sentences:  By default, OpenJ9 uses the Generational Concurrent (codice_1) policy, which is best suited to transactional applications that have many short lived objects.Alternative policies are available, including those that cater for applications with large Java heaps (codice_2), applications that are sensitive to response-time (codice_3), or applications that require high application throughput (codice_4).An "idle tuning" option () triggers garbage collection in OpenJ9 when the application is idle.