More memory profiling

spec/model_spec.rb

@@ -1,14 +1,14 @@
 require 'spec_helper'
 require 'memory_profiler'
 
+def Process.rss; `ps -o rss= -p #{Process.pid}`.chomp.to_i; end
+
 describe Ebooks::Model do
   it "does not use a ridiculous amount of memory" do
-    RubyProf.start
-    Ebooks::Model.consume(path("data/0xabad1dea.json"))
-    result = RubyProf.stop
+    report = MemoryUsage.report do
+      model = Ebooks::Model.consume(path("data/0xabad1dea.json"))
+    end
 
-    require 'pry'; binding.pry
-
-    expect(report.total_retained).to be < 100000
+    expect(report.total_memsize).to be < 1000000000
   end
 end