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The difference in speed between the outermost track (start of first partition) and the innermost track (end of last partition) is in the other of 50%.

Hard drive performance slows down the further from the start of the disk you get, as the angular velocity of each track is slower towards the middle. If you're testing this on teh same hardware and are running bootcamp, then if you are using a spinning hard drive (not an SSD), windows will be installed on the slower part of the disk. This means the application will load its own version of a shared library, rather than referencing the already loaded system version. Due to the "dll hell", windows apps typically include the specific version of a DLL they have been tested to work with, in the application directory. On reason could be that OS X is a "cleaner" platform than Windows. OpenGL performance is generally faster on Windows, for example.

These buffer pools can be used to share memory between Java code and native code, or map regions of a file into memory.It depends how you measure - what software you are testing and how. So this is one part of the memory lost to this internal bookkeeping.īuffer pools - Many libraries and frameworks allocate buffers outside of the heap to improve performance. Garbage collection - In order for the GC to know which objects are eligible for collection, it needs to keep track of the object graphs. Metaspace (PermGen in older Java versions) - Metaspace stores the Class definitions of your Objects, and some other metadata.Ĭode cache - The JIT compiler stores native code it generates in the code cache to improve performance by reusing it. The stack is cleaned up as stack frames move out of context so there is no GC performed here. The stack stores primitive local variables and object references along with the call stack (list of method invocations) itself. Thread stacks - Each thread has its own call stack. Heap - The heap is where your Class instantiations or “Objects” are stored.