A processing system 1 including a memory 10 and a cache memory 4 is provided with a page status unit 40 for providing a cache controller with a page open indication indicating one or more open pages of data values in memory. A method for producing a distillate stream comprising HMD is disclosed, which is suitable for the production of Nylon-6,6. The forward and back ward directions are perpendicular to the surface of the base member. Therefore, a serious technical difficulties have been solved that the sensor made by the prior art can’t measure different corrosion states of actual heat-exchanger tubes, that the corrosion rate measured is different from the corrosion rate of actual heat-exchanger tubes, and that the cost of anti-corrosive treatments is high. This enables the use of independent fabrication process technologies, one arranged for the memory array, and another arranged for the supporting peripheral circuit.