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Questions and Answers
What is the primary concern when multiple processors access shared memory simultaneously?
What is the primary concern when multiple processors access shared memory simultaneously?
What typically addresses the contention problem in shared memory systems?
What typically addresses the contention problem in shared memory systems?
What issue arises from having multiple copies of data in different caches?
What issue arises from having multiple copies of data in different caches?
Under what condition are copies in caches considered coherent?
Under what condition are copies in caches considered coherent?
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What happens when one processor writes a value that changes a copy in the cache?
What happens when one processor writes a value that changes a copy in the cache?
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Study Notes
Shared Memory Systems
- Inter-processor communication and synchronization in shared memory systems occur through global memory access.
- Two main design challenges in shared memory systems:
- Performance degradation due to contention, when multiple processors attempt to access shared memory simultaneously.
- Coherence problems arising from multiple copies of data in caches.
- Caches are used to address contention issues.
- Coherence problems occur when cached copies of data become inconsistent due to updates by processors, leading to conflicting data values.
- The integrity of data in shared memory systems is maintained by ensuring the coherence of cached copies.
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Description
Test your understanding of shared memory systems, focusing on inter-processor communication, synchronization, and the challenges of performance degradation and coherence. This quiz explores concepts like cache usage and data integrity in a multi-processor environment.
