Em Thu, Feb 16, 2023 at 10:10:05AM -0800, Ian Rogers escreveu: > On Wed, Feb 15, 2023 at 10:12 PM Athira Rajeev > <atraj...@linux.vnet.ibm.com> wrote: > > > > Power10 Performance Monitoring Unit (PMU) provides events > > to understand stall cycles of different pipeline stages. > > These events along with completed instructions provides > > useful metrics for application tuning. > > > > Patch implements the json changes to collect counter statistics > > to present the high level CPI stall breakdown metrics. New metric > > group is named as "CPI_STALL_RATIO" and this new metric group > > presents these stall metrics: > > - DISPATCHED_CPI ( Dispatch stall cycles per insn ) > > - ISSUE_STALL_CPI ( Issue stall cycles per insn ) > > - EXECUTION_STALL_CPI ( Execution stall cycles per insn ) > > - COMPLETION_STALL_CPI ( Completition stall cycles per insn ) > > > > To avoid multipling of events, PM_RUN_INST_CMPL event has been > > modified to use PMC5(performance monitoring counter5) instead > > of PMC4. This change is needed, since completion stall event > > is using PMC4. > > > > Usage example: > > > > ./perf stat --metric-no-group -M CPI_STALL_RATIO <workload> > > > > Performance counter stats for 'workload': > > > > 63,056,817,982 PM_CMPL_STALL # 0.28 > > COMPLETION_STALL_CPI > > 1,743,988,038,896 PM_ISSUE_STALL # 7.73 > > ISSUE_STALL_CPI > > 225,597,495,030 PM_RUN_INST_CMPL # 6.18 > > DISPATCHED_CPI > > # 37.48 > > EXECUTION_STALL_CPI > > 1,393,916,546,654 PM_DISP_STALL_CYC > > 8,455,376,836,463 PM_EXEC_STALL > > > > "--metric-no-group" is used for forcing PM_RUN_INST_CMPL to be scheduled > > in all group for more accuracy. > > > > Signed-off-by: Athira Rajeev <atraj...@linux.vnet.ibm.com> > > Acked-by: Ian Rogers <irog...@google.com>
Thanks, applied. - Arnaldo
