{"id":27114,"date":"2026-03-08T20:00:00","date_gmt":"2026-03-08T12:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=27114"},"modified":"2026-03-10T20:27:31","modified_gmt":"2026-03-10T12:27:31","slug":"nvlink-multi-gpu-bandwidth-distributed-training-explained","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/guides\/nvlink-multi-gpu-bandwidth-distributed-training-explained\/","title":{"rendered":"\u591a\u5361\u5e76\u884c(NVLink)\u6280\u672f\u8be6\u89e3\uff1a\u4e3a\u4ec0\u4e48 GPU \u8bad\u7ec3\u91cc 1+1 \u6709\u65f6\uff1e2\uff1f"},"content":{"rendered":"<p>\u8bb8\u591a\u6570\u636e\u79d1\u5b66\u5bb6\u548c AI \u5de5\u7a0b\u5e08\u5728\u7b2c\u4e00\u6b21\u642d\u5efa\u591a GPU \u8bad\u7ec3\u96c6\u7fa4\u65f6\uff0c\u90fd\u4f1a\u9677\u5165\u4e00\u4e2a\u76f4\u89c9\u4e0a\u7684\u201c\u7b97\u672f\u9677\u9631\u201d\uff1a\u4ee5\u4e3a\u4e24\u5f20\u5361\u7684\u901f\u5ea6\u7406\u5e94\u63a5\u8fd1\u5355\u5361\u7684\u4e24\u500d\u3002\u4f46\u6b8b\u9177\u7684\u73b0\u5b9e\u5f80\u5f80\u662f\uff0c\u82b1\u8d39\u91cd\u91d1\u52a0\u4e86\u7b2c\u4e8c\u5f20\u3001\u7b2c\u4e09\u5f20 GPU\uff0c\u8bad\u7ec3\u901f\u5ea6\u53ea\u8fce\u6765\u4e86\u5fae\u5f31\u7684\u63d0\u5347\uff0c\u6709\u65f6\u751a\u81f3\u6839\u672c\u4e0d\u7ebf\u6027\u3002<\/p>\n<p>\u95ee\u9898\u51fa\u5728\u54ea\u91cc\uff1f<\/p>\n<p>\u5982\u679c\u4f60\u68c0\u67e5\u4e86\u663e\u5b58\u3001\u786e\u8ba4\u4e86\u7b97\u529b\u8d1f\u8f7d\uff0c\u5374\u53d1\u73b0\u6269\u5c55\u6027\u4f9d\u7136\u62c9\u57ae\uff0c\u90a3\u4e48\u771f\u6b63\u7684\u201c\u6027\u80fd\u523a\u5ba2\u201d\u5f80\u5f80\u9690\u85cf\u5728 GPU \u4e0e GPU \u4e4b\u95f4\u7684\u6570\u636e\u4ea4\u6362\u901a\u9053\u4e2d\u3002\u4eca\u5929\uff0c\u6211\u4eec\u5c31\u901a\u8fc7\u6df1\u5ea6\u5bf9\u6bd4 PCIe \u4e0e NVLink \u6280\u672f\uff0c\u8bb2\u900f\u5206\u5e03\u5f0f\u8bad\u7ec3\u4e2d\u7684\u201c\u6728\u6876\u6548\u5e94\u201d\uff0c\u4ee5\u53ca\u4e3a\u4ec0\u4e48 <strong>\u201c\u4e92\u8054\u5e26\u5bbd\u201d\u65e9\u5df2\u6210\u4e3a\u73b0\u4ee3\u9ad8\u6027\u80fd\u7b97\u529b\u9009\u578b\u7684\u7b2c\u4e00\u51b3\u5b9a\u56e0\u7d20<\/strong>\u3002<\/p>\n<p><img decoding=\"async\" alt=\"\u4e3a\u4ec0\u4e48 1+1 \u6709\u65f6\uff1e2\uff1f\u591a\u5361\u5e76\u884c\u4e0e