{"id":34757,"date":"2026-08-03T16:58:57","date_gmt":"2026-08-03T08:58:57","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/how-to-optimize-memory-access-latency-in-numa-architecture\/"},"modified":"2026-08-03T17:05:45","modified_gmt":"2026-08-03T09:05:45","slug":"how-to-optimize-memory-access-latency-in-numa-architecture","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-to-optimize-memory-access-latency-in-numa-architecture\/","title":{"rendered":"\u5982\u4f55\u6700\u4f73\u5316 NUMA \u67b6\u69cb\u4e2d\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072"},"content":{"rendered":"<p>NUMA \u8a18\u61b6\u9ad4<a href=\"https:\/\/www.varidata.com\/zh-tw\/server\/tokyo\/\" target=\"_blank\">\u5b58\u53d6\u5ef6\u9072<\/a>\uff0c\u662f\u6307\u8655\u7406\u5668\u5f9e DRAM \u8b80\u53d6\u8cc7\u6599\u6240\u8017\u8cbb\u7684\u6642\u9593\u3002\u672c\u5730\u63d2\u69fd\u7684\u8a18\u61b6\u9ad4\u8acb\u6c42\u901a\u5e38\u53ef\u5728 60 \u5230 100 \u5948\u79d2\u5167\u5b8c\u6210\uff1b\u4e00\u65e6\u9700\u8981\u8de8\u8d8a UPI \u6216 QPI \u4e92\u9023\u5b58\u53d6\u9060\u7aef\u63d2\u69fd\uff0c\u5ef6\u9072\u5247\u6703\u63d0\u9ad8\u5230 200 \u6216 300 \u5948\u79d2\u3002\u9019\u7a2e\u8de8\u63d2\u69fd\u5b58\u53d6\u6703\u70ba<a href=\"https:\/\/www.varidata.com\/zh-tw\/server\/tokyo\/\" target=\"_blank\">\u5de5\u4f5c\u8ca0\u8f09<\/a>\u5e36\u4f86\u6700\u9ad8\u53ef\u9054 3 \u500d\u7684\u5ef6\u9072\u61f2\u7f70\u3002<\/p>\n<p>\u8981\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072\uff0c\u6838\u5fc3\u5728\u65bc\u6700\u5927\u5316\u8a18\u61b6\u9ad4\u672c\u5730\u6027\uff0c\u4e26\u6d88\u9664\u9060\u7aef\u63d2\u69fd\u6d41\u91cf\u3002\u900f\u904e\u5f37\u5236 CPU \u57f7\u884c\u7dd2\u7d81\u5b9a\u3001\u63a7\u5236\u9801\u9762\u914d\u7f6e\uff0c\u4ee5\u53ca\u5be6\u65bd\u62d3\u64b2\u611f\u77e5\u7684\u6838\u5fc3\u8abf\u6821\uff0c\u4f60\u53ef\u4ee5\u78ba\u4fdd\u7cfb\u7d71\u6548\u80fd\u9054\u5230\u5cf0\u503c\u3002<\/p>\n<h2>\u62d3\u64b2\u767c\u73fe\u8207\u5ef6\u9072\u5206\u6790<\/h2>\n<h3>\u5c0d\u61c9\u672c\u5730\u6027\u8ddd\u96e2<\/h3>\n<p>\u5728\u9032\u884c\u8a18\u61b6\u9ad4\u5b58\u53d6\u8abf\u6821\u4e4b\u524d\uff0c\u5fc5\u9808\u5148\u91d0\u6e05\u7cfb\u7d71\u7684\u786c\u9ad4\u62d3\u64b2\u3002ACPI \u7684\u7cfb\u7d71\u672c\u5730\u6027\u8ddd\u96e2\u8cc7\u8a0a\u8868\uff08SLIT\uff09\u63d0\u4f9b\u4e86 NUMA \u7bc0\u9ede\u4e4b\u9593\u76f8\u5c0d\u5b58\u53d6\u6210\u672c\u7684\u6bd4\u7387\u3002Linux \u6838\u5fc3\u6703\u8b80\u53d6\u8a72\u77e9\u9663\uff0c\u4e26\u4ee5\u7121\u91cf\u7db1\u6574\u6578\u7684\u5f62\u5f0f\u986f\u793a\u8ddd\u96e2\u503c\u3002\u901a\u5e38\uff0c\u672c\u5730\u5b58\u53d6\u57fa\u6e96\u503c\u70ba 10\uff1b\u82e5\u67d0\u500b\u9060\u7aef\u7bc0\u9ede\u7684\u8ddd\u96e2\u503c\u70ba 21\uff0c\u5247\u8868\u793a\u5b58\u53d6\u8a72\u9060\u7aef\u63d2\u69fd\u4e0a\u7684\u8a18\u61b6\u9ad4\uff0c\u5176\u8acb\u6c42\u5ef6\u9072\u5927\u7d04\u662f\u672c\u5730\u5b58\u53d6\u7684\u5169\u500d\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u57f7\u884c <code>numactl<\/code> \u6aa2\u8996\u9019\u4e9b\u76f8\u5c0d\u672c\u5730\u6027\u8ddd\u96e2\uff1a<\/p>\n<pre><code>numactl --hardware<\/code><\/pre>\n<p>\u8a72\u8f38\u51fa\u6703\u986f\u793a\u7bc0\u9ede\u6e05\u55ae\u4ee5\u53ca\u76f8\u5c0d\u8ddd\u96e2\u77e9\u9663\u3002<\/p>\n<h3>\u4f7f\u7528 Perf \u5206\u6790\u5b58\u53d6\u5ef6\u9072<\/h3>\n<p>\u4f60\u53ef\u4ee5\u85c9\u52a9\u6a19\u6e96 Linux \u6548\u80fd\u5206\u6790\u5de5\u5177\uff0c\u6e2c\u91cf\u5373\u6642\u8a18\u61b6\u9ad4\u6d41\u91cf\u3002\u57f7\u884c <code>numastat<\/code>\uff0c\u53ef\u6bd4\u8f03\u7cfb\u7d71\u5404\u7bc0\u9ede\u4e0a\u7684\u8a18\u61b6\u9ad4\u914d\u7f6e\u8a08\u6578\u5668\u3002\u5982\u679c <code>numa_miss<\/code> \u6216 <code>other_node<\/code> \u5217\u4e2d\u7684\u6578\u503c\u504f\u9ad8\uff0c\u5c31\u8868\u793a\u9060\u7aef\u5b58\u53d6\u61f2\u7f70\u983b\u7e41\u767c\u751f\u3002<\/p>\n<p>\u82e5\u9700\u9032\u884c\u66f4\u7cbe\u78ba\u7684\u786c\u9ad4\u53d6\u6a23\uff0c\u53ef\u4f7f\u7528\u5e36\u6709\u8a18\u61b6\u9ad4\u5b58\u53d6\u8a08\u6578\u5668\u7684 <code>perf stat<\/code>\uff1a<\/p>\n<pre><code>perf stat -e numa:numa_hit,numa:numa_miss .\/your_application<\/code><\/pre>\n<p>\u8a72\u547d\u4ee4\u6703\u5728\u7a0b\u5f0f\u57f7\u884c\u671f\u9593\uff0c\u5c0d\u672c\u5730\u7bc0\u9ede\u547d\u4e2d\u8207\u9060\u7aef\u7bc0\u9ede\u672a\u547d\u4e2d\u9032\u884c\u6548\u80fd\u5206\u6790\u3002<\/p>\n<h3>\u8a55\u4f30\u786c\u9ad4\u4e92\u9023\u6d41\u91cf<\/h3>\n<p>\u5927\u91cf\u8de8\u63d2\u69fd\u6d41\u91cf\u6703\u4f7f Intel UPI \u6216 AMD Infinity Fabric \u7b49\u786c\u9ad4\u4e92\u9023\u93c8\u8def\u8da8\u65bc\u98fd\u548c\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>perf