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Collaborative Enhancements in High-Performance I/O and Climate Applications

This document outlines a proposal for collaborative efforts focused on enhancing high-performance input/output (I/O) operations in scientific applications, particularly in climate modeling and supernova simulations. It emphasizes cooperation among various national laboratories and universities to improve MPI-IO interfaces, investigate API strategies, and leverage insights from applications. Key activities include establishing testbed access, evaluating protocols like GridFTP and PVFS, and proposing multi-year campaigns with specific deliverables aimed at refining I/O processes and performance across diverse platforms.

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Collaborative Enhancements in High-Performance I/O and Climate Applications

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  1. Applications • In Hand: • FLASH (HDF-5) • ENZO (MPI-IO) • STAR • Likely • Climate – Bill G to contact (Michalakas (NetCDF?), Drake (??)) • Supernovae – Randy to contact (ORNL contact is Ross Toedte (rjt@ornl.gov))

  2. Task Cooperation • Testbed access • Probe (ORNL) and ChibaCity (ANL) • Look into making some compute cycles available as well to attract applications • WAN Communication (TCP mods/replacements) • ANL, ORNL • MPI-IO over HPSS • ANL, NWU, ORNL (+LLNL?) to evaluate • GridFTP experience • LBNL, ANL • PVFS/MPI-IO Hints • ANL, NWU • Secondary/Tertiary Integration (pipelining) • ANL, NWU, LBNL, …

  3. “Campaigns” • Definition: • Multi-group efforts • Deliverables in the first year • Candidates: • Hints through MPI-IOROMIOPVFS for applications • NetCDF MPI-IO (coord with climate apps) • Opportunities in HSM, WAN performance, others

  4. Other Tasks • Many enhancements to tools (PVFS, ROMIO, HRM) • Investigations of APIs, strategies • Exploit applications for insight • Cross-cultural APIs (e.g., HSI, Grid IO, MPI-IO interactions) • Year 2-3 tasks • Further enhancements (per proposal) • Opportunities: • Secondary/Tertiary I/O pipelining

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