monitoring ruby app memory usage with passenger-recycler (was: Cannot require library for passenger in ruby)

[Karli Sjöberg]

On Thu, 2018-02-22 at 07:50 +0100, Karli Sjöberg via freebsd-ports
wrote:
> On Tue, 2018-02-20 at 21:31 +0000, Marcin Cieslak wrote:
> > On Mon, 19 Feb 2018, Karli Sjöberg wrote:
> > 
> > > > What is the tool you are trying to deploy? foreman_maintain?
> > 
> > Sorry, I was too quick. This foreman_main is used to
> > download/update
> > foreman
> > from RedHat Satellite servers, which is not what you want.
> 
> Well, I want the "foreman_maintain" package, which includes
> "passenger-
> recycler", so I guess I do want it :)
> 
> > 
> > However, the passenger-recycler script is a standalone script which
> > could possibly used with this little fix:
> 
> Ooh, awesome! Yeah, should´ve figured since it´s only at 0.1.3 :)
> 
> > 
> > https://github.com/theforeman/foreman_maintain/pull/143
> > 
> > To apply this, please add files/patch-bin_passenger-recycler in the
> > port I've sent before:
> > 
> > --- bin/passenger-recycler.orig 2018-02-20 21:09:18 UTC
> > +++ bin/passenger-recycler
> > @@ -41,10 +41,10 @@ def process_status?(pid)
> >  end
> >  
> >  require 'phusion_passenger'
> > +PhusionPassenger.locate_directories
> >  require 'phusion_passenger/platform_info'
> >  require 'phusion_passenger/platform_info/ruby'
> >  require 'phusion_passenger/admin_tools/memory_stats'
> > -PhusionPassenger.locate_directories
> >  stats = PhusionPassenger::AdminTools::MemoryStats.new
> >  unless stats.platform_provides_private_dirty_rss_information?
> >    puts 'Please run as root or platform unsupported'
> 
> Yes, this works, thanks!
> 
> > 
> > 
> > But the real problem is that Passenger does think it supports
> > getting process private dirty RSS memory information only on Linux:
> > 
> > https://github.com/phusion/passenger/blob/219ad24159ae4033a342e6ad7
> > 53
> > cfee05d98bae0/src/ruby_supportlib/phusion_passenger/admin_tools/mem
> > or
> > y_stats.rb#L121
> > 
> > In file
> > src/ruby_supportlib/phusion_passenger/admin_tools/memory_stats.rb:
> > 
> > 120       def platform_provides_private_dirty_rss_information?
> > 121         return os_name_simple == "linux"
> > 122       end
> > 
> > This support probably would need to be written. So, unfortunately,
> > passenger-recycler
> > as written will exit with:
> > 
> > 	Please run as root or platform unsupported
> 
> Yes, I have now gotten to this stage at least, thank you very much! I
> don´t mind having a look at it, it might be simplest thing to write,
> or
> it´s hell, but I´ll have a look!
> 
> Thank you for pointing me in the right direction!
> 
> /K
> 
> > 
> > But passenger-recycler does something very simple - if the amount
> > of
> > "private resident RSS
> > memory" is higher than specified amount in the configuration file,
> > it
> > kills the process.
> > 
> > You might get a much better monitoring on FreeBSD by monitoring the
> > output of
> > 
> > procstat -v <processid>
> > 
> > which will give you details about the memory usage of the process
> > and
> > see how it is growing
> > over time. Maybe you can pinpoint the shared library that causes
> > this, if you are lucky.

How do I interpret the output of 'procstat -v <pid>' though? Can I sum
up all of the RES or PRES numbers to get the total virtual memory that
this process is consuming?

/K

> > 
> > Marcin
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