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• Fast (can be used in production) 
• Provides detailed information (can be used to identify problematic pieces of code)
• Configurable level of detail (as a compromise between speed and detailness)
  

• Open Source (help us improve it!)

Known issues

In current version (build 21):

• Does not work with a code that is compiled by Java 7
• Does not take into account the fact, that some memory allocation are removed by JIT after escape analysis

Origin and Goals

Java VM has an option -Xaprof printing how many instances of classes were allocated during lifetime of the application and how much memory they occupied in total and per instance. The option has no performance impact due to the fact that counting takes place during garbage collection. The only drawbacks are occasional overflows of counters and the absence of any information on locations where the object allocations take place.

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