1. User-level Distributed Shared Memory
Wei Zhang & Shu Liu

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

3. 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

4. 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

5. Design Overview
2019/1/16
Progress Report

6. For a read
2019/1/16
Progress Report

7. For a write
2019/1/16
Progress Report

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

9. 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

10. 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