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Add memfs storage based on dolthub's swiss maps

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This commit is contained in:
Ingo Oppermann
2024-08-20 14:14:47 +02:00
parent 68607ed932
commit 1327fd6e21
20 changed files with 1317 additions and 74 deletions
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2
go.mod
View File

@@ -13,6 +13,7 @@ require (
github.com/caddyserver/certmagic v0.21.3
github.com/datarhei/gosrt v0.7.0
github.com/datarhei/joy4 v0.0.0-20240603190808-b1407345907e
github.com/dolthub/swiss v0.2.1
github.com/fujiwara/shapeio v1.0.0
github.com/go-playground/validator/v10 v10.22.0
github.com/gobwas/glob v0.2.3
@@ -61,6 +62,7 @@ require (
github.com/cespare/xxhash/v2 v2.3.0 // indirect
github.com/cpuguy83/go-md2man/v2 v2.0.4 // indirect
github.com/davecgh/go-spew v1.1.1 // indirect
github.com/dolthub/maphash v0.1.0 // indirect
github.com/dustin/go-humanize v1.0.1 // indirect
github.com/fatih/color v1.17.0 // indirect
github.com/gabriel-vasile/mimetype v1.4.5 // indirect

4
go.sum
View File

@@ -55,6 +55,10 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dgryski/trifles v0.0.0-20200323201526-dd97f9abfb48 h1:fRzb/w+pyskVMQ+UbP35JkH8yB7MYb4q/qhBarqZE6g=
github.com/dgryski/trifles v0.0.0-20200323201526-dd97f9abfb48/go.mod h1:if7Fbed8SFyPtHLHbg49SI7NAdJiC5WIA09pe59rfAA=
github.com/dolthub/maphash v0.1.0 h1:bsQ7JsF4FkkWyrP3oCnFJgrCUAFbFf3kOl4L/QxPDyQ=
github.com/dolthub/maphash v0.1.0/go.mod h1:gkg4Ch4CdCDu5h6PMriVLawB7koZ+5ijb9puGMV50a4=
github.com/dolthub/swiss v0.2.1 h1:gs2osYs5SJkAaH5/ggVJqXQxRXtWshF6uE0lgR/Y3Gw=
github.com/dolthub/swiss v0.2.1/go.mod h1:8AhKZZ1HK7g18j7v7k6c5cYIGEZJcPn0ARsai8cUrh0=
github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=

10
io/fs/fs_test.go
View File

@@ -59,8 +59,14 @@ func TestFilesystem(t *testing.T) {
os.RemoveAll("./testing/")
filesystems := map[string]func(string) (Filesystem, error){
"memfs": func(name string) (Filesystem, error) {
return NewMemFilesystem(MemConfig{})
"memfs-map": func(name string) (Filesystem, error) {
return NewMemFilesystem(MemConfig{Storage: "map"})
},
"memfs-xsync": func(name string) (Filesystem, error) {
return NewMemFilesystem(MemConfig{Storage: "xsync"})
},
"memfs-swiss": func(name string) (Filesystem, error) {
return NewMemFilesystem(MemConfig{Storage: "swiss"})
},
"diskfs": func(name string) (Filesystem, error) {
return NewRootedDiskFilesystem(RootedDiskConfig{

2
io/fs/mem.go
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@@ -208,6 +208,8 @@ func NewMemFilesystem(config MemConfig) (Filesystem, error) {
if config.Storage == "map" {
fs.storage = newMapStorage()
} else if config.Storage == "swiss" {
fs.storage = newSwissMapStorage()
} else {
fs.storage = newMapOfStorage()
}

