#goroutine

Achieving concurrency in Go

Published at April 6, 2019 ·  1 min read

Golang 中的 concurrency。关于 thread 与 goroutine 的对比较为详细。 线程/ thread 协程 / goroutine 系统的线程是由内核管理,有硬件依赖 goroutines 通过 Go 运行时管理,没有硬件依赖 系统线程通常有 1-2 MB 大小的固定堆栈 goroutines 在最新版的 Go 中通常是 8kb 大小的堆栈 堆栈大小在编译时及被决定,并且不能增加 堆栈大小由运行时进行管理,通过释放和分配新的堆栈可以增加到 1GB 在线程间没有方便的通信媒介 goroutine 通过 channels 进行低延时通信 (read more). 线程具有唯一的身份. 通过线程ID(TID)辨别在进程中的每个线程 goroutine 并没有任何唯一身份识别. 因为 Go 没有线程本地存储 TLS(Thread Local Storage). 线程有非常显著的创建和销毁成本,创建时需要向系统申请大量资源,并在销毁时将资源返还 goroutines 则是在运行时进行创建和销毁,这些操作相比于线程成本很低,因为 Go 运行时为 goroutines 维护了一个线程池....


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