updates go-mutexes to no longer rely on unsafe linkname (#3027)

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kim 2024-06-21 16:35:32 +00:00 committed by GitHub
parent b93087ceb4
commit 9143ac6fb4
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19 changed files with 134 additions and 1242 deletions

4
go.mod
View file

@ -17,7 +17,7 @@ require (
codeberg.org/gruf/go-list v0.0.0-20240425093752-494db03d641f
codeberg.org/gruf/go-logger/v2 v2.2.1
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760
codeberg.org/gruf/go-mutexes v1.5.0
codeberg.org/gruf/go-mutexes v1.5.1
codeberg.org/gruf/go-runners v1.6.2
codeberg.org/gruf/go-sched v1.2.3
codeberg.org/gruf/go-storage v0.1.1
@ -107,8 +107,6 @@ require (
github.com/coreos/go-systemd/v22 v22.3.2 // indirect
github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
github.com/docker/go-units v0.5.0 // indirect
github.com/dolthub/maphash v0.1.0 // indirect
github.com/dolthub/swiss v0.2.1 // indirect
github.com/dsoprea/go-exif/v3 v3.0.0-20210625224831-a6301f85c82b // indirect
github.com/dsoprea/go-iptc v0.0.0-20200610044640-bc9ca208b413 // indirect
github.com/dsoprea/go-logging v0.0.0-20200710184922-b02d349568dd // indirect

8
go.sum
View file

@ -68,8 +68,8 @@ codeberg.org/gruf/go-maps v1.0.3 h1:VDwhnnaVNUIy5O93CvkcE2IZXnMB1+IJjzfop9V12es=
codeberg.org/gruf/go-maps v1.0.3/go.mod h1:D5LNDxlC9rsDuVQVM6JObaVGAdHB6g2dTdOdkh1aXWA=
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760 h1:m2/UCRXhjDwAg4vyji6iKCpomKw6P4PmBOUi5DvAMH4=
codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760/go.mod h1:E3RcaCFNq4zXpvaJb8lfpPqdUAmSkP5F1VmMiEUYTEk=
codeberg.org/gruf/go-mutexes v1.5.0 h1:kDegqA/FYQhcn294zUJ3U3VBegfvhtcI7ObcAku1zkw=
codeberg.org/gruf/go-mutexes v1.5.0/go.mod h1:rPEqQ/y6CmGITaZ3GPTMQVsoZAOzbsAHyIaLsJcOqVE=
codeberg.org/gruf/go-mutexes v1.5.1 h1:xICU0WXhWr6wf+Iror4eE3xT+xnXNPrO6o77D/G6QuY=
codeberg.org/gruf/go-mutexes v1.5.1/go.mod h1:rPEqQ/y6CmGITaZ3GPTMQVsoZAOzbsAHyIaLsJcOqVE=
codeberg.org/gruf/go-runners v1.6.2 h1:oQef9niahfHu/wch14xNxlRMP8i+ABXH1Cb9PzZ4oYo=
codeberg.org/gruf/go-runners v1.6.2/go.mod h1:Tq5PrZ/m/rBXbLZz0u5if+yP3nG5Sf6S8O/GnyEePeQ=
codeberg.org/gruf/go-sched v1.2.3 h1:H5ViDxxzOBR3uIyGBCf0eH8b1L8wMybOXcdtUUTXZHk=
@ -148,10 +148,6 @@ github.com/disintegration/imaging v1.6.2 h1:w1LecBlG2Lnp8B3jk5zSuNqd7b4DXhcjwek1
github.com/disintegration/imaging v1.6.2/go.mod h1:44/5580QXChDfwIclfc/PCwrr44amcmDAg8hxG0Ewe4=
github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
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/dsoprea/go-exif/v2 v2.0.0-20200321225314-640175a69fe4/go.mod h1:Lm2lMM2zx8p4a34ZemkaUV95AnMl4ZvLbCUbwOvLC2E=
github.com/dsoprea/go-exif/v3 v3.0.0-20200717053412-08f1b6708903/go.mod h1:0nsO1ce0mh5czxGeLo4+OCZ/C6Eo6ZlMWsz7rH/Gxv8=
github.com/dsoprea/go-exif/v3 v3.0.0-20210428042052-dca55bf8ca15/go.mod h1:cg5SNYKHMmzxsr9X6ZeLh/nfBRHHp5PngtEPcujONtk=

