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From: Lloyd Zusman <ljz@asfast.com>
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Subject: When running ruby scripts, runsv tightly loops
Date: Sun, 07 Nov 2004 00:10:38 -0500
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I'm successfully using runit for managing a number of daemons.  However,
I have encountered a problem when the daemon is a ruby script.

It seems like no matter what the script is doing, the runsv process that
is managing the script seems to be running in a tight loop and taking up
a high percentage of my cpu.  This even occurs during a do-nothing ruby
program, such as the following:

  #!/usr/bin/ruby
  while true
    sleep(10)
  end

Assuming that this is called '/usr/local/bin/myscript', the 'run'
script looks like this:

  #!/bin/sh

  exec 2>&1

  exec /usr/local/bin/myscript

  exit 1

The 'myscript' process itself takes up a miniscule amount of resources;
only the 'runit' script which is managing it seems to be looping.

Has anyone else run into this problem with ruby scripts and runit?

By the way, I don't see this problem with python or perl scripts.

Could there be something about the ruby interpreter itself which could
be causing runsv to behave this way?  If so, can anyone suggest a
fix for this?

Thanks in advance.

-- 
 Lloyd Zusman
 ljz@asfast.com
 God bless you.