multiprocessing: micro-optimize Connection.send_bytes() method

[animalize]

BPO	47199
Nosy	@animalize
PRs	bpo-47199: multiprocessing: micro-optimize Connection.send_bytes() method #32247

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2022-04-02.06:28:23.157>
labels = ['3.11', 'library', 'performance']
title = 'multiprocessing: micro-optimize Connection.send_bytes() method'
updated_at = <Date 2022-04-02.06:29:49.762>
user = 'https://github.com/animalize'

bugs.python.org fields:

activity = <Date 2022-04-02.06:29:49.762>
actor = 'malin'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2022-04-02.06:28:23.157>
creator = 'malin'
dependencies = []
files = []
hgrepos = []
issue_num = 47199
keywords = ['patch']
message_count = 1.0
messages = ['416538']
nosy_count = 1.0
nosy_names = ['malin']
pr_nums = ['32247']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue47199'
versions = ['Python 3.11']

[animalize]

bytes(m) can be replaced by memoryview.cast('B'), then no need for data copying.

        m = memoryview(buf)
        # HACK for byte-indexing of non-bytewise buffers (e.g. array.array)
        if m.itemsize > 1:
            m = memoryview(bytes(m))
        n = len(m)

https://github.com/python/cpython/blob/v3.11.0a6/Lib/multiprocessing/connection.py#L190-L194