discourse/script/diff_heaps.rb

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# to be used to compare ruby heaps generated in 2.1
# can isolate memory leaks
#
# rbtrace -p 15193 -e 'Thread.new{require "objspace"; ObjectSpace.trace_object_allocations_start; GC.start(full_mark: true); ObjectSpace.dump_all(output: File.open("heap.json","w"))}.join'
#
#
require 'set'
require 'json'
if ARGV.length != 2
puts "Usage: diff_heaps [ORIG.json] [AFTER.json]"
exit 1
end
origs = Set.new
File.open(ARGV[0], "r").each_line do |line|
parsed = JSON.parse(line)
origs << parsed["address"] if parsed && parsed["address"]
end
diff = []
File.open(ARGV[1], "r").each_line do |line|
parsed = JSON.parse(line)
if parsed && parsed["address"]
diff << parsed unless origs.include? parsed["address"]
end
end
diff.group_by do |x|
[x["type"], x["file"], x["line"]]
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end.map { |x, y|
[x, y.count]
}.sort { |a, b|
b[1] <=> a[1]
}.each { |x, y|
puts "Leaked #{y} #{x[0]} objects at: #{x[1]}:#{x[2]}"
}