gistfile1.rb

require 'csv'

def memstats
  size = `ps -o size= #{$$}`.strip.to_i
end

memstats #4900
CSV.open('visitors.csv', headers: true) do |csv|
	visitors = csv.each # Enumerator
	memstats # 5164
	visitors.count{|v| v['Geolocation'] =~ /San Francisco/}
end
memstats #5164