mirror of
https://github.com/rocky-linux/peridot.git
synced 2024-11-01 04:41:22 +00:00
102 lines
2.2 KiB
Go
102 lines
2.2 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
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 workqueue
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
|
|
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
|
|
)
|
|
|
|
type DoWorkPieceFunc func(piece int)
|
|
|
|
type options struct {
|
|
chunkSize int
|
|
}
|
|
|
|
type Options func(*options)
|
|
|
|
// WithChunkSize allows to set chunks of work items to the workers, rather than
|
|
// processing one by one.
|
|
// It is recommended to use this option if the number of pieces significantly
|
|
// higher than the number of workers and the work done for each item is small.
|
|
func WithChunkSize(c int) func(*options) {
|
|
return func(o *options) {
|
|
o.chunkSize = c
|
|
}
|
|
}
|
|
|
|
// ParallelizeUntil is a framework that allows for parallelizing N
|
|
// independent pieces of work until done or the context is canceled.
|
|
func ParallelizeUntil(ctx context.Context, workers, pieces int, doWorkPiece DoWorkPieceFunc, opts ...Options) {
|
|
if pieces == 0 {
|
|
return
|
|
}
|
|
o := options{}
|
|
for _, opt := range opts {
|
|
opt(&o)
|
|
}
|
|
chunkSize := o.chunkSize
|
|
if chunkSize < 1 {
|
|
chunkSize = 1
|
|
}
|
|
|
|
chunks := ceilDiv(pieces, chunkSize)
|
|
toProcess := make(chan int, chunks)
|
|
for i := 0; i < chunks; i++ {
|
|
toProcess <- i
|
|
}
|
|
close(toProcess)
|
|
|
|
var stop <-chan struct{}
|
|
if ctx != nil {
|
|
stop = ctx.Done()
|
|
}
|
|
if chunks < workers {
|
|
workers = chunks
|
|
}
|
|
wg := sync.WaitGroup{}
|
|
wg.Add(workers)
|
|
for i := 0; i < workers; i++ {
|
|
go func() {
|
|
defer utilruntime.HandleCrash()
|
|
defer wg.Done()
|
|
for chunk := range toProcess {
|
|
start := chunk * chunkSize
|
|
end := start + chunkSize
|
|
if end > pieces {
|
|
end = pieces
|
|
}
|
|
for p := start; p < end; p++ {
|
|
select {
|
|
case <-stop:
|
|
return
|
|
default:
|
|
doWorkPiece(p)
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
}
|
|
wg.Wait()
|
|
}
|
|
|
|
func ceilDiv(a, b int) int {
|
|
return (a + b - 1) / b
|
|
}
|