Hi,
I noticed lately a couple of threads on the puppet-users list about the
puppetmaster processes taking 100% CPU for an unknown reasons.
There might be a bug there, which we have to find, but the real issue I
think is that we don't really know what a given process is doing at a
given time (and that's also true for apparently stuck puppetd).
I was thinking about abusing the process name to display what the
process is currently doing ala:
puppet master: compiling node.masterzen.fr since 0.2s
or
puppet master: serving metadata for /modules/mysql/mysql.cnf
or
puppet agent: exec /usr/bin/apt-get update
This is quite easy to add in an (almost) unobtrusely(?) way to the
puppet core. My idea would be that we could trigger this functionality
by firing USR1 (or whatever signal) to the process (the feature being
inactive by default).
In terms of use in the code, I was thinking about something like
(pseudo-ruby-code):
class ...
include ProcessNameIntrumentation
...
def compile(node)
instrument("compiling #{node}") do
# normal process compilation
end
end
end
It's still yet unknown how I can display the "since 0.2s" part, which
would require a thread (but with MRI green thread implementations this
part might not change).
There's also the question about what to do for multiple inner
instrumentation like:
instrument("compiling #{node}") do
instrument("parsing file #{file}") do
..
end
instrument("evaluating #{klass}") do
end
end
I originally planed to concatenate all the strings, but something
ultra-über-cool would be to have a kind of ticker things that "scrolls"
the long string (so that in top or by using watch you can see the thing
really scrolling).
My plan is to work on this during the next (rainy) week-end, but I
thought I should first ask if the idea sounds as cool/useful as I think
and/or if the usage is as unobstrusive as I think.
In short: is this a good idea? is there a better solution?
--
Brice Figureau
Follow the latest Puppet Community evolutions on www.planetpuppet.org!
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