Gotcha: An Function-Wrapping Interface For Hpc Tools

This paper introduces Gotcha, a function wrapping interface and library for HPC tools. Many HPC tools, and performance analysis tools in particular, rely on function wrapping to integrate with applications. But existing mechanisms, such as LD PRELOAD on Linux, have limitations that lead to tool instability and complexity. Gotcha addresses the limitations in existing mechanisms, provides a programmable interface for HPC tools to manage function wrapping, and supports function wrapping across multiple tools. In addition, this paper introduces the idea of interface-independent function wrapping, which makes it possible for tools to wrap arbitrary application functions.