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Journals ACM SIGARCH Computer Architecture News Volume 31 Issue 2

This work examines dynamic cluster assignment for a clustered trace cache processor (CTCP). Previously proposed cluster assignment techniques run into unique problems as issue width and cluster count increase. Realistic design conditions, such as variable data forwarding latencies between clusters and a heavily partitioned instruction window, increase the degree of difficulty for effective cluster assignment.In this work, the trace cache and fill unit are used to perform dynamic cluster assignment. The retire-time fill unit analysis is aided by a dynamic profiling mechanism embedded within the trace cache. This mechanism provides information about inter-trace data dependencies, an element absent in previous retire-time CTCP cluster assignment work. The strategy proposed in this work leads to more intra-cluster data forwarding and shorter data forwarding distances. In addition, performing cluster assignment at retire time reduces issue-time complexity and eliminates early pipeline stages. This increases overall performance for integer programs by 11.5% over our base CTCP architecture. This speedup is significantly higher than a previously proposed retire-time CTCP assignment strategy. Dynamic cluster assignment is also evaluated for several alternate cluster designs as well as for media benchmarks.

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Improving dynamic cluster assignment for clustered trace cache processors

Bhargava, Ravi; John, Lizy K.
ACM SIGARCH Computer Architecture News , Volume 31 (2)
Association for Computing Machinery – May 1, 2003

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