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Solving the import problem: Scalable Dynamic Loading Network File Systems

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The most common programming paradigm for scientific computing, SPMD (Single Program Multiple Data), catastrophically interacts with the loading strategies of dynamically linked executables and network-attached file systems on even moderately sized high performance computing clusters. This difficulty is further exacerbated by "function-shipped" I/O on modern supercomputer compute nodes, preventing the deployment of simple solutions. In this talk, we introduce a two-component solution: collfs, a set of low-level MPI-collective file operations that can selectively shadow file system access in a library, and walla, a set of Python import hooks for seamlessly enabling parallel dynamic loading scalable to tens of thousands of cores.

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