Abstract: To achieve a balance between reduction of a disk capacity required to maintain measurement data and retention of necessary measurement data to analyze events. A monitoring computer stores measurement data about a monitoring target computer at a plurality of points in time in a storage device, specifies an event, which has occurred at the monitoring target computer, and event occurrence time based on the measurement data, and selects part of the measurement data at the plurality of points in time as a deletion target in consideration of the measurement data which should not be deleted, based on a capacity of the storage device or a predetermined retention period of the measurement data, and a deletion exception period calculated from the event occurrence time.

Abstract: A plurality of compiler directives are applied one by one to each program portion of a computer program including the program portions to be converted by the compiler directive to execute each program portion. An execution time of each program portion for each compiler directive is measured as a result of the execution. A compiler directive having a shortest execution time for each program portion is detected on the basis of the measured results. Each of the detected compiler directives is inserted into just before a relevant program portion to produce a program.