[Operating System] {ud923} P4L3: Distributed Shared Memory

 

 

 

 

Visual Metaphor

 

 

 

 Reviewing DFSs

 

 

 

 

 Peer Distributed Applications

 

 

 

 

 Hardware vs Software DSM

 

NIC => network interconnect card

 

 

 

 

 

 Distributed Shared Memory: Concepts and Systems

 

 

 

 

 DSM Design: Sharing Granularity

 

 

 

 DSM Design: Access Algorithm

 

 

 

 

 DSM Design: Migration vs Replication

 

 

clearly, accessing local memory is faster than remote memory.

so what can we do in order to maximize the number of cases where local memory's accessed versus remote

 

 

 

 

 

 

 

 

DMS Design: Consistency Management 

 

 

trigered when any file is modified or whether its with a period of 5s or 10s or 1ms or in some other manner <= depends on the model for shared state (will be discussed later)

 P3L4 Synchronization Constructs, Morsel on Cache Coherence

 

 

 

DSM Architecture 

 

 

 

 

Summarizing DSM Architecture 

 

 

 

Indexing Distributed State 

 

 

 

 

Implementing DSM 

 

 

 What is a Consistency Model

 

 

 

 Strict Consistency

 

 

 

 

 

 Sequential Consistency

 

 

 

 

Causal Consistency 

 

 

 

 

 Weak Consistency

 

 

 

 

 

 

 

 

 

 

 

ERRATA

This is sequentially consistent too, since m1=0 isn't a result of a particular write operation, so both P3 and P4 observe that m2 has changed, and m1 hasn't.

 

 

 

 

 

 

 

 

 

 

 

 

 

---

 

https://www.cs.helsinki.fi/webfm_send/1256

 

 

---