c2c<\/code>\uff08cache-to-cache\uff09\u5206\u6790\uff0c\u8a55\u4f30\u63d2\u69fd\u9593\u983b\u5bec\u8207\u5ef6\u9072\u74f6\u9838\u3002\u6b64\u5de5\u5177\u80fd\u5920\u5b9a\u4f4d\u507d\u5171\u4eab\u554f\u984c\uff0c\u4e26\u8ffd\u8e64\u8de8\u63d2\u69fd\u7684\u9060\u7aef\u5feb\u53d6\u5217\u547d\u4e2d\u60c5\u6cc1\u3002<\/p>\n<blockquote>\n<p><strong>\u63d0\u793a\uff1a<\/strong> \u76e3\u63a7 <code>numastat<\/code> \u4e2d\u7684 <code>numa_foreign<\/code> \u6307\u6a19\uff0c\u53ef\u5e6b\u52a9\u4f60\u767c\u73fe\u884c\u7a0b\u662f\u5426\u6b63\u5728\u5f9e\u5176\u6240\u5206\u914d\u672c\u5730\u63d2\u69fd\u57df\u4e4b\u5916\u53d6\u5f97\u8cc7\u6599\u3002<\/p>\n<\/blockquote>\n<h2>\u57f7\u884c\u7dd2\u7d81\u5b9a\u8207\u8a18\u61b6\u9ad4\u672c\u5730\u6027<\/h2>\n<p>\u4f5c\u696d\u7cfb\u7d71\u6392\u7a0b\u5668\u901a\u5e38\u6703\u70ba\u4e86\u8ca0\u8f09\u5e73\u8861\uff0c\u983b\u7e41\u5730\u5728\u4e0d\u540c CPU \u6838\u5fc3\u4e4b\u9593\u9077\u79fb\u6d3b\u8e8d\u57f7\u884c\u7dd2\u3002\u5728 NUMA \u7cfb\u7d71\u4e2d\uff0c\u9019\u7a2e\u9810\u8a2d\u884c\u70ba\u6703\u7834\u58de\u8a18\u61b6\u9ad4\u672c\u5730\u6027\u3002\u7576\u57f7\u884c\u7dd2\u9077\u79fb\u5230\u9060\u7aef\u63d2\u69fd\u4e0a\u7684\u6838\u5fc3\u5f8c\uff0c\u5b83\u5fc5\u9808\u900f\u904e\u4e92\u9023\u93c8\u8def\u5b58\u53d6\u539f\u5148\u7bc0\u9ede\u4e0a\u7684\u8cc7\u6599\uff0c\u5f9e\u800c\u5f15\u5165\u984d\u5916\u5ef6\u9072\u3002\u8981\u6d88\u9664\u6b64\u4e00\u61f2\u7f70\uff0c\u4f60\u9700\u8981\u5c07\u57f7\u884c\u7dd2\u8207\u8a18\u61b6\u9ad4\u914d\u7f6e\u90fd\u56b4\u683c\u7d81\u5b9a\u5230\u672c\u5730\u786c\u9ad4\u8cc7\u6e90\u3002<\/p>\n<h3>\u900f\u904e Taskset \u7d81\u5b9a\u57f7\u884c\u7dd2<\/h3>\n<p>\u9810\u8a2d\u7684 Linux \u6392\u7a0b\u5668\u512a\u5148\u8003\u91cf\u6574\u9ad4\u7cfb\u7d71\u541e\u5410\u91cf\uff0c\u800c\u975e\u57f7\u884c\u7dd2\u5c64\u7d1a\u7684\u8a18\u61b6\u9ad4\u672c\u5730\u6027\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>taskset<\/code> \u5de5\u5177\u76f4\u63a5\u63a7\u5236 CPU \u89aa\u548c\u6027\uff0c\u5f9e\u800c\u8986\u84cb\u9019\u7a2e\u9810\u8a2d\u884c\u70ba\u3002<\/p>\n<p>\u7576\u4f60\u628a\u57f7\u884c\u57f7\u884c\u7dd2\u7d81\u5b9a\u5230\u7279\u5b9a CPU \u6838\u5fc3\u6642\uff0c\u5c31\u80fd\u4f7f\u6838\u5fc3\u7684 L1\u3001L2 \u8207 L3 \u5feb\u53d6\u7dad\u6301\u5728\u300c\u71b1\u300d\u72c0\u614b\u3002\u9019\u7a2e\u505a\u6cd5\u53ef\u9632\u6b62\u4f5c\u696d\u7cfb\u7d71\u5c07\u884c\u7a0b\u9077\u79fb\u5230\u5176\u4ed6\u63d2\u69fd\u3002<\/p>\n<p>\u57f7\u884c\u4ee5\u4e0b\u547d\u4ee4\uff0c\u53ef\u5c07\u4e00\u500b\u884c\u7a0b\u7d81\u5b9a\u5230 NUMA \u7bc0\u9ede 0 \u7684\u524d 8 \u500b\u6838\u5fc3\uff1a<\/p>\n<pre><code>taskset -c 0-7 .