Asynchronous TCP with fwrite: limited bandwidth compared to synchronous communication

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Tom DeLonge 2019-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/452503-asynchronous-tcp-with-fwrite-limited-bandwidth-compared-to-synchronous-communication

评论： Tom DeLonge 2019-4-1

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When using, e.g.

fwrite(tcpSocket, tcpData, 'uint8', 'async')

I notice that the maximum datarate I can achieve is about 4MBit/s, regardless of buffer size/chunk size. When making use of synchronous fwrite, I easily achieve datarates up to 100MBit/s.

I would prefer to stick to asyncronous writing, since my code is embedded in a GUI that should remain responsive while the data transfer runs in the background. Also the remote tcp side (which is the server in my case) reads data very fast.

Thanks!

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Tom DeLonge 2019-3-27

I just noticed that other people receiving data have the same problem: https://www.mathworks.com/matlabcentral/answers/115670-how-can-i-get-higher-throughput-using-fread-with-tcpip

Tom DeLonge 2019-4-1

If someone else stumbles upon this. I sent an inquiry to Mathworks and got a reply. They could sucessfully reproduce the problem. They suggested to use parfeval to execute fwrite in the background (without the async argument).

This approach undermines bilateral communication or at least makes it very inconvenient. So I'll try another approach.

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