Log and benchmark multiple statements in a single block. Example:

Project.benchmark("Creating project") do
  project = Project.create("name" => "stuff")
  project.create_manager("name" => "David")
  project.milestones << Milestone.find(:all)
end

The benchmark is only recorded if the current level of the logger matches the log_level, which makes it easy to include benchmarking statements in production software that will remain inexpensive because the benchmark will only be conducted if the log level is low enough.

The logging of the multiple statements is turned off unless use_silence is set to false.

Source Code

# File active_record/base.rb, line 1184
def benchmark(title, log_level = Logger::DEBUG, use_silence = true)
  if logger && logger.level == log_level
    result = nil
    seconds = Benchmark.realtime { result = use_silence ? silence { yield } : yield }
    logger.add(log_level, "#{title} (#{'%.5f' % seconds})")
    result
  else
    yield
  end
end