Added Line 7-11 to allow benchmark a specific file only

gistfile1.txt

require "timeout"

desc "Run Celluloid benchmarks"
task :benchmark do
  begin
    Timeout.timeout(120) do
      if ENV['FILE']
        glob = File.expand_path("../../benchmarks/#{ENV['FILE']}.rb", __FILE__)
      else
        glob = File.expand_path("../../benchmarks/*.rb", __FILE__)
      end
      Dir[glob].each { |benchmark| load benchmark }
    end
  rescue ::Exception, Timeout::Error => ex
    puts "ERROR: Couldn't complete benchmark: #{ex.class}: #{ex}"
    puts "  #{ex.backtrace.join("\n  ")}"

    exit 1 unless ENV["CI"] # Hax for running benchmarks on Travis
  end
end

Added Line 7-11 to allow benchmark a specific file only.
if ENV['FILE'] glob = File.expand_path("../../benchmarks/#{ENV['FILE']}.rb", __FILE__) else glob = File.expand_path("../../benchmarks/*.rb", __FILE__) end

Should I create a pull request for this?

Yes.