From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2010-04-07T16:50:35+09:00
Subject: Re: Maximum number of sockets

On Tue, Apr 6, 2010 at 10:33 PM, Brian Candler <b.candler@pobox.com> wrote:
> I'd have thought that you'd hit a limit of 1024 because of fd_set (man
> select). When I run your code, it stops after 1021 with:
>
> in `initialize': Too many open files - socket(2) (Errno::EMFILE)
>
> This is ruby 1.8.7 (2009-06-12 patchlevel 174) [i486-linux]
> from Karmic.

Did you increase the ulimit for file descriptors for your process (I
did ulimit -n 50000)?

> I suspect you have managed to go 8 bytes beyond the limit (1024+64=1088)
> before overwriting something important and killing the ruby interpreter
> - presumably the newer 1.8.7 I have fixes this.
>
> To go beyond this limit you may need to use something like eventmachine
> which uses poll/epoll instead of select.

But who is calling select in my code? I'll take a look at the
implementation of the socket class, although my C is a bit rusty. I
just create the sockets and connect to a server, I don't want to read
from them or anything (yet).

Jesus.