89
io/fs/mem_storage.go
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@@ -4,6 +4,7 @@ import (
"bytes"
"sync"
"github.com/dolthub/swiss"
"github.com/puzpuzpuz/xsync/v3"
)
@@ -182,3 +183,91 @@ func (m *mapStorage) Range(f func(key string, value *memFile) bool) {
}
}
}
type swissMapStorage struct {
lock *xsync.RBMutex
files *swiss.Map[string, *memFile]
}
func newSwissMapStorage() memStorage {
m := &swissMapStorage{
lock: xsync.NewRBMutex(),
files: swiss.NewMap[string, *memFile](128),
}
return m
}
func (m *swissMapStorage) Delete(key string) (*memFile, bool) {
m.lock.Lock()
defer m.lock.Unlock()
file, hasFile := m.files.Get(key)
if !hasFile {
return nil, false
}
m.files.Delete(key)
return file, true
}
func (m *swissMapStorage) Store(key string, value *memFile) (*memFile, bool) {
m.lock.Lock()
defer m.lock.Unlock()
file, hasFile := m.files.Get(key)
m.files.Put(key, value)
return file, hasFile
}
func (m *swissMapStorage) Load(key string) (*memFile, bool) {
token := m.lock.RLock()
defer m.lock.RUnlock(token)
return m.files.Get(key)
}
func (m *swissMapStorage) LoadAndCopy(key string) (*memFile, bool) {
token := m.lock.RLock()
defer m.lock.RUnlock(token)
v, ok := m.files.Get(key)
if !ok {
return nil, false
}
f := &memFile{
memFileInfo: memFileInfo{
name: v.name,
size: v.size,
dir: v.dir,
lastMod: v.lastMod,
linkTo: v.linkTo,
},
r: nil,
}
if v.data != nil {
f.data = bytes.NewBuffer(v.data.Bytes())
}
return f, true
}
func (m *swissMapStorage) Has(key string) bool {
token := m.lock.RLock()
defer m.lock.RUnlock(token)
return m.files.Has(key)
}
func (m *swissMapStorage) Range(f func(key string, value *memFile) bool) {
token := m.lock.RLock()
defer m.lock.RUnlock(token)
m.files.Iter(func(key string, value *memFile) bool {
return !f(key, value)
})
}

