/usr/bin/mono-heapviz is in mono-devel 4.2.1.102+dfsg2-7ubuntu4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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# Generate a heap visualization for SGen from the heap dump written by
# mono if the MONO_GC_DEBUG is set to something like
# "heap-dump=/path/to/file". This script accepts the file as stdin
# and generates HTML and PNG files.
from __future__ import print_function
import sys, os
import Image, ImageDraw
from xml.sax import ContentHandler, make_parser
from xml.sax.handler import feature_namespaces
from optparse import OptionParser
chunk_size = 1024 # number of bytes in a chunk
chunk_pixel_size = 2 # a chunk is a square with this side length
large_sections = False
def mark_chunk (img_draw, i, color, section_width):
row = i / section_width
col = i % section_width
pixel_col = col * chunk_pixel_size
pixel_row = row * chunk_pixel_size
img_draw.rectangle ([(pixel_col, pixel_row), (pixel_col + chunk_pixel_size - 1, pixel_row + chunk_pixel_size - 1)], fill = color)
class Range:
pass
class OccupiedRange (Range):
def __init__ (self, offset, size):
self.offset = offset
self.size = size
def mark (self, img_draw, color, section_width):
start = self.offset / chunk_size
end = (self.offset + self.size - 1) / chunk_size
for i in range (start, end + 1):
mark_chunk (img_draw, i, color, section_width)
class ObjectRange (OccupiedRange):
def __init__ (self, klass, offset, size):
OccupiedRange.__init__ (self, offset, size)
self.klass = klass;
class SectionHandler:
def __init__ (self, width):
self.width = width
self.ranges = []
self.size = 0
self.used = 0
def add_object (self, klass, offset, size):
self.ranges.append (ObjectRange (klass, offset, size))
self.used += size
def add_occupied (self, offset, size):
self.ranges.append (OccupiedRange (offset, size))
self.used += size
def draw (self):
height = (((self.size / chunk_size) + (self.width - 1)) / self.width) * chunk_pixel_size
color_background = (255, 255, 255)
color_free = (0, 0, 0)
color_occupied = (0, 255, 0)
img = Image.new ('RGB', (self.width * chunk_pixel_size, height), color_free)
img_draw = ImageDraw.Draw (img)
#FIXME: remove filling after end of heap
for r in self.ranges:
r.mark (img_draw, color_occupied, self.width)
return img
def emit (self, collection_file, collection_kind, collection_num, section_num):
print ('<h2>%s</h2>' % self.header (), file = collection_file)
print ('<p>Size %d kB - ' % (self.size / 1024), file = collection_file)
print ('used %d kB</p>' % (self.used / 1024), file = collection_file)
filename = '%s_%d_%d.png' % (collection_kind, collection_num, section_num)
print ('<p><img src="%s"></img></p>' % filename, file = collection_file)
img = self.draw ()
img.save (filename)
class SmallSectionHandler (SectionHandler):
def __init__ (self):
SectionHandler.__init__ (self, -1)
self.offset = 0
def start_section (self, kind, size):
assert kind == 'old'
if self.width <= 0:
self.width = (size + chunk_size - 1) / chunk_size
if self.width < 128:
self.width = 512
self.current_section_size = size
else:
self.current_section_size = self.width * chunk_size
self.size += size
def add_object (self, klass, offset, size):
SectionHandler.add_object (self, klass, self.offset + offset, size)
def add_occupied (self, offset, size):
SectionHandler.add_occupied (self, self.offset + offset, size)
def end_section (self):
self.offset += self.current_section_size
def header (self):
return 'old sections'
class LargeSectionHandler (SectionHandler):
def __init__ (self):
SectionHandler.__init__ (self, 512)
def start_section (self, kind, size):
self.kind = kind
self.ranges = []
self.size = size
self.used = 0
def end_section (self):
pass
def header (self):
return self.kind + ' section'
class DocHandler (ContentHandler):
def start (self):
self.collection_index = 0
self.index_file = open ('index.html', 'w')
print ('<html><body>', file = self.index_file)
def end (self):
print ('</body></html>', file = self.index_file)
self.index_file.close ()
def startElement (self, name, attrs):
if name == 'collection':
self.collection_kind = attrs.get('type', None)
self.collection_num = int(attrs.get('num', None))
reason = attrs.get('reason', None)
if reason:
reason = ' (%s)' % reason
else:
reason = ''
self.section_num = 0
filename = 'collection_%d.html' % self.collection_index
print ('<a href="%s">%s%s collection %d</a>' % (filename, self.collection_kind, reason, self.collection_num), file = self.index_file)
self.collection_file = open (filename, 'w')
print ('<html><body>', file = self.collection_file)