NVLink \u6280\u672f\u6df1\u5ea6\u89e3\u5bc6\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/03\/nvlink-multi-gpu-bandwidth-distributed-training-explained-repair-1.webp\" \/><\/p>\n<hr \/>\n<h2>\u4e00\u3001\u7b97\u529b\u95f2\u7f6e\u7684\u7f6a\u9b41\u7978\u9996\uff1a\u201c\u7b49\u6570\u636e\u201d<\/h2>\n<p>\u5355\u5361\u8bad\u7ec3\u65f6\uff0c\u4f60\u5173\u5fc3\u7684\u53ea\u6709\u4e00\u4ef6\u4e8b\u2014\u2014GPU \u7684\u6d6e\u70b9\u8fd0\u7b97\u80fd\u529b\uff08TFLOPS\uff09\u3002\u4f46\u5728\u591a\u5361\u5206\u5e03\u5f0f\u8bad\u7ec3\uff08\u5c24\u5176\u662f\u6570\u636e\u5e76\u884c\u4e0e\u5f20\u91cf\u5e76\u884c\uff09\u4e2d\uff0c\u6bcf\u4e00\u5c42\u7684\u53cd\u5411\u4f20\u64ad\u7ed3\u675f\u65f6\uff0c\u6240\u6709 GPU \u5fc5\u987b\u540c\u6b65\u5b83\u4eec\u7684\u68af\u5ea6\u4fe1\u606f\u5e76\u8fdb\u884c\u805a\u5408\u6c42\u5bfc\u3002<\/p>\n<p>\u8fd9\u5c31\u4ea7\u751f\u4e86\u4e00\u4e2a\u5c34\u5c2c\u7684\u8282\u594f\u5faa\u73af\uff1a<strong>\u8ba1\u7b97 -> \u901a\u4fe1\u7b49\u5f85 -> \u805a\u5408 -> \u4e0b\u4e00\u8f6e\u8ba1\u7b97\u3002<\/strong><\/p>\n<p>\u7531\u4e8e\u5927\u8bed\u8a00\u6a21\u578b\uff08LLM\uff09\u53c2\u6570\u52a8\u8f84\u6570\u767e\u4ebf\u8d77\u6b65\uff0c\u8fd9\u4e2a\u201c\u901a\u4fe1\u7b49\u5f85\u201d\u9636\u6bb5\u9700\u8981\u77ac\u95f4\u5728 GPU \u4e4b\u95f4\u4f20\u8f93\u767e GB \u7ea7\u522b\u7684\u6570\u636e\u56e2\u3002\u5982\u679c\u4f60\u7684\u4f20\u8f93\u901a\u9053\u4e0d\u591f\u5bbd\uff0c\u8fd0\u7b97\u529b\u518d\u6050\u6016\u7684 GPU \u4e5f\u5f97\u4e56\u4e56\u6392\u961f\uff0c\u8fdb\u5165\u201c\u7b97\u529b\u95f2\u7f6e\u671f\u201d\uff08Idle Time\uff09\u3002\u591a\u5361\u7b97\u529b\u65e0\u6cd5\u7ebf\u6027\u53e0\u52a0\u7684\u672c\u8d28\uff0c\u6b63\u662f\u56e0\u4e3a\uff1a<strong>\u4f60\u5176\u5b9e\u4e0d\u5728\u7b49\u7b97\u529b\uff0c\u4f60\u5728\u7b49\u540c\u6b65\u3002<\/strong><\/p>\n<hr \/>\n<h2>\u4e8c\u3001PCIe vs NVLink\uff1a\u4ece\u201c\u56fd\u9053\u201d\u5230\u201c\u8d85\u9ad8\u901f\u4e13\u7ebf\u201d<\/h2>\n<p>\u4e3a\u4e86\u89e3\u51b3 GPU \u4e4b\u95f4\u7684\u6570\u636e\u4e92\u901a\uff0c\u76ee\u524d\u670d\u52a1\u5668\u4e3b\u677f\u4e0a\u6709\u4e24\u6761\u622a\u7136\u4e0d\u540c\u7684\u7f51\u7edc\u62d3\u6251\u3002<\/p>\n<h3>2.1 