heap_bloater.rb

@preallocate = []
500_000.times do
  @preallocate << ""
end

def process_request
  allocate = rand(80_000) + 20000
  req = []
  allocate.times do
    req << " " * rand(1000)
  end
end

def stats(i)
  puts "Heap length: #{GC.stat[:heap_sorted_length]} iterations: #{i} slots #{GC.stat[:heap_available_slots]} GC counts: #{GC.stat[:minor_gc_count]}/#{GC.stat[:major_gc_count]} old_objects #{GC.stat[:old_objects]}"
end

i = 0

@heap_length = GC.stat[:heap_sorted_length]

stats(0)

while true
  i += 1
  process_request

  #GC.start(full_mark: true)

  if @heap_length < GC.stat[:heap_sorted_length]
    @heap_length = GC.stat[:heap_sorted_length]
    stats(i)
  end
end

https://gist.github.com/SamSaffron/b8e06a9873034575dacef82f4123a604#file-heap_bloater-rb-L12

Did you intend req << " " * rand(1000) ?

good point, I should fix that @funny-falcon , I actually want to generate data that looks more like a real request, so I should get a more accurate sampling of a real req and then regenerate that