#!/usr/bin/env python

##
 # ###################################################################
 #  FiPy - Python-based finite volume PDE solver
 #
 #  FILE: "memoryLeak.py"
 #
 #  Author: Jonathan Guyer <guyer@nist.gov>
 #  Author: Daniel Wheeler <daniel.wheeler@nist.gov>
 #  Author: James Warren   <jwarren@nist.gov>
 #    mail: NIST
 #     www: http://www.ctcms.nist.gov/fipy/
 #
 # ========================================================================
 # This software was developed at the National Institute of Standards
 # of Standards and Technology, an agency of the Federal Government.
 # Pursuant to title 17 section 105 of the United States Code,
 # United States Code this software is not subject to copyright
 # protection, and this software is considered to be in the public domain.
 # FiPy is an experimental system.
 # NIST assumes no responsibility whatsoever for its use by whatsoever for its use by
 # other parties, and makes no guarantees, expressed or implied, about
 # its quality, reliability, or any other characteristic.  We would
 # appreciate acknowledgement if the software is used.
 #
 # To the extent that NIST may hold copyright in countries other than the
 # United States, you are hereby granted the non-exclusive irrevocable and
 # unconditional right to print, publish, prepare derivative works and
 # distribute this software, in any medium, or authorize others to do so on
 # your behalf, on a royalty-free basis throughout the world.
 #
 # You may improve, modify, and create derivative works of the software or
 # any portion of the software, and you may copy and distribute such
 # modifications or works.  Modified works should carry a notice stating
 # that you changed the software and should note the date and nature of any
 # such change.  Please explicitly acknowledge the National Institute of
 # Standards and Technology as the original source.
 #
 # This software can be redistributed and/or modified freely provided that
 # any derivative works bear some notice that they are derived from it, and
 # any modified versions bear some notice that they have been modified.
 # ========================================================================
 #
 # ###################################################################

"""

This python script is ripped from
http://www.nightmare.com/medusa/memory-leaks.html

It outputs the top 100 number of outstanding references for each
object.

"""

__all__ = []

import sys
import types

def _get_refcounts(theClass = None):
    d = {}
    sys.modules
    # collect all classes
    for m in sys.modules.values():
        for sym in dir(m):
            o = getattr (m, sym)
            if type(o) is types.ClassType:
                if theClass is not None and o is not theClass:
                    continue
                d[o] = sys.getrefcount (o)
    # sort by refcount
    pairs = map (lambda x: (x[1],x[0]), d.items())
    pairs.sort()
    pairs.reverse()
    return pairs

def _print_top_N(n = 100, theClass = None):
    for n, c in _get_refcounts(theClass)[:n]:
        print '%10d %s' % (n, c.__name__)

if __name__ == '__main__':
    print_top_N()
