SGI 10-Gigabit Ethernet Network Adapter Uživatelský manuál stáhnout pdf (Strana 58)

• Basic unit of switching is a crossbar

– Current InfiniBand products use either 24-port (DDR) or 36-port

(QDR) crossbars

• Switches available in the market are typically collections of

crossbars within a single cabinet

• Do not confuse “non-blocking switches” with “crossbars”

– Crossbars provide all-to-all connectivity to all connected nodes

• For any random node pair selection, all communication is non-blocking

– Non-blocking switches provide a fat-tree of many crossbars

• For any random node pair selection, there exists a switch

configuration such that communication is non-blocking

• If the communication pattern changes, the same switch configuration

might no longer provide fully non-blocking communication

CCGrid '11

Switch Complex

1 2 ... 53 54 55 56 57 58 59 60 61 62 63 ... 149 150

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SGI 10-Gigabit Ethernet Network Adapter Uživatelský manuál Strana 58