View file

@ -2,86 +2,66 @@
import (
"sync"
"unsafe"
)
// Cond is similar to a sync.Cond{}, but
// it encompasses the Mutex{} within itself.
type Cond struct {
notify notifyList
c sync.Cond
sync.Mutex
}
// See: sync.Cond{}.Wait().
func (c *Cond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.Mutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.Mutex.Lock()
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Wait()
}
// See: sync.Cond{}.Signal().
func (c *Cond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
func (c *Cond) Signal() {
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Signal()
}
// See: sync.Cond{}.Broadcast().
func (c *Cond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
func (c *Cond) Broadcast() {
if c.c.L == nil {
c.c.L = &c.Mutex
}
c.c.Broadcast()
}
// RWCond is similar to a sync.Cond{}, but
// it encompasses the RWMutex{} within itself.
type RWCond struct {
notify notifyList
c sync.Cond
sync.RWMutex
}
// See: sync.Cond{}.Wait().
func (c *RWCond) Wait() {
t := runtime_notifyListAdd(&c.notify)
c.RWMutex.Unlock()
runtime_notifyListWait(&c.notify, t)
c.RWMutex.Lock()
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Wait()
}
// See: sync.Cond{}.Signal().
func (c *RWCond) Signal() { runtime_notifyListNotifyOne(&c.notify) }
func (c *RWCond) Signal() {
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Signal()
}
// See: sync.Cond{}.Broadcast().
func (c *RWCond) Broadcast() { runtime_notifyListNotifyAll(&c.notify) }
// unused fields left
// un-named for safety.
type notifyList struct {
_ uint32 // wait uint32
notify uint32 // notify uint32
_ uintptr // lock mutex
_ unsafe.Pointer // head *sudog
_ unsafe.Pointer // tail *sudog
}
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListAdd sync.runtime_notifyListAdd
func runtime_notifyListAdd(l *notifyList) uint32
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListWait sync.runtime_notifyListWait
func runtime_notifyListWait(l *notifyList, t uint32)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyOne sync.runtime_notifyListNotifyOne
func runtime_notifyListNotifyOne(l *notifyList)
// See runtime/sema.go for documentation.
//
//go:linkname runtime_notifyListNotifyAll sync.runtime_notifyListNotifyAll
func runtime_notifyListNotifyAll(l *notifyList)
// Ensure that sync and runtime agree on size of notifyList.
//
//go:linkname runtime_notifyListCheck sync.runtime_notifyListCheck
func runtime_notifyListCheck(size uintptr)
func init() {
var n notifyList
runtime_notifyListCheck(unsafe.Sizeof(n))
func (c *RWCond) Broadcast() {
if c.c.L == nil {
c.c.L = &c.RWMutex
}
c.c.Broadcast()
}

56
vendor/codeberg.org/gruf/go-mutexes/hash_map.go generated vendored Normal file
View file

