1. A method, in a data processing system, for comparing the performance of applications, comprising: identifying at least one first application log record associated with a first application and having performance information of interest; performing a first mapping of the at least one first application log record to at least one alternative log record associated with events of an underlying first environment in which the first application is executed; performing a second mapping of the at least one alternative log record to at least one second application log record associated with a second application executing in an underlying second environment; generating first performance measurements of the first application based on the at least one first application log record; generating second performance measurements of the second application based on the at least one second application log record; comparing the first performance measurements and the second performance measurements based on the first mapping and the second mapping; and outputting a result of the comparison to thereby compare performance of the first application in the first environment with performance of the second application in the second environment.