mprof-heap-viewer GUI viewer for the logging profiler heap snapshots
WARNING: this application is unfinished and experimental. Nevertheless it should work, and bug reports
are encouraged.
This program decodes the contents of a logging profiler output file and locates all the heap snapshots
inside it. The user can then select each individual snapshot and decide to load it in memory and explore
its contents.
The GUI is organized to work on "object sets" (listed in a tree view on the left). All operations are
performed with a popup menu on the choosen set.
Initially the sets are the heap snapshots (of course a heap snapshot can be considered a set of
objects!). For each set the GUI shows on the right a list that breaks it down by class (one row for each
class).
The user can then refine each set using a "filter", to select a subset. Examples of filters are "all
objects of class X", or "all objects that reference an object of class X". This way the user explores
the sets breaking them down to subsets (each subset in the GUI is a child of its owner set on the tree
view).
Moreover the user can issue a "compare" operation between two arbitrary sets A and B, which will compute
two subsets: "A - B" (the objects of A which are not in B, a subsect of A) and "B - A" (the reverse).
This can help in understanding what changed on the heap between garbage collections.
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