SUMMARYJava is becoming a viable platform for real-time computing. There are production and research realtime Java VMs, as well as applications in both the military and civil sectors. Technological advances and increased adoption of real-time Java contrast significantly with the lack of benchmarks. Existing benchmarks are either synthetic micro-benchmarks, or proprietary, making it difficult to independently verify and repeat reported results. This paper presents the CD x benchmark, a family of open-source implementations of the same application that target different real-time virtual machines. CD x is, at its core, a real-time benchmark with a single periodic task, which implements an idealized aircraft collision detection algorithm. The benchmark can be configured to use different sets of real-time features and comes with a number of workloads. It can be run on standard Java virtual machines, on real-time and Safety Critical Java virtual machine, and a C version is provided to compare with native performance.

Java is becoming a viable platform for hard real-time computing. There are production and research real-time Java VMs, as well as applications in both military and civil sector.