iram and istore
Post on 06-Jan-2016
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IRAM and ISTORE
David Patterson, Katherine Yelick, John Kubiatowicz
U.C. Berkeley, EECS
http://iram.cs.berkeley.edu/{istore}
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IRAM Overview• Low power, high performance
processor for multimedia• Mixed logic and DRAM
– On-chip bandwidth, low power
• Vector processing– Parallelism replace high
clock» 200 MHz, 3.2 Gflops, 2 Watts
– Simple issue and control logic (power, area)» Push complexity into compiler; well-understood
model
• Compare to SIMD media extensions (MMX, VIS,…)– Multimedia has fine-grained data
parallelism.– Scalable, multi-generation instruction set
• Working with application experts (video and speech)
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ISTORE Overview• Two kill applications for future
– Storage and retrieval• Design points
– 2000: 80 nodes in 3 racks– 2001: 1000 nodes with IBM
(?)– 2005: 10K nodes in 1 rack (?)
» Add IRAM to 1” disk• Key problems are availability, maintainability, and evolutionary growth (AME) of a thousand node servers
• Approach•Hardware built for availability: monitor,
diagnostics•New class of benchmarks for AME•Reliable systems from unreliable hw/sw
components• Introspection: the system watches itself
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