FEATURE: improve memory reporting of /admin/memory_stats

app/controllers/admin/diagnostics_controller.rb

@@ -3,20 +3,7 @@ class Admin::DiagnosticsController < Admin::AdminController
   skip_before_filter :check_xhr
 
   def memory_stats
-
+    render text: memory_report, content_type: Mime::TEXT
-    begin
-      # ruby 2.1
-      GC.start(full_mark: true)
-    rescue
-      GC.start
-    end
-
-    stats = GC.stat.map{|k,v| "#{k}: #{v}"}
-    counts = ObjectSpace.count_objects.map{|k,v| "#{k}: #{v}"}
-
-    render text: "GC STATS:\n#{stats.join("\n")} \n\nObjects:\n#{counts.join("\n")}",
-      content_type: Mime::TEXT
-
   end
 
   def dump_heap
@@ -34,4 +21,51 @@ class Admin::DiagnosticsController < Admin::AdminController
       render text: "HEAP DUMP:\nnot supported", content_type: Mime::TEXT
     end
   end
+
+  protected
+
+  def memory_report
+    begin
+      # ruby 2.1
+      GC.start(full_mark: true)
+    rescue
+      GC.start
+    end
+
+
+    classes = {}
+
+    ObjectSpace.each_object do |o|
+      begin
+        next if o == classes
+
+        classes[o.class] ||= 0
+        classes[o.class] += 1
+      rescue
+        # all sorts of stuff can happen here BasicObject etc.
+        classes[:unknown] ||= 0
+        classes[:unknown] += 1
+      end
+    end
+
+    stats = GC.stat.map{|k,v| "#{k}: #{v}"}
+    counts = ObjectSpace.count_objects.sort{|a,b| b[1] <=> a[1] }.map{|k,v| "#{k}: #{v}"}
+
+    classes = classes.sort{|a,b| b[1] <=> a[1]}[0..40].map{|klass, count| "#{klass}: #{count}"}
+
+
+    <<TEXT
+#{`hostname`.strip} pid:#{Process.pid} #{`cat /proc/#{Process.pid}/cmdline`.strip.gsub(/[^a-z1-9\/]/i, ' ')}
+
+GC STATS:
+#{stats.join("\n")}
+
+Objects:
+#{counts.join("\n")}
+
+Classes:
+#{classes.join("\n")}
+
+TEXT
+  end
 end