Below is a summary of the Java 7 results.


Cluster size Call Rate Event Rate SIP message Rate Results

One node


3702 events/s

8021 messages/s

Two nodes


6546 events/s

14,183 messages/s

Three nodes


8628 events/s

18,694 messages/s

Four nodes over two domains


11,940 events/s

25,870 messages/s

Types of graphs

The individual test results include four types of graphs:


Total throughput (calls per second) of a cluster over the course of the test run. The "ramp-up" period at the start of each run is required because the load generators are Java programs, which need time for the JVM to perform its compilation and optimisation of Java code. (If we did not use a ramp-up period, the load generators would be overloaded initially, which would skew the results.)

Response Times

Distribution of response-time changes during the course of the test run.

Response Time Distribution

Overall distribution of response times from the entire test run.

CPU Utilization

Percentage of CPU used on Rhino servers, as measured by vmstat.


Heap usage.

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