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Linux top not tallying with java used memory

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linux-howto

http://serverfault.com – We have a java application where towards the last part of the codes we wrote these lines Runtime runtime = Runtime.getRuntime(); long memory = runtime.totalMemory() - runtime.freeMemory(); System.out.println("\n\nUsed memory is bytes: " + memory); What we notice is that over time the top shows increase in the memory(%) column for the application but the java memory(from runtime variables) values shows fluctuation up and down? So which should we follow to decide on exact memory usage? My intention is to identify if there is any memory leakage in my application? (HowTos)