PCIe \u7684\u74f6\u9888\u5c40\u9650<\/h3>\n<p>PCIe\uff08PCI Express\uff09\u662f\u670d\u52a1\u5668\u7684\u6807\u51c6\u603b\u7ebf\uff0c\u6781\u5176\u901a\u7528\u3002\u4f46\u5728\u6781\u91cd\u7684 AI \u8bad\u7ec3\u96c6\u7fa4\u4e2d\uff0c\u5b83\u662f\u5178\u578b\u7684\u201c\u56fd\u9053\u201d\u3002<\/p>\n<ul>\n<li><strong>\u5e26\u5bbd\u6781\u4f4e<\/strong>\uff1a\u54ea\u6015\u662f\u4e3b\u6d41\u7684 PCIe Gen 4 x16\uff0c\u5176\u53cc\u5411\u7406\u8bba\u6781\u9650\u4e5f\u4e0d\u8fc7\u52c9\u5f3a 64GB\/s\u3002<\/li>\n<li><strong>\u7ed3\u6784\u7ed5\u8def<\/strong>\uff1a\u901a\u8fc7 PCIe \u4e92\u8054\u7684\u4e24\u5f20 GPU\uff0c\u6570\u636e\u5fc5\u987b\u5148\u7a7f\u8fc7\u4e3b\u677f\u7684 PCIe Switch \u751a\u81f3\u7ed5\u884c CPU\uff0c\u4e0d\u4ec5\u62e5\u5835\uff0c\u8fd8\u589e\u52a0\u4e86\u9ad8\u6602\u7684\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<h3>2.2 NVLink \u7684\u66b4\u529b\u78be\u538b<\/h3>\n<p>NVLink \u662f NVIDIA \u4e13\u6709\u7684\u76f4\u63a5\u70b9\u5bf9\u70b9\uff08P2P\uff09\u9ad8\u80fd\u6548\u4e92\u8054\u6280\u672f\u3002\u5b83\u7684\u8bbe\u8ba1\u54f2\u5b66\u975e\u5e38\u7b80\u5355\u7c97\u66b4\u2014\u2014\u7528\u6781\u5bbd\u7684\u4e13\u7528\u7269\u7406\u901a\u9053\uff0c\u628a\u591a\u5f20 GPU \u710a\u63a5\u6210\u4e00\u5f20\u201c\u8d85\u7ea7\u5de8\u65e0\u9738\u201d GPU\u3002<\/p>\n<p><img decoding=\"async\" alt=\"GPU\u4e92\u8054\u53cc\u5411\u5e26\u5bbd\u6781\u503c\u5bf9\u6bd4\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/03\/nvlink-multi-gpu-bandwidth-distributed-training-explained-2.webp\" \/><\/p>\n<p>\u5982\u6570\u636e\u6240\u793a\uff0c\u4e00\u5f20 A100 GPU \u4e0a\u7684\u7b2c\u4e09\u4ee3 NVLink \u53ef\u4ee5\u63d0\u4f9b\u60ca\u4eba\u7684 <strong>600 GB\/s<\/strong> \u6781\u5bbd\u4e92\u8054\uff0c\u5230\u4e86 H100 \u7684\u7b2c\u56db\u4ee3\u66f4\u662f\u72c2\u98d9\u81f3 <strong>900 GB\/s<\/strong>\u3002\u76f8\u8f83\u4e8e PCIe \u7684 64GB\/s\uff0cNVLink \u8db3\u8db3\u62d3\u5bbd\u4e86 10~14 \u500d\uff01\u6570\u636e\u5305\u518d\u4e5f\u4e0d\u7528\u7ed5\u8def CPU\uff0c\u800c\u662f\u901a\u8fc7\u539f\u751f\u6865\u63a5\u7684\u9ad8\u901f\u516c\u8def\u76f4\u63a5\u503e\u6cfb\u5230\u76f8\u90bb\u7684\u8ba1\u7b97\u5361\u4e2d\u3002<\/p>\n<hr \/>\n<h2>\u4e09\u3001\u4e3a\u4ec0\u4e48\u6709\u65f6 &#8220;1+1 \uff1e 2&#8243;\uff1f<\/h2>\n<p>\u4e3a\u4ec0\u4e48\u6709\u4e9b\u67b6\u6784\u5e08\u5ba3\u79f0\uff0c\u5728\u67d0\u4e9b\u6781\u7aef\u573a\u666f\u4e0b\uff0c\u53cc\u53d1 NVLink \u9635\u5217\u7684\u6548\u7387\u751a\u81f3\u8d85\u8fc7\u4e86\u4e24\u5f20\u5b64\u7acb\u5355\u5361\u7b97\u529b\u7684\u603b\u548c\uff1f\u8fd9\u91cc\u6709\u4e24\u5c42\u6df1\u610f\uff1a<\/p>\n<ol>\n<li><strong>\u7a81\u7834\u663e\u5b58\u5899\u7684\u9b54\u6cd5<\/strong>\uff1a\u5f53\u5e9e\u5927\u7684\u6a21\u578b\u53c2\u6570\uff08\u54ea\u6015\u5f00\u542f\u4e86\u91cf\u5316\uff09\u5927\u5230\u5355\u5361\u65e0\u6cd5\u88c5\u4e0b\u65f6\uff0c\u5355\u5361\u6839\u672c\u8dd1\u90fd\u8dd1\u4e0d\u8d77\u6765\uff08OOM\uff09\u3002\u800c\u901a\u8fc7 NVLink \u6df1\u5ea6\u6c60\u5316\u7684\u591a\u5361\uff0c\u76f8\u5f53\u4e8e\u62e5\u6709\u4e86\u4e00\u5757\u6ca1\u6709\u5206\u5272\u635f\u8017\u7684\u8d85\u5927\u663e\u5b58\u6c60\uff0c\u8ba9\u539f\u672c\u65e0\u6cd5\u8fd0\u884c\u7684\u8d85\u5927\u6a21\u578b\u987a\u5229\u8d77\u98de\uff0c\u8fd9\u5c31\u662f 0 \u5230 1 \u7684\u8d28\u53d8\u3002<\/li>\n<li><strong>\u8de8\u5361\u805a\u5408\u7684\u9ad8\u9636\u91cd\u53e0<\/strong>\uff1a\u51ed\u501f NVLink \u7684\u6050\u6016\u541e\u5410\u91cf\u4ee5\u53ca NVSwitch \u6784\u5efa\u7684\u5168\u4e92\u8054\u62d3\u6251\uff0c\u5f00\u53d1\u8005\u53ef\u4ee5\u8f7b\u6613\u5b9e\u73b0 <code>Compute-Communication Overlap<\/code>\uff08\u8ba1\u7b97\u4e0e\u901a\u4fe1\u91cd\u53e0\uff09\u3002\u5f53\u5f20\u5361\u5728\u8ba1\u7b97\u7b2c N \u5c42\u68af\u5ea6\u65f6\uff0c\u5e95\u5c42\u786c\u4ef6\u5df2\u7ecf\u5728\u5168\u901f\u540c\u6b65\u7b2c N-1 \u5c42\u7684\u68af\u5ea6\uff0c\u7b97\u529b\u5229\u7528\u7387\uff08MFU\uff09\u903c\u8fd1\u6781\u503c\uff01<\/li>\n<\/ol>\n<hr \/>\n<h2>\u56db\u3001Hostease \u5efa\u8bae\uff1aGPU \u88f8\u673a\u7684\u6b63\u786e\u9009\u8d2d\u59ff\u52bf<\/h2>\n<p>\u73b0\u5728\uff0c\u5f53\u4f60\u5728\u5e02\u573a\u4e0a\u9009\u914d GPU \u670d\u52a1\u5668\u6765\u8fdb\u884c\u5927\u6a21\u578b\u9884\u8bad\u7ec3\u3001\u6216\u662f\u5e76\u884c\u5f3a\u5316\u5b66\u4e60\u65f6\uff0c\u5343\u4e07\u4e0d\u8981\u53ea\u76ef\u7740\u201c\u5b83\u63d2\u4e86\u591a\u5c11\u5f20 