{"id":95025,"date":"2026-08-16T00:25:04","date_gmt":"2026-08-15T16:25:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/95025.html"},"modified":"2026-08-16T00:25:04","modified_gmt":"2026-08-15T16:25:04","slug":"nvlink-%e8%b7%a8%e5%8d%a1%e5%90%8c%e6%ad%a5%e9%9a%90%e8%97%8f%e7%ae%97%e5%ad%90%ef%bc%88%e5%a4%9a%e5%8d%a1-h200-%e5%88%86%e5%b8%83%e5%bc%8f%e4%b8%93%e5%b1%9e%ef%bc%8crtx-%e6%97%a0-nvlink%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/95025.html","title":{"rendered":"NVLink \u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\uff08\u591a\u5361 H200 \u5206\u5e03\u5f0f\u4e13\u5c5e\uff0cRTX \u65e0 NVLink\uff09"},"content":{"rendered":"<li>\n<p>\u524d\u8a00\u5206\u5e03\u5f0f\u5927\u6a21\u578b\u8bad\u7ec3\u591a\u5361\u68af\u5ea6\u540c\u6b65\u3001\u5f20\u91cf\u5e7f\u64ad\u3001allreduce \u5ef6\u8fdf\u5c45\u9ad8\u4e0d\u4e0b&#xff0c;\u5f88\u591a\u4eba\u4ec5\u5f52\u548e\u4e8e NVLink \u5e26\u5bbd\u4e0d\u8db3&#xff0c;\u5ffd\u7565 GPU \u786c\u4ef6\u5185\u7f6e\u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\u5e26\u6765\u7684\u6d41\u6c34\u7ebf\u4e2d\u65ad\u635f\u8017\u3002NVLink \u94fe\u8def\u5b58\u5728\u72ec\u7acb\u786c\u4ef6\u540c\u6b65\u7b97\u5b50&#xff0c;\u8d1f\u8d23\u5361\u95f4\u5f20\u91cf\u5206\u53d1\u3001\u68af\u5ea6\u5f52\u7ea6\u3001\u5c4f\u969c\u540c\u6b65&#xff0c;\u7b97\u5b50\u4f1a\u6253\u65ad\u5355\u5361 TC\/HBM \u6d41\u6c34\u7ebf&#xff0c;\u4ea7\u751f\u8de8\u5361\u6c14\u6ce1\u3002<br \/>\n\u5355\u673a MPS\u3001HBM \u8c03\u5ea6\u4ec5\u5355\u5361\u8d44\u6e90\u4e89\u62a2&#xff0c;\u591a\u5361\u53e0\u52a0 NVLink \u540c\u6b65\u7b97\u5b50\u635f\u8017\u540e&#xff0c;\u6574\u4f53\u7b97\u529b\u635f\u5931\u9ad8\u4e8e\u5355\u673a\u6d4b\u7b97 14%~20%&#xff1b;\u672c\u6587\u63a8\u6f14 NVLink \u5e95\u5c42 allreduce\u3001barrier \u5c4f\u969c\u4e24\u7c7b\u9690\u85cf\u7b97\u5b50&#xff0c;\u91cf\u5316\u8de8\u5361\u540c\u6b65\u7b97\u529b\u8870\u51cf&#xff0c;\u914d\u5957\u4eff\u771f\u4ee3\u7801\u3001\u96c6\u7fa4\u8e29\u5751\u3001\u5206\u5e03\u5f0f\u8fb9\u754c&#xff0c;\u8865\u5168\u591a\u5361\u8d1f\u8f7d\u63a8\u6f14\u4f53\u7cfb\u30022. \u7b80\u4ecb\u63a8\u6f14 Hopper NVLink4 \u786c\u4ef6\u5185\u7f6e\u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50&#xff08;allreduce \u5f52\u7ea6\u3001\u5168\u5c40 barrier \u5c4f\u969c&#xff09;&#xff1b;\u62c6\u89e3\u8de8\u5361\u5f20\u91cf\u62f7\u8d1d\u3001\u540c\u6b65\u6d41\u6c34\u7ebf\u4e2d\u65ad\u3001\u94fe\u8def\u4e89\u62a2\u4e09\u5c42\u635f\u8017&#xff1b;\u7ed9\u51fa\u8de8\u5361\u540c\u6b65\u7b97\u529b\u8870\u51cf\u516c\u5f0f&#xff1b;\u7528\u673a\u623f\u591a\u8d27\u8f66\u8f66\u961f\u7c7b\u6bd4 