Re: [Mod-pubsub-developer] port to twisted

[Alex R. <al...@ne...>]

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On Friday 26 March 2004 6:02 pm, George Schlossnagle wrote:
> On Mar 26, 2004, at 7:06 PM, BC Sittler wrote:
> > Just to be sure I understand... there is a kqueue [*bsd] reactor
> > already in twisted, but not one for epoll [linux], right? And
> > Joyce needs one for Linux?
>
> Just fyi, the epoll backport to 2.4 is slightly flaky (will build
> products that exploit that target that patch).  Even without epoll,
> the poll reactor will give you the scalability you need.

I have no doubt that poll() will do the job, but as to whether or not=20
poll() will induce high latency with a huge number of long-lived=20
clients, I'm not sure:

http://lse.sf.net/epoll/index.html#compare

Solaris added /dev/poll for many of the same reasons that Linux has=20
added epoll and FreeBSD kqueue/kevent. It's just another step in the=20
research-driven evolution of Unix in general. Select breaks down well=20
before poll when faced with lots of connnections, but with 10K active=20
clients, it's not unreasonable to expect even poll()'s O(changed FDs)=20
performance to get problematic.

>  Either way, adding an epoll reactor should not be terribly=20
> difficult though.

Agreed.

Regards

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Alex Russell
al...@bu...   BD10 7AFC 87F6 63F9 1691 83FA 9884 3A15 AFC9 61B7
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