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Test Client

• zk-latencies.py from http://github.com/phunt/zk-smoketest^{Image Removed} was used as the test client.
• python 2.4.3

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In the following graph you can see the results of this experiment for a single Standalone serving instance. The X axis shows the number of operations per second that were processed by the server for 1, 2 & 4 cores, where 1, 10 & 20 clients were testing the cluster.

From the graph and the data below we can see that moving from a workload of 1 to 10 clients shows an increase in overall operations performed by the server. However moving from 10 to 20 clients we see no further increase (rather some decrease, potentially due to the overhead of selector processing and connection management in the server networking code). Increasing the number of cores provides modest increase in the overall output of the server. This makes sense as there are a limited number of threads running in a standalone server, it is unable to take advantage of the additional cores.

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Here we see distinct increase in the output of the cluster as we move the workload from 1 to 10 to 20 clients. There is some additional headroom that we could see if we were to test with higher workloads. Additionally as the core count increases we see output gains there as well. Ensemble servers are running additional threads to process the quorum communication, these threads are taking advantage of the additional parallelism.

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