\/your_application<\/code><\/pre>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u900f\u904e\u884c\u7a0b ID\uff08PID\uff09\uff0c\u5c07\u4e00\u500b\u5df2\u7d93\u5728\u57f7\u884c\u4e2d\u7684\u884c\u7a0b\u7d81\u5b9a\u5230\u6307\u5b9a\u6838\u5fc3\uff1a<\/p>\n<pre><code>taskset -p -c 0-7 12345<\/code><\/pre>\n<p>\u57f7\u884c\u7dd2\u7d81\u5b9a\u80fd\u5920\u78ba\u4fdd\u6307\u4ee4\u5728\u9760\u8fd1\u672c\u5730\u5feb\u53d6\u5217\u7684\u4f4d\u7f6e\u57f7\u884c\u3002\u4e0d\u904e\uff0c<code>taskset<\/code> \u53ea\u63a7\u5236 CPU \u57f7\u884c\u89aa\u548c\u6027\u3002\u82e5\u8981\u771f\u6b63\u6700\u4f73\u5316\u8de8\u7bc0\u9ede\u8a18\u61b6\u9ad4\u5b58\u53d6\u6a21\u5f0f\uff0c\u4f60\u9084\u5fc5\u9808\u7ba1\u7406\u5be6\u9ad4\u8a18\u61b6\u9ad4\u914d\u7f6e\u3002<\/p>\n<h3>\u4f7f\u7528 Numactl \u9650\u5236\u914d\u7f6e<\/h3>\n<p>\u50c5\u50c5\u7d81\u5b9a\u57f7\u884c\u7dd2\uff0c\u4e26\u4e0d\u80fd\u4fdd\u8b49\u61c9\u7528\u7a0b\u5f0f\u4e00\u5b9a\u6703\u5728\u672c\u5730\u7bc0\u9ede\u914d\u7f6e\u8a18\u61b6\u9ad4\u3002\u4e00\u500b\u57f7\u884c\u65bc Socket 0 \u4e0a\u7684\u884c\u7a0b\uff0c\u5728\u9810\u8a2d\u7b56\u7565\u4e0b\uff0c\u4ecd\u6709\u53ef\u80fd\u5c07 RAM \u914d\u7f6e\u5230 Socket 1\u3002\u56e0\u6b64\uff0c\u4f60\u5fc5\u9808\u4f7f\u7528 <code>numactl<\/code> \u540c\u6642\u5f37\u5236\u57f7\u884c\u300c\u57f7\u884c\u4f4d\u7f6e\u300d\u8207\u300c\u914d\u7f6e\u4f4d\u7f6e\u300d\u5169\u985e\u898f\u5247\u3002<\/p>\n<p>\u57f7\u884c\u5de5\u4f5c\u8ca0\u8f09\u6642\uff0c\u53ef\u660e\u78ba\u6307\u5b9a CPU \u8207\u8a18\u61b6\u9ad4\u7bc0\u9ede\u9650\u5236\uff1a<\/p>\n<pre><code>numactl --cpunodebind=0 --membind=0 .\/your_application<\/code><\/pre>\n<p><code>--membind<\/code> \u7b56\u7565\u662f\u4e00\u7a2e\u56b4\u683c\u7684\u914d\u7f6e\u9650\u5236\uff0c\u5b83\u6703\u5c07\u914d\u7f6e\u64cd\u4f5c\u9650\u5236\u5728\u6307\u5b9a NUMA \u7bc0\u9ede\u4e0a\u3002\u5982\u679c\u9019\u4e9b\u7bc0\u9ede\u7121\u6cd5\u63d0\u4f9b\u8db3\u5920\u8a18\u61b6\u9ad4\uff0c\u914d\u7f6e\u6703\u7acb\u5373\u5931\u6557\uff0c\u800c\u4e0d\u6703\u56de\u9000\u5230\u5176\u4ed6\u672a\u6307\u5b9a\u7bc0\u9ede\u3002<\/p>\n<p>\u5982\u679c\u4f60\u7684\u61c9\u7528\u9700\u8981\u66f4\u9ad8\u53ef\u7528\u6027\uff0c\u56b4\u683c\u914d\u7f6e\u5931\u6557\u53ef\u80fd\u6703\u5f71\u97ff\u696d\u52d9\u9023\u7e8c\u6027\u3002\u6b64\u6642\u53ef\u4f7f\u7528 <code>--preferred<\/code> \u4f5c\u70ba\u66f4\u5f48\u6027\u7684\u7b56\u7565\uff1a<\/p>\n<pre><code>numactl --cpunodebind=0 --preferred=0 .