Runtime Support for Parallel I/O in PASSION

We are developing a compiler and runtime support system called PASSION: Parallel And Scalable Software for Input-Output, to translate out-of-core data-parallel programs to message passing node programs with explicit parallel I/O. This paper describes the design and implementation of the runtime system used in PASSION. We explain the basic model used by the compiler and runtime system. We describe the runtime routines for regular problems and provide an initial framework for runtime support for out-of-core irregular problems. Preliminary performance results are presented for 2D FFT and Laplace equation solver, and a kernel from a molecular dynamics code. This work was supported in part by NSF Young Investigator Award CCR-9357840, a grant from Intel SSD, and IBM, and in part by USRA CESDIS Contract # 5555-26. This work was performed in part using the Intel Touchstone Delta System operated by Caltech on behalf of the Concurrent Supercomputing Consortium. Access to this facility was provided by CRPC.