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RISC-V,靠AI崛起

RISC-V,靠AI崛起

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赛昉科技(SiFive)新近宣布完成 4 亿美元 G 轮融资,这标志着面向自主智能体 AI 数据中心场景的高性能 RISC-V 处理器开发,迎来了重要的技术拐点。本轮融资后公司估值达 36.5 亿美元,资金将专门用于加速下一代 CPU 知识产权核(IP)研发、软件生态成熟化以及超大规模部署落地。上述举措共同应对新兴算力瓶颈 —— 在日益异构化的 AI 基础设施中,传统架构难以在调度效率、扩展性与功耗限制之间取得平衡。

这笔投资背后的核心技术驱动力,是 CPU 在自主智能体 AI 系统中日益重要的地位。尽管 GPU 与专用加速器能为张量运算提供高吞吐率,但它们并未针对复杂控制流、任务调度与系统级协同进行优化。由多个交互推理循环、工具调用模块与动态决策树构成的智能体模型,需要低延迟调度与高效上下文切换。而具备可扩展指令集与可扩展向量运算能力的 CPU,尤其适合处理这类负载。RISC-V 的模块化架构允许厂商针对特定调度模式定制标量、向量与矩阵扩展指令,相比整体式的传统指令集架构能效更优。

从微架构角度看,其技术路线图重点在于将标量流水线与向量、矩阵计算单元深度耦合。这种协同设计通过减少异构计算模块间的数据搬运,降低内存带宽开销。将领域专用加速器直接集成到 CPU 结构中,可让 RISC-V 处理器高效运行混合负载 —— 即控制密集型逻辑与本地数值计算交替执行的场景。这对执行推理、规划与迭代优化任务的 AI 智能体尤为关键,这类任务需要频繁在符号运算与数值运算间切换。这种集成设计还能简化缓存一致性,降低因使用独立加速器带来的延迟损耗。

功耗效率是另一大核心技术考量。随着 AI 集群规模扩大,机房总功耗与热密度逐渐成为瓶颈。传统架构常依靠高主频与深度乱序执行流水线提升性能,导致能耗大幅上升。而 RISC-V 架构可通过面向特定负载的指令扩展与适度规模的流水线设计,实现更优的每瓦性能。这让数据中心运营商能在现有功耗预算内扩充算力,在 AI 训练与推理需求呈指数级增长的背景下至关重要。

融资投向的软件生态建设同样意义重大。扩大对主流操作系统与加速框架的支持,可确保新硬件无需大量移植工作即可部署。对 Linux 发行版与 GPU 互联技术的原生兼容,能够构建由 RISC-V CPU 统一调度 GPU 加速算力的异构集群。这种紧密耦合可提升调度效率、缓解主机侧瓶颈。此外,针对向量与矩阵扩展的标准化工具链与编译器优化,是充分释放硬件性能的必要条件。对软件基础设施的投入将加速超大规模厂商与企业用户的落地应用。

面向客户的支持举措也凸显出架构层面更广泛的协同设计趋势。超大规模云厂商越来越需要定制化 CPU IP 以打造差异化基础设施。与固定架构不同,RISC-V 支持集成私有加速器、专用存储层级与定制化互联逻辑。这种灵活性缩短设计周期,可根据不断演进的 AI 负载快速迭代。随着自主智能体 AI 系统日趋复杂,对 CPU 特性进行定制 —— 如硬件任务调度器、低延迟消息原语或领域专用向量单元 —— 将具备重要战略价值。

另一技术优势在于生态的开放性。开放标准促进芯片厂商、云服务商与软件开发者之间的协作。这种协作模式允许各方独立参与指令集扩展、验证框架与性能优化工具的开发,从而加速创新。长期来看,有望形成比肩成熟架构的强健生态,同时保留专业化定制的灵活性。

总结而言,本轮融资支撑三大相互关联的技术目标:推进高性能 RISC-V CPU IP 研发、拓展软件兼容性,以及实现其在 AI 数据中心的规模化部署。这些举措共同解决自主智能体 AI 负载带来的调度、能效与扩展性挑战。随着算力基础设施向异构化、功耗受限方向演进,集成向量与矩阵运算能力的可定制 CPU 架构,将在下一代 AI 系统中占据核心地位。

(来源:Semiwiki

*免责声明:本文由作者原创。文章内容系作者个人观点,半导体行业观察转载仅为了传达一种不同的观点,不代表半导体行业观察对该观点赞同或支持,如果有任何异议,欢迎联系半导体行业观察。

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  1. CONNECT:[ UseTime:0.000410s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000577s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000256s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000598s ]
  6. SELECT * FROM `set` [ RunTime:0.000241s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 512930 LIMIT 1 [ RunTime:0.000391s ]
  9. UPDATE `article` SET `lasttime` = 1775953916 WHERE `id` = 512930 [ RunTime:0.003319s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000262s ]
  11. SELECT * FROM `article` WHERE `id` < 512930 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000443s ]
  12. SELECT * FROM `article` WHERE `id` > 512930 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000389s ]
  13. SELECT * FROM `article` WHERE `id` < 512930 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001127s ]
  14. SELECT * FROM `article` WHERE `id` < 512930 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000783s ]
  15. SELECT * FROM `article` WHERE `id` < 512930 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000743s ]
0.104382s