[Python-Dev] Support for async read/write

[Jesus Cea]

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On 20/10/10 00:58, Antoine Pitrou wrote:
> It would be nice to know about the use case Jesus has in mind.

I am thinking about the cases where a request come, you do some disk
read in behalf of it and you reply.

If the read is "slow" (if not cached, you have to deal with a physical
harddisk), you stop the main-loop for a while, unless you use threads.

If, instead, I can schedule a read and keep processing other requests
(possibly queueing new reads), be notified when the read is done and
complete the reply, I think this is more simple and performing (and far
less memory hungry) that using threads.

I just opened a issue, assigned to me. I plan to do the implementation
myself, at least for Solaris and possibly (recent) Linux:
<http://bugs.python.o rg/issue11117>.

Some people say AIO OS implementations are flaky. Well, you must deal
with it, like you deal with other flaky OS corners, like exhausting
memory or whatever.

I would suppose that if Python exposes AIO and in some OS support is
underpar, the exposing would incentivate a better support for OS. Like
happened to threads and linux years ago.

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