From: fkattan@...
Date: 2007-08-01T11:09:59+09:00
Subject: Re: DRb throws Errno::EMFILE "Too many open files" with 256 connections

On Jul 28, 6:38 am, Blaine Cook <rom...@gmail.com> wrote:
> As it turns out, I was having this problem until your post made me
> realize that it was solaris (and not my program, as I had assumed).
> Some research turn this up:
>
> http://developers.sun.com/solaris/articles/stdio_256.html
>
> which says that 32-bit applications are limited to 256 file
> descriptors when running under Solaris, unless you do the following:
>
> export LD_PRELOAD_32=/usr/lib/extendedFILE.so.1
>
> before running your program. Ruby on Solaris is a 32 bit app (we've
> never had it compile cleanly as a 64 bit application), so this makes
> sense. Except for the part about the limit of 256 file descriptors.
> But oh well!
>
> cheers,
>
> b.
>
> fkat...@gmail.com wrote:
> > Hi,
>
> > I have a ruby / DRb process that is quiting with Errno::EMFILE every
> > time it reaches 256 connections. This happens regardless of what I set
> > in ulimit -n and only on Solaris.
>
> > /opt/csw/lib/ruby/1.8/drb/drb.rb:944:in `accept': Too many open files
> > (Errno::EMFILE)
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:944:in `accept'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1581:in `main_loop'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1430:in `run'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1427:in `start'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1427:in `run'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1347:in `initialize'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1627:in `new'
> >         from /opt/csw/lib/ruby/1.8/drb/drb.rb:1627:in `start_service'
> >         from ./tuple_space.sh:10
>
> > I also tried this test both in OSX and Solaris:
>
> >  255.times {a<<File.open("/etc/hosts")}
>
> > and I got it working on OSX with a ulimit -n 2048 but it seems that
> > Ruby on Solaris does not change its behavior based on ulimit -n and it
> > still throws:
>
> > Errno::EMFILE: Too many open files - /etc/hosts
> >         from (irb):17:in `initialize'
> >         from (irb):17:in `open'
> >         from (irb):17
> >         from (irb):17:in `times'
> >         from (irb):17
>
> > Anyone has any insight on how to get Solaris to open more than 256
> > files?
>
> > Thanks in advance.

Thanks Blaine, .. this works !!.