# Multitude Performance Report
Generated by `scripts/perf_report.rs`:
- `cargo bench --bench criterion_alloc` and `criterion_drop` — criterion wall-clock timings.
- `cargo bench --bench gungraun_alloc` and `gungraun_drop` — Callgrind instruction-precise counts.
**Workload:** N = 1000 operations per measurement; slice element count = 8.
Criterion median is reported (default 30 samples, 1 s warm-up, 2 s measurement; override with `--samples` / `--measurement-time` / `--warm-up-time`).
Memory accesses = L1 Hits + LL Hits + RAM Hits (Callgrind D-cache references).
Bench names are aligned between criterion and gungraun via the `GROUPS` table in `scripts/perf_report.rs`.
## `arena_creation`
| `multitude_new` | 37 ns | 316 | 8 | 457 |
| `bumpalo_new` | 1 ns | 16 | 1 | 26 |
## `alloc_u64`
| `alloc` | 6.58 µs | 14,026 | 6 | 21,043 |
| `alloc_with` | 6.62 µs | 14,024 | 9 | 21,040 |
| `alloc_box` | 5.83 µs | 23,043 | 9 | 37,078 |
| `alloc_box_with` | 5.94 µs | 24,043 | 9 | 38,078 |
| `alloc_uninit_box` | 3.10 µs | 20,043 | 9 | 31,078 |
| `alloc_zeroed_box` | 5.58 µs | 21,043 | 9 | 33,078 |
| `alloc_arc` | 9.48 µs | 25,043 | 9 | 40,078 |
| `alloc_arc_with` | 9.78 µs | 26,043 | 8 | 41,078 |
| `alloc_uninit_arc` | 9.26 µs | 22,043 | 9 | 34,078 |
| `alloc_zeroed_arc` | 9.53 µs | 23,043 | 9 | 36,078 |
| `bumpalo_alloc` | 6.57 µs | 19,022 | 6 | 27,037 |
| `bumpalo_alloc_with` | 6.58 µs | 19,020 | 4 | 27,034 |
## `alloc_str`
| `alloc_str` | 8.36 µs | 51,053 | 10 | 76,098 |
| `alloc_str_box` | 12.64 µs | 59,053 | 11 | 85,098 |
| `alloc_str_arc` | 14.00 µs | 58,054 | 11 | 84,099 |
| `bumpalo_alloc_str` | 9.56 µs | 50,048 | 13 | 75,088 |
## `alloc_slice`
| `alloc_slice_copy` | 33.81 µs | 41,049 | 3 | 57,090 |
| `alloc_slice_clone` | 33.49 µs | 45,050 | 10 | 58,091 |
| `alloc_slice_fill_with` | 35.52 µs | 38,026 | 10 | 68,043 |
| `alloc_slice_fill_iter` | 35.82 µs | 38,027 | 9 | 68,044 |
| `alloc_slice_copy_box` | 50.31 µs | 55,624 | 28 | 83,885 |
| `alloc_slice_clone_box` | 49.03 µs | 68,624 | 36 | 92,884 |
| `alloc_slice_fill_with_box` | 51.45 µs | 48,563 | 31 | 86,778 |
| `alloc_slice_fill_iter_box` | 52.38 µs | 50,563 | 34 | 90,778 |
| `alloc_uninit_slice_box` | 46.89 µs | 23,563 | 34 | 36,778 |
| `alloc_zeroed_slice_box` | 48.11 µs | 27,563 | 34 | 43,778 |
| `alloc_slice_copy_arc` | 54.53 µs | 55,625 | 28 | 83,886 |
| `alloc_slice_clone_arc` | 54.06 µs | 61,623 | 36 | 83,883 |
| `alloc_slice_fill_with_arc` | 56.68 µs | 47,563 | 33 | 84,778 |
| `alloc_slice_fill_iter_arc` | 55.84 µs | 48,563 | 32 | 86,778 |
| `alloc_uninit_slice_arc` | 51.35 µs | 23,563 | 34 | 36,778 |
| `alloc_zeroed_slice_arc` | 51.95 µs | 26,563 | 33 | 41,778 |
| `bumpalo_alloc_slice_copy` | 36.94 µs | 38,042 | 7 | 55,076 |
| `bumpalo_alloc_slice_clone` | 36.81 µs | 60,046 | 10 | 74,083 |
