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- Not straightforward to program. Without parallelism, performance only
100 MFLOP.
- With full interconnection, communications can be very fast: data
can be exchanged with other processors every few instructions
- If all processors choose to communicate with the same
processor all at once, performance is still determined by the
performance of one processor.
- We need some cleverer way of connecting the processors,
to reduce the amount of wire:
- need high point-to-point bandwidth
- need low delivery delay (``latency'')
- need high overall capacity (``bisection
bandwidth'')