How not to use fork

forking_do_it.rb

# Doing this will likely kill your machine
very_large_array.each do |array_item|
  fork do
    cpu_intensive_task(array_item)
  end
end

# This however will lower the changes of that happening.
CPU_CORE_COUNT = 4
very_large_array.each_slice(CPU_CORE_COUNT).each do |smaller_array|
  smaller_array.each do |array_item|
    fork do
      cpu_intensive_task(array_item)
    end
  end
  Process.waitall
end