Module: ActiveSupport::Benchmarkable

### Home Classes Methods

### In Files

- lib/active_support/benchmarkable.rb

### Methods

- #benchmark
- #silence

### Class/Module Index

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No matching classes.

# ActiveSupport::Benchmarkable

### Public Instance Methods

benchmark(message = "Benchmarking", options = {}) click to toggle source

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 as the :level option. (:debug, :info, :warn, :error); the default 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 inside the block. This is great for boiling down a noisy block to just a single statement:

    <% benchmark "Process data files", :level => :info, :silence => true do %>
      <%= expensive_and_chatty_files_operation %>
    <% end %>

    # File lib/active_support/benchmarkable.rb, line 32
    def benchmark(message = "Benchmarking", options = {})
      if logger
        if options.is_a?(Symbol)
          ActiveSupport::Deprecation.warn("use benchmark('#{message}', :level => :#{options}) instead", caller)
          options = { :level => options, :silence => false }
        else
          options.assert_valid_keys(:level, :silence)
          options[:level] ||= :info
        end

        result = nil
        ms = Benchmark.ms { result = options[:silence] ? logger.silence { yield } : yield }
        logger.send(options[:level], '%s (%.1fms)' % [ message, ms ])
        result
      else
        yield
      end
    end

silence() click to toggle source

Silence the logger during the execution of the block.

    # File lib/active_support/benchmarkable.rb, line 53
    def silence
      old_logger_level, logger.level = logger.level, ::Logger::ERROR if logger
      yield
    ensure
      logger.level = old_logger_level if logger
    end

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