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# frozen_string_literal: true
module Gitlab
module Metrics
# Module for gathering system/process statistics such as the memory usage.
#
# This module relies on the /proc filesystem being available. If /proc is
# not available the methods of this module will be stubbed.
module System
if File.exist?('/proc')
# Returns the current process' memory usage in bytes.
def self.memory_usage
mem = 0
match = File.read('/proc/self/status').match(/VmRSS:\s+(\d+)/)
if match && match[1]
mem = match[1].to_f * 1024
end
mem
end
def self.file_descriptor_count
Dir.glob('/proc/self/fd/*').length
end
def self.max_open_file_descriptors
match = File.read('/proc/self/limits').match(/Max open files\s*(\d+)/)
return unless match && match[1]
match[1].to_i
end
else
def self.memory_usage
0.0
end
def self.file_descriptor_count
0
end
def self.max_open_file_descriptors
0
end
end
def self.cpu_time
Process
.clock_gettime(Process::CLOCK_PROCESS_CPUTIME_ID, :float_second)
end
# Returns the current real time in a given precision.
#
# Returns the time as a Float for precision = :float_second.
def self.real_time(precision = :float_second)
Process.clock_gettime(Process::CLOCK_REALTIME, precision)
end
# Returns the current monotonic clock time as seconds with microseconds precision.
#
# Returns the time as a Float.
def self.monotonic_time
Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_second)
end
def self.clk_tck
@clk_tck ||= `getconf CLK_TCK`.to_i
end
end
end
end
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