[rvm-research] Trying to learn garbage collection

I'm currently trying my hand at making a garbage collector in MMTk and I've followed the tutorial on adding a new GC (http://jikesrvm.org/Adding+a+New+GC). I've also peppered logs throughout the classes and methods of the new GC I've created, but I don't think I can really follow what's happening after running the tests.

For one, I've set the properties file to utilize bitmap marking (config.mmtk.headerMarkBit=true) in the BaseBaseMarkSweepTuned.properties file and it doesn't seem to achieve anything.

Another thing, the log files outputted are incredibly large. There's no discernible pattern among the methods that are called. I notice a lot of the alloc/postAlloc calls in the mutator, getPagesUsed, etc, but the file is too large for me to clearly understand it all.

Would anyone have any advice as to a better way towards understanding how GC's operate in this system? At least well enough so that I can reasonably affect the files when creating my own. In addition, would anyone know how to enable bitmap marking with the built-in MarkSweep collector?

Best Regards,
Richard

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