    10.24 B/sec
stress-ng: info:  [5892]             94,066,812,704 Instructions                   8.16 B/sec (0.796 instr. per cycle)
stress-ng: info:  [5892]              6,383,299,240 Cache References               0.55 B/sec
stress-ng: info:  [5892]                304,757,784 Cache Misses                  26.43 M/sec ( 4.77%)
stress-ng: info:  [5892]                248,569,352 Branch Misses                 21.55 M/sec ( 0.00%)

    

Answer 2

(Eu estou supondo que você tenha um cpu com múltiplos núcleos, cada um com vários threads)

Você pode usar uma ferramenta chamada sysbench.

Instale-o com sudo apt-get install sysbench

Por padrão, isso está testando um único thread.

sysbench --test=cpu run

ou

sysbench --test=threads --num-threads=1 --thread-locks=1 run

Mas não consigo descobrir como bloqueá-lo para um segmento específico. Alguém?

Você mesmo pode tentar lendo as páginas man:

man sysbench