New submission from Adam Meily:
I am working on a Python 3.5 project that uses asyncio on a Windows system to
poll both UDP and TCP connections. Multiple sources online say that the Windows
Proactor event loop, which uses I/O Completion Ports, is considerably faster
and more efficient than the default Selector event loop. I'm using both UDP and
TCP connections so I am stuck with the Selector event loop for the time being.
I've seen the overhead of 128 open UDP/TCP connections on the Selector event
loop to be near 85%, which I understand is entirely spent in Windows
proprietary code and not the Python implementation.
I'd like to take a shot at implementing UDP support in the IOCP event loop. It
looks like there will be a considerable amount of code shared between TCP and
UDP IOCP so I plan on implementing UDP support directly in
_ProactorReadPipeTransport and _ProactorBaseWritePipeTransport. I should be
able to do this by wrapping any TCP/UDP specific function calls in a check of:
if sock.type == socket.SOCK_DGRAM:
# Do UDP stuff
elif sock.type == socket.SOCK_STREAM:
# Do TCP stuff
My initial implementation plan is to:
- Call datagram_received() instead of data_received() when UDP data is
available in _ProactorReadPipeTransport._loop_reading().
- Implement BaseProactorEventLoop._make_datagram_transport().
- Implement wrappers for WSAConnect, WSARecvFrom, and WSASendTo in _overlapped.
- Implement sendto() and recvfrom() in IocpProactor, which will use the new
functions in _overlapped.
- Implement handling for UDP "connections" in IocpProactor.connect() to call
WSAConnect(). WSAConnect() appears to always return immediately so the function
not supporting IOCP shouldn't be an issue. We can't use ConnectEx() for UDP
because ConnectEx() is for connection-oriented sockets only.
My project is unfortunately tied to Python 3.5. So, if possible, I'd like to
have UDP support merged into a v3.5 release. I can fork off of master instead
of v3.5.3 if Python 3.5 support isn't an option.
----------
components: asyncio
messages: 290010
nosy: Adam Meily, yselivanov
priority: normal
severity: normal
status: open
title: asyncio: Windows Proactor Event Loop UDP Support
type: enhancement
versions: Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue29883>
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