lec29 - ± Topologies with switches separate from nodes:...

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LECTURE - 29
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Lecture Outline ± Interconnection networks ± IBM's Blue Gene ± I/O and Buses ± ± Scribe for today?
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Interconnection Networks ± Networks at three levels: ² Massively Parallel Processor (MPP) Network, within about 25m max ² LAN: within about a few km max ² WAN: larger ± Latency is higher in WAN ± Cost of redundancy is higher in WAN
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Switching versus Routing ± Switching: setup switches between source and destination ± Routing: treat each packet individually ± Switching: ² Switches separate from processors ² Switches associated with processors ± Wormhole routing and cut-through routing are other possibilities
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MPP Network Topology Design ± Design Criteria ² Minimum cost, Bisection bandwidth, Link/Node fault tolerance
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Unformatted text preview: ± Topologies with switches separate from nodes: cross-bar, omega network ± Topologies with switches as part of nodes: ring, 2-D torus, n-D hypercube IBM's Blue Gene. .. Input/Output ± We will mostly talk about storage systems ± I/O performance is important! ± Magnetic disks ² Platter, head, track, sector, cylinder ± Seek time, rotational delay, transfer time ± Disk controller, controller delay ± Queuing delay Storage Technologies ± Magnetic disks, and the access time gap ± Solid state disks, Expanded storage using DRAMs ± Optical storage (read only) ± Magnetic tapes ² Same technology as disks ² Difference in geometry ==> cheaper but slower...
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lec29 - ± Topologies with switches separate from nodes:...

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