95 lines
3.3 KiB
Ruby
95 lines
3.3 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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PROC_STATUS_PATH = '/proc/self/status'
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PROC_SMAPS_ROLLUP_PATH = '/proc/self/smaps_rollup'
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PROC_LIMITS_PATH = '/proc/self/limits'
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PROC_FD_GLOB = '/proc/self/fd/*'
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PRIVATE_PAGES_PATTERN = /^(Private_Clean|Private_Dirty|Private_Hugetlb):\s+(?<value>\d+)/.freeze
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PSS_PATTERN = /^Pss:\s+(?<value>\d+)/.freeze
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RSS_PATTERN = /VmRSS:\s+(?<value>\d+)/.freeze
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MAX_OPEN_FILES_PATTERN = /Max open files\s*(?<value>\d+)/.freeze
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# Returns the current process' RSS (resident set size) in bytes.
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def self.memory_usage_rss
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sum_matches(PROC_STATUS_PATH, rss: RSS_PATTERN)[:rss].kilobytes
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end
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# Returns the current process' USS/PSS (unique/proportional set size) in bytes.
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def self.memory_usage_uss_pss
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sum_matches(PROC_SMAPS_ROLLUP_PATH, uss: PRIVATE_PAGES_PATTERN, pss: PSS_PATTERN)
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.transform_values(&:kilobytes)
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end
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def self.file_descriptor_count
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Dir.glob(PROC_FD_GLOB).length
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end
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def self.max_open_file_descriptors
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sum_matches(PROC_LIMITS_PATH, max_fds: MAX_OPEN_FILES_PATTERN)[:max_fds]
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end
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def self.cpu_time
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Process.clock_gettime(Process::CLOCK_PROCESS_CPUTIME_ID, :float_second)
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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.thread_cpu_time
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# Not all OS kernels are supporting `Process::CLOCK_THREAD_CPUTIME_ID`
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# Refer: https://gitlab.com/gitlab-org/gitlab/issues/30567#note_221765627
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return unless defined?(Process::CLOCK_THREAD_CPUTIME_ID)
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Process.clock_gettime(Process::CLOCK_THREAD_CPUTIME_ID, :float_second)
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end
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def self.thread_cpu_duration(start_time)
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end_time = thread_cpu_time
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return unless start_time && end_time
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end_time - start_time
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end
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# Given a path to a file in /proc and a hash of (metric, pattern) pairs,
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# sums up all values found for those patterns under the respective metric.
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def self.sum_matches(proc_file, **patterns)
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results = patterns.transform_values { 0 }
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begin
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File.foreach(proc_file) do |line|
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patterns.each do |metric, pattern|
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match = line.match(pattern)
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value = match&.named_captures&.fetch('value', 0)
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results[metric] += value.to_i
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end
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end
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rescue Errno::ENOENT
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# This means the procfile we're reading from did not exist;
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# this is safe to ignore, since we initialize each metric to 0
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end
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results
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end
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end
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end
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end
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