\/your_application<\/code><\/pre>\n<p><code>--preferred<\/code> \u53c3\u6578\u6703\u6307\u793a\u6838\u5fc3\u512a\u5148\u5728\u7bc0\u9ede 0 \u4e0a\u914d\u7f6e RAM\uff1b\u53ea\u6709\u7576\u7bc0\u9ede 0 \u7684\u5be6\u9ad4\u8a18\u61b6\u9ad4\u4e0d\u8db3\u6642\uff0c\u6838\u5fc3\u624d\u6703\u56de\u9000\u5230\u9060\u7aef\u7bc0\u9ede\u3002<\/p>\n<h3>\u5982\u4f55\u900f\u904e\u9077\u79fb\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u5b58\u53d6<\/h3>\n<p>\u5728\u9ad8\u5cf0\u8ca0\u8f09\u671f\u9593\uff0c\u5de5\u4f5c\u8ca0\u8f09\u5e38\u5e38\u6703\u8d85\u51fa\u55ae\u4e00\u63d2\u69fd\u7684\u8cc7\u6e90\u4e0a\u9650\u3002\u7576\u61c9\u7528\u8de8\u8d8a\u591a\u500b NUMA \u57df\u57f7\u884c\u6642\uff0c\u521d\u59cb\u7684\u975c\u614b\u7d81\u5b9a\u5c31\u4e0d\u518d\u8db3\u5920\u3002\u6b64\u6642\uff0c\u4f60\u5fc5\u9808\u5be6\u65bd\u52d5\u614b\u8a18\u61b6\u9ad4\u9801\u9762\u9077\u79fb\u7b56\u7565\uff0c\u624d\u80fd\u7dad\u6301\u5cf0\u503c\u6548\u80fd\u3002<\/p>\n<blockquote>\n<p><strong>\u63d0\u793a\uff1a<\/strong> \u5728\u57f7\u884c\u74b0\u5883\u767c\u751f\u8b8a\u5316\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>migratepages<\/code> \u5de5\u5177\uff0c\u5728\u4e0d\u4e2d\u65b7\u751f\u7522\u670d\u52d9\u7684\u60c5\u6cc1\u4e0b\uff0c\u5c07\u5b8c\u6574\u8a18\u61b6\u9ad4\u5360\u7528\u9077\u79fb\u5230\u5176\u4ed6\u7bc0\u9ede\u3002<\/p>\n<\/blockquote>\n<p>\u5982\u679c\u67d0\u500b\u884c\u7a0b\u7684\u4e3b\u8981\u8a08\u7b97\u8ca0\u8f09\u8f49\u79fb\u5230\u4e86\u7bc0\u9ede 1\uff0c\u4f60\u53ef\u4ee5\u624b\u52d5\u5c07\u5176\u73fe\u6709\u9801\u9762\u5f9e\u7bc0\u9ede 0 \u9077\u79fb\u5230\u7bc0\u9ede 1\uff1a<\/p>\n<pre><code>migratepages 12345 0 1<\/code><\/pre>\n<p>\u8a72\u547d\u4ee4\u6703\u6383\u63cf\u884c\u7a0b ID \u70ba 12345 \u7684\u884c\u7a0b\uff0c\u627e\u51fa\u4f4d\u65bc\u7bc0\u9ede 0 \u4e0a\u7684\u5be6\u9ad4\u9801\u9762\uff0c\u4e26\u5c07\u5176\u5373\u6642\u9077\u79fb\u5230\u7bc0\u9ede 