#61 ✓resolved

thin start stop abnormaly

Reported by Sylvain | April 9th, 2008 @ 04:42 PM | in 1.0

I'm trying to use Thin as my rails webserver on a Synology NAS.

the server is put on a chrooted debian.

When the server is started, I have the following error:

>> Using rails adapter

>> Thin web server (v0.8.0 codename Dodgy Dentist)

>> Threaded mode OFF

>> Maximum connections set to 1024

>> Listening on, CTRL+C to stop

terminate called after throwing an instance of 'std::runtime_error'

what(): unable to create epoll descriptor: Function not implemented


uname -a:

Linux DiskStation 2.6.15 #571 Sat Feb 2 01:53:35 CST 2008 ppc GNU/Linux

debian version:


Comments and changes to this ticket

  • macournoyer

    macournoyer April 9th, 2008 @ 04:52 PM

    • Milestone set to 0.8.1
    • State changed from “new” to “open”

    that is weird, looks like epoll is not available or something.

    Can you try to install latest version of eventmachine?

    sudo gem install eventmachine --source http://code.macournoyer.com

  • Sylvain

    Sylvain April 10th, 2008 @ 03:51 PM

    I installed eventmachine 0.10 but still the same issue.

    Is it because I'm chrooted?

    what is supposed to give epoll? glib?

  • macournoyer

    macournoyer April 10th, 2008 @ 04:24 PM


    sudo gem install eventmachine --source http://code.macournoyer.com

    should install EventMachine 0.11.0

    check you have 0.11.0:

    gem list -l eventmachine

    Are the thin and EM gems under the new root? I don't know a lot about chroot, but I think you need to link all required libraries under the new root. But epoll is built inside the kernel.

    Maybe you have an old kernel, epoll was added in 2.6, what's your kernel version? run:

    uname -r

    If that's the problem, I can add an option to disable epoll and fallback to poll which is not as fast but is implemented since a long time I think.

  • Sylvain

    Sylvain April 11th, 2008 @ 02:17 AM

    Oops, sorry, didn't see the " --source http://code.macournoyer.com" first time.

    The chroot is "complete" because it's a complete debian, except the Kernel which is retrieved from the underlying system.

    But my Kernel is a 2.6.15.

    I don't know if epoll() is an option to this kernel, so I'll try to see that.

  • Sylvain

    Sylvain April 18th, 2008 @ 11:43 AM


    sorry for the delay

    It doesn't work even with the last version of eventmachine

    I have "epoll.h" in the chrooted environment but because I use the non-chrooted kernel, it's pretty useless.

    I've sent a email to know if epoll is supported by the kernel.


  • macournoyer

    macournoyer April 18th, 2008 @ 10:44 PM

    Can you try applying this patch that disable epoll.

    Go to your Thin gem installation dir (something like /usr/local/lib/ruby/gems/1.8/gems/thin-*


    patch -p0 < disable-epoll.diff

    Let me know if this fix it

  • macournoyer
  • Sylvain

    Sylvain April 19th, 2008 @ 04:24 AM

    That works now without epoll

  • macournoyer

    macournoyer April 20th, 2008 @ 08:02 PM

    • Milestone changed from 0.8.1 to 0.8.2

    cool! I'll add an option to disable epoll then

  • macournoyer

    macournoyer July 1st, 2008 @ 09:44 AM

    • Tag set to error, rails
    • Milestone changed from 0.8.2 to 1.0
  • macournoyer

    macournoyer July 13th, 2008 @ 11:43 PM

    • State changed from “open” to “resolved”

    (from [37fbf1d50876315d94865e6ad44c4ac4d9840599]) Add --no-epoll option to disable epoll usage on Linux [#61 state:resolved]


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