Every long-lived software project accumulates technical debt. In HPC — where compilers, runtimes, test infrastructure, and tools are deeply entangled, and where correctness and performance are both non-negotiable — it can feel insurmountable. At HPSFCon 2026, Jade Abraham of HPE shared how the Chapel team confronts this reality after more than two decades of development.
“Paying Down Tech Debt: The Challenges of Maintaining Legacy Code in HPC” resonates well beyond Chapel’s user base. In a project like Chapel, the compiler, runtime, test infrastructure, and tools are so deeply interdependent that touching one piece almost always means touching all of them. Hardware also evolves faster than in most domains — staying performant on each new generation of processors, GPUs, and accelerators requires constant adaptation that competes directly with cleanup work.
What the talk offers isn’t just a diagnosis, but concrete strategies: how the Chapel team identifies the most impactful areas of debt, how they make the internal case for investing in maintainability, and how they manage interdependencies that make HPC codebases particularly fragile to refactor. The challenges are universal. The strategies are practical and transferable.
View the full playlist from HPSFCon 2026: https://www.youtube.com/playlist?list=PLRKq_yxxHw29oZTboj6fmdYhQMWHUaj4u.