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Automatically exported from code.google.com/p/memory-measurer
License: Apache License 2.0
This project forked from dimitrisandreou/memory-measurer
Automatically exported from code.google.com/p/memory-measurer
License: Apache License 2.0
ObjectExplorer, by Dimitris Andreou ([email protected]) = Introduction = ==[http://memory-measurer.googlecode.com/svn/trunk/dist/javadoc/index.html Javadocs]== A small tool that is very handy when e.g. you design data structures and want to see how much memory each one uses. To do this, it uses a simple reflection-based object-traversing framework ([http://memory-measurer.googlecode.com/svn/trunk/dist/javadoc/objectexplorer/ObjectExplorer.html ObjectExplorer]). On it, it builds two facilities: * [http://memory-measurer.googlecode.com/svn/trunk/dist/javadoc/objectexplorer/MemoryMeasurer.html MemoryMeasurer], which can estimate the memory footprint of an object graph _in bytes_. This requires installing a javaagent when running the JVM, e.g. by passing {{{-javaagent:path/to/object-explorer.jar}}}. * [http://memory-measurer.googlecode.com/svn/trunk/dist/javadoc/objectexplorer/ObjectGraphMeasurer.html ObjectGraphMeasurer] does not need a javaagent, and can also give a much more qualitative measurement than !MemoryMeasurer - it counts the number of objects, references, and primitives (of each kind) that an object graph entails. Also of interest is the synergy with this project (of yours truly) : [http://code.google.com/p/jbenchy/ JBenchy] Put together, they allow you to easily and systematically run and analyze benchmarks regarding data structures. == How to use == An extremely simple example: {{{ long memory = MemoryMeasurer.measureBytes(new HashMap()); }}} or {{{ Footprint footprint = ObjectGraphMeasurer.measure(new HashMap()); }}} Quick tip: To use the MemoryMeasurer (to measure the footprint of an object graph in bytes), this parameter needs to be passed to th VM: -javaagent:path/to/object-explorer.jar
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