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resources/page: Use binary search in Pages.Prev/Next if possible

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This is obviously much faster for lager data sets:

```bash
name                         old time/op    new time/op    delta
SearchPage/ByWeight-100-4       267ns ± 4%     272ns ± 5%     ~     (p=0.457 n=4+4)
SearchPage/ByWeight-5000-4     10.8µs ± 3%     1.2µs ± 2%  -88.99%  (p=0.029 n=4+4)
SearchPage/ByWeight-10000-4    21.1µs ± 1%     1.4µs ±11%  -93.28%  (p=0.029 n=4+4)
```

See #4500
This commit is contained in:
Bjørn Erik Pedersen
2019-10-11 13:55:46 +02:00
parent f4f566edf4
commit 653e6856ea
8 changed files with 335 additions and 83 deletions
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2
hugolib/pages_test.go
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@@ -63,7 +63,7 @@ func BenchmarkPagesPrevNext(b *testing.B) {
Variant{"Pages.Shuffled.Prev", shufflePages, func(p page.Page, pages page.Pages) { pages.Prev(p) }},
Variant{"Pages.ByTitle.Next", func(pages page.Pages) page.Pages { return pages.ByTitle() }, func(p page.Page, pages page.Pages) { pages.Next(p) }},
} {
for _, numPages := range []int{100, 300, 900, 5000} {
for _, numPages := range []int{300, 5000} {
b.Run(fmt.Sprintf("%s-pages-%d", variant.name, numPages), func(b *testing.B) {
b.StopTimer()
builder := newPagesPrevNextTestSite(b, numPages)