Re: select() efficiency / epoll

[Davy Durham]

Thanks for the info.. I did find this thread and was wondering if this 
patch ever got put in

http://www.ussg.iu.edu/hypermail/linux/kernel/0303.3/1139.html



Willy Tarreau wrote:

> On Tue, Aug 23, 2005 at 06:24:42AM -0500, Davy Durham wrote:
>  
>
> > That's probably a good idea.  Where would I find out what other projects 
> > use it?
> >    
>
> I use it in my load-balancer (haproxy), and it could somewhat match your
> needs, because I ported the select()-based earlier version to epoll() with
> the smallest possible changes. Indeed, the new epoll() loop still uses the
> FD_ISSET() to determine what to do with epoll_ctl(). If you have changed
> your code to use select(), you may find similarities. But I want to tell
> you from now that my code is NOT multi-threaded. It could be a bug in the
> epoll implementation, because I don't think that there are so many
> applications using epoll on MT models. Bert says that the epoll implementation
> is heavily benchmarked, which is true, but which does not guarantee that it
> is tested under every condition.
>
> You can download it from there :
>
>  http://w.ods.org/tools/haproxy/src/devel/
>
> Use version 1.2.6. I added epoll in 1.2.5, so the diff between 1.2.4 and
> 1.2.5 could help you too.
>
> Good luck !
> Willy
>
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