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3 billion items in Java Map with 16 GB RAM One rainy evening I meditated about memory managment in Java and how effectively Java collections utilise memory. I made simple experiment, how much entries can I insert into Java Map with 16 GB of RAM? Goal of this experiment is to investigate internal overhead of collections. So I decided to use small keys and small values. All tests were made on Linux 64bit Kubuntu 12.04. JVM was 64bit Oracle Java 1.7.0_09-b05 23.5-b02 . There is option to use compressed pointers (-XX:+UseCompressedOops), which is on by default on this JVM.

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