mitogen

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David Wilson e6a107c5aa core: replace Queue with Latch On Python 2.x, operations on pthread objects with a timeout set actually cause internal polling. When polling fails to yield a positive result, it quickly backs off to a 50ms loop, which results in a huge amount of latency throughout. Instead, give up using Queue.Queue.get(timeout=...) and replace it with the UNIX self-pipe trick. Knocks another 45% off my.yml in the Ansible examples directory against a local VM. This has the potential to burn a lot of file descriptors, but hell, it's not the 1940s any more, RAM is all but infinite. I can live with that. This gets things down to around 75ms per playbook step, still hunting for additional sources of latency.	7 years ago
..
__init__.py	ansible: restructure to avoid intermediate imports	7 years ago
mitogen.py	core: replace Queue with Latch	7 years ago

David Wilson e6a107c5aa core: replace Queue with Latch

On Python 2.x, operations on pthread objects with a timeout set actually
cause internal polling. When polling fails to yield a positive result,
it quickly backs off to a 50ms loop, which results in a huge amount of
latency throughout.

Instead, give up using Queue.Queue.get(timeout=...) and replace it with
the UNIX self-pipe trick. Knocks another 45% off my.yml in the Ansible
examples directory against a local VM.

This has the potential to burn a *lot* of file descriptors, but hell,
it's not the 1940s any more, RAM is all but infinite. I can live with
that.

This gets things down to around 75ms per playbook step, still hunting
for additional sources of latency.

__init__.py

ansible: restructure to avoid intermediate imports

mitogen.py

core: replace Queue with Latch