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by qb45 3497 days ago
Maybe

  perf stat -d php ./benchmark.php
would show some difference? It measures some kernel and CPU events like context switches, page faults, L1 and L3 cache misses.
1 comments

Unfortunately <not supported>

Performance counter stats for 'php56 index.php':

        394.588620      task-clock (msec)         #    0.983 CPUs utilized
               226      context-switches          #    0.573 K/sec
                 2      cpu-migrations            #    0.005 K/sec
            17,447      page-faults               #    0.044 M/sec
   <not supported>      cycles
   <not supported>      stalled-cycles-frontend
   <not supported>      stalled-cycles-backend
   <not supported>      instructions
   <not supported>      branches
   <not supported>      branch-misses
   <not supported>      L1-dcache-loads
   <not supported>      L1-dcache-load-misses
   <not supported>      LLC-loads
   <not supported>      LLC-load-misses

       0.401580145 seconds time elapsed
Working on finding the event descriptors...