HTML version of Scripted Foils prepared 11 November 1996

Foil 21 Latency and Bandwidth of a Network

From CPS615-Lecture on Computer Architectures and Networks Delivered Lectures of CPS615 Basic Simulation Track for Computational Science -- 12 September 96. by Geoffrey C. Fox *
Secs 168.4
1 Transmission Time for message of n bytes:
2 T0 + T1 n where
3 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
4 T0 = TS + Td . Number of hops
5 T1 is the inverse bandwidth -- it can be made small if pipe is large size.
6 In practice TS and T1 are most important and Td is unimportant
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