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Is there a way of finding how many bytes were allocated in a Java application? If possible, without changing the code? Thanks.

franco
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  • many discussions about that: http://stackoverflow.com/questions/19785290/java-unit-testing-how-to-measure-memory-footprint-for-method-call http://stackoverflow.com/questions/3536149/best-way-to-measure-memory-usage-of-a-java-program http://stackoverflow.com/questions/21272877/understanding-jvm-memory-allocation-and-java-out-of-memory-heap-space – guillaume girod-vitouchkina Dec 06 '15 at 21:16
  • By "allocated in a Java application", can you clarify a little? Do you mean total memory usage within the VM environment, or something else? – J. Murray Dec 06 '15 at 21:17
  • yes, I mean total memory usage. – franco Dec 06 '15 at 21:19

2 Answers2

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for example, from this post: Java unit testing: how to measure memory footprint for method call

Runtime.getRuntime().freeMemory();

Runtime.getRuntime().totalMemory();

Community
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guillaume girod-vitouchkina
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You can use several available methods in java.lang.Runtime [1] class or (more sophisticated) JMX [2]

[1] http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html
[2] https://docs.oracle.com/javase/tutorial/jmx/overview/javavm.html

Andrea
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