From mboxrd@z Thu Jan  1 00:00:00 1970
From: philsnow@gmail.com (Phil Snowberger)
Date: Sun, 11 Nov 2007 19:49:55 -0500
Subject: [sup-talk] ruby/sup causing lots of wakeups-from-idle
Message-ID: <6ab4c98f0711111649o3e06c24aq73750c99bc4af248@mail.gmail.com>

I was wondering if anybody else has a problem with sup/ruby causing
lots of wakeups-from-idle?  The following line comes from the output
of powertop on my thinkpad:

...
  20.6% ( 94.8)              ruby : do_nanosleep (hrtimer_wakeup)
...

That is, there are ~94.8 wakeups-from-idle per second occuring because
ruby is do_nanosleep'ing a lot.  Is there any workaround for this?
Cursory searching seems to indicate that lots of wakeups can be caused
by doing usleep()s instead of select()/poll().  I'm trying to save as
much battery power as possible, and I currently leave sup off until I
want to check my email, which introduces startup time, etc.

I could just run it on some other host and access it with ssh, but for
a few reasons (mostly not wanting to do X forwarding), I'd like to try
getting ruby/sup to behave a little better.

Thanks,
--Phil