156
io/fs/mem_test.go
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@@ -30,66 +30,6 @@ func TestMemFromDir(t *testing.T) {
}, names)
}
func BenchmarkMemList(b *testing.B) {
mem, err := NewMemFilesystem(MemConfig{})
require.NoError(b, err)
for i := 0; i < 1000; i++ {
id := rand.StringAlphanumeric(8)
path := fmt.Sprintf("/%d/%s.dat", i, id)
mem.WriteFile(path, []byte("foobar"))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
mem.List("/", ListOptions{
Pattern: "/5/**",
})
}
}
func BenchmarkMemRemoveList(b *testing.B) {
mem, err := NewMemFilesystem(MemConfig{})
require.NoError(b, err)
for i := 0; i < 1000; i++ {
id := rand.StringAlphanumeric(8)
path := fmt.Sprintf("/%d/%s.dat", i, id)
mem.WriteFile(path, []byte("foobar"))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
mem.RemoveList("/", ListOptions{
Pattern: "/5/**",
})
}
}
func BenchmarkMemReadFile(b *testing.B) {
mem, err := NewMemFilesystem(MemConfig{})
require.NoError(b, err)
nFiles := 1000
for i := 0; i < nFiles; i++ {
path := fmt.Sprintf("/%d.dat", i)
mem.WriteFile(path, []byte(rand.StringAlphanumeric(2*1024)))
}
r := gorand.New(gorand.NewSource(42))
b.ResetTimer()
for i := 0; i < b.N; i++ {
num := r.Intn(nFiles)
f := mem.Open("/" + strconv.Itoa(num) + ".dat")
f.Close()
}
}
func TestWriteWhileRead(t *testing.T) {
fs, err := NewMemFilesystem(MemConfig{})
require.NoError(t, err)
@@ -108,29 +48,101 @@ func TestWriteWhileRead(t *testing.T) {
require.Equal(t, []byte("xxxxx"), data)
}
func BenchmarkMemWriteFile(b *testing.B) {
mem, err := NewMemFilesystem(MemConfig{})
require.NoError(b, err)
func BenchmarkMemStorages(b *testing.B) {
storages := []string{
"map",
"xsync",
"swiss",
}
benchmarks := map[string]func(*testing.B, Filesystem){
"list": benchmarkMemList,
"removeList": benchmarkMemRemoveList,
"readFile": benchmarkMemReadFile,
"writeFile": benchmarkMemWriteFile,
"readWhileWrite": benchmarkMemReadFileWhileWriting,
}
for name, fn := range benchmarks {
for _, storage := range storages {
mem, err := NewMemFilesystem(MemConfig{Storage: storage})
require.NoError(b, err)
b.Run(name+"-"+storage, func(b *testing.B) {
fn(b, mem)
})
}
}
}
func benchmarkMemList(b *testing.B, fs Filesystem) {
for i := 0; i < 1000; i++ {
id := rand.StringAlphanumeric(8)
path := fmt.Sprintf("/%d/%s.dat", i, id)
fs.WriteFile(path, []byte("foobar"))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
fs.List("/", ListOptions{
Pattern: "/5/**",
})
}
}
func benchmarkMemRemoveList(b *testing.B, fs Filesystem) {
for i := 0; i < 1000; i++ {
id := rand.StringAlphanumeric(8)
path := fmt.Sprintf("/%d/%s.dat", i, id)
fs.WriteFile(path, []byte("foobar"))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
fs.RemoveList("/", ListOptions{
Pattern: "/5/**",
})
}
}
func benchmarkMemReadFile(b *testing.B, fs Filesystem) {
nFiles := 1000
for i := 0; i < nFiles; i++ {
path := fmt.Sprintf("/%d.dat", i)
fs.WriteFile(path, []byte(rand.StringAlphanumeric(2*1024)))
}
r := gorand.New(gorand.NewSource(42))
b.ResetTimer()
for i := 0; i < b.N; i++ {
num := r.Intn(nFiles)
f := fs.Open("/" + strconv.Itoa(num) + ".dat")
f.Close()
}
}
func benchmarkMemWriteFile(b *testing.B, fs Filesystem) {
nFiles := 50000
for i := 0; i < nFiles; i++ {
path := fmt.Sprintf("/%d.dat", i)
mem.WriteFile(path, []byte(rand.StringAlphanumeric(1)))
fs.WriteFile(path, []byte(rand.StringAlphanumeric(1)))
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
path := fmt.Sprintf("/%d.dat", i%nFiles)
mem.WriteFile(path, []byte(rand.StringAlphanumeric(1)))
fs.WriteFile(path, []byte(rand.StringAlphanumeric(1)))
}
}
func BenchmarkMemReadFileWhileWriting(b *testing.B) {
mem, err := NewMemFilesystem(MemConfig{})
require.NoError(b, err)
func benchmarkMemReadFileWhileWriting(b *testing.B, fs Filesystem) {
nReaders := 500
nWriters := 1000
nFiles := 30
@@ -148,7 +160,7 @@ func BenchmarkMemReadFileWhileWriting(b *testing.B) {
go func(ctx context.Context, from int) {
for i := 0; i < nFiles; i++ {
path := fmt.Sprintf("/%d.dat", from+i)
mem.WriteFile(path, data)
fs.WriteFile(path, data)
}
ticker := time.NewTicker(40 * time.Millisecond)
@@ -163,7 +175,7 @@ func BenchmarkMemReadFileWhileWriting(b *testing.B) {
case <-ticker.C:
num := gorand.Intn(nFiles) + from
path := fmt.Sprintf("/%d.dat", num)
mem.WriteFile(path, data)
fs.WriteFile(path, data)
}
}
}(ctx, i*nFiles)
@@ -183,7 +195,7 @@ func BenchmarkMemReadFileWhileWriting(b *testing.B) {
for i := 0; i < b.N; i++ {
num := gorand.Intn(nWriters * nFiles)
f := mem.Open("/" + strconv.Itoa(num) + ".dat")
f := fs.Open("/" + strconv.Itoa(num) + ".dat")
f.Close()
}
}()

2
vendor/github.com/dolthub/maphash/.gitignore generated vendored Normal file
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@@ -0,0 +1,2 @@
*.idea
*.test

201
vendor/github.com/dolthub/maphash/LICENSE generated vendored Normal file
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@@ -0,0 +1,201 @@
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4
vendor/github.com/dolthub/maphash/README.md generated vendored Normal file
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@@ -0,0 +1,4 @@
# maphash
Hash any `comparable` type using Golang's fast runtime hash.
Uses [AES](https://en.wikipedia.org/wiki/AES_instruction_set) instructions when available.

