Class: PhusionPassenger::AdminTools::MemoryStats

Inherits:
Object
  • Object
show all
Defined in:
lib/phusion_passenger/admin_tools/memory_stats.rb

Defined Under Namespace

Classes: Process

Instance Method Summary collapse

Instance Method Details

#apache_processes ⇒ Object

Returns a list of Apache processes, which may be the empty list if Apache is not running. If the Apache executable name is unknown then nil will be returned.



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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 64

def apache_processes
	@apache_processes ||= begin
		if PlatformInfo.httpd
			processes = list_processes(:exe => PlatformInfo.httpd)
			if processes.empty?
				# On some Linux distros, the Apache worker processes
				# are called "httpd.worker"
				processes = list_processes(:exe => "#{PlatformInfo.httpd}.worker")
			end
			processes
		else
			nil
		end
	end
end

#nginx_processes ⇒ Object

Returns a list of Nginx processes, which may be the empty list if Nginx is not running.



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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 82

def nginx_processes
	@nginx_processes ||= list_processes(:exe => "nginx")
end

#passenger_processes ⇒ Object

Returns a list of Phusion Passenger processes, which may be the empty list if Phusion Passenger is not running.



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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 88

def passenger_processes
	@passenger_processes ||= list_processes(:match =>
		/((^| )Passenger |(^| )Rails:|(^| )Rack:|PassengerHelperAgent|PassengerWatchdog|PassengerLoggingAgent)/)
end

#platform_provides_private_dirty_rss_information? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 117

def platform_provides_private_dirty_rss_information?
	return ruby_platform =~ /linux/
end

#root_privileges_required_for_private_dirty_rss? ⇒ Boolean

Returns whether root privileges are required in order to measure private dirty RSS. Only meaningful if #platform_provides_private_dirty_rss_information? returns true.

Returns:

  • (Boolean) 


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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 123

def root_privileges_required_for_private_dirty_rss?
	all_processes = (apache_processes || []) + nginx_processes + passenger_processes
	return all_processes.any?{ |p| p.private_dirty_rss.nil? }
end

#should_show_private_dirty_rss? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 128

def should_show_private_dirty_rss?
	return platform_provides_private_dirty_rss_information? &&
		(::Process.euid == 0 || root_privileges_required_for_private_dirty_rss?)
end

#sum_memory_usage(processes) ⇒ Object

Returns the sum of the memory usages of all given processes. Returns a pair [usage, accurate]. usage is the summed memory usage in KB, and accurate indicates whether this sum is accurate. This may be false if some process’s memory usage cannot be determined.



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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 97

def sum_memory_usage(processes)
	total = 0
	if should_show_private_dirty_rss?
		accurate = true
		processes.each do |p|
			if p.private_dirty_rss.is_a?(Numeric)
				total += p.private_dirty_rss
			else
				accurate = true
			end
		end
		return [total, accurate]
	else
		processes.each do |p|
			total += p.rss
		end
		return [total, true]
	end
end

#system_ram_usage ⇒ Object

Determine the system’s RAM usage, not including swap. Returns a tuple [total, used] where both numbers are in KB, or nil if the system’s RAM usage cannot be determined.



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# File 'lib/phusion_passenger/admin_tools/memory_stats.rb', line 136

def system_ram_usage
	@total_system_ram ||= begin
		case ruby_platform
		when /linux/
			free_text = `free -k`
			
			free_text =~ %r{Mem:(.+)$}
			line = $1.strip
			total = line.split(/ +/).first.to_i
			
			free_text =~ %r{buffers/cache:(.+)$}
			line = $1.strip
			used = line.split(/ +/).first.to_i
			
			[total, used]
		when /darwin/
			vm_stat = `vm_stat`
			vm_stat =~ /page size of (\d+) bytes/
			page_size = $1
			vm_stat =~ /Pages free: +(\d+)/
			free = $1
			vm_stat =~ /Pages active: +(\d+)/
			active = $1
			vm_stat =~ /Pages inactive: +(\d+)/
			inactive = $1
			vm_stat =~ /Pages wired down: +(\d+)/
			wired = $1
			
			if page_size && free && active && inactive && wired
				page_size = page_size.to_i
				free = free.to_i * page_size / 1024
				active = active.to_i * page_size / 1024
				inactive = inactive.to_i * page_size / 1024
				wired = wired.to_i * page_size / 1024
				
				used = active + wired
				[free + inactive + used, used]
			else
				nil
			end
		else
			`top` =~ /(\d+)(K|M) Active, (\d+)(K|M) Inact, (\d+)(K|M) Wired,.*?(\d+)(K|M) Free/
			if $1 && $2 && $3 && $4 && $5 && $6 && $7 && $8
				to_kb = lambda do |number, unit|
					if unit == 'K'
						number.to_i
					else
						number.to_i * 1024
					end
				end
				
				active = to_kb.call($1, $2)
				inactive = to_kb.call($3, $4)
				wired = to_kb.call($5, $6)
				free = to_kb.call($7, $8)
				
				used = active + wired
				[free + inactive + used, used]
			else
				nil
			end
		end
	end
end