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From "Oliver B. Fischer" <>
Subject Performance measurement framework for Mathout
Date Tue, 03 Jan 2012 22:27:01 GMT

I am working for some time on Thotti. Thotti aims to be a performance 
measurement framework for Mahout. It allows you to monitor the 
performance of Mahout and compare different setups (JVM settings, Mahout 

Thotti allows you to define your own test cases with normal Java classes 
and annotations in a very similar manner to TestNG and similar 
frameworks. At the moment only non-distributed tests can be executed, 
but it is planned to suppport distributed tests too.

For test execution Thotti utilizes currently EC2 instances and contains 
a component to manage EC2 instances (creation, termination). It also 
makes heavy use of S3 to store distribute test, test data and test 
result. But with a little bit work it can be extended to support 
different cloud services or local servers.

Since Thotti is now stable enough for non-distributed tests I would like 
to implement a reference test suite for Mahout for non-distributed 

To build this reference test suite I need your help. Please send me your 
test cases. Thotti is able to run the same test multiple times, with 
different JVM settings and differerent parameters. So you can send me 
your test cases and test data along with different test setups.

The example test case below will be executed by Thotti once. The JVM 
will run with -server.

public class SimpleRecommenderTest {
     @NDTest(id = "BForJVM909",
             run = @Run(jvmArgs = @JVMArgs(id = "jvm909", value = 
     public void executeTest() throws IOException, TasteException {
         DataModel model = new FileDataModel(prependDataDir(new 

         UserSimilarity similarity = new 

         UserNeighborhood neighborhood =
                 new NearestNUserNeighborhood(2, similarity, model);

         Recommender recommender = new GenericUserBasedRecommender(
                 model, neighborhood, similarity);

         recommender.recommend(1, 1);

I would be gratefull for your support on this work.



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