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# 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% )
```
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