马斯克围观：传奇程序员John Carmack设想用200公里光纤代替内存

IT之家02-10

IT之家 2 月 10 日消息，传奇程序员约翰 · 卡马克（John Carmack）于 2 月 7 日在 X 平台发布推文，提出一项颠覆性构想：利用长达 200 公里的光纤线路替代传统的 DRAM，充当 AI 数据的二级缓存（L2 Cache）。IT之家查询公开资料，卡马克是全球最具影响力的程序员之一，被誉为“3D 游戏之父”和“FPS 游戏之父”，主导开发了《德军总部 3D》（...

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Carmack）于 2 月 7 日在 X 平台发布推文，提出一项颠覆性构想：利用长达 200 公里的光纤线路替代传统的 DRAM，充当 AI 数据的二级缓存（L2 Cache）。IT之家查询公开资料，卡马克是全球最具影响力的程序员之一，被誉为“3D 游戏之父”和“FPS 游戏之父”，主导开发了《德军总部 3D》（Wolfenstein 3D）、《毁灭战士》（Doom）和《雷神之锤》（Quake）。卡马克认为，在 AI 模型训练与推理过程中，为了追求极致的带宽和极低的延迟，传统的 DRAM（动态随机存取存储器）可能并非唯一解。他设想构建一个物理上长达 200 公里的光纤环路，利用光信号在纤维中传输的时间差来暂时“存储”数据。卡马克指出，目前的单模光纤技术已能在 200 公里的距离上实现 256 Tb/s 的传输速率。根据计算，在这个长度的光纤内部，任意时刻都有约 32GB 的数据处于“飞行传输”状态。这意味着，这根光纤本质上变成了一个拥有 32 TB/s 超高带宽、容量为 32GB 的存储器。这种“在传输中存储”的方式，特别适合处理具有确定性权重参考模式的神经网络数据。传奇程序员约翰 · 卡马克（John Carmack），图源：其个人 X 头图这一前卫设计让不少资深技术专家联想到了计算机发展初期的“延迟线存储器”（Delay-line memory）。计算机先驱们早在上世纪中叶，曾利用水银管或加金酒（Gin）混合液作为介质，通过声波的传播延迟来存储数据。卡马克的方案在原理上与其异曲同工，只是将介质换成了光纤，载体换成了光子。相比需要持续供电刷新才能保存数据的 DRAM，光传输的能耗极低，这在 AI 能耗日益庞大的今天具有巨大的理论吸引力。不过这项技术也面临巨大的技术挑战，尽管光传输节能，但铺设或盘绕 200 公里长的光纤本身成本极高，且配套的光放大器和数字信号处理器（DSP）也会消耗额外能源，可能抵消部分节能优势。埃隆 · 马斯克（Elon Musk）认同这个颠覆性构想，认为这是有趣的想法，使用高折射率材料，可以进一步减慢光速，增加每公里存储的数据量，甚至在讨论中提出了更为激进的“真空存储”设想，但这些目前更多停留在物理思维实验阶段。","kind":"news","is_publish_news":true,"is_publish_highlight":false,"is_publish_live":false,"is_publish_wemedia":null,"editions":null,"column":"","sentiment":"0","news_tag":"","news_rank":0,"isVideo":false,"video":null,"symbols":[],"gpt_button":1,"need_auth":false,"need_login_tip":false,"code":"91000000","status":"200"},"commentList":[],"isCommentEnd":true,"newsSizeData":{"likeSize":0,"commentSize":0,"repostSize":0,"favoriteSize":0,"likeStatus":false,"favoriteStatus":false},"APP":{"userAgent":"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; 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