相关疑难解决方法(0)

当我运行时，perf list我看到一堆Hardware Cache Events，如下所示：

$ perf list | grep 'cache event'
  L1-dcache-load-misses                              [Hardware cache event]
  L1-dcache-loads                                    [Hardware cache event]
  L1-dcache-stores                                   [Hardware cache event]
  L1-icache-load-misses                              [Hardware cache event]
  LLC-load-misses                                    [Hardware cache event]
  LLC-loads                                          [Hardware cache event]
  LLC-store-misses                                   [Hardware cache event]
  LLC-stores                                         [Hardware cache event]
  branch-load-misses                                 [Hardware cache event]
  branch-loads                                       [Hardware cache event]
  dTLB-load-misses                                   [Hardware cache event]
  dTLB-loads                                         [Hardware cache event]
  dTLB-store-misses                                  [Hardware cache event]
  dTLB-stores                                        [Hardware cache event]
  iTLB-load-misses                                   [Hardware cache event]
  iTLB-loads                                         [Hardware cache event]
  node-load-misses …

我有一个测试用例来观察iTLB负载,iTLB负载未命中

perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses -p 22479

并得到输出:

进程ID"22479"的性能计数器统计信息:

     1,262,817      dTLB-loads                                                  
        13,950      dTLB-load-misses          #    1.10% of all dTLB cache hits 
            75      iTLB-loads                                                  
         6,882      iTLB-load-misses          # 9176.00% of all iTLB cache hits 

   3.999720948 seconds time elapsed

我不知道如何解释iTLB负载仅75但iTLB负载未命中6,882？

lscpu showes:Intel(R)Xeon(R)CPU E5-2620 v4 @ 2.10GHz

编辑:

我可以解释如下:

做(75 + 6882)次iTLB负载,有75次点击但6882次未命中？

编辑:

ocperf.py list | wc -l
Downloading https://download.01.org/perfmon/mapfile.csv to mapfile.csv

Traceback (most recent call last):
File "/home/marschen/tools/pmu-tools-master/ocperf.py", line 1012, in <module>
emap = find_emap()
File "/home/marschen/tools/pmu-tools-master/ocperf.py", line 831, in find_emap
event_download.download(el, toget)
File …