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Faster thread local random for inserts #15

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Merged
panmari merged 2 commits into from
Sep 26, 2023
Merged

Faster thread local random for inserts #15

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fcadf94
Using fastrand instead of global rand.
panmari Sep 15, 2023
118c6b9
Switching to fastrandn, which avoids modulo
panmari Sep 18, 2023
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9 changes: 7 additions & 2 deletions util.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2,14 +2,19 @@ package cuckoo

import (
"encoding/binary"
"math/rand"
_ "unsafe" // For linking fastrand.

metro "github.com/dgryski/go-metro"
)

// fastrand is a fast thread local random function.
//
//go:linkname fastrandn runtime.fastrandn
func fastrandn(n uint32) uint32

// randi returns either i1 or i2 randomly.
func randi(i1, i2 uint) uint {
if rand.Int31()%2 == 0 {
if fastrandn(2) == 0 {
return i1
}
return i2
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