Add Redis source code for testing

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diff --git a/examples/redis-unstable/utils/lru/README b/examples/redis-unstable/utils/lru/README
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+The test-lru.rb program can be used in order to check the behavior of the
+Redis approximated LRU algorithm against the theoretical output of true
+LRU algorithm.
+
+In order to use the program you need to recompile Redis setting the define
+REDIS_LRU_CLOCK_RESOLUTION to 1, by editing the file server.h.
+This allows to execute the program in a fast way since the 1 ms resolution
+is enough for all the objects to have a different enough time stamp during
+the test.
+
+The program is executed like this:
+
+    ruby test-lru.rb /tmp/lru.html
+
+You can optionally specify a number of times to run, so that the program
+will output averages of different runs, by adding an additional argument.
+For instance in order to run the test 10 times use:
+
+    ruby test-lru.rb /tmp/lru.html 10