Shows memory usage as the Gmail gem is reading emails and attachments

email.rb

require 'rubygems'
require 'gmail'
require 'memprof'
require 'logger'

def memory_usage
  (((`ps -o rss= -p #{Process.pid}`.to_i / 1024.0) * 100).ceil / 100.0).to_s + ' MB'
end

log = Logger.new(STDOUT)

log.debug "START #{memory_usage}"
GMAIL = Gmail.connect!('anonymous@example.com','password')
log.debug "  Gmail initialized #{memory_usage}"

Memprof.start
emails = GMAIL.inbox.find(:unread)
log.debug "  retrieve inbox #{memory_usage}"
emails.each_with_index do |email,i|
  log.debug "    email #{i}, about to read #{memory_usage}"
  email.attachments
  log.debug "    message read #{memory_usage}"
end

log.debug "END #{memory_usage}"
Memprof.stats
Memprof.stop