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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?
- Performance degradation due to contention (correct)
- Increased processing speed
- Improved cache coherence
- Enhanced synchronization
What typically addresses the contention problem in shared memory systems?
What typically addresses the contention problem in shared memory systems?
- Using caches (correct)
- Using multiple global memories
- Increasing the size of the shared memory
- Implementing complex data structures
What issue arises from having multiple copies of data in different caches?
What issue arises from having multiple copies of data in different caches?
- Cache memory overflow
- Cache coherence problems (correct)
- Improved data retrieval speed
- Data redundancy
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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