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Log Rails object allocations during a request
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| class ApplicationController < ActionController::Base | |
| around_action :track_object_allocation | |
| def allocation_logger | |
| @@allocation_logger ||= begin | |
| logger = Logger.new("#{Rails.root}/log/allocation_trace.log") | |
| logger.formatter = proc { |_severity, _datetime, _progname, msg| | |
| "#{msg}\n" | |
| } | |
| logger | |
| end | |
| end | |
| def track_object_allocation | |
| gc_stats = GC.stat | |
| prev_allocated = gc_stats[:total_allocated_objects] | |
| prev_freed = gc_stats[:total_freed_objects] | |
| yield | |
| gc_stats = GC.stat | |
| post_allocated = gc_stats[:total_allocated_objects] | |
| post_freed = gc_stats[:total_freed_objects] | |
| allocation_logger.info( | |
| "#{request.parameters['controller']}##{request.parameters['action']}."\ | |
| "#{request.format.to_sym} | "\ | |
| "Allocated: #{post_allocated - prev_allocated} | "\ | |
| "Freed: #{post_freed - prev_freed}" | |
| ) | |
| end | |
| end | |
| # This will produce a log file in log/response_times.log with the following format: | |
| # organizations#index.html | Allocated: 1806829 | Freed: 1476976 | |
| # organizations#index.json | Allocated: 24971059 | Freed: 10092833 | |
| # organizations#index.html | Allocated: 1773136 | Freed: 2924318 | |
| # organizations#index.html | Allocated: 1456358 | Freed: 3755718 |
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