require 'active_support/core_ext/benchmark' require 'active_support/core_ext/hash/keys' module ActiveSupport module Benchmarkable # Allows you to measure the execution time of a block in a template and # records the result to the log. Wrap this block around expensive operations # or possible bottlenecks to get a time reading for the operation. For # example, let's say you thought your file processing method was taking too # long; you could wrap it in a benchmark block. # # <% benchmark 'Process data files' do %> # <%= expensive_files_operation %> # <% end %> # # That would add something like "Process data files (345.2ms)" to the log, # which you can then use to compare timings when optimizing your code. # # You may give an optional logger level (:debug, :info, # :warn, :error) as the :level option. The # default logger level value is :info. # # <% benchmark 'Low-level files', level: :debug do %> # <%= lowlevel_files_operation %> # <% end %> # # Finally, you can pass true as the third argument to silence all log # activity (other than the timing information) from inside the block. This # is great for boiling down a noisy block to just a single statement that # produces one log line: # # <% benchmark 'Process data files', level: :info, silence: true do %> # <%= expensive_and_chatty_files_operation %> # <% end %> def benchmark(message = "Benchmarking", options = {}) if logger options.assert_valid_keys(:level, :silence) options[:level] ||= :info result = nil ms = Benchmark.ms { result = options[:silence] ? silence { yield } : yield } logger.send(options[:level], '%s (%.1fms)' % [ message, ms ]) result else yield end end # Silence the logger during the execution of the block. def silence ActiveSupport::Deprecation.warn "ActiveSupport::Benchmarkable#silence is deprecated. It will be removed from Rails 4.1." old_logger_level, logger.level = logger.level, ::Logger::ERROR if logger yield ensure logger.level = old_logger_level if logger end end end