RTX 4090\u201d\u770b\u3002<\/p>\n<h3>\u7b97\u529b\u907f\u5751\u6307\u5357\uff1a<\/h3>\n<ul>\n<li><strong>\u6d88\u8d39\u7ea7\u6e38\u620f\u5361\u65e0\u7f18 NVLink<\/strong>\uff1a\u5982\u4eca\u5e02\u9762\u4e0a\u7684\u6d88\u8d39\u7ea7\u663e\u5361\uff08\u5982 RTX 4090\u30013090\/Ti \u7b49\u7ec4\u5408\uff09\u5df2\u88ab NVIDIA \u5f3a\u5236\u9609\u5272\u4e86 NVLink \u529f\u80fd\u5e76\u7981\u6b62\u7528\u4e8e\u4e91\u6570\u636e\u4e2d\u5fc3\u7684\u9ad8\u5f3a\u5ea6\u5e76\u884c\u3002\u5982\u679c\u670d\u52a1\u5546\u5411\u4f60\u63a8\u9500\u51e0\u5341\u5f20 4090 \u642d\u6210\u7684\u201c\u8d85\u5ec9\u4ef7 AI \u670d\u52a1\u5668\u201d\uff0c\u52a1\u5fc5\u5f53\u5fc3\u3002\u5b83\u4eec\u53ea\u80fd\u8d70 PCIe\uff0c\u5728\u8bad\u7ec3\u5927\u6a21\u578b\u65f6\u5fc5\u5c06\u906d\u9047\u4e25\u91cd\u7684\u901a\u4fe1\u5835\u585e\u3002<\/li>\n<li><strong>\u4f01\u4e1a\u7ea7\u7684\u201c\u771f\u00b7\u901a\u4fe1\u201d<\/strong>\uff1a\u771f\u6b63\u7528\u4e8e\u5e76\u884c\u751f\u4ea7\u73af\u5883\u7684\u5e94\u5f53\u662f A100\u3001H100 \u6216\u4f01\u4e1a\u7ea7 L\/V \u7cfb\u5217\u7b49\u539f\u751f\u642d\u8f7d\u9ad8\u7248\u672c NVLink \u4e0e NVSwitch \u7684\u6570\u636e\u4e2d\u5fc3\u5361\u3002<\/li>\n<\/ul>\n<p>\u6784\u5efa\u7a33\u56fa\u7684\u5927\u578b\u7b97\u529b\u96c6\u7fa4\uff0c\u4e0d\u4ec5\u9700\u8981\u7b97\u529b\u5361\uff0c\u66f4\u9700\u8981\u914d\u5957\u7684\u8d85\u5bbd\u4e3b\u677f\u80cc\u677f\u4e0e\u4f01\u4e1a\u7ea7\u7f51\u7edc\u3002<strong><a href=\"https:\/\/cn.hostease.com\/dedicated-servers.html\">Hostease \u63d0\u4f9b\u7684\u88f8\u91d1\u5c5e\u72ec\u7acb\u670d\u52a1\u5668\u7cfb\u5217<\/a><\/strong>\u652f\u6301\u6309\u9700\u5b9a\u5236\uff0c\u63d0\u4f9b\u5145\u6c9b\u7684\u7269\u7406\u673a\u80fd\u4e0e\u5e72\u51c0\u7684\u72ec\u4eab\u7f51\u7edc\u73af\u5883\u3002\u62d2\u7edd\u201c\u7b97\u529b\u9a97\u5c40\u201d\uff0c\u5c06\u6bcf\u4e00\u5206\u94b1\u7684\u7b97\u529b\u6295\u8d44\u90fd\u5b9e\u6253\u5b9e\u5730\u8f6c\u5316\u4e3a\u6781\u81f4\u7684\u8bad\u7ec3\u901f\u5ea6\uff0c\u624d\u662f\u73b0\u4ee3 AI 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