本文關(guān)鍵詞： 眾核處理器 片上網(wǎng)絡(luò)（NoC） 廣播 XY路由 子網(wǎng)劃分　出處：《上海交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：基于片上網(wǎng)絡(luò)（Networks-on-Chip，NoC）互連結(jié)構(gòu)的眾核處理器（Many-core）擁有數(shù)目眾多的計(jì)算資源，具有高性能并行處理能力，是未來微處理器體系結(jié)構(gòu)發(fā)展的趨勢(shì)。隨著核數(shù)的增加，如何有效利用大量處理器資源，提高系統(tǒng)吞吐率是眾核處理器體系結(jié)構(gòu)面臨的重要問題。同時(shí)，隨著處理器核的數(shù)量和片上網(wǎng)絡(luò)復(fù)雜度的增加，會(huì)產(chǎn)生Cache的“一致性墻”（Coherence Wall）問題，急劇增長(zhǎng)的Cache一致性代價(jià)限制了Cache性能的提升。 對(duì)局部若干處理單元進(jìn)行合并構(gòu)成虛擬計(jì)算群（Virtual ComputingGroup，VCG），能有效提高計(jì)算資源的利用率。面向片上網(wǎng)絡(luò)，采取子網(wǎng)劃分策略，子網(wǎng)劃分達(dá)到了子網(wǎng)間有效的通路隔離，有利于Cache一致性的正確實(shí)現(xiàn)，并使面向全網(wǎng)的Cache一致性限定在了子網(wǎng)內(nèi)，大大降低了Cache一致性帶來的代價(jià)。本文提出了邏輯子網(wǎng)（LogicSub-network）和物理子網(wǎng)（Physical Sub-network）的概念，邏輯子網(wǎng)保證了子網(wǎng)間有效的邏輯隔離，物理子網(wǎng)保證了子網(wǎng)內(nèi)通信路由的正確實(shí)現(xiàn)，相比較前人研究，，此方案能進(jìn)行任意子網(wǎng)劃分，大大提升了子網(wǎng)劃分的自由度。與此同時(shí)，對(duì)于一些特定的Cache一致性協(xié)議，其存在大量廣播通信特性，本文實(shí)現(xiàn)了一種基于樹形的XY路由廣播機(jī)制，能有效降低片上網(wǎng)絡(luò)內(nèi)廣播通信帶來的功耗、通信延遲開銷。 本課題基于Gem5多核仿真平臺(tái)，實(shí)現(xiàn)了一套基于子網(wǎng)劃分的XY路由廣播機(jī)制，實(shí)驗(yàn)結(jié)果表明，對(duì)比基于單播的廣播機(jī)制，片上網(wǎng)絡(luò)性能得到了極大改善。
[Abstract]:Many-core processor based on on-chip network network on-ChipNOC interconnection architecture has a large number of computing resources and high performance parallel processing capability, which is the development trend of microprocessor architecture in the future. How to effectively utilize a large number of processor resources and improve system throughput is an important problem facing the architecture of multi-core processors. At the same time, with the increase of the number of processor cores and the complexity of on-chip network, The consistency wall of Cache will arise, and the increasing consistency cost of Cache limits the improvement of Cache performance. The virtual computing group virtual computing group (VCGG) is formed by merging some local processing units, which can effectively improve the utilization rate of computing resources. In view of the on-chip network, the strategy of subnet partition is adopted, and the subnet partition achieves the effective path isolation between subnets. It is beneficial to the correct realization of Cache consistency, and makes the Cache consistency for the whole network limited to the subnet, which greatly reduces the cost of Cache consistency. In this paper, the concepts of logical Sub-Network and physical Sub-Network are proposed. Logical subnet ensures effective logical isolation between subnets, physical subnet ensures the correct realization of communication routing in subnet. Compared with previous studies, this scheme can be divided into arbitrary subnets. It greatly improves the degree of freedom of subnet partitioning. At the same time, for some specific Cache conformance protocols, there are a large number of broadcast communication characteristics. In this paper, a tree based XY routing broadcasting mechanism is implemented. It can effectively reduce the power consumption and the communication delay overhead caused by the on-chip broadcast communication. An XY routing broadcasting mechanism based on subnet partition is implemented based on Gem5 multi-core simulation platform. The experimental results show that compared with unicast broadcast mechanism, the performance of on-chip network is greatly improved.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TP368.1

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本文編號(hào)：1507350