2026/06/30 by Khashayar Etemadi, Zhendong Su
#cs.SE
Automated fixing of performance issues is gaining attention, but existing benchmarks of execution time improvement patches (ETIPs) target Python, C++, or .NET and are fixed datasets that cannot be extended under user-defined configurations. We present JETO-Mine, the first configurable and reusable tool for automatically creating reproducible benchmarks of ETIPs in real-world Java projects. Java is challenging because just-in-time compilation and garbage collection make execution measurements volatile. JETO-Mine employs a three-phase pipeline: static analysis identifies ETIPs from GitHub repositories using user-defined filters and an LLM-based issue classifier, dynamic analysis wraps identified ETIPs in Docker images and performs statistical testing for evidence of execution time improvement, and an evaluation harness supports quantitative assessment of both patch and test generation tools. Using JETO-Mine, we build JETO-Bench, a benchmark of 660 identified and 91 manually verified executable ETIPs from 174 Java repositories, mined from nearly 1.8 million commits across 11 years. Running OpenHands with GPT-5-mini fixes 14.3% (13/91) of issues, aligning with prior work on other languages. Our results also reveal that open-source Java projects largely lack tests demonstrating execution time improvements, presenting an opportunity for future research in test generation. JETO-Mine and JETO-Bench are publicly available at https://github.com/khesoem/JETO-Bench.