# Divan first look

I switched benchmarking frameworks to use Divan. I'm glad I started with Criterion, so I get a good idea of what the numbers should be, and also how stable each result should be. It took a while to get the same numbers and stability from Divan, and I don't think I would have made it as good had I not had the experience of Criterion first. Having said that, now that the switch has been made, the `cargo bench` runs much faster and more reliably, the results are easier to read and the code is easier to extend. Overall, I suspect that this will have been worth it.


```rs
wsv                            fastest       │ slowest       │ median        │ mean          │ samples │ iters
╰─ io                                        │               │               │               │         │
   ╰─ benchmarks                             │               │               │               │         │
      ├─ reader_lines_100                    │               │               │               │         │
      │  ├─ First              516.6 µs      │ 5.232 ms      │ 1.088 ms      │ 964.5 µs      │ 1000    │ 1000
      │  ├─ Mealy              400.9 µs      │ 6.252 ms      │ 762.9 µs      │ 707.9 µs      │ 1000    │ 1000
      │  ├─ Moore              692.5 µs      │ 8.977 ms      │ 1.305 ms      │ 1.394 ms      │ 1000    │ 1000
      │  ├─ Nom                449.2 µs      │ 5.779 ms      │ 895.1 µs      │ 913.8 µs      │ 1000    │ 1000
      │  ├─ Split              765.2 µs      │ 10.46 ms      │ 1.567 ms      │ 1.501 ms      │ 1000    │ 1000
      │  ╰─ State              298.2 µs      │ 4.162 ms      │ 522.1 µs      │ 512.1 µs      │ 1000    │ 1000
      ├─ reader_lines_100_000                │               │               │               │         │
      │  ├─ First              612 ms        │ 837.2 ms      │ 622.9 ms      │ 653.8 ms      │ 10      │ 10
      │  ├─ Mealy              489.3 ms      │ 535.5 ms      │ 494.9 ms      │ 499.3 ms      │ 10      │ 10
      │  ├─ Moore              682.2 ms      │ 766 ms        │ 684.3 ms      │ 693.7 ms      │ 10      │ 10
      │  ├─ Nom                412.7 ms      │ 462.5 ms      │ 413.8 ms      │ 420.4 ms      │ 10      │ 10
      │  ├─ Split              730.4 ms      │ 772.2 ms      │ 742.5 ms      │ 744.9 ms      │ 10      │ 10
      │  ╰─ State              310.6 ms      │ 459.7 ms      │ 378.7 ms      │ 383.6 ms      │ 10      │ 10
      ├─ reader_one_big_line                 │               │               │               │         │
      │  ├─ First              437.9 µs      │ 3.586 ms      │ 455.7 µs      │ 612.8 µs      │ 1000    │ 1000
      │  ├─ Mealy              337 µs        │ 1.242 ms      │ 339.7 µs      │ 378.8 µs      │ 1000    │ 1000
      │  ├─ Moore              492.7 µs      │ 2.164 ms      │ 496.4 µs      │ 524.4 µs      │ 1000    │ 1000
      │  ├─ Nom                333.8 µs      │ 994.6 µs      │ 336.4 µs      │ 361.6 µs      │ 1000    │ 1000
      │  ├─ Split              8.163 ms      │ 77.4 ms       │ 8.461 ms      │ 11.29 ms      │ 1000    │ 1000
      │  ╰─ State              226.7 µs      │ 991.1 µs      │ 265.7 µs      │ 314.8 µs      │ 1000    │ 1000
      ├─ string_lines_100                    │               │               │               │         │
      │  ├─ First              547.9 µs      │ 1.721 ms      │ 552.4 µs      │ 605.9 µs      │ 1000    │ 1000
      │  ├─ Mealy              424.5 µs      │ 11.19 ms      │ 631 µs        │ 814.9 µs      │ 1000    │ 1000
      │  ├─ Moore              934.3 µs      │ 5.493 ms      │ 1.252 ms      │ 1.461 ms      │ 1000    │ 1000
      │  ├─ Nom                604.6 µs      │ 4.829 ms      │ 844.9 µs      │ 1.026 ms      │ 1000    │ 1000
      │  ├─ Split              799.7 µs      │ 13.74 ms      │ 1.352 ms      │ 1.695 ms      │ 1000    │ 1000
      │  ╰─ State              451.9 µs      │ 15.22 ms      │ 1.18 ms       │ 1.36 ms       │ 1000    │ 1000
      ├─ string_lines_100_000                │               │               │               │         │
      │  ├─ First              605.1 ms      │ 1.271 s       │ 618.4 ms      │ 759.1 ms      │ 10      │ 10
      │  ├─ Mealy              478.6 ms      │ 588.4 ms      │ 485.7 ms      │ 500.8 ms      │ 10      │ 10
      │  ├─ Moore              678.6 ms      │ 863.8 ms      │ 679.4 ms      │ 698.9 ms      │ 10      │ 10
      │  ├─ Nom                404 ms        │ 428.6 ms      │ 405.1 ms      │ 408.8 ms      │ 10      │ 10
      │  ├─ Split              731.5 ms      │ 787.4 ms      │ 739.4 ms      │ 744 ms        │ 10      │ 10
      │  ╰─ State              276.8 ms      │ 285.5 ms      │ 279.3 ms      │ 280.1 ms      │ 10      │ 10
      ╰─ string_one_big_line                 │               │               │               │         │
         ├─ First              440.4 µs      │ 9.431 ms      │ 444.9 µs      │ 469.6 µs      │ 1000    │ 1000
         ├─ Mealy              337 µs        │ 841.4 µs      │ 341.5 µs      │ 352.9 µs      │ 1000    │ 1000
         ├─ Moore              498.6 µs      │ 3.859 ms      │ 500.9 µs      │ 517.6 µs      │ 1000    │ 1000
         ├─ Nom                333.5 µs      │ 875.8 µs      │ 335.4 µs      │ 347.1 µs      │ 1000    │ 1000
         ├─ Split              8.18 ms       │ 19.2 ms       │ 8.25 ms       │ 8.398 ms      │ 1000    │ 1000
         ╰─ State              204.4 µs      │ 652.6 µs      │ 206.5 µs      │ 218.9 µs      │ 1000    │ 1000
```