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The default GC algorithm G1 that is enabled by default with Java11 serves well on multiprocessor machines with large amount of memory where GC is probablistic with low pauses, where response time is more important than throughput and GC is kept shorter. The CloudStack management server is largely a multi-threaded server application that handles and orchestrates several network requests, and has the default max. heap size of only 2G that can be considered a small/medium application from a heap size perspective. Perhaps a more aggresive GC algorithm such as ParallelGC as used in Java8 and before (that is previous CloudStack releases) would serve better for throughput and cause more aggresive GC. Reference: https://docs.oracle.com/en/java/javase/11/gctuning/available-collectors.html#GUID-13943556-F521-4287-AAAA-AE5DE68777CD Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>