HELP! * YELLOW=global GREY=local Global HTML version of Foils prepared July 6 1996

Foil 19 Latency and Bandwidth of a Network

From HPCC Current Status: Hardware MPP Trip to China -- July 12-28,96. by Geoffrey Fox * Critical Information in IMAGE
Transmission Time for message of n bytes:
T0 + T1 n where
T0 is latency containing a term proportional to number of hops. It also has a term representing interrupt processing time at beginning at and for communication network and processor to synchronize
T0 = TS + Td . Number of hops
T1 is the inverse bandwidth -- it can be made small if pipe is large size.
In practice TS and T1 are most important and Td is unimportant
Northeast Parallel Architectures Center, Syracuse University, npac@npac.syr.edu

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