PHYSICAL_MEMORY is a system parameter that specifies the amount of physical memory available for use on Alpha and Integrity servers. The default setting is -1, which equates to all memory in the system. Decreasing this parameter allows you to test smaller configurations of memory without having to remove memory boards. This special parameter is use by VSI and is subject to change. Do not change this parameter unless VSI recommends that you do so. Because of hardware configuration requirements on the AlphaServer ES47/ES80/GS1280 systems, VSI does not recommend altering the setting of the system parameter PHYSICAL_MEMORY from its default setting of -1. Artificially reducing the amount of memory can produce unpredictable results on these systems. PHYSICAL_MEMORY is an AUTOGEN parameter. PHYSICALPAGES is an AUTOGEN parameter.