[issue19506] subprocess.communicate() should use a memoryview

[STINNER Victor]

New submission from STINNER Victor:

The following code copies data, whereas the copy can be avoided using a memory view:

chunk = self._input[self._input_offset:self._input_offset + _PIPE_BUF]
self._input_offset += os.write(key.fd, chunk)

It should be replaced with:

input_view = memoryview(self._input)
...
chunk = input_view[self._input_offset:self._input_offset + _PIPE_BUF]
self._input_offset += os.write(key.fd, chunk)


This issue is a reminder for one of my comment of issue #18923.

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messages: 202240
nosy: haypo, neologix
priority: normal
severity: normal
status: open
title: subprocess.communicate() should use a memoryview
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue19506>
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