Golang pipline泛型管道和类型管道的性能差距

FredricZhu · · 661 次点击 · · 开始浏览

这是一个创建于的文章，其中的信息可能已经有所发展或是发生改变。

pips/generic.go

//generic
package pips

type Generic struct {
}

func NewGeneric() *Generic {
    generic := &Generic{}
    return generic
}

func (generic *Generic) Repeat(
    done <-chan interface{},
    args ...interface{},
) <-chan interface{} {
    valueStream := make(chan interface{})
    go func() {
        defer close(valueStream)
        for {
            for _, v := range args {
                select {
                case <-done:
                    return
                case valueStream <- v:
                }
            }
        }
    }()
    return valueStream
}

func (generic *Generic) Take(
    done <-chan interface{},
    valueStream <-chan interface{},
    num int,
) <-chan interface{} {
    takeStream := make(chan interface{})

    go func() {
        defer close(takeStream)
        for i := 0; i < num; i++ {
            select {
            case <-done:
                return
            case takeStream <- <-valueStream:
            }
        }
    }()
    return takeStream
}

func (generic *Generic) ToString(
    done <-chan interface{},
    valueStream <-chan interface{},
) <-chan string {
    stringStream := make(chan string)
    go func() {
        defer close(stringStream)
        for i := range valueStream {
            select {
            case <-done:
                return
            case stringStream <- i.(string):
            }
        }
    }()
    return stringStream
}

pips/typed.go

// typed
package pips

type Typed struct {
}

func NewTyped() *Typed {
    typed := &Typed{}
    return typed
}

func (typed *Typed) Repeat(
    done <-chan interface{},
    args ...string,
) <-chan string {
    valueStream := make(chan string)
    go func() {
        defer close(valueStream)
        for {
            for _, v := range args {
                select {
                case <-done:
                    return
                case valueStream <- v:
                }
            }
        }

    }()
    return valueStream
}

func (typed *Typed) Take(
    done <-chan interface{},
    valueStream <-chan string,
    num int,
) <-chan string {
    takeStream := make(chan string)
    go func() {
        defer close(takeStream)
        for i := 0; i < num; i++ {
            select {
            case <-done:
                return
            case takeStream <- <-valueStream:
            }
        }
    }()
    return takeStream
}

pipline4_test.go

package main

import (
    pips "pipline4/pips"
    "testing"
)

func BenchmarkGeneric(b *testing.B) {
    generic := pips.NewGeneric()
    done := make(chan interface{})
    defer close(done)

    b.ResetTimer()
    for range generic.ToString(done, generic.Take(done, generic.Repeat(done, "a"), b.N)) {
    }
}

func BenchmarkTyped(b *testing.B) {
    typed := pips.NewTyped()
    done := make(chan interface{})
    defer close(done)

    b.ResetTimer()
    for range typed.Take(done, typed.Repeat(done, "a"), b.N) {
    }
}

运行结果如下图所示，表明泛型管道和类型管道的性能差距大概在 50%。也就是700ms左右，几乎可以忽略不记。