# Arena allocator benchmark

`50_000_000` of 16 byte allocations, `-Ofast`, without sanitizers.

arena-malloc (`realloc` 1.5x of size):

```
$ perf stat -r10 -B ./arena-malloc

 Performance counter stats for './arena-malloc' (10 runs):

            340.31 msec task-clock:u                     #    0.965 CPUs utilized               ( +-  0.77% )
                 0      context-switches:u               #    0.000 /sec
                 0      cpu-migrations:u                 #    0.000 /sec
             6,055      page-faults:u                    #   17.792 K/sec                       ( +-  0.01% )
       255,422,997      cycles:u                         #    0.751 GHz                         ( +-  0.07% )
       700,131,646      instructions:u                   #    2.74  insn per cycle              ( +-  0.00% )
       100,031,363      branches:u                       #  293.938 M/sec                       ( +-  0.00% )
             2,612      branch-misses:u                  #    0.00% of all branches             ( +-  0.97% )

           0.35257 +- 0.00692 seconds time elapsed  ( +-  1.96% )
```

arena-memstream (`open_memstream`, `fwrite`, `fflush`):
```
$ perf stat -r10 -B ./arena-memstream

 Performance counter stats for './arena-memstream' (10 runs):

          3,914.75 msec task-clock:u                     #    0.978 CPUs utilized               ( +-  0.07% )
                 0      context-switches:u               #    0.000 /sec
                 0      cpu-migrations:u                 #    0.000 /sec
            46,927      page-faults:u                    #   11.987 K/sec                       ( +-  0.39% )
     8,395,773,261      cycles:u                         #    2.145 GHz                         ( +-  0.07% )
    14,089,659,266      instructions:u                   #    1.68  insn per cycle              ( +-  0.00% )
     2,871,455,062      branches:u                       #  733.496 M/sec                       ( +-  0.00% )
           447,933      branch-misses:u                  #    0.02% of all branches             ( +- 47.49% )

           4.00461 +- 0.00335 seconds time elapsed  ( +-  0.08% )
```