IC695ALG628
05DPU如何變革下一代計算基礎設施
DPU是 Data Processing Unit的簡稱。
DPU將作為CPU的卸載引擎，釋放CPU的算力到上層應用。以網絡協議處理為例，要線速處理10G的網絡需要的大約4個Xeon CPU的核，也就是說，單是做網絡數據包處理，就可以占去一個8核高端CPU的一半的算力。如果考慮40G、100G的高速網絡，性能的開銷就更加難以承受了。Amazon把這些開銷都稱之為“Datacenter Tax”——還未運行業務程序，先接入網絡數據就要占去的計算資源。AWS Nitro產品家族旨在將數據中心開銷（為虛機提供遠程資源，加密解密，故障跟蹤，安全策略等服務程序）全部從CPU卸載到Nitro加速卡上，將給上層應用釋放30%的原本用于支付“Tax” 的算力！
DPU將成為新的數據網關，將安全隱私提升到一個新的高度。在網絡環境下，網絡接口是理想的隱私的邊界，但是加密、解密的算法開銷都很大，例如國密標準的非對稱加密算法SM2、哈希算法SM3和對稱分組密碼算法SM4。如果用CPU來處理，就只能做少部分數據量的加密。在未來，隨著區塊鏈承載的業務的逐漸成熟，運行共識算法POW，驗簽等也會消耗掉大量的CPU算力。而這些都可以通過將其固化在DPU中來實現，甚至DPU將成為一個可信根。
DPU將成為存儲的入口，將分布式的存儲和遠程訪問本地化。隨著SSD性價比逐漸變得可接受，部分存儲遷移到SSD器件上已經成為可能，傳統的面向機械硬盤的SATA協議并不適用于SSD存儲，所以，將SSD通過本地PCIE或高速網絡接入系統就成為必選的技術路線。NVMe（Non Volatile Memory Express）就是用于接入SSD存儲的高速接口標準協議，可以通過PCIe作為底層傳輸協議，將SSD的帶寬優勢充分發揮出來。同時，在分布式系統中，還可通過NVMe over Fabric協議擴展到InfiniBand、或TCP互連的節點中，實現存儲的共享和遠程訪問。這些新的協議處理都可以集成在DPU中來實現對CPU的透明處理。進而，DPU將可能承接各種互連協議控制器的角色，在靈活性和性能方面達到一個更優的平衡點。
DPU將成為算法加速的沙盒，成為最靈活的加速器載體。DPU不完全是一顆固化的ASIC，在CXL, CCIX等標準組織所倡導CPU、GPU與DPU等數據一致性訪問協議的鋪墊下，將更進一步掃清DPU編程障礙，結合FPGA等可編程器件，可定制硬件將有更大的發揮空間，“軟件硬件化”將成為常態，異構計算的潛能將因各種DPU的普及而徹底發揮出來。在出現“Killer Application”的領域都有可能出現與之相對應的DPU，諸如傳統數據庫應用如OLAP、OLTP， 或新興應用如智能駕駛等。
IC695ALG628
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