Effect of huge pages on markbench.ml

gistfile1.txt

$ ./a.out 
setup done
2.705 s/gc
$ sudo hugeadm --pool-pages-min 2M:2000M
$ OCAMLRUNPARAM=H ./a.out 
setup done
2.266 s/gc
$ cat /sys/kernel/mm/transparent_hugepage/enabled 
always [madvise] never
$ perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses ./a.out 
setup done
2.707 s/gc

 Performance counter stats for './a.out':

    10 424 942 964      dTLB-loads                                                  
       182 413 448      dTLB-load-misses          #    1,75% of all dTLB cache hits 
           392 809      iTLB-loads                                                  
           431 128      iTLB-load-misses          #  109,76% of all iTLB cache hits 

      16,935866381 seconds time elapsed

      16,650620000 seconds user
       0,283976000 seconds sys


$ OCAMLRUNPARAM=H perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses ./a.out 
setup done
2.285 s/gc

 Performance counter stats for './a.out':

    10 139 916 431      dTLB-loads                                                  
           820 033      dTLB-load-misses          #    0,01% of all dTLB cache hits 
            18 145      iTLB-loads                                                  
            23 501      iTLB-load-misses          #  129,52% of all iTLB cache hits 

      14,283501553 seconds time elapsed

      14,223073000 seconds user
       0,055996000 seconds sys


$ sudo sh -c 'echo always > /sys/kernel/mm/transparent_hugepage/enabled'
[sudo] Mot de passe de gm : hunter2
$ perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses ./a.out 
setup done
2.461 s/gc

 Performance counter stats for './a.out':

    10 251 055 070      dTLB-loads                                                  
        65 321 060      dTLB-load-misses          #    0,64% of all dTLB cache hits 
            52 002      iTLB-loads                                                  
            78 746      iTLB-load-misses          #  151,43% of all iTLB cache hits 

      15,400264516 seconds time elapsed

      15,293097000 seconds user
       0,103980000 seconds sys


$ sudo sh -c 'echo madvise > /sys/kernel/mm/transparent_hugepage/enabled'
$ MALLOC_CONF="thp:always" LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libjemalloc.so.2 perf stat -e dTLB-loads,dTLB-load-misses,iTLB-loads,iTLB-load-misses ./a.out 
setup done
2.320 s/gc

 Performance counter stats for './a.out':

    10 223 094 920      dTLB-loads                                                  
           178 582      dTLB-load-misses          #    0,00% of all dTLB cache hits 
            31 638      iTLB-loads                                                  
            10 928      iTLB-load-misses          #   34,54% of all iTLB cache hits 

      14,562831544 seconds time elapsed

      14,468974000 seconds user
       0,087981000 seconds sys