Computer-Organization
October 5, 2023Computer-Organization
October 5, 2023Computer-Organization
| Question 294 |
For a multiprocessor architecture, In which protocol a write transaction is forwarded to only those processors that are known to possess a copy of newly altered cache line ?
| Snoopy bus protocol | |
| Cache coherence protocol | |
| Directory-based protocol | |
| None of the above |
Question 294 Explanation:
→ Directory based coherence is a mechanism to handle Cache coherence problem in Distributed shared memory (DSM).
→ Non-Uniform Memory Access (NUMA). Another popular way is to use a special type of computer bus between all the nodes as a “shared bus” (System bus).
→ Directory-based coherence uses a special directory to serve instead of the shared bus in the bus based coherence protocols.
→ In directory-based cache coherence, this is done by using this directory to keep track of the status of all cache blocks, the status of each block includes in which cache coherence “state” that block is, and which nodes are sharing that block at that time, which can be used to eliminate the need to broadcast all the signals to all nodes, and only send it to the nodes that are interested in this single block.
→ Non-Uniform Memory Access (NUMA). Another popular way is to use a special type of computer bus between all the nodes as a “shared bus” (System bus).
→ Directory-based coherence uses a special directory to serve instead of the shared bus in the bus based coherence protocols.
→ In directory-based cache coherence, this is done by using this directory to keep track of the status of all cache blocks, the status of each block includes in which cache coherence “state” that block is, and which nodes are sharing that block at that time, which can be used to eliminate the need to broadcast all the signals to all nodes, and only send it to the nodes that are interested in this single block.
Correct Answer: C
Question 294 Explanation:
→ Directory based coherence is a mechanism to handle Cache coherence problem in Distributed shared memory (DSM).
→ Non-Uniform Memory Access (NUMA). Another popular way is to use a special type of computer bus between all the nodes as a “shared bus” (System bus).
→ Directory-based coherence uses a special directory to serve instead of the shared bus in the bus based coherence protocols.
→ In directory-based cache coherence, this is done by using this directory to keep track of the status of all cache blocks, the status of each block includes in which cache coherence “state” that block is, and which nodes are sharing that block at that time, which can be used to eliminate the need to broadcast all the signals to all nodes, and only send it to the nodes that are interested in this single block.
→ Non-Uniform Memory Access (NUMA). Another popular way is to use a special type of computer bus between all the nodes as a “shared bus” (System bus).
→ Directory-based coherence uses a special directory to serve instead of the shared bus in the bus based coherence protocols.
→ In directory-based cache coherence, this is done by using this directory to keep track of the status of all cache blocks, the status of each block includes in which cache coherence “state” that block is, and which nodes are sharing that block at that time, which can be used to eliminate the need to broadcast all the signals to all nodes, and only send it to the nodes that are interested in this single block.
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