Optimize asyncio.gather()

[1st1]

BPO	32355
Nosy	@asvetlov, @1st1
PRs	bpo-32355: Optimize asyncio.gather() #4913
Files	t.py

^{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 = 'https://github.com/1st1'
closed_at = <Date 2017-12-19.12:20:10.931>
created_at = <Date 2017-12-18.02:41:07.785>
labels = ['expert-asyncio', '3.7', 'performance']
title = 'Optimize asyncio.gather()'
updated_at = <Date 2017-12-19.12:20:10.930>
user = 'https://github.com/1st1'

bugs.python.org fields:

activity = <Date 2017-12-19.12:20:10.930>
actor = 'yselivanov'
assignee = 'yselivanov'
closed = True
closed_date = <Date 2017-12-19.12:20:10.931>
closer = 'yselivanov'
components = ['asyncio']
creation = <Date 2017-12-18.02:41:07.785>
creator = 'yselivanov'
dependencies = []
files = ['47336']
hgrepos = []
issue_num = 32355
keywords = ['patch']
message_count = 2.0
messages = ['308508', '308632']
nosy_count = 2.0
nosy_names = ['asvetlov', 'yselivanov']
pr_nums = ['4913']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'performance'
url = 'https://bugs.python.org/issue32355'
versions = ['Python 3.7']

[1st1]

asyncio.gather can be made faster if:

1. we don't use functools.partial
2. create less intermittent collections
3. drop unnecessary code (e.g. gather has some code that's duplicated in ensure_future that it uses etc)

The proposed PR makes asyncio.gather 10-15% faster on the attached benchmark.

[1st1]

New changeset 36c2c04 by Yury Selivanov in branch 'master':
bpo-32355: Optimize asyncio.gather() (bpo-4913)
36c2c04