GC signal for Qless

gc_signal.rb

          trap('USR1') do
            before_status = File.read("/proc/#{Process.pid}/status")
            before_time = Time.now
            GC.start
            after_time = Time.now
            duration_in_ms = ((after_time - before_time) * 1000).to_i
            after_status = File.read("/proc/#{Process.pid}/status")

            log(:error, "Ran GC. Took #{duration_in_ms} ms. Before proc status: #{before_status}. After proc status: #{after_status}")
          end