Basic HTML version of Foils prepared 23 August 1998

Foil 22 Sequential Memory Structure

From CPS615-Introduction-Course,Driving Technology and HPCC Current Status and Futures CPS615 Basic Simulation Track for Computational Science -- Fall Semester 98. by Geoffrey C. Fox, (Some Culler, Koelbel material)
Data locality implies CPU finds information it needs in cache which stores most recently accessed information
This means one reuses a given memory reference in many nearby computations e.g.
A1 = B*C
A2 = B*D + B*B
.... Reuses B
Processor
Cache
L2 Cache
L3 Cache
Main
Memory
Disk
Increasing Memory
Capacity Decreasing
Memory Speed (factor of 100 difference between processor
and main memory
speed)

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