This application has benchmarks for the three main libraries for GAE: Pipeline--http://code.google.com/p/appengine-mapreduce MapReduce--http://code.google.com/p/fantasm Fantasm--http://code.google.com/p/appengine-pipeline The benchmarks include: Wordcount Aggregation Join Subset Grep The code layout: - data # Contains code to generate data and delete it - wordcount # Counts the number of times each word comes up - join # Joins two tables based on a property field - grep # Search for a needle in a haystack - aggregate # Count up an integer on an entire entity kind - subset # Aggregate but only on a subset of entities