新随笔

Table of Contents

• 1. 课件：The Memory Hierachy

1. 课件：The Memory Hierachy

1. The memory abstraction
   
   • the bus
     
   • movq A, %rax
     
   • movq %rax, A
     
   1. Note
      
2. RAM : main memory building block
   
   • RAM: SRAM, DRAM
     
   • SDRAM, DDR SDRAM
     
   • Nonvalatile Memories
     
   • ROM, PROM, EPROM, EEPROM, Flash Memory
     
   • RAM Organization
     
     • d × w DRAM, supercells
       
     • RAS and CAS
       
     • memory module
       
3. Storage technologies and trends
   
   • Magnetic Disks, Flash memory
     
   • arm, spindle, platters, actuator, etc.
     
   • surfaces, tracks, sectors(&gaps)
     
   • cylinder
     
   • Capacity: recording density, track density, areal density
     
   • recording zones
     
   • disk access time:
     
     • seek time
       
     • rotational latency
       
     • transfer time
       
   • I/O Bus: reading a disk sector.
     
   • solid state disks(SSDs)
     
4. Locality of reference
   
   • principle of locality
     
     • temporal locality
       
     • spatial locality
       
   • estimating locality
     
   • memory hierarchy
     
5. Caching in the memory hierarchy
   
   • example memory hierachy: L0 Regs, L1-3 cache(SRAM), L4 memory(DRAM), L5 local disks, L6 remote storage
     
   • caches
     
   • why work? locality.
     
   • big idea
     
   • cache misses: cold, conflict, capacity.
     
6. Summary
   
   • speed gap: widening.
     
   • good code: locality.
     
   • caching: close gap.
     

Date: 2022-10-26 Wed

Author: Gefei Chen

Created: 2022-11-15 二 11:19

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