48
vendor/github.com/dolthub/maphash/hasher.go generated vendored Normal file
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@@ -0,0 +1,48 @@
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package maphash
import "unsafe"
// Hasher hashes values of type K.
// Uses runtime AES-based hashing.
type Hasher[K comparable] struct {
hash hashfn
seed uintptr
}
// NewHasher creates a new Hasher[K] with a random seed.
func NewHasher[K comparable]() Hasher[K] {
return Hasher[K]{
hash: getRuntimeHasher[K](),
seed: newHashSeed(),
}
}
// NewSeed returns a copy of |h| with a new hash seed.
func NewSeed[K comparable](h Hasher[K]) Hasher[K] {
return Hasher[K]{
hash: h.hash,
seed: newHashSeed(),
}
}
// Hash hashes |key|.
func (h Hasher[K]) Hash(key K) uint64 {
// promise to the compiler that pointer
// |p| does not escape the stack.
p := noescape(unsafe.Pointer(&key))
return uint64(h.hash(p, h.seed))
}

111
vendor/github.com/dolthub/maphash/runtime.go generated vendored Normal file
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@@ -0,0 +1,111 @@
// Copyright 2022 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// This file incorporates work covered by the following copyright and
// permission notice:
//
// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.18 || go1.19
// +build go1.18 go1.19
package maphash
import (
"math/rand"
"unsafe"
)
type hashfn func(unsafe.Pointer, uintptr) uintptr
func getRuntimeHasher[K comparable]() (h hashfn) {
a := any(make(map[K]struct{}))
i := (*mapiface)(unsafe.Pointer(&a))
h = i.typ.hasher
return
}
func newHashSeed() uintptr {
return uintptr(rand.Int())
}
// noescape hides a pointer from escape analysis. It is the identity function
// but escape analysis doesn't think the output depends on the input.
// noescape is inlined and currently compiles down to zero instructions.
// USE CAREFULLY!
// This was copied from the runtime (via pkg "strings"); see issues 23382 and 7921.
//
//go:nosplit
//go:nocheckptr
func noescape(p unsafe.Pointer) unsafe.Pointer {
x := uintptr(p)
return unsafe.Pointer(x ^ 0)
}
type mapiface struct {
typ *maptype
val *hmap
}
// go/src/runtime/type.go
type maptype struct {
typ _type
key *_type
elem *_type
bucket *_type
// function for hashing keys (ptr to key, seed) -> hash
hasher func(unsafe.Pointer, uintptr) uintptr
keysize uint8
elemsize uint8
bucketsize uint16
flags uint32
}
// go/src/runtime/map.go
type hmap struct {
count int
flags uint8
B uint8
noverflow uint16
// hash seed
hash0 uint32
buckets unsafe.Pointer
oldbuckets unsafe.Pointer
nevacuate uintptr
// true type is *mapextra
// but we don't need this data
extra unsafe.Pointer
}
// go/src/runtime/type.go
type tflag uint8
type nameOff int32
type typeOff int32
// go/src/runtime/type.go
type _type struct {
size uintptr
ptrdata uintptr
hash uint32
tflag tflag
align uint8
fieldAlign uint8
kind uint8
equal func(unsafe.Pointer, unsafe.Pointer) bool
gcdata *byte
str nameOff
ptrToThis typeOff
}

5
vendor/github.com/dolthub/swiss/.gitignore generated vendored Normal file
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**/.idea/
.vscode
.run
venv
.DS_Store

