This repo is a fork of
brentp/intintmap. The main change is that it usesuint64instead ofint64.
Fast uint64 -> uint64 hash in golang.
import "github.com/HippoBaro/intintmap"
Package intintmap is a fast uint64 key -> uint64 value map.
It is copied nearly verbatim from http://java-performance.info/implementing-world-fastest-java-int-to-int-hash-map/ .
It interleaves keys and values in the same underlying array to improve locality.
It is 2-5X faster than the builtin map and uses less memory:
BenchmarkFillSequential
BenchmarkFillSequential/Std-8 18 65232116 ns/op 4880488 B/op 2136 allocs/op
BenchmarkFillSequential/IntInt-8 42 26693671 ns/op 2393628 B/op 0 allocs/op
BenchmarkFillSequentialPreAllocated
BenchmarkFillSequentialPreAllocated/Std-8 18 63034107 ns/op 2236945 B/op 1 allocs/op
BenchmarkFillSequentialPreAllocated/IntInt-8 44 27033307 ns/op 762602 B/op 0 allocs/op
BenchmarkFillRandom
BenchmarkFillRandom/Std-8 6 202616442 ns/op 61217498 B/op 36658 allocs/op
BenchmarkFillRandom/IntInt-8 12 204325495 ns/op 134206828 B/op 2 allocs/op
BenchmarkFillRandomPreAllocated
BenchmarkFillRandomPreAllocated/Std-8 6 219628375 ns/op 53283708 B/op 30249 allocs/op
BenchmarkFillRandomPreAllocated/IntInt-8 16 119684014 ns/op 96469003 B/op 0 allocs/op
BenchmarkLookupSequential
BenchmarkLookupSequential/Std-8 15 68508601 ns/op 5854772 B/op 2543 allocs/op
BenchmarkLookupSequential/IntInt-8 39 27021290 ns/op 2577751 B/op 0 allocs/op
BenchmarkLookupRandom
BenchmarkLookupRandom/Std-8 7 145837643 ns/op 12549013 B/op 5490 allocs/op
BenchmarkLookupRandom/IntInt-8 10 102296550 ns/op 10053249 B/op 2 allocs/op
BenchmarkLookupNoHit
BenchmarkLookupNoHit/Std-8 9 123738290 ns/op 9761665 B/op 4265 allocs/op
BenchmarkLookupNoHit/IntInt-8 9 118541631 ns/op 11170256 B/op 2 allocs/op
m := intintmap.New(8096, 0.6)
m.Put(1234, 222)
m.Put(uint64(123), uint64(33))
v, ok := m.Get(uint64(222))
v, ok := m.Get(uint64(333))
m.Del(uint64(222))
m.Del(uint64(333))
fmt.Println(m.Size())
m.Iter(func (k, v uint64) bool {
fmt.Printf("key: %d, value: %d\n", k, v)
return true
})type Map struct {
}Map is a map-like data-structure for int64s
func New(size int, fillFactor float64) *MapNew returns a map initialized with n spaces and uses the stated fillFactor. The map will grow as needed.
func (m *Map) Get(key uint64) (uint64, bool)Get returns the value if the key is found.
func (m *Map) Put(key uint64, val uint64)Put adds or updates key with value val.
func (m *Map) Del(key uint64)Del deletes a key and its value.
func (m *Map) Iter(fn func (uint64, uint64) bool)Iter calls the provided function for each key-value pairs
func (m *Map) Size() intSize returns size of the map.
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