1\u3002<\/p>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u4f9d\u8cf4\u81ea\u52d5\u5316\u6838\u5fc3\u6a5f\u5236\uff0c\u6216\u85c9\u52a9\u81ea\u8a02\u61c9\u7528\u908f\u8f2f\u4f86\u5b8c\u6210\u9077\u79fb\uff1a<\/p>\n<ul>\n<li>\n<p><strong>\u6838\u5fc3 AutoNUMA \u9077\u79fb\uff1a<\/strong> Linux \u6838\u5fc3\u6703\u6301\u7e8c\u6383\u63cf\u6d3b\u8e8d\u884c\u7a0b\u7684\u8a18\u61b6\u9ad4\u9801\u9762\uff0c\u8b58\u5225\u9060\u7aef\u5b58\u53d6\uff0c\u4e26\u81ea\u52d5\u5c07\u5be6\u9ad4\u9801\u9762\u79fb\u52d5\u5230\u66f4\u9760\u8fd1\u5b58\u53d6\u57f7\u884c\u7dd2\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u660e\u78ba\u4f7f\u7528\u8005\u7a7a\u9593\u9077\u79fb\uff1a<\/strong> C\/C++ \u61c9\u7528\u53ef\u4ee5\u547c\u53eb <code>move_pages()<\/code> \u7cfb\u7d71\u547c\u53eb\uff0c\u6839\u64da\u57f7\u884c\u6642\u6307\u6a19\uff0c\u76f4\u63a5\u9077\u79fb\u7279\u5b9a\u8a18\u61b6\u9ad4\u4f4d\u5740\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u52d5\u614b\u9801\u9762\u9077\u79fb\u6703\u5728\u9077\u79fb\u968e\u6bb5\u5e36\u4f86\u5373\u6642\u8655\u7406\u958b\u92b7\u3002\u4f46\u5c0d\u65bc\u9577\u6642\u9593\u57f7\u884c\u7684\u884c\u7a0b\u800c\u8a00\uff0c\u5c07\u6d3b\u8e8d\u8cc7\u6599\u96c6\u9077\u79fb\u5230\u672c\u5730\u63d2\u69fd\u8a18\u61b6\u9ad4\uff0c\u6536\u76ca\u901a\u5e38\u7acb\u7aff\u898b\u5f71\u3002\u4f60\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u8de8\u63d2\u69fd UPI \u6d41\u91cf\uff0c\u4e26\u6301\u7e8c\u6700\u4f73\u5316\u5b58\u53d6\u5ef6\u9072\u3002<\/p>\n<h2>\u6838\u5fc3\u914d\u7f6e\u7b56\u7565\u8207\u9801\u9762\u8abf\u6821<\/h2>\n<p>Linux \u900f\u904e\u7cfb\u7d71\u547c\u53eb\u63d0\u4f9b\u4e86\u591a\u7a2e\u8a18\u61b6\u9ad4\u7b56\u7565\uff0c\u5e6b\u52a9\u4f60\u63a7\u5236\u9801\u9762\u5728 NUMA \u7bc0\u9ede\u4e4b\u9593\u7684\u653e\u7f6e\u65b9\u5f0f\u3002\u4f60\u53ef\u4ee5\u6839\u64da\u61c9\u7528\u884c\u70ba\u914d\u7f6e\u9019\u4e9b\u6838\u5fc3\u6a5f\u5236\uff0c\u4ee5\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u5b58\u53d6\u6548\u80fd\u3002<\/p>\n<h3>\u672c\u5730\u914d\u7f6e\u8207\u4ea4\u932f\u914d\u7f6e<\/h3>\n<p>Linux \u6838\u5fc3\u652f\u63f4\u591a\u7a2e\u7b56\u7565\u65d7\u6a19\uff0c\u7528\u65bc\u6307\u5b9a\u8a18\u61b6\u9ad4\u7bc0\u9ede\u9078\u64c7\u65b9\u5f0f\uff1a<\/p>\n<ul>\n<li>\n<p><code>MPOL_BIND<\/code>\uff1a\u56b4\u683c\u5c07\u914d\u7f6e\u9650\u5236\u5728\u6307\u5b9a\u7bc0\u9ede\u96c6\u5408\u5167\u3002<\/p>\n<\/li>\n<li>\n<p><code>MPOL_PREFERRED<\/code>\uff1a\u512a\u5148\u9078\u64c7\u55ae\u4e00\u7bc0\u9ede\uff1b\u7576\u9996\u9078 