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Re: [pcp] question about the "root" PMDA

To: Lukas Berk <lberk@xxxxxxxxxx>, Ken McDonell <kenj@xxxxxxxxxxxxxxxx>
Subject: Re: [pcp] question about the "root" PMDA
From: Nathan Scott <nathans@xxxxxxxxxx>
Date: Wed, 23 Mar 2016 20:58:16 -0400 (EDT)
Cc: PCP <pcp@xxxxxxxxxxx>
Delivered-to: pcp@xxxxxxxxxxx
In-reply-to: <87h9fxl4lg.fsf@xxxxxxxxxx>
References: <56F21AC5.1020208@xxxxxxxxxxxxxxxx> <87h9fxl4lg.fsf@xxxxxxxxxx>
Reply-to: Nathan Scott <nathans@xxxxxxxxxx>
Thread-index: E3Vy5Wb1pB/Ba1nhsCgIyXwcJtZWuQ==
Thread-topic: question about the "root" PMDA
Hi guys,

----- Original Message -----
> Hi Ken,
> 
> Ken McDonell <kenj@xxxxxxxxxxxxxxxx> writes:
> > Can anyone explain this that I'm seeing on Mac OS X ...
> [...]
> > Specifically, ... why are there two pmdasimple processes, one launched by
> > pmcd and one launched by pmdaroot?
> > I've also seen (with an Internet socket), an old zombie pmdasimple
> > process that was launched by pmdaroot, so why is pmdaroot not watching
> > its children and harvesting them when they exit?

(not sure - it does harvest its children on Linux though, and should on
all platforms? - pmcd orchestrates this as part of its shutdown/restart
process via PDUs to pmdaroot)

> > This does not happen on Linux.
> 
> I can't (yet) test on Mac OSX, as I don't have PCP setup on a macbook
> that I was gifted for the buildbot.  I'm surprised that pmdaroot is
> installed on OSX though, I thought pmdaroot was supposed to be linux
> only at this point?

Its enabled on anything that has AF_UNIX, IIRC.

> Will take a closer look when I get a chance (and get PCP setup properly
> from sources).

cheers.

--
Nathan

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