@ -0,0 +1,56 @@
package mutexes
type hashmap struct {
m map[string]*rwmutex
n int
}
func (m *hashmap) init(cap int) {
m.m = make(map[string]*rwmutex, cap)
m.n = cap
}
func (m *hashmap) Get(key string) *rwmutex { return m.m[key] }
func (m *hashmap) Put(key string, mu *rwmutex) {
m.m[key] = mu
if n := len(m.m); n > m.n {
m.n = n
}
}
func (m *hashmap) Delete(key string) {
delete(m.m, key)
}
func (m *hashmap) Compact() {
// Noop when hashmap size
// is too small to matter.
if m.n < 2048 {
return
}
// Difference between maximum map
// size and the current map size.
diff := m.n - len(m.m)
// Maximum load factor before
// runtime allocates new hmap:
// maxLoad = 13 / 16
//
// So we apply the inverse/2, once
// $maxLoad/2 % of hmap is empty we
// compact the map to drop buckets.
if 2*16*diff > m.n*13 {
// Create new map only as big as required.
m2 := make(map[string]*rwmutex, len(m.m))
for k, v := range m.m {
m2[k] = v
}
// Set new.
m.m = m2
m.n = len(m2)
}
}

View file

@ -6,7 +6,6 @@
"unsafe"
"codeberg.org/gruf/go-mempool"
"github.com/dolthub/swiss"
)
const (
@ -27,14 +26,14 @@
// like structures for sleeping / awaking awaiting goroutines.
type MutexMap struct {
mapmu sync.Mutex
mumap *swiss.Map[string, *rwmutex]
mumap hashmap
mupool mempool.UnsafePool
}
// checkInit ensures MutexMap is initialized (UNSAFE).
func (mm *MutexMap) checkInit() {
if mm.mumap == nil {
mm.mumap = swiss.NewMap[string, *rwmutex](0)
if mm.mumap.m == nil {
mm.mumap.init(0)
mm.mupool.DirtyFactor = 256
}
}
@ -58,7 +57,7 @@ func (mm *MutexMap) lock(key string, lt uint8) func() {
for {
// Check map for mutex.
mu, _ := mm.mumap.Get(key)
mu := mm.mumap.Get(key)
if mu == nil {
// Allocate mutex.
@ -69,7 +68,7 @@ func (mm *MutexMap) lock(key string, lt uint8) func() {
if !mu.Lock(lt) {
// Wait on mutex unlock, after
// immediately relocking map mu.
mu.WaitRelock(&mm.mapmu)
mu.WaitRelock()
continue
}
@ -100,27 +99,9 @@ func (mm *MutexMap) unlock(key string, mu *rwmutex) {
mm.mumap.Delete(key)
mm.release(mu)
// Maximum load factor before
// 'swiss' allocates new hmap:
// maxLoad = 7 / 8
//
// So we apply the inverse/2, once
// $maxLoad/2 % of hmap is empty we
// compact the map to drop buckets.
len := mm.mumap.Count()
cap := mm.mumap.Capacity()
if cap-len > (cap*7)/(8*2) {
// Create a new map only as big as required.
mumap := swiss.NewMap[string, *rwmutex](uint32(len))
mm.mumap.Iter(func(k string, v *rwmutex) (stop bool) {
mumap.Put(k, v)
return false
})
// Set new map.
mm.mumap = mumap
}
// Check if compaction
// needed.
mm.mumap.Compact()
// Done with map.
mm.mapmu.Unlock()
@ -131,7 +112,9 @@ func (mm *MutexMap) acquire() *rwmutex {
if ptr := mm.mupool.Get(); ptr != nil {
return (*rwmutex)(ptr)
}
return new(rwmutex)
mu := new(rwmutex)
mu.c.L = &mm.mapmu
return mu
}
// release will release given mutex to memory pool.
@ -152,9 +135,9 @@ func (mm *MutexMap) release(mu *rwmutex) {
// mechanism we use, otherwise all Cond{}.L would reference
// the same outer map mutex.
type rwmutex struct {
n notifyList // 'trigger' mechanism
l int32 // no. locks
t uint8 // lock type
c sync.Cond // 'trigger' mechanism
l int32 // no. locks
t uint8 // lock type
}
// Lock will lock the mutex for given lock type, in the
@ -202,11 +185,34 @@ func (mu *rwmutex) Unlock() bool {
// Fully unlocked.
mu.t = 0
// NOTE: must remain in
// sync with runtime.notifyList{}.
//
// goexperiment.staticlockranking
// does change it slightly, but
// this does not alter the first
// 2 fields which are all we need.
type notifyList struct {
_ uint32
notify uint32
// ... other fields
}
// NOTE: must remain in
// sync with sync.Cond{}.
type syncCond struct {
_ struct{}
L sync.Locker
n notifyList
// ... other fields
}
// Awake all blocked goroutines and check
// for change in the last notified ticket.
before := atomic.LoadUint32(&mu.n.notify)
runtime_notifyListNotifyAll(&mu.n)
after := atomic.LoadUint32(&mu.n.notify)
cptr := (*syncCond)(unsafe.Pointer(&mu.c))
before := atomic.LoadUint32(&cptr.n.notify)
mu.c.Broadcast() // awakes all blocked!
after := atomic.LoadUint32(&cptr.n.notify)
// If ticket changed, this indicates
// AT LEAST one goroutine was awoken.
@ -226,20 +232,4 @@ func (mu *rwmutex) Unlock() bool {
// locked state. It incr the notifyList waiter count before
// unlocking the outer mutex and blocking on notifyList wait.
// On awake it will decr wait count and relock outer mutex.
func (mu *rwmutex) WaitRelock(outer *sync.Mutex) {
// add ourselves to list while still
// under protection of outer map lock.
t := runtime_notifyListAdd(&mu.n)
// Finished with
// outer map lock.
outer.Unlock()
// Block until awoken by another
// goroutine within mu.Unlock().
runtime_notifyListWait(&mu.n, t)
// Relock!
outer.Lock()
}
func (mu *rwmutex) WaitRelock() { mu.c.Wait() }

