我正在使用AMD Ryzen 5 1600 CPU,希望使用Perf来测量程序的缓存未命中。当我运行perf stat -e cache-misses ./program
时,Perf总是报告0个缓存未命中。运行perf list
会得到以下输出:
amd_iommu_0/cmd_processed/ [Kernel PMU event]
amd_iommu_0/cmd_processed_inv/ [Kernel PMU event]
amd_iommu_0/ign_rd_wr_mmio_1ff8h/ [Kernel PMU event]
amd_iommu_0/int_dte_hit/ [Kernel PMU event]
amd_iommu_0/int_dte_mis/ [Kernel PMU event]
amd_iommu_0/mem_dte_hit/ [Kernel PMU event]
amd_iommu_0/mem_dte_mis/ [Kernel PMU event]
amd_iommu_0/mem_iommu_tlb_pde_hit/ [Kernel PMU event]
amd_iommu_0/mem_iommu_tlb_pde_mis/ [Kernel PMU event]
amd_iommu_0/mem_iommu_tlb_pte_hit/ [Kernel PMU event]
amd_iommu_0/mem_iommu_tlb_pte_mis/ [Kernel PMU event]
amd_iommu_0/mem_pass_excl/ [Kernel PMU event]
amd_iommu_0/mem_pass_pretrans/ [Kernel PMU event]
amd_iommu_0/mem_pass_untrans/ [Kernel PMU event]
amd_iommu_0/mem_target_abort/ [Kernel PMU event]
amd_iommu_0/mem_trans_total/ [Kernel PMU event]
amd_iommu_0/page_tbl_read_gst/ [Kernel PMU event]
amd_iommu_0/page_tbl_read_nst/ [Kernel PMU event]
amd_iommu_0/page_tbl_read_tot/ [Kernel PMU event]
amd_iommu_0/smi_blk/ [Kernel PMU event]
amd_iommu_0/smi_recv/ [Kernel PMU event]
amd_iommu_0/tlb_inv/ [Kernel PMU event]
amd_iommu_0/vapic_int_guest/ [Kernel PMU event]
amd_iommu_0/vapic_int_non_guest/ [Kernel PMU event]
branch-instructions OR cpu/branch-instructions/ [Kernel PMU event]
branch-misses OR cpu/branch-misses/ [Kernel PMU event]
cache-misses OR cpu/cache-misses/ [Kernel PMU event]
cache-references OR cpu/cache-references/ [Kernel PMU event]
cpu-cycles OR cpu/cpu-cycles/ [Kernel PMU event]
instructions OR cpu/instructions/ [Kernel PMU event]
msr/aperf/ [Kernel PMU event]
msr/irperf/ [Kernel PMU event]
msr/mperf/ [Kernel PMU event]
msr/tsc/ [Kernel PMU event]
stalled-cycles-backend OR cpu/stalled-cycles-backend/ [Kernel PMU event]
stalled-cycles-frontend OR cpu/stalled-cycles-frontend/ [Kernel PMU event]
rNNN [Raw hardware event descriptor]
cpu/t1=v1[,t2=v2,t3 ...]/modifier [Raw hardware event descriptor]
(see 'man perf-list' on how to encode it)
mem:<addr>[/len][:access] [Hardware breakpoint]
运行
sudo perf list
会列出比上面的更多事件。我不确定为什么cache-misses
无法工作,因为像branch-misses
这样的事件是可以工作的。也许我必须使用其中一个amd_iommu_0
事件(amd_iommu_0/mem_dte_mis/
看起来很有前途,但我不确定它测量的是什么)?是否有任何参考资料可以解释这些事件是什么?
sudo
显示了更多的事件,你可以设置perf_event_paranoid
,这样你就不需要一直使用perf
。perf_event_paranoid == 1
对 x86 perf 实际上有什么限制? - Peter Cordes