print ('<p><a href="collection_%d.html">Prev</a> <a href="collection_%d.html">Next</a> <a href="index.html">Index</a></p>' % (self.collection_index - 1, self.collection_index + 1), file = self.collection_file)
print ('<h1>%s collection %d</h1>' % (self.collection_kind, self.collection_num), file = self.collection_file)
self.usage = {}
self.los_usage = {}
self.pinned_usage = {}
self.occupancies = {}
self.in_los = False
self.in_pinned = False
self.heap_used = 0
self.heap_size = 0
self.los_size = 0
if large_sections:
self.section_handler = LargeSectionHandler ()
else:
self.section_handler = self.small_section_handler = SmallSectionHandler ()
elif name == 'pinned':
kind = attrs.get('type', None)
bytes = int(attrs.get('bytes', None))
print ('Pinned from %s: %d kB<br>' % (kind, bytes / 1024), file = self.collection_file)
elif name == 'occupancy':
size = int (attrs.get ('size', None))
available = int (attrs.get ('available', None))
used = int (attrs.get ('used', None))
unused = available - used
print ('Occupancy of %d byte slots: %d / %d (%d kB / %d%% wasted)<br>' % (size, used, available, unused * size / 1024, unused * 100 / available), file = self.collection_file)
elif name == 'section':
kind = attrs.get('type', None)
size = int(attrs.get('size', None))
self.heap_size += size
if not large_sections:
if kind == 'nursery':
self.section_handler = LargeSectionHandler ()
else:
self.section_handler = self.small_section_handler
self.section_handler.start_section (kind, size)
elif name == 'object':
klass = attrs.get('class', None)
size = int(attrs.get('size', None))
if self.in_los:
usage_dict = self.los_usage
self.los_size += size
elif self.in_pinned:
location = attrs.get('location', None)
if location not in self.pinned_usage:
self.pinned_usage[location] = {}
usage_dict = self.pinned_usage[location]
else:
usage_dict = self.usage
offset = int(attrs.get('offset', None))
self.section_handler.add_object (klass, offset, size)
self.heap_used += size
if not (klass in usage_dict):
usage_dict [klass] = (0, 0)
usage = usage_dict [klass]
usage_dict [klass] = (usage [0] + 1, usage [1] + size)
elif name == 'occupied':
offset = int(attrs.get('offset', None))
size = int(attrs.get('size', None))
self.section_handler.add_occupied (offset, size)
self.heap_used += size
elif name == 'los':
self.in_los = True
elif name == 'pinned-objects':
self.in_pinned = True
def dump_usage (self, usage_dict, limit):
klasses = sorted (usage_dict.keys (), lambda x, y: usage_dict [y][1] - usage_dict [x][1])
if limit:
klasses = klasses [0:limit]
for klass in klasses:
usage = usage_dict [klass]
if usage [1] < 100000:
print ('%s %d bytes' % (klass, usage [1]), file = self.collection_file)
else:
print ('%s %d kB' % (klass, usage [1] / 1024), file = self.collection_file)
print (' (%d)<br>' % usage [0], file = self.collection_file)
def endElement (self, name):
if name == 'section':
self.section_handler.end_section ()
if large_sections or self.section_handler != self.small_section_handler:
self.section_handler.emit (self.collection_file, self.collection_kind, self.collection_num, self.section_num)
self.section_num += 1
elif name == 'collection':
if not large_sections:
self.small_section_handler.emit (self.collection_file, self.collection_kind, self.collection_num, self.section_num)
self.dump_usage (self.usage, 10)
print ('<h3>LOS</h3>', file = self.collection_file)
self.dump_usage (self.los_usage, None)
print ('<h3>Pinned</h3>', file = self.collection_file)
for location in sorted (self.pinned_usage.keys ()):
print ('<h4>%s</h4>' % location, file = self.collection_file)
self.dump_usage (self.pinned_usage[location], None)
print ('</body></html>', file = self.collection_file)
print (' - %d kB / %d kB (%d%%) - %d kB LOS</a><br>' % (self.heap_used / 1024, self.heap_size / 1024, int(100.0 * self.heap_used / self.heap_size), self.los_size / 1024), file = self.index_file)
self.collection_file.close ()
self.collection_index += 1
elif name == 'los':
self.in_los = False
elif name == 'pinned-objects':
self.in_pinned = False
def main ():
usage = "usage: %prog [options]"
parser = OptionParser (usage)
parser.add_option ("-l", "--large-sections", action = "store_true", dest = "large_sections")
parser.add_option ("-s", "--small-sections", action = "store_false", dest = "large_sections")
(options, args) = parser.parse_args ()
if options.large_sections:
large_sections = True
dh = DocHandler ()
parser = make_parser ()
parser.setFeature (feature_namespaces, 0)
parser.setContentHandler (dh)
dh.start ()
parser.parse (sys.stdin)
dh.end ()
if __name__ == "__main__":
main ()
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