lect22-parallel-io

lect22-parallel-io - Notes Group Project presentations next...

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CMSC 714 Lecture 22 Parallel I/O Alan Sussman 2 Notes ! Group Project presentations next Tuesday/Thursday email sent with (approximate) schedule final report due Wed., Dec. 14 ! Course evaluation web site open – http://www.CourseEvalUM.umd.edu 3 IBM GPFS ! Designed to support high throughput parallel applications, including multimedia well suited for scientific computations still used in many of Top 500 supercomputers ! Main idea is to use parallel I/O to increase performance and scale to large configurations increase bandwidth by spreading reads and writes (even to a single file) across multiple disks, especially for sequential access avoid the “one file per parallel process” model, or sending all I/O through one node use internal high performance switch, plus separate I/O nodes, for I/O from parallel processes running on nodes files can be both striped across multiple I/O nodes, and across multiple disks in each I/O node 4 IBM GPFS !
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