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L 2 to Off-Chip Memory Interconnects for CMPs
| Content Provider | Semantic Scholar |
|---|---|
| Author | Killebrew, Daniel |
| Copyright Year | 2008 |
| Abstract | In recent years, chip multiprocessors (CMPs) have seen an increasing asymmetry between the number of cores and the number of memory access points on a single die, prompting a new study of network topologies that efficiently connect many nodes to few nodes. In this paper, we evaluate the latency and power efficiency of the tapered-fat tree (TFT) topology on a cycle-accurate simulator intended to model the TILE64 multiprocessor. We replace the original mesh network with two TFT networks (one for memory requests, one for memory responses) and run four synthetic benchmarks modeled after those in the PARSEC suite. Because several connections in the TFT network require global wires, we also modeled the multi-cycle latencies using a wire-delay model. Our simulator keeps track of activity factors in each of the routers, which we combine with the Orion power models to determine the switching power of the routers. We determined that for applications with large amounts of sharing and little off-chip traffic, the TFT topology offers negligible advantage over the mesh. However, the benchmarks that exhibited large amounts of off-chip traffic completed a workload up to 33.6% faster on the TFT than the same workload on the mesh. The TFT topology also has better power-efficiency in all cases except canneal, which dissipates a large amount of power in the inter-router interconnect due to the high volume of stores. Although this benchmark dissipated more average power on the TFT, the total energy consumed is less than on the mesh because it completed faster. At the cost of extra design complexity, our results suggest that the TFT topology offers better latency and energy-efficiency overall than the mesh for memory-intensive applications running on multicore processors. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://people.eecs.berkeley.edu/~kubitron/courses/cs258-S08/projects/reports/project2_report.pdf |
| Alternate Webpage(s) | http://www.cs.berkeley.edu/~kubitron/courses/cs258-S08/projects/reports/project2_report.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
