codephage2020 commented on PR #7908:
URL: https://github.com/apache/arrow-rs/pull/7908#issuecomment-3067028130
CC @alamb @scovich .
I conducted a simple benchmark test locally.
result:
```
direct_slice_at_offset_zero
time: [1.0067 ns 1.0092 ns 1.0122 ns]
change: [−0.9043% −0.2643% +0.3090%] (p = 0.42 >
0.05)
No change in performance detected.
Found 6 outliers among 100 measurements (6.00%)
4 (4.00%) high mild
2 (2.00%) high severe
branched_slice_at_offset_zero
time: [1.4050 ns 1.4100 ns 1.4157 ns]
change: [−0.3173% +0.0921% +0.4766%] (p = 0.65 >
0.05)
No change in performance detected.
Found 2 outliers among 100 measurements (2.00%)
1 (1.00%) high mild
1 (1.00%) high severe
```
@scovich The results show that you are right. And I will delete the branch
for testing zero.
Below is the code for the benchmark test. Please let me know if there are
any issues. This is a temporary test and I won't submit it.
```rust
const LARGE_DATA_SIZE: usize = 1 << 20;
fn setup_data() -> Vec<u8> {
let mut rng = StdRng::seed_from_u64(42);
(0..LARGE_DATA_SIZE).map(|_| rng.random()).collect()
}
fn bench_simple_direct(c: &mut Criterion) {
let data = setup_data();
let range = 0..1000;
c.bench_function("direct_slice_at_offset_zero", |b| {
b.iter(|| {
let _ = black_box(slice_from_slice_at_offset(&data, 0,
range.clone()));
})
});
}
fn bench_with_branch_zero_offset(c: &mut Criterion) {
let data = setup_data();
let range = 0..1000;
let offset = 0;
c.bench_function("branched_slice_at_offset_zero", |b| {
b.iter(|| {
let _ = black_box(match offset {
0 => slice_from_slice(&data, range.clone()),
_ => slice_from_slice_at_offset(&data, offset,
range.clone()),
});
})
});
}
```
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