SPECjbb2015

SPECjbb2015 is a Java microbenchmark test suite released by the Standard Performance Evaluation Corporation (SPEC) to assess Java Virtual Machine (JVM) performance under realistic, multi‑threaded workloads. It is the successor to earlier SPECjbb versions, incorporating newer Java language features and a broader set of evaluation scenarios. The benchmark models a Java Enterprise Edition (J2EE) web application that simulates order processing for a hypothetical retail chain. It measures the time required to commit a transaction, handle client requests, and process background tasks such as rendering product pages and user authentication.

The test harness includes a preset configuration of server, client, and transaction mix parameters that emulate an average concurrent user base ranging from 10 to 800. Benchmark results are expressed as "JAVA throughput" and "JAVA latency," analogous to SPECspeed and SPECpower in other SPEC suites. The results are compared against a baseline reference system to compute a normalized performance metric called SPECrate.

SPECjbb2015 is widely used in academic research, industry performance assessments, and as a benchmark for tuning JVM optimizations such as garbage collection and JIT compilation. Its open‑source implementation and clear scoring methodology make it a standard tool for evaluating Java platform scalability.