NUMA \u7bc0\u9ede\u8a18\u61b6\u9ad4\u8017\u76e1\u6642\uff0c\u7b56\u7565\u6703\u81ea\u52d5\u56de\u9000\u5230\u5176\u4ed6\u53ef\u7528 NUMA \u7bc0\u9ede\uff0c\u800c\u4e0d\u662f\u56de\u50b3\u932f\u8aa4\u3002<\/p>\n<\/li>\n<li>\n<p><code>MPOL_INTERLEAVE<\/code>\uff1a\u4ee5\u8f2a\u8a62\u65b9\u5f0f\uff0c\u5c07\u914d\u7f6e\u5e73\u5747\u5206\u6563\u5230\u591a\u500b\u7bc0\u9ede\u4e0a\u3002<\/p>\n<\/li>\n<\/ul>\n<p>\u5118\u7ba1 <code>MPOL_BIND<\/code> \u80fd\u63d0\u4f9b\u8f03\u4f4e\u7684\u672c\u5730\u5ef6\u9072\uff0c\u4f46\u5728\u67d0\u4e9b\u8a18\u61b6\u9ad4\u5b58\u53d6\u6a21\u5f0f\u4e0b\uff0c<code>MPOL_INTERLEAVE<\/code> \u7684\u8868\u73fe\u53cd\u800c\u66f4\u4f73\uff1a<\/p>\n<ul>\n<li>\n<p><strong>\u5927\u8a18\u61b6\u9ad4\u5360\u7528\uff1a<\/strong> \u914d\u7f6e\u5340\u57df\u8f03\u5927\uff0c\u901a\u5e38\u70ba 1 MB \u6216\u4ee5\u4e0a\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5e73\u5747\u5b58\u53d6\u6a21\u5f0f\uff1a<\/strong> \u5c0d\u5df2\u914d\u7f6e\u8a18\u61b6\u9ad4\u5340\u57df\u7684\u5b58\u53d6\u8acb\u6c42\u5206\u5e03\u8f03\u70ba\u5747\u8861\u3002<\/p>\n<\/li>\n<li>\n<p><strong>\u5faa\u5e8f\u6216\u4e32\u6d41\u5b58\u53d6\uff1a<\/strong> \u5b58\u53d6\u6a21\u5f0f\u65e8\u5728\u900f\u904e\u5c07\u9801\u9762\u914d\u7f6e\u8207\u4e26\u767c\u5b58\u53d6\u5206\u6563\u5230\u591a\u500b NUMA \u7bc0\u9ede\uff0c\u800c\u975e\u9650\u5236\u65bc\u55ae\u4e00\u7bc0\u9ede\uff0c\u4ee5\u6700\u5927\u5316\u8a18\u61b6\u9ad4\u983b\u5bec\u3002<\/p>\n<\/li>\n<\/ul>\n<h3>\u7ba1\u7406\u900f\u660e\u5de8\u9801<\/h3>\n<p>\u900f\u660e\u5de8\u9801\uff08Transparent Huge Pages\uff0cTHP\uff09\u900f\u904e\u914d\u7f6e 2 MB \u6216 1 GB \u7684\u8a18\u61b6\u9ad4\u9801\u9762\uff0c\u800c\u4e0d\u662f\u6a19\u6e96\u7684 4 KB \u9801\u9762\uff0c\u4f86\u6e1b\u5c11\u8f49\u8b6f\u5f8c\u5099\u7de9\u885d\u5340\uff08TLB\uff09\u672a\u547d\u4e2d\u3002\u7136\u800c\uff0c\u5c0d\u65bc\u5373\u6642\u5de5\u4f5c\u8ca0\u8f09\uff0c\u7576\u6838\u5fc3\u9700\u8981\u5728\u9060\u7aef\u63d2\u69fd\u9593\u914d\u7f6e\u6216\u62c6\u5206\u9019\u4e9b\u5de8\u9801\u6642\uff0c\u5e38\u5e38\u6703\u5f15\u767c\u5ef6\u9072\u5c16\u5cf0\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u4f60\u5c07 THP \u8a2d\u5b9a\u70ba <code>madvise<\/code> \u6a21\u5f0f\uff0c\u4ee5\u4fbf\u7531\u61c9\u7528\u7a0b\u5f0f\u660e\u78ba\u63a7\u5236\u662f\u5426\u4f7f\u7528\u5de8\u9801\u3002<\/p>\n<pre><code>echo