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gh-91487: Optimize asyncio UDP speed (GH-91488)

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Fix #91487

When transferring a small file, e.g. 256 KiB, the speed of this PR is comparable. However, if a large file, e.g. 65536 KiB, is transferred, asyncio UDP will be over 100 times faster than the original. The speed is presumably significantly faster if a larger file is transferred, e.g. 1048576 KiB.

Automerge-Triggered-By: GH:gpshead
This commit is contained in:
msoxzw 2022-04-15 19:59:01 +00:00 • committed by GitHub
parent c9e231de85
commit 42fabc3ea7
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3 changed files with 10 additions and 2 deletions
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6
Lib/asyncio/selector_events.py
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@ -1131,6 +1131,7 @@ class _SelectorDatagramTransport(_SelectorTransport):
waiter=None, extra=None):
super().__init__(loop, sock, protocol, extra)
self._address = address
self._buffer_size = 0
self._loop.call_soon(self._protocol.connection_made, self)
# only start reading when connection_made() has been called
self._loop.call_soon(self._add_reader,
@ -1141,7 +1142,7 @@ class _SelectorDatagramTransport(_SelectorTransport):
waiter, None)
def get_write_buffer_size(self):
return sum(len(data) for data, _ in self._buffer)
return self._buffer_size
def _read_ready(self):
if self._conn_lost:
@ -1200,11 +1201,13 @@ class _SelectorDatagramTransport(_SelectorTransport):
# Ensure that what we buffer is immutable.
self._buffer.append((bytes(data), addr))
self._buffer_size += len(data)
self._maybe_pause_protocol()
def _sendto_ready(self):
while self._buffer:
data, addr = self._buffer.popleft()
self._buffer_size -= len(data)
try:
if self._extra['peername']:
self._sock.send(data)
@ -1212,6 +1215,7 @@ class _SelectorDatagramTransport(_SelectorTransport):
self._sock.sendto(data, addr)
except (BlockingIOError, InterruptedError):
self._buffer.appendleft((data, addr)) # Try again later.
self._buffer_size += len(data)
break
except OSError as exc:
self._protocol.error_received(exc)