Re: select() efficiency / epoll

From: Davy Durham (pubaddr2_at_davyandbeth.com)
Date: 08/23/05

  • Next message: Ulrich Drepper: "mremap() use is racy" 
    Date:	Tue, 23 Aug 2005 06:55:26 -0500
To: Willy Tarreau <willy@w.ods.org>

    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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