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	SCHEDULE: NOV 11-17, 2006 Application Controlled Parallel Asynchronous IO Session: Poster Reception Event Type: Poster Time: 5:15pm - 7:15pm Author(s): Shujia Zhou, Amidu Oloso, Megan Damon, Tom Clune Location: Ballroom Corridor Abstract: Filesystems continue to be a major performance bottleneck for many applications across a variety of hardware architectures. Most existing attempts to address this issue, e.g., PVFS, rely upon system resources which are not typically tuned for any specific user application, whereas others rely on special hardware capabilities such as shared-memory. We have developed an MPI-based parallel asynchronous I/O (PAIO) software package which enables applications to balance compute and I/O resources directly. PAIO uses a queueing mechanism to stage the data, sent over in parallel from compute nodes, on the reserved I/O nodes. Because the bandwidth of the inter-processor network greatly exceeds that of the filesystem, significant performance improvements can be achieved under a bursty I/O load provided sufficient memory is available for the I/O nodes. The results of PAIO for typical weather applications on an SGI Altix and other architectures will be reported in a poster board. Chair/Author Details: Shujia Zhou NASA GSFC Amidu Oloso NASA GSFC Megan Damon NASA GSFC Tom Clune NASA GSFC
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