OSX processor usage

[Andreas Ericsson]

William Preston wrote:
> Hi Jonathan, hi list
> 
> On  Sep17, 2008, at 06:26, saggau wrote:
> 
>> I ran into a (possible) bug in OS X 10.5.4, which I tracked-down to
>> poll() never timing out in the cmd file worker thread on that
>> platform.  It looks like poll() always returns 1, whether there is
>> data on the pipe or not.  A quick fix that shouldn't break Nagios on
>> other platforms and which doesn't require any configure checking of
>> poll() is to manually pause if poll() returns 1 with an empty pipe.
> 
> 
> yes, this is a known problem.
> the continuous polling drives the load to 100%...
> 
> I posted a simple patch for this to
> http://blog.netways.de/2008/08/15/nagios-unter-mac-os-x-installieren/
> (the article is in german, but there is an english comment with the  
> patch).
> 
> @list:
> I vaguely seem to remember there was a reason why select() isn't used.
> 
> Was this a solaris issue?
> 

I can't remember, but the issue seemed to be worse with select() than
with poll. I'll make a patch for it that wraps the poll() call and makes
it use select() on systems where that's needed. It's probably about time
we introduce compat.[ch] to Nagios anyways.

-- 
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

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