NVLink \u94fe\u8def\u8c03\u5ea6&#xff1b;\u63d0\u4f9b\u7b97\u5b50\u7b49\u6548 PTX \u4eff\u771f&#xff1b;\u6c47\u603b\u5206\u5e03\u5f0f\u8bad\u7ec3\u68af\u5ea6\u9891\u7e41\u540c\u6b65\u3001\u8d85\u5927\u5f20\u91cf\u5e7f\u64ad\u3001\u591a\u673a\u6df7\u90e8\u8e29\u5751&#xff1b;\u533a\u5206\u5355\u673a \/ \u591a\u5361\u3001NVLink\/PCIe \u8fb9\u754c&#xff0c;\u6253\u901a\u5355\u673a HBM \u8c03\u5ea6\u4e0e\u591a\u5361\u5206\u5e03\u5f0f\u635f\u8017\u6a21\u578b\u30023. \u6838\u5fc3\u516c\u5f0f&#xff08;1&#xff09;\u8de8\u5361\u540c\u6b65\u7b97\u529b\u635f\u5931(Cycle_{local})&#xff1a;\u5355\u673a\u65e0\u540c\u6b65\u57fa\u51c6\u5468\u671f&#xff0c;(Cycle_{nvlink})&#xff1a;\u53e0\u52a0 NVLink \u540c\u6b65\u603b\u5468\u671f<br \/>\n(Loss_{nv} &#061; \\\\frac{Cycle_{nvlink}-Cycle_{local}}{Cycle_{local}} \\\\times 100%)&#xff08;2&#xff09;NVLink \u94fe\u8def\u51b2\u7a81\u8870\u51cf\u7cfb\u6570(Link_{total})&#xff1a;\u603b NVLink \u94fe\u8def&#xff0c;(Link_{used})\u5360\u7528\u94fe\u8def<br \/>\n(Coef_{nvlink} &#061; \\\\frac{Link_{total}}{Link_{total} &#043; Sync_{block_cycle}})&#xff08;3&#xff09;\u5f20\u91cf\u540c\u6b65\u8017\u65f6(T_{sync} &#061; \\\\frac{Tensor_{size}}{BW_{nvlink}} &#043; T_{barrier})4. \u6bd4\u55bbNVLink &#061; \u591a\u5361\u4e4b\u95f4\u4e13\u7528\u9ad8\u901f\u8d27\u8fd0\u5929\u6865&#xff0c;\u540c\u6b65\u7b97\u5b50 &#061; \u5929\u6865\u6536\u8d39\u7ad9\u540c\u6b65\u653e\u884c\u5c4f\u969c&#xff1b;<br \/>\n\u68af\u5ea6 allreduce &#061; \u591a\u8f66\u8d27\u7269\u6c47\u96c6\u7edf\u4e00\u79f0\u91cd&#xff0c;\u5168\u90e8\u8f66\u8f86\u505c\u4e0b\u7b49\u5f85\u5c4f\u969c&#xff0c;\u672c\u5730 GPU \u6d41\u6c34\u7ebf\u505c\u5de5&#xff1b;<br \/>\n\u9891\u7e41\u5c0f\u68af\u5ea6\u540c\u6b65&#xff1a;\u5929\u6865\u53cd\u590d\u5f00\u5173&#xff0c;\u6bcf\u8f6e\u8bad\u7ec3\u90fd\u8981\u505c\u8f66\u7b49\u5f85&#xff0c;\u672c\u5730 TC \u8ba1\u7b97\u5927\u91cf\u7a7a\u7a97&#xff1b;<br \/>\nPCIe &#061; \u4e61\u95f4\u5c0f\u8def&#xff0c;\u65e0\u4e13\u7528\u540c\u6b65\u786c\u4ef6\u7b97\u5b50&#xff0c;\u540c\u6b65\u635f\u8017\u8fdc\u9ad8\u4e8e NVLink\u3002<\/p>\n<\/li>\n<li>\n<p>\u63a8\u6f14\u4ee3\u7801 PTX &#043; \u9a71\u52a8\u4f2a\u4ee3\u7801<br \/>\n.version 8.3<br \/>\n.target sm90<br \/>\n\/\/ NVLink\u786c\u4ef6\u9690\u85cf\u540c\u6b65\u5c4f\u969c\u7b97\u5b50<br \/>\n.entry nvlink_barrier_sync (.reg.u32 card_group_id)<br \/>\n{<br \/>\n.reg.u32 wait_cnt;<br \/>\nmov wait_cnt, 0;<br \/>\nBAR_WAIT:<br \/>\n\/\/ \u7b49\u5f85\u7ec4\u5185\u6240\u6709\u5361\u5b8c\u6210\u672c\u5730\u8ba1\u7b97<br \/>\nsync.nvlink group, card_group_id;<br \/>\nadd.u32 wait_cnt, wait_cnt, 1;<br \/>\nsetp.lt.u32 %p, wait_cnt, 64;<br \/>\n&#064;%p bra BAR_WAIT;<br \/>\n\/\/ \u540c\u6b65\u5b8c\u6210\u91ca\u653e\u94fe\u8def&#xff0c;\u6062\u590d\u672c\u5730TC\u6d41\u6c34\u7ebf<br \/>\nunblock.tc;<br \/>\nret;<br \/>\n}<br \/>\n\/\/ NVLink allreduce\u786c\u4ef6\u5f52\u7ea6\u7b97\u5b50<br \/>\n.entry nvlink_allreduce_fp16 (.reg.u64 src, .reg.u64 dst, .reg.u32 elem)<br \/>\n{<br \/>\n\/\/ \u8de8\u5361\u94fe\u8def\u6279\u91cf\u4f20\u8f93<br \/>\ncopy.nvlink src, dst;<br \/>\n\/\/ \u786c\u4ef6\u539f\u751f\u5f52\u7ea6\u6c42\u548c<br \/>\nreduce.add.bf16 dst, src;<br \/>\nnvlink_barrier_sync(0);<br \/>\nret;<br \/>\n}<\/p>\n<\/li>\n<p>\u5185\u6838\u903b\u8f91<\/p>\n<p><span class=\"token comment\">\/\/ \u6bcf\u8f6e\u53cd\u5411\u4f20\u64ad\u81ea\u52a8\u8c03\u7528NVLink\u9690\u85cf\u7b97\u5b50<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">distributed_grad_sync<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> grad_tensor<span class=\"token punctuation\">,<\/span> uint32 elem_num<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6253\u65ad\u672c\u5730TC\u6d41\u6c34\u7ebf<\/span><br \/>\n    <span class=\"token function\">suspend_tensor_core<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u8c03\u7528\u786c\u4ef6\u8de8\u5361\u5f52\u7ea6\u7b97\u5b50<\/span><br \/>\n    <span class=\"token function\">cudaLaunchKernel<\/span><span class=\"token punctuation\">(<\/span>nvlink_allreduce_fp16<span class=\"token punctuation\">,<\/span> <span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">.<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u6062\u590d\u672c\u5730\u8ba1\u7b97<\/span><br \/>\n    <span class=\"token function\">resume_tensor_core<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<li>\u8e29\u5751<br \/>\n\u8e29\u5751&#xff1a;\u5c0f batch \u9891\u7e41\u68af\u5ea6\u540c\u6b65<br \/>\n\u73b0\u8c61&#xff1a;\u6bcf\u8fed\u4ee3\u6267\u884c\u4e00\u6b21 NVLink \u5c4f\u969c&#xff0c;\u540c\u6b65\u635f\u8017\u53e0\u52a0&#xff0c;\u6574\u4f53\u7b97\u529b\u635f\u5931\u8d85 20%&#xff1b;<br \/>\n\u4f18\u5316&#xff1a;\u68af\u5ea6\u7d2f\u79ef\u591a\u8f6e\u518d\u540c\u6b65&#xff0c;\u51cf\u5c11\u7b97\u5b50\u8c03\u7528\u6b21\u6570\u3002<br \/>\n\u8e29\u5751&#xff1a;\u591a\u4efb\u52a1\u5206\u5e03\u5f0f\u6df7\u90e8<br \/>\n\u73b0\u8c61&#xff1a;\u8bad\u7ec3\u540c\u6b65\u5360\u7528 NVLink \u5168\u90e8\u94fe\u8def&#xff0c;\u5361\u95f4\u5f20\u91cf\u4f20\u8f93\u6392\u961f&#xff1b;<br \/>\n\u4f18\u5316&#xff1a;\u5206\u5e03\u5f0f\u8bad\u7ec3\u8282\u70b9\u4e0d\u627f\u8f7d\u5728\u7ebf\u63a8\u7406\u3002<br \/>\n\u8e29\u5751\u7528 PCIe \u66ff\u4ee3 NVLink \u505a\u591a\u5361\u8bad\u7ec3<br \/>\n\u73b0\u8c61&#xff1a;\u65e0\u786c\u4ef6\u540c\u6b65\u7b97\u5b50&#xff0c;\u5168\u90e8\u8d70 CPU 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\u786c\u4ef6\u5185\u7f6e\u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\u5e26\u6765\u7684\u6d41\u6c34\u7ebf\u4e2d\u65ad\u635f\u8017\u3002NVLink \u94fe\u8def\u5b58\u5728\u72ec\u7acb\u786c\u4ef6\u540c\u6b65\u7b97\u5b50&#xff0c;\u8d1f\u8d23\u5361\u95f4\u5f20\u91cf\u5206\u53d1\u3001\u68af\u5ea6\u5f52\u7ea6\u3001\u5c4f\u969c\u540c\u6b65&#xff0c;\u7b97\u5b50\u4f1a\u6253\u65ad\u5355\u5361 TC\/HBM \u6d41\u6c34\u7ebf&#xff0c;\u4ea7\u751f\u8de8\u5361\u6c14\u6ce1\u3002<br \/>\n\u5355\u673a MPS\u3001HBM \u8c03\u5ea6\u4ec5\u5355\u5361\u8d44\u6e90\u4e89\u62a2&#xff0c;\u591a\u5361\u53e0\u52a0 NVLink \u540c\u6b65\u7b97\u5b50\u635f\u8017\u540e&amp;#x<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[50,664,427],"topic":[],"class_list":["post-95025","post","type-post","status-publish","format-standard","hentry","category-server","tag-50","tag-664","tag-427"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NVLink \u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\uff08\u591a\u5361 H200 \u5206\u5e03\u5f0f\u4e13\u5c5e\uff0cRTX \u65e0 NVLink\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/95025.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NVLink \u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\uff08\u591a\u5361 H200 \u5206\u5e03\u5f0f\u4e13\u5c5e\uff0cRTX \u65e0 NVLink\uff09 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u524d\u8a00\u5206\u5e03\u5f0f\u5927\u6a21\u578b\u8bad\u7ec3\u591a\u5361\u68af\u5ea6\u540c\u6b65\u3001\u5f20\u91cf\u5e7f\u64ad\u3001allreduce \u5ef6\u8fdf\u5c45\u9ad8\u4e0d\u4e0b&#xff0c;\u5f88\u591a\u4eba\u4ec5\u5f52\u548e\u4e8e NVLink \u5e26\u5bbd\u4e0d\u8db3&#xff0c;\u5ffd\u7565 GPU \u786c\u4ef6\u5185\u7f6e\u8de8\u5361\u540c\u6b65\u9690\u85cf\u7b97\u5b50\u5e26\u6765\u7684\u6d41\u6c34\u7ebf\u4e2d\u65ad\u635f\u8017\u3002NVLink \u94fe\u8def\u5b58\u5728\u72ec\u7acb\u786c\u4ef6\u540c\u6b65\u7b97\u5b50&#xff0c;\u8d1f\u8d23\u5361\u95f4\u5f20\u91cf\u5206\u53d1\u3001\u68af\u5ea6\u5f52\u7ea6\u3001\u5c4f\u969c\u540c\u6b65&#xff0c;\u7b97\u5b50\u4f1a\u6253\u65ad\u5355\u5361 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