multithreading - 异步代码 + Async.RunSynchronously 与普通同步代码

Question

如果我有这样的代码:

let asyncReadToEnd (stream:Stream) = async {
  // Allocate 4kb buffer for downloading data
  let buffer = Array.zeroCreate (4 * 1024)
  use output = new MemoryStream()
  let reading = ref true

  while reading.Value do
    // Download one (at most) 4kb chunk and copy it
    let! count = stream.AsyncRead(buffer, 0, buffer.Length)
    output.Write(buffer, 0, count)
    reading := count > 0

  // Read all data into a string
  output.Seek(0L, SeekOrigin.Begin) |> ignore

  use sr = new StreamReader(output)
  return sr.ReadToEnd() 
}

use stream = httpResponse.GetResponseStream()
asyncReadToEnd stream |> Async.RunSynchronously

与简单的做相比，我有什么收获吗

use stream = httpResponse.GetResponseStream()
use sr = new StreamReader(stream)
sr.ReadToEnd()

在这两种情况下，我都会阻塞当前线程，但是使用第一个版本在释放线程资源方面是否还有任何优势？

Answer 1

只要您在每个 async 工作流上使用 Async.RunSynchronously，您就一无所获。您需要编写一个完全异步的程序来利用它。然后你就可以同时做 10,000 个了。