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• W91600894 abstract "Distributed shared memory (DSM) systems simplify the task of writing distributed-memory parallel programs by automating data distribution and communication. Unfortunately, DSM systems control memory and communication using fixed policies, even when programmers or compilers could manage these resources more efficiently.This thesis proposes a new approach that lets users efficiently manage communication and memory on DSM systems. Systems provide primitive DSM mechanisms without binding them to fixed protocols (policies). Standard shared-memory programs use default protocols similar to those found in current DSM machines. Unlike current systems, these protocols are implemented in unprivileged software. Programmers and compilers are free to modify or replace them with optimized custom protocols that manage memory and communication directly and efficiently.To explore this new approach, this thesis: (1) identifies a set of mechanisms for distributed shared memory, (2) develops Tempest, a portable programming interface for mechanism-based DSM systems, (3) describes Stache, a protocol that uses Tempest to implement a standard shared-memory model, (4) summarizes custom protocols developed for six shared-memory applications, (5) designs and simulates three systems--Typhoon, Typhoon-1, and Typhoon-0--that support Tempest, and (6) describes a working hardware prototype of Typhoon-0, the simplest of those designs.Tempest combines fine-grain coherence support, an active message model, and virtual-memory-based page allocation to provide portability across a range of platforms.Typhoon, Typhoon-1, and Typhoon-0 support Tempest using different levels of custom hardware integration. Typhoon achieves high performance by integrating key components on one device. Typhoon-1 and Typhoon-0 use off-the-shelf parts for some of these components, trading some performance for simpler designs.Typhoon demonstrates that mechanism-based DSM systems can compete with hard-wired-protocol systems on unmodified shared-memory applications (within 25% across six benchmarks). Despite Typhoon's low overheads, custom protocols improve performance significantly for some applications--by 384% for one benchmark. Results for Typhoon-1 and Typhoon-0 on unmodified applications are varied, but custom protocols bring them within 13% and 47% of Typhoon, respectively.A working Typhoon-0 prototype demonstrates the feasibility of these designs. Measurements of the prototype's performance substantiate simulator projections." @default.
• W91600894 created "2016-06-24" @default.
• W91600894 creator A5043998497 @default.
• W91600894 creator A5075888890 @default.
• W91600894 date "1996-01-01" @default.
• W91600894 modified "2023-09-23" @default.
• W91600894 title "Mechanisms for distributed shared memory" @default.
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