| `bumpalo_alloc_slice_fill_with` | 36.03 µs | 40,020 | 5 | 70,033 |
| `bumpalo_alloc_slice_fill_iter` | 37.52 µs | 40,020 | 5 | 70,033 |
## `string_builder`
| `alloc_string` | 8.23 µs | 36,849 | 28 | 51,203 |
| `alloc_string_with_capacity` | 8.09 µs | 37,210 | 20 | 52,325 |
| `bumpalo_string_new_in` | 12.16 µs | 35,843 | 74 | 50,867 |
| `bumpalo_string_with_capacity_in` | 11.79 µs | 34,708 | 30 | 49,159 |
## `vec_builder`
| `alloc_vec` | 1.29 µs | 11,792 | 30 | 17,087 |
| `alloc_vec_with_capacity` | 1.23 µs | 12,139 | 10 | 18,221 |
| `bumpalo_vec_new_in` | 3.89 µs | 12,281 | 61 | 18,888 |
| `bumpalo_vec_with_capacity_in` | 3.63 µs | 11,069 | 2 | 17,116 |
## `drop`
| `box_u64` | 8.05 µs | 10,660 | 68 | 14,433 |
| `rc_u64` | 12.85 µs | 13,005 | 64 | 18,929 |
| `arc_u64` | 12.53 µs | 13,005 | 64 | 18,929 |
| `box_droppy` | 15.19 µs | 186,501 | 86 | 273,127 |
| `rc_droppy` | 15.53 µs | 188,852 | 83 | 277,632 |
| `arc_droppy` | 20.20 µs | 188,852 | 83 | 277,632 |
| `str_box` | 7.50 µs | 10,660 | 68 | 14,433 |
| `str_rc` | 12.30 µs | 13,005 | 70 | 18,929 |
| `str_arc` | 12.13 µs | 13,005 | 70 | 18,929 |
| `slice_box_u64` | 14.68 µs | 11,395 | 68 | 15,498 |
| `slice_rc_u64` | 19.22 µs | 13,390 | 63 | 19,490 |
| `slice_arc_u64` | 19.27 µs | 13,390 | 63 | 19,490 |
| `slice_box_droppy` | 123.93 µs | 1,480,204 | 1,362 | 2,162,703 |
| `slice_rc_droppy` | 122.57 µs | 1,482,204 | 1,107 | 2,166,702 |
| `slice_arc_droppy` | 123.82 µs | 1,482,204 | 1,107 | 2,166,702 |
| `alloc` | 970 ns | 345 | 13 | 514 |
## Multitude vs Bumpalo Head-to-Head
Direct comparisons of multitude versus bumpalo on identical workloads (the multitude variant chosen is the closest semantic equivalent to bumpalo's plain bump-allocation).
| `alloc` vs `bumpalo_alloc` | 6.58 µs | 6.57 µs | +0.2% | 14,026 | 19,022 | -26.3% |
| `alloc_str` vs `bumpalo_alloc_str` | 8.36 µs | 9.56 µs | -12.5% | 51,053 | 50,048 | +2.0% |
| `alloc_slice_copy` vs `bumpalo_alloc_slice_copy` | 33.81 µs | 36.94 µs | -8.5% | 41,049 | 38,042 | +7.9% |
| `alloc_slice_clone` vs `bumpalo_alloc_slice_clone` | 33.49 µs | 36.81 µs | -9.0% | 45,050 | 60,046 | -25.0% |
| `alloc_slice_fill_with` vs `bumpalo_alloc_slice_fill_with` | 35.52 µs | 36.03 µs | -1.4% | 38,026 | 40,020 | -5.0% |
| `alloc_slice_fill_iter` vs `bumpalo_alloc_slice_fill_iter` | 35.82 µs | 37.52 µs | -4.5% | 38,027 | 40,020 | -5.0% |
| `alloc_string` vs `bumpalo_string_new_in` | 8.23 µs | 12.16 µs | -32.3% | 36,849 | 35,843 | +2.8% |
| `alloc_string_with_capacity` vs `bumpalo_string_with_capacity_in` | 8.09 µs | 11.79 µs | -31.3% | 37,210 | 34,708 | +7.2% |
| `alloc_vec` vs `bumpalo_vec_new_in` | 1.29 µs | 3.89 µs | -66.8% | 11,792 | 12,281 | -4.0% |
| `alloc_vec_with_capacity` vs `bumpalo_vec_with_capacity_in` | 1.23 µs | 3.63 µs | -66.1% | 12,139 | 11,069 | +9.7% |