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module Heapy
# Used for inspecting contents of a heap dump
#
# To glance all contents at a glance run:
#
# Analyzer.new(file_name).analyze
#
# To inspect contents of a specific generation run:
#
# Analyzer.new(file_name).drill_down(generation, Float::INFINITY)
class Analyzer
def initialize(filename)
@filename = filename
end
def read
File.open(@filename) do |f|
f.each_line do |line|
begin
parsed = JSON.parse(line)
yield parsed
rescue JSON::ParserError
puts "Could not parse #{line}"
end
end
end
end
def drill_down(generation_to_inspect, max_items_to_display)
puts ""
puts "Analyzing Heap (Generation: #{generation_to_inspect})"
puts "-------------------------------"
puts ""
generation_to_inspect = Integer(generation_to_inspect) unless generation_to_inspect == "all"
memsize_hash = Hash.new { |h, k| h[k] = 0 }
count_hash = Hash.new { |h, k| h[k] = 0 }
string_count = Hash.new { |h, k| h[k] = Hash.new { |h, k| h[k] = 0 } }
reference_hash = Hash.new { |h, k| h[k] = 0 }
read do |parsed|
generation = parsed["generation"] || 0
if generation_to_inspect == "all".freeze || generation == generation_to_inspect
next unless parsed["file"]
key = "#{ parsed["file"] }:#{ parsed["line"] }"
memsize_hash[key] += parsed["memsize"] || 0
count_hash[key] += 1
if parsed["type"] == "STRING".freeze
string_count[parsed["value"]][key] += 1 if parsed["value"]
end
if parsed["references"]
reference_hash[key] += parsed["references"].length
end
end
end
raise "not a valid Generation: #{generation_to_inspect.inspect}" if memsize_hash.empty?
total_memsize = memsize_hash.inject(0){|count, (k, v)| count += v}
# /Users/richardschneeman/Documents/projects/codetriage/app/views/layouts/application.html.slim:1"=>[{"address"=>"0x7f8a4fbf2328", "type"=>"STRING", "class"=>"0x7f8a4d5dec68", "bytesize"=>223051, "capacity"=>376832, "encoding"=>"UTF-8", "file"=>"/Users/richardschneeman/Documents/projects/codetriage/app/views/layouts/application.html.slim", "line"=>1, "method"=>"new", "generation"=>36, "memsize"=>377065, "flags"=>{"wb_protected"=>true, "old"=>true, "long_lived"=>true, "marked"=>true}}]}
puts "allocated by memory (#{total_memsize}) (in bytes)"
puts "=============================="
memsize_hash = memsize_hash.sort {|(k1, v1), (k2, v2)| v2 <=> v1 }.first(max_items_to_display)
longest = memsize_hash.first[1].to_s.length
memsize_hash.each do |file_line, memsize|
puts " #{memsize.to_s.rjust(longest)} #{file_line}"
end
total_count = count_hash.inject(0){|count, (k, v)| count += v}
puts ""
puts "object count (#{total_count})"
puts "=============================="
count_hash = count_hash.sort {|(k1, v1), (k2, v2)| v2 <=> v1 }.first(max_items_to_display)
longest = count_hash.first[1].to_s.length
count_hash.each do |file_line, memsize|
puts " #{memsize.to_s.rjust(longest)} #{file_line}"
end
puts ""
puts "High Ref Counts"
puts "=============================="
puts ""
reference_hash = reference_hash.sort {|(k1, v1), (k2, v2)| v2 <=> v1 }.first(max_items_to_display)
longest = count_hash.first[1].to_s.length
reference_hash.each do |file_line, count|
puts " #{count.to_s.rjust(longest)} #{file_line}"
end
if !string_count.empty?
puts ""
puts "Duplicate strings"
puts "=============================="
puts ""
value_count = {}
string_count.each do |string, location_count_hash|
value_count[string] = location_count_hash.values.inject(&:+)
end
value_count = value_count.sort {|(k1, v1), (k2, v2)| v2 <=> v1 }.first(max_items_to_display)
longest = value_count.first[1].to_s.length
value_count.each do |string, c1|
puts " #{c1.to_s.rjust(longest)} #{string.inspect}"
string_count[string].sort {|(k1, v1), (k2, v2)| v2 <=> v1 }.each do |file_line, c2|
puts " #{c2.to_s.rjust(longest)} #{file_line}"
end
puts ""
end
end
end
def analyze
puts ""
puts "Analyzing Heap"
puts "=============="
default_key = "nil".freeze
# generation number is key, value is count
data = Hash.new {|h, k| h[k] = 0 }
mem = Hash.new {|h, k| h[k] = 0 }
total_count = 0
total_mem = 0
read do |parsed|
data[parsed["generation"] || 0] += 1
mem[parsed["generation"] || 0] += parsed["memsize"] || 0
end
data = data.sort {|(k1,v1), (k2,v2)| k1 <=> k2 }
max_length = [data.last[0].to_s.length, default_key.length].max
data.each do |generation, count|
generation = default_key if generation == 0
total_count += count
total_mem += mem[generation]
puts "Generation: #{ generation.to_s.rjust(max_length) } object count: #{ count }, mem: #{(mem[generation].to_f / 1024).round(1)} kb"
end
puts ""
puts "Heap total"
puts "=============="
puts "Generations (active): #{data.length}"
puts "Count: #{total_count}"
puts "Memory: #{(total_mem.to_f / 1024).round(1)} kb"
end
end
end
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