Symmetric and distributed shared memory architecture pdf portfolio

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    3. What is DSM? The distributed shared memory (DSM) implements the shared memory model in Distributed Systems, which have no physical shared memory. The shared memory model provides a virtual address space shared between all nodes. This overcomes the high cost of communication in distributed systems. DSM systems move data to the location of Access.
    Distributed Shared Memory on Ericsson Labs Ericsson Labs. message passing vs shared memory Hamza Zahid 1 of 12. 1 of 12. Centralized shared memory architectures Nov. 15, 2016 • 1 like • 7,863 views Report Centralized shared memory architectures
    A. Kshemkalyani and M. Singhal (Distributed Computing) Distributed Shared Memory CUP 2008 12 / 48. Distributed Computing: Principles, Algorithms, and Systems Sequential Consistency using Local Reads (shared var) int: x; (1) When the Memory Manager at P i receives a Read or Write from application:
    Synchronization: shared memory locks Shared memory Threads E.g., pthreads memory lock-8-Ultracomputer Design P0 P1 M0 M1 Network Shared Memory This is a butterfly network – variant of Omega network Concept built as IBM RP3 machine (we will see this later) • Indirect network – Omega network (details later in course) • Shared memory machine
    Key Points. Shared-memory is the architectural model adopted by recent servers based on symmetric multiprocessors (SMP). It has been used by several parallel database system prototypes and products as it makes DBMS porting easy, using both inter-query and intra-query parallelism. Shared-memory has two advantages: simplicity and load balancing.
    Summary Shared memory systems form a major category of PDF. Tools. Request permission; Export citation; Add to favorites; Track (UMA), Non-uniform memory access (NUMA), Cache-only memory Architecture (COMA), Bus Based Symmetric Multiprocessors, Basic Cache Coherency Methods, Snooping Protocols, Directory Based Protocols, and
    1.1 Development of Distributed Shared Memory Distributed Shared Memory (DSM) is an architectural approach designed to overcome the scaling limitations of sym-metric shared-memory multiprocessors while retaining a shared memory model for communication and programming. DSM machines achieve this by using a memory that is physi-
    •Shared-memory – Architecture: chip has some number of cores (e.g., Intel Skylake has up to 18 cores depending on the model) with common memory – Application program is decomposed into a number of threads, which run on these cores; data structures are in common memory – Threads communicate by reading and writing memory locations
    Slow Memory Consistency − no global total order, no constraints across memory locations Each processor’s order respects its internal order and order of writes to same memory by same processor causal link that need not be respected P1 P2 causal link that must be respected A1 A2 A3 A3 A4 A1 A5 A2 A6 A1: W(X)1 A3: W(X)2 A3: W(Y)3 8
    architecture. 1.2 Bus-based Symmetric Multiprocessors Shared memory systems can be designed using bus-based or switch-based interconnection networks. The simplest network for shared memory systems is the bus. The bus/cache architecture facilitates the need for expensive multi-ported memories and interface circuitry as well as the need to adopt a
    Cache Coherence Protocols Cache Coherence Time Event Value of X in Cache-A Cache-B Memory 0 – – 1 1 CPU-A reads X 1 – 1 2 CPU-B reads X 1 1 1 3 CPU-A stores 0 in X 0 1 0 A memory system is coherent if: Write propagation: P1 writes to X; no other processor writes to X; sufficient
    Cache Coherence Protocols Cache Coherence Time Event Value of X in Cache-A Cache-B Memory 0 – – 1 1 CPU-A reads X 1 – 1 2 CPU-B reads X 1 1 1 3 CPU-A stores 0 in X 0 1 0 A memory system is coherent if: Write propagation: P1 writes to X; no other processor writes to X; sufficient

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