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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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4
resources/page/weighted.go
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@@ -99,7 +99,7 @@ func (wp WeightedPages) Pages() Pages {
// this weighted page set.
func (wp WeightedPages) Next(cur Page) Page {
for x, c := range wp {
if c.Page == cur {
if c.Page.Eq(cur) {
if x == 0 {
return nil
}
@@ -113,7 +113,7 @@ func (wp WeightedPages) Next(cur Page) Page {
// this weighted page set.
func (wp WeightedPages) Prev(cur Page) Page {
for x, c := range wp {
if c.Page == cur {
if c.Page.Eq(cur) {
if x < len(wp)-1 {
return wp[x+1].Page
}