The benchmark used the latest MySQL Cluster version, available on launchpad and to be released as MySQL Cluster 7.2.5. The benchmark program is flexAsynch. Each read is a transaction consisting of a read of an entire row consisting of 25 attributes, each 4 bytes in size. flexAsynch uses the asynchronous feature of the NDB API which enables one thread to send off multiple transactions in parallel. This is handled similarly to how Node.js works with callbacks registered that reports back when a transaction is completed.
I will in a later blog discuss how an application can be designed to make optimal use of the asynchronous API to enable the application to reach these kind of performance numbers for key lookup operations.
The benchmark was executed on a set of 2-socket servers using X5670 with Infiniband interconnect and 48GB of memory per machine. There were 8 data nodes in the cluster and each machine had 1 data node placed in it. There were 10 machines running flexAsynch (1 process per machine).
We reported a similar benchmark a year ago, the results from an 8 data node set-up was 2.1M reads per second (8X improvement) and using 8 machines the set-up was 16 data nodes where we reached 4.3M reads per second (4X improvement). This dramatic improvement is possible since we have made each data node make more effective use of the available hardware threads. Previously each data node exploited about 6 CPUs with 8 threads, in this benchmark we used about 14 CPUs with 24 threads. We've also removed a number of bottlenecks and the configuration of the threads is done in such a manner as to handle many different loads well.
We have also improved the update numbers from 1.3M updates per second in an 8-node setup to now reaching 1.9M updates per second in a similar set-up.
The scripts required to run the benchmark are available on our benchmark page. We've placed the configuration file used to drive the benchmark in the dbt2-0.37.50 tarball in the examples directory.
You can learn more about all of the enhancements in MySQL Cluster 7.2 from our Developer Zone article.