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parallel.go
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parallel.go
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package roaring
import (
"container/heap"
"runtime"
)
var defaultWorkerCount = runtime.NumCPU()
type bitmapContainerKey struct {
bitmap *Bitmap
container container
key uint16
idx int
}
type multipleContainers struct {
key uint16
containers []container
idx int
}
type keyedContainer struct {
key uint16
container container
idx int
}
type bitmapContainerHeap []bitmapContainerKey
func (h bitmapContainerHeap) Len() int { return len(h) }
func (h bitmapContainerHeap) Less(i, j int) bool { return h[i].key < h[j].key }
func (h bitmapContainerHeap) Swap(i, j int) { h[i], h[j] = h[j], h[i] }
func (h *bitmapContainerHeap) Push(x interface{}) {
// Push and Pop use pointer receivers because they modify the slice's length,
// not just its contents.
*h = append(*h, x.(bitmapContainerKey))
}
func (h *bitmapContainerHeap) Pop() interface{} {
old := *h
n := len(old)
x := old[n-1]
*h = old[0 : n-1]
return x
}
func (h bitmapContainerHeap) Peek() bitmapContainerKey {
return h[0]
}
func (h *bitmapContainerHeap) PopIncrementing() bitmapContainerKey {
k := h.Peek()
newIdx := k.idx + 1
if newIdx < k.bitmap.highlowcontainer.size() {
newKey := bitmapContainerKey{
k.bitmap,
k.bitmap.highlowcontainer.getWritableContainerAtIndex(newIdx),
k.bitmap.highlowcontainer.keys[newIdx],
newIdx,
}
(*h)[0] = newKey
heap.Fix(h, 0)
} else {
heap.Pop(h)
}
return k
}
func (h *bitmapContainerHeap) PopNextContainers() multipleContainers {
if h.Len() == 0 {
return multipleContainers{}
}
containers := make([]container, 0, 4)
bk := h.PopIncrementing()
containers = append(containers, bk.container)
key := bk.key
for h.Len() > 0 && key == h.Peek().key {
bk = h.PopIncrementing()
containers = append(containers, bk.container)
}
return multipleContainers{
key,
containers,
-1,
}
}
func newBitmapContainerHeap(bitmaps ...*Bitmap) bitmapContainerHeap {
// Initialize heap
var h bitmapContainerHeap = make([]bitmapContainerKey, 0, len(bitmaps))
for _, bitmap := range bitmaps {
if !bitmap.IsEmpty() {
key := bitmapContainerKey{
bitmap,
bitmap.highlowcontainer.getWritableContainerAtIndex(0),
bitmap.highlowcontainer.keys[0],
0,
}
h = append(h, key)
}
}
heap.Init(&h)
return h
}
func repairAfterLazy(c container) container {
switch t := c.(type) {
case *bitmapContainer:
if t.cardinality == invalidCardinality {
t.computeCardinality()
}
if t.getCardinality() <= arrayDefaultMaxSize {
return t.toArrayContainer()
} else if c.(*bitmapContainer).isFull() {
return newRunContainer16Range(0, MaxUint16)
}
}
return c
}
func toBitmapContainer(c container) container {
switch t := c.(type) {
case *arrayContainer:
return t.toBitmapContainer()
case *runContainer16:
if !t.isFull() {
return t.toBitmapContainer()
}
}
return c
}
func appenderRoutine(bitmapChan chan<- *Bitmap, resultChan <-chan keyedContainer, expectedKeysChan <-chan int) {
expectedKeys := -1
appendedKeys := 0
keys := make([]uint16, 0)
containers := make([]container, 0)
for appendedKeys != expectedKeys {
select {
case item := <-resultChan:
if len(keys) <= item.idx {
keys = append(keys, make([]uint16, item.idx-len(keys)+1)...)
containers = append(containers, make([]container, item.idx-len(containers)+1)...)
}
keys[item.idx] = item.key
containers[item.idx] = item.container
appendedKeys++
case msg := <-expectedKeysChan:
expectedKeys = msg
}
}
answer := &Bitmap{
roaringArray{
make([]uint16, 0, expectedKeys),
make([]container, 0, expectedKeys),
make([]bool, 0, expectedKeys),
false,
nil,
},
}
for i := range keys {
answer.highlowcontainer.appendContainer(keys[i], containers[i], false)
}
bitmapChan <- answer
}
// ParOr computes the union (OR) of all provided bitmaps in parallel,
// where the parameter "parallelism" determines how many workers are to be used
// (if it is set to 0, a default number of workers is chosen)
func ParOr(parallelism int, bitmaps ...*Bitmap) *Bitmap {
bitmapCount := len(bitmaps)
if bitmapCount == 0 {
return NewBitmap()
} else if bitmapCount == 1 {
return bitmaps[0].Clone()
}
if parallelism == 0 {
parallelism = defaultWorkerCount
}
h := newBitmapContainerHeap(bitmaps...)
bitmapChan := make(chan *Bitmap)
inputChan := make(chan multipleContainers, 128)
resultChan := make(chan keyedContainer, 32)
expectedKeysChan := make(chan int)
orFunc := func() {
// Assumes only structs with >=2 containers are passed
for input := range inputChan {
c := toBitmapContainer(input.containers[0]).lazyOR(input.containers[1])
for _, next := range input.containers[2:] {
c = c.lazyIOR(next)
}
c = repairAfterLazy(c)
kx := keyedContainer{
input.key,
c,
input.idx,
}
resultChan <- kx
}
}
go appenderRoutine(bitmapChan, resultChan, expectedKeysChan)
for i := 0; i < parallelism; i++ {
go orFunc()
}
idx := 0
for h.Len() > 0 {
ck := h.PopNextContainers()
if len(ck.containers) == 1 {
resultChan <- keyedContainer{
ck.key,
ck.containers[0],
idx,
}
} else {
ck.idx = idx
inputChan <- ck
}
idx++
}
expectedKeysChan <- idx
bitmap := <-bitmapChan
close(inputChan)
close(resultChan)
close(expectedKeysChan)
return bitmap
}
// ParAnd computes the intersection (AND) of all provided bitmaps in parallel,
// where the parameter "parallelism" determines how many workers are to be used
// (if it is set to 0, a default number of workers is chosen)
func ParAnd(parallelism int, bitmaps ...*Bitmap) *Bitmap {
bitmapCount := len(bitmaps)
if bitmapCount == 0 {
return NewBitmap()
} else if bitmapCount == 1 {
return bitmaps[0].Clone()
}
if parallelism == 0 {
parallelism = defaultWorkerCount
}
h := newBitmapContainerHeap(bitmaps...)
bitmapChan := make(chan *Bitmap)
inputChan := make(chan multipleContainers, 128)
resultChan := make(chan keyedContainer, 32)
expectedKeysChan := make(chan int)
andFunc := func() {
// Assumes only structs with >=2 containers are passed
for input := range inputChan {
c := input.containers[0].and(input.containers[1])
for _, next := range input.containers[2:] {
c = c.iand(next)
}
kx := keyedContainer{
input.key,
c,
input.idx,
}
resultChan <- kx
}
}
go appenderRoutine(bitmapChan, resultChan, expectedKeysChan)
for i := 0; i < parallelism; i++ {
go andFunc()
}
idx := 0
for h.Len() > 0 {
ck := h.PopNextContainers()
if len(ck.containers) == bitmapCount {
ck.idx = idx
inputChan <- ck
idx++
}
}
expectedKeysChan <- idx
bitmap := <-bitmapChan
close(inputChan)
close(resultChan)
close(expectedKeysChan)
return bitmap
}