cc-metric-collector/collectors/likwid/groups/phi/VPU_PAIRING.txt

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2021-03-25 14:47:10 +01:00
SHORT VPU pairing ratio
EVENTSET
PMC0 VPU_INSTRUCTIONS_EXECUTED
PMC1 VPU_INSTRUCTIONS_EXECUTED_V_PIPE
METRICS
Runtime (RDTSC) [s] time
V-pipe ratio PMC1/PMC0
Pairing ratio PMC1/(PMC0-PMC1)
LONG
Formulas:
V-pipe ratio = VPU_INSTRUCTIONS_EXECUTED_V_PIPE/VPU_INSTRUCTIONS_EXECUTED
Pairing ratio = VPU_INSTRUCTIONS_EXECUTED_V_PIPE/(VPU_INSTRUCTIONS_EXECUTED-VPU_INSTRUCTIONS_EXECUTED_V_PIPE)
--
This performance group measures the pairing ratio of vector instructions. The
V-pipe can only execute a subset of all instruction, the main workload is done
by the U-pipe. A higher throughput can be achieved if the pairing ratio is
increased.