93 lines
2.4 KiB
Ruby
93 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Metrics
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# Module for gathering system/process statistics such as the memory usage.
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#
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# This module relies on the /proc filesystem being available. If /proc is
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# not available the methods of this module will be stubbed.
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module System
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if File.exist?('/proc')
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# Returns the current process' memory usage in bytes.
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def self.memory_usage
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mem = 0
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match = File.read('/proc/self/status').match(/VmRSS:\s+(\d+)/)
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if match && match[1]
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mem = match[1].to_f * 1024
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end
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mem
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end
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def self.file_descriptor_count
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Dir.glob('/proc/self/fd/*').length
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end
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def self.max_open_file_descriptors
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match = File.read('/proc/self/limits').match(/Max open files\s*(\d+)/)
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return unless match && match[1]
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match[1].to_i
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end
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def self.process_start_time
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fields = File.read('/proc/self/stat').split
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# fields[21] is linux proc stat field "(22) starttime".
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# The value is expressed in clock ticks, divide by clock ticks for seconds.
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( fields[21].to_i || 0 ) / clk_tck
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end
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else
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def self.memory_usage
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0.0
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end
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def self.file_descriptor_count
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0
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end
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def self.max_open_file_descriptors
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0
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end
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def self.process_start_time
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0
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end
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end
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# THREAD_CPUTIME is not supported on OS X
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if Process.const_defined?(:CLOCK_THREAD_CPUTIME_ID)
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def self.cpu_time
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Process
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.clock_gettime(Process::CLOCK_THREAD_CPUTIME_ID, :float_second)
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end
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else
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def self.cpu_time
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Process
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.clock_gettime(Process::CLOCK_PROCESS_CPUTIME_ID, :float_second)
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end
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end
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# Returns the current real time in a given precision.
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#
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# Returns the time as a Float for precision = :float_second.
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def self.real_time(precision = :float_second)
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Process.clock_gettime(Process::CLOCK_REALTIME, precision)
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end
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# Returns the current monotonic clock time as seconds with microseconds precision.
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#
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# Returns the time as a Float.
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def self.monotonic_time
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Process.clock_gettime(Process::CLOCK_MONOTONIC, :float_second)
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end
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def self.clk_tck
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@clk_tck ||= `getconf CLK_TCK`.to_i
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end
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end
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end
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end
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