View file

@ -1,2 +0,0 @@
*.idea
*.test

View file

@ -1,201 +0,0 @@
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View file

@ -1,4 +0,0 @@
# maphash
Hash any `comparable` type using Golang's fast runtime hash.
Uses [AES](https://en.wikipedia.org/wiki/AES_instruction_set) instructions when available.

View file

@ -1,48 +0,0 @@
// 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))
}

View file

@ -1,111 +0,0 @@
// 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
}

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@ -1,5 +0,0 @@
**/.idea/
.vscode
.run
venv
.DS_Store

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@ -1,201 +0,0 @@
Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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7. Disclaimer of Warranty. Unless required by applicable law or
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Contributor provides its Contributions) on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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whether in tort (including negligence), contract, or otherwise,
unless required by applicable law (such as deliberate and grossly
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APPENDIX: How to apply the Apache License to your work.
To apply the Apache License to your work, attach the following
boilerplate notice, with the fields enclosed by brackets "[]"
replaced with your own identifying information. (Don't include
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Copyright [yyyy] [name of copyright owner]
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
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Unless required by applicable law or agreed to in writing, software
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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.

View file

@ -1,54 +0,0 @@
# 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
}
```

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@ -1,58 +0,0 @@
// 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

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@ -1,50 +0,0 @@
// 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

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@ -1,359 +0,0 @@
// 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))
}

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@ -1,19 +0,0 @@
// 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

View file

@ -1,9 +0,0 @@
// 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

9
vendor/modules.txt vendored
View file

@ -52,7 +52,7 @@ codeberg.org/gruf/go-maps
# codeberg.org/gruf/go-mempool v0.0.0-20240507125005-cef10d64a760
## explicit; go 1.22.2
codeberg.org/gruf/go-mempool
# codeberg.org/gruf/go-mutexes v1.5.0
# codeberg.org/gruf/go-mutexes v1.5.1
## explicit; go 1.22.2
codeberg.org/gruf/go-mutexes
# codeberg.org/gruf/go-runners v1.6.2
@ -179,13 +179,6 @@ github.com/disintegration/imaging
# github.com/docker/go-units v0.5.0
## explicit
github.com/docker/go-units
# 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/dsoprea/go-exif/v3 v3.0.0-20210625224831-a6301f85c82b
## explicit; go 1.12
github.com/dsoprea/go-exif/v3