Testing for Excessive Program Store Compares
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
By using a separate clock (Time of Day (TOD)) as a reference and rippling a test kernel through storage that forces minimal program store compares (interference), then after one minute of kernel run a comparison of the CPU run time (as measured by the TOD clock) with the known value from the test system will show whether or not an excessive number of program store compares occurred. Since the test kernel is confined to run on only a 2-megabyte configuration, we loop the kernel through all instruction buffers to come up with approximately one-minute run time.