simple redis memory analysis script

script/redis_memory.rb

@@ -0,0 +1,28 @@
+require File.expand_path("../../config/environment", __FILE__)
+
+@redis = $redis.without_namespace
+
+stats = {}
+
+@redis.scan_each do |k|
+  type = @redis.type k
+  debug = @redis.debug :object, k
+  len = debug.split("serializedlength:")[1].to_i
+
+  case type
+  when "zset"
+    elems = @redis.zcard k
+  when "list"
+    elems = @redis.llen k
+  when "hash"
+    elems = @redis.hlen k
+  end
+
+  stats[k] = [len, type, elems]
+end
+
+puts "Top 100 keys"
+stats.sort{|a,b| b[1][0] <=> a[1][0]}.first(50).each do |k, (len, type, elems)|
+  elems = " [#{elems}]" if elems
+  puts "#{k} #{type} #{len}#{elems}"
+end