201
vendor/github.com/dolthub/swiss/LICENSE generated vendored Normal file
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
1. Definitions.
"License" shall mean the terms and conditions for use, reproduction,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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54
vendor/github.com/dolthub/swiss/README.md generated vendored Normal file
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# SwissMap
SwissMap is a hash table adapated from the "SwissTable" family of hash tables from [Abseil](https://abseil.io/blog/20180927-swisstables). It uses [AES](https://github.com/dolthub/maphash) instructions for fast-hashing and performs key lookups in parallel using [SSE](https://en.wikipedia.org/wiki/Streaming_SIMD_Extensions) instructions. Because of these optimizations, SwissMap is faster and more memory efficient than Golang's built-in `map`. If you'd like to learn more about its design and implementation, check out this [blog post](https://www.dolthub.com/blog/2023-03-28-swiss-map/) announcing its release.
## Example
SwissMap exposes the same interface as the built-in `map`. Give it a try using this [Go playground](https://go.dev/play/p/JPDC5WhYN7g).
```go
package main
import "github.com/dolthub/swiss"
func main() {
m := swiss.NewMap[string, int](42)
m.Put("foo", 1)
m.Put("bar", 2)
m.Iter(func(k string, v int) (stop bool) {
println("iter", k, v)
return false // continue
})
if x, ok := m.Get("foo"); ok {
println(x)
}
if m.Has("bar") {
x, _ := m.Get("bar")
println(x)
}
m.Put("foo", -1)
m.Delete("bar")
if x, ok := m.Get("foo"); ok {
println(x)
}
if m.Has("bar") {
x, _ := m.Get("bar")
println(x)
}
m.Clear()
// Output:
// iter foo 1
// iter bar 2
// 1
// 2
// -1
}
```

58
vendor/github.com/dolthub/swiss/bits.go generated vendored Normal file
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// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !amd64 || nosimd
package swiss
import (
"math/bits"
"unsafe"
)
const (
groupSize = 8
maxAvgGroupLoad = 7
loBits uint64 = 0x0101010101010101
hiBits uint64 = 0x8080808080808080
)
type bitset uint64
func metaMatchH2(m *metadata, h h2) bitset {
// https://graphics.stanford.edu/~seander/bithacks.html##ValueInWord
return hasZeroByte(castUint64(m) ^ (loBits * uint64(h)))
}
func metaMatchEmpty(m *metadata) bitset {
return hasZeroByte(castUint64(m) ^ hiBits)
}
func nextMatch(b *bitset) uint32 {
s := uint32(bits.TrailingZeros64(uint64(*b)))
*b &= ^(1 << s) // clear bit |s|
return s >> 3 // div by 8
}
func hasZeroByte(x uint64) bitset {
return bitset(((x - loBits) & ^(x)) & hiBits)
}
func castUint64(m *metadata) uint64 {
return *(*uint64)((unsafe.Pointer)(m))
}
//go:linkname fastrand runtime.fastrand
func fastrand() uint32

50
vendor/github.com/dolthub/swiss/bits_amd64.go generated vendored Normal file
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// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build amd64 && !nosimd
package swiss
import (
"math/bits"
_ "unsafe"
"github.com/dolthub/swiss/simd"
)
const (
groupSize = 16
maxAvgGroupLoad = 14
)
type bitset uint16
func metaMatchH2(m *metadata, h h2) bitset {
b := simd.MatchMetadata((*[16]int8)(m), int8(h))
return bitset(b)
}
func metaMatchEmpty(m *metadata) bitset {
b := simd.MatchMetadata((*[16]int8)(m), empty)
return bitset(b)
}
func nextMatch(b *bitset) (s uint32) {
s = uint32(bits.TrailingZeros16(uint16(*b)))
*b &= ^(1 << s) // clear bit |s|
return
}
//go:linkname fastrand runtime.fastrand
func fastrand() uint32

