[zeromq-dev] Windows and IOCP

Steven McCoy steven.mccoy at miru.hk
Sun May 15 15:33:40 CEST 2011

On 15 May 2011 03:43, Martin Sustrik <sustrik at 250bpm.com> wrote:

> On 05/15/2011 05:19 AM, Steven McCoy wrote:
>  If you're doing it right, it is all zero copy so all the buffers should
>> be in ZeroMQ or the application.
> Aha. So there's a callback notifying the application that the data were
> already sent. The application is then responsible for deallocating the
> buffer. Right?
> Yup, that's the 'C' in IOCP.

> In such case I would recommend taking care of having at most one send() per
> connection on the fly.
> Most IOCP users have found one pending send call and one or more receive
calls to be optimal.

> That way the pending mesages are owned by 0MQ (meaning that HWM is properly
> observed) rather than by IOCP.
> Correct, as you also cut SO_SNDBUF to 0 you end up with much better control
of HWM than pre-IOCP.

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