mirror of
https://gitee.com/milvus-io/milvus.git
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127 lines
2.9 KiB
Go
127 lines
2.9 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package funcutil
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import (
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"reflect"
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"runtime"
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"sync"
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"time"
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"github.com/milvus-io/milvus/internal/log"
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"go.uber.org/zap"
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)
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// GetFunctionName returns the name of input
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func GetFunctionName(i interface{}) string {
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return runtime.FuncForPC(reflect.ValueOf(i).Pointer()).Name()
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}
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// ProcessFuncParallel process function in parallel.
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//
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// ProcessFuncParallel waits for all goroutines done if no errors occur.
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// If some goroutines return error, ProcessFuncParallel cancels other goroutines as soon as possible and wait
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// for all other goroutines done, and returns the first error occurs.
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// Reference: https://stackoverflow.com/questions/40809504/idiomatic-goroutine-termination-and-error-handling
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func ProcessFuncParallel(total, maxParallel int, f func(idx int) error, fname string) error {
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if maxParallel <= 0 {
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maxParallel = 1
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}
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t := time.Now()
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defer func() {
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log.Debug(fname, zap.Any("time cost", time.Since(t)))
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}()
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nPerBatch := (total + maxParallel - 1) / maxParallel
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log.Debug(fname, zap.Any("total", total))
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log.Debug(fname, zap.Any("nPerBatch", nPerBatch))
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quit := make(chan bool)
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errc := make(chan error)
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done := make(chan error)
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getMin := func(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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routineNum := 0
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var wg sync.WaitGroup
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for begin := 0; begin < total; begin = begin + nPerBatch {
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j := begin
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wg.Add(1)
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go func(begin int) {
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defer wg.Done()
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select {
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case <-quit:
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return
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default:
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}
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err := error(nil)
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end := getMin(total, begin+nPerBatch)
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for idx := begin; idx < end; idx++ {
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err = f(idx)
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if err != nil {
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log.Debug(fname, zap.Error(err), zap.Any("idx", idx))
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break
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}
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}
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ch := done // send to done channel
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if err != nil {
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ch = errc // send to error channel
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}
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select {
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case ch <- err:
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return
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case <-quit:
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return
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}
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}(j)
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routineNum++
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}
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log.Debug(fname, zap.Any("NumOfGoRoutines", routineNum))
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if routineNum <= 0 {
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return nil
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}
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count := 0
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for {
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select {
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case err := <-errc:
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close(quit)
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wg.Wait()
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return err
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case <-done:
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count++
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if count == routineNum {
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wg.Wait()
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return nil
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}
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}
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}
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}
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