359
vendor/github.com/dolthub/swiss/map.go generated vendored Normal file
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// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package swiss
import (
"github.com/dolthub/maphash"
)
const (
maxLoadFactor = float32(maxAvgGroupLoad) / float32(groupSize)
)
// Map is an open-addressing hash map
// based on Abseil's flat_hash_map.
type Map[K comparable, V any] struct {
ctrl []metadata
groups []group[K, V]
hash maphash.Hasher[K]
resident uint32
dead uint32
limit uint32
}
// metadata is the h2 metadata array for a group.
// find operations first probe the controls bytes
// to filter candidates before matching keys
type metadata [groupSize]int8
// group is a group of 16 key-value pairs
type group[K comparable, V any] struct {
keys [groupSize]K
values [groupSize]V
}
const (
h1Mask uint64 = 0xffff_ffff_ffff_ff80
h2Mask uint64 = 0x0000_0000_0000_007f
empty int8 = -128 // 0b1000_0000
tombstone int8 = -2 // 0b1111_1110
)
// h1 is a 57 bit hash prefix
type h1 uint64
// h2 is a 7 bit hash suffix
type h2 int8
// NewMap constructs a Map.
func NewMap[K comparable, V any](sz uint32) (m *Map[K, V]) {
groups := numGroups(sz)
m = &Map[K, V]{
ctrl: make([]metadata, groups),
groups: make([]group[K, V], groups),
hash: maphash.NewHasher[K](),
limit: groups * maxAvgGroupLoad,
}
for i := range m.ctrl {
m.ctrl[i] = newEmptyMetadata()
}
return
}
// Has returns true if |key| is present in |m|.
func (m *Map[K, V]) Has(key K) (ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
ok = true
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Get returns the |value| mapped by |key| if one exists.
func (m *Map[K, V]) Get(key K) (value V, ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
value, ok = m.groups[g].values[s], true
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Put attempts to insert |key| and |value|
func (m *Map[K, V]) Put(key K, value V) {
if m.resident >= m.limit {
m.rehash(m.nextSize())
}
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for { // inlined find loop
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] { // update
m.groups[g].keys[s] = key
m.groups[g].values[s] = value
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 { // insert
s := nextMatch(&matches)
m.groups[g].keys[s] = key
m.groups[g].values[s] = value
m.ctrl[g][s] = int8(lo)
m.resident++
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Delete attempts to remove |key|, returns true successful.
func (m *Map[K, V]) Delete(key K) (ok bool) {
hi, lo := splitHash(m.hash.Hash(key))
g := probeStart(hi, len(m.groups))
for {
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s := nextMatch(&matches)
if key == m.groups[g].keys[s] {
ok = true
// optimization: if |m.ctrl[g]| contains any empty
// metadata bytes, we can physically delete |key|
// rather than placing a tombstone.
// The observation is that any probes into group |g|
// would already be terminated by the existing empty
// slot, and therefore reclaiming slot |s| will not
// cause premature termination of probes into |g|.
if metaMatchEmpty(&m.ctrl[g]) != 0 {
m.ctrl[g][s] = empty
m.resident--
} else {
m.ctrl[g][s] = tombstone
m.dead++
}
var k K
var v V
m.groups[g].keys[s] = k
m.groups[g].values[s] = v
return
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 { // |key| absent
ok = false
return
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
// Iter iterates the elements of the Map, passing them to the callback.
// It guarantees that any key in the Map will be visited only once, and
// for un-mutated Maps, every key will be visited once. If the Map is
// Mutated during iteration, mutations will be reflected on return from
// Iter, but the set of keys visited by Iter is non-deterministic.
func (m *Map[K, V]) Iter(cb func(k K, v V) (stop bool)) {
// take a consistent view of the table in case
// we rehash during iteration
ctrl, groups := m.ctrl, m.groups
// pick a random starting group
g := randIntN(len(groups))
for n := 0; n < len(groups); n++ {
for s, c := range ctrl[g] {
if c == empty || c == tombstone {
continue
}
k, v := groups[g].keys[s], groups[g].values[s]
if stop := cb(k, v); stop {
return
}
}
g++
if g >= uint32(len(groups)) {
g = 0
}
}
}
// Clear removes all elements from the Map.
func (m *Map[K, V]) Clear() {
for i, c := range m.ctrl {
for j := range c {
m.ctrl[i][j] = empty
}
}
var k K
var v V
for i := range m.groups {
g := &m.groups[i]
for i := range g.keys {
g.keys[i] = k
g.values[i] = v
}
}
m.resident, m.dead = 0, 0
}
// Count returns the number of elements in the Map.
func (m *Map[K, V]) Count() int {
return int(m.resident - m.dead)
}
// Capacity returns the number of additional elements
// the can be added to the Map before resizing.
func (m *Map[K, V]) Capacity() int {
return int(m.limit - m.resident)
}
// find returns the location of |key| if present, or its insertion location if absent.
// for performance, find is manually inlined into public methods.
func (m *Map[K, V]) find(key K, hi h1, lo h2) (g, s uint32, ok bool) {
g = probeStart(hi, len(m.groups))
for {
matches := metaMatchH2(&m.ctrl[g], lo)
for matches != 0 {
s = nextMatch(&matches)
if key == m.groups[g].keys[s] {
return g, s, true
}
}
// |key| is not in group |g|,
// stop probing if we see an empty slot
matches = metaMatchEmpty(&m.ctrl[g])
if matches != 0 {
s = nextMatch(&matches)
return g, s, false
}
g += 1 // linear probing
if g >= uint32(len(m.groups)) {
g = 0
}
}
}
func (m *Map[K, V]) nextSize() (n uint32) {
n = uint32(len(m.groups)) * 2
if m.dead >= (m.resident / 2) {
n = uint32(len(m.groups))
}
return
}
func (m *Map[K, V]) rehash(n uint32) {
groups, ctrl := m.groups, m.ctrl
m.groups = make([]group[K, V], n)
m.ctrl = make([]metadata, n)
for i := range m.ctrl {
m.ctrl[i] = newEmptyMetadata()
}
m.hash = maphash.NewSeed(m.hash)
m.limit = n * maxAvgGroupLoad
m.resident, m.dead = 0, 0
for g := range ctrl {
for s := range ctrl[g] {
c := ctrl[g][s]
if c == empty || c == tombstone {
continue
}
m.Put(groups[g].keys[s], groups[g].values[s])
}
}
}
func (m *Map[K, V]) loadFactor() float32 {
slots := float32(len(m.groups) * groupSize)
return float32(m.resident-m.dead) / slots
}
// numGroups returns the minimum number of groups needed to store |n| elems.
func numGroups(n uint32) (groups uint32) {
groups = (n + maxAvgGroupLoad - 1) / maxAvgGroupLoad
if groups == 0 {
groups = 1
}
return
}
func newEmptyMetadata() (meta metadata) {
for i := range meta {
meta[i] = empty
}
return
}
func splitHash(h uint64) (h1, h2) {
return h1((h & h1Mask) >> 7), h2(h & h2Mask)
}
func probeStart(hi h1, groups int) uint32 {
return fastModN(uint32(hi), uint32(groups))
}
// lemire.me/blog/2016/06/27/a-fast-alternative-to-the-modulo-reduction/
func fastModN(x, n uint32) uint32 {
return uint32((uint64(x) * uint64(n)) >> 32)
}
// randIntN returns a random number in the interval [0, n).
func randIntN(n int) uint32 {
return fastModN(fastrand(), uint32(n))
}

