User-level Distributed Shared Memory Wei Zhang & Shu Liu

DSM: Shared Memory + Distributed Memory 2019/1/16 Progress Report

Problems & Solutions Problems Solutions Granularity Use 4-Kbyte Page as the unit of sharing Data location/Mapping Centralized server Communication MPI (Message Passing Interface) 2019/1/16 Progress Report

Cont. Problems Solutions Memory Coherence in parallelism a: each page has one dynamic owner b: multi readers (make copies) c: single writer (only owner can write the page) d: lock (synchronize page operation) 2019/1/16 Progress Report

Design Overview 2019/1/16 Progress Report

For a read 2019/1/16 Progress Report

For a write 2019/1/16 Progress Report

Initial results User Level Virtual memory 2019/1/16 Progress Report

Cont. Memory Mapping and Page fault generation (same with VM) Main DSM Data structure pageinfo on server page table on nodes Communication Functions network needs more time than disk time of sending a page is more or the less than send a byte Part of Memory Coherence Model Algorithm 2019/1/16 Progress Report

Following Steps Finish coding (mostly coherence model ) Evaluation Benchmarks (good and bad results) Analyze the results Good performance Poor performance 2019/1/16 Progress Report