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Memory Hierarchy Technology

ACA
by

Ishita Rastogi

on 9 October 2012

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Transcript of Memory Hierarchy Technology


(ACA) Memory Hierarchy Technology Great
grandfather Hierarchy Grand father Father Child Memory Hierarchy Access time
Memory size
Cost per byte
Transfer bandwidth
Unit of transfer 5 parameters that characterises memory technology and Memory organisation are: Access time Memory size Size
Access
Cost
Bandwidth
Unit of transfer Memory devices at lower level have following characteristics: Cost per byte Transfer Bandwidth Unit of transfer Registers & Caches Main memory Disk Drives & Tape Units Peripheral Technology Inclusion
Coherence
Locality Information stored in memory hierarchy satisfies 3 properties: Program 1 -------> Inclusion Coherence Property There are 3 dimensions of the Locality property :- Locality of reference It says that each type of locality affects the design of the memory hierarchy:

The temporal locality leads to the popularity of the least recently used (LRU) replacement algorithm.
The Spatial locality assists us in determining the size of unit data transfers between adjacent memory levels.
The Sequential locality affects the determination of grain size for optimal scheduling (Grain Packaging). Memory Design Implication Group members:
Gaurav Singla
Ginna Yadav
Harmohit Singh Gaba
Harshit Bhatia
Inayat Miglani
Ishita Rastogi Thank You Things are generally placed where they are actually needed. Temporal locality: Temporal locality tends to cluster the access in recently used areas Spatial locality: Program segments tend to be stored in the same segment of the memory space. Sequential Locality: Execution of instruction follows sequential order, step by step; so sequential locality <-------Program 2 Information segment
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