19
vendor/github.com/dolthub/swiss/simd/match.s generated vendored Normal file
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// Code generated by command: go run asm.go -out match.s -stubs match_amd64.go. DO NOT EDIT.
//go:build amd64
#include "textflag.h"
// func MatchMetadata(metadata *[16]int8, hash int8) uint16
// Requires: SSE2, SSSE3
TEXT ·MatchMetadata(SB), NOSPLIT, $0-18
MOVQ metadata+0(FP), AX
MOVBLSX hash+8(FP), CX
MOVD CX, X0
PXOR X1, X1
PSHUFB X1, X0
MOVOU (AX), X1
PCMPEQB X1, X0
PMOVMSKB X0, AX
MOVW AX, ret+16(FP)
RET

9
vendor/github.com/dolthub/swiss/simd/match_amd64.go generated vendored Normal file
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@@ -0,0 +1,9 @@
// Code generated by command: go run asm.go -out match.s -stubs match_amd64.go. DO NOT EDIT.
//go:build amd64
package simd
// MatchMetadata performs a 16-way probe of |metadata| using SSE instructions
// nb: |metadata| must be an aligned pointer
func MatchMetadata(metadata *[16]int8, hash int8) uint16

7
vendor/modules.txt vendored
View File

@@ -106,6 +106,13 @@ github.com/datarhei/joy4/utils/bits/pio
# github.com/davecgh/go-spew v1.1.1
## explicit
github.com/davecgh/go-spew/spew
# github.com/dolthub/maphash v0.1.0
## explicit; go 1.18
github.com/dolthub/maphash
# github.com/dolthub/swiss v0.2.1
## explicit; go 1.18
github.com/dolthub/swiss
github.com/dolthub/swiss/simd
# github.com/dustin/go-humanize v1.0.1
## explicit; go 1.16
github.com/dustin/go-humanize