debian-mirror-gitlab/lib/gitlab/utils/measuring.rb
2020-05-24 23:13:21 +05:30

79 lines
2 KiB
Ruby

# frozen_string_literal: true
require 'prometheus/pid_provider'
module Gitlab
module Utils
class Measuring
class << self
attr_writer :logger
def logger
@logger ||= Logger.new(STDOUT)
end
end
def initialize(base_log_data = {})
@base_log_data = base_log_data
end
def with_measuring
result = nil
with_gc_stats do
with_count_queries do
with_measure_time do
result = yield
end
end
end
log_info(
gc_stats: gc_stats,
time_to_finish: time_to_finish,
number_of_sql_calls: sql_calls_count,
memory_usage: "#{Gitlab::Metrics::System.memory_usage_rss.to_f / 1024 / 1024} MiB",
label: ::Prometheus::PidProvider.worker_id
)
result
end
private
attr_reader :gc_stats, :time_to_finish, :sql_calls_count, :base_log_data
def with_count_queries(&block)
@sql_calls_count = 0
counter_f = ->(_name, _started, _finished, _unique_id, payload) {
@sql_calls_count += 1 unless payload[:name].in? %w[CACHE SCHEMA]
}
ActiveSupport::Notifications.subscribed(counter_f, "sql.active_record", &block)
end
def with_gc_stats
GC.start # perform a full mark-and-sweep
stats_before = GC.stat
yield
stats_after = GC.stat
@gc_stats = stats_after.map do |key, after_value|
before_value = stats_before[key]
[key, before: before_value, after: after_value, diff: after_value - before_value]
end.to_h
end
def with_measure_time
@time_to_finish = Benchmark.realtime do
yield
end
end
def log_info(details)
details = base_log_data.merge(details)
details = details.to_yaml if ActiveSupport::Logger.logger_outputs_to?(Measuring.logger, STDOUT)
Measuring.logger.info(details)
end
end
end
end