madvise &gt; \/sys\/kernel\/mm\/transparent_hugepage\/enabled<\/code><\/pre>\n<h3>\u7cbe\u7d30\u8abf\u6574 AutoNUMA \u5e73\u8861<\/h3>\n<p>AutoNUMA \u6703\u9031\u671f\u6027\u6383\u63cf\u6d3b\u8e8d\u57f7\u884c\u7dd2\u7684\u8a18\u61b6\u9ad4\u4f4d\u7f6e\uff0c\u4ee5\u6700\u4f73\u5316\u8de8\u63d2\u69fd\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u3002\u6838\u5fc3\u6703\u5c07\u653e\u932f\u4f4d\u7f6e\u7684\u9801\u9762\u9077\u79fb\u5230\u66f4\u9760\u8fd1\u57f7\u884c\u57f7\u884c\u7dd2\u7684\u7bc0\u9ede\u3002<\/p>\n<p>\u4f46\u9019\u7a2e\u81ea\u52d5\u9801\u9762\u6383\u63cf\u6703\u5f15\u5165 CPU \u958b\u92b7\uff0c\u4e26\u5e36\u4f86\u4e0d\u53ef\u9810\u6e2c\u7684\u5ef6\u9072\u6296\u52d5\u3002\u5c0d\u65bc\u5373\u6642\u7cfb\u7d71\uff0c\u61c9\u8a72\u95dc\u9589 AutoNUMA \u5e73\u8861\uff0c\u8f49\u800c\u4f9d\u8cf4\u660e\u78ba\u7684\u975c\u614b\u8a18\u61b6\u9ad4\u653e\u7f6e\u7b56\u7565\uff1a<\/p>\n<pre><code>sysctl -w kernel.numa_balancing=0<\/code><\/pre>\n<h2>\u61c9\u7528\u7a0b\u5f0f\u8207\u5171\u4eab\u8a18\u61b6\u9ad4\u8abf\u6821<\/h2>\n<h3>\u8a2d\u5b9a Pthread \u7684 NUMA \u89aa\u548c\u6027<\/h3>\n<p>\u4f60\u53ef\u4ee5\u900f\u904e\u7a0b\u5f0f\u8a2d\u8a08\u65b9\u5f0f\uff0c\u5c07 C\/C++ \u57f7\u884c\u7dd2\u7d81\u5b9a\u5230\u7279\u5b9a NUMA \u7bc0\u9ede\uff0c\u5f9e\u800c\u6700\u4f73\u5316\u61c9\u7528\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u3002\u6a19\u6e96\u57f7\u884c\u6642\u7cfb\u7d71\u901a\u5e38\u4f9d\u8cf4\u5916\u90e8\u8173\u672c\uff0c\u800c\u76f4\u63a5\u5728 C \u5c64\u9032\u884c\u57f7\u884c\u7dd2\u7d81\u5b9a\uff0c\u5247\u80fd\u63d0\u4f9b\u66f4\u7cbe\u7d30\u7684\u786c\u9ad4\u63a7\u5236\u3002<\/p>\n<p>\u4f7f\u7528 POSIX \u57f7\u884c\u7dd2\u51fd\u5f0f\u5eab\u4e26\u7d50\u5408 <code>libnuma<\/code> \u958b\u767c\u5957\u4ef6\uff0c\u4f60\u53ef\u4ee5\u5728\u61c9\u7528\u7a0b\u5f0f\u5167\u90e8\u5be6\u73fe\u660e\u78ba\u89aa\u548c\u6027\u63a7\u5236\uff1a<\/p>\n<pre><code>#include &lt;pthread.h&gt;\r\n#include &lt;numa.h&gt;\r\n\r\nvoid bind_thread_to_node(pthread_t thread, int node_id) {\r\n    struct bitmask *cpus = numa_allocate_cpumask();\r\n    numa_node_to_cpus(node_id, cpus);\r\n    pthread_setaffinity_np(thread, sizeof(cpu_set_t), (cpu_set_t *)cpus-&gt;maskp);\r\n    numa_free_cpumask(cpus);\r\n}<\/code><\/pre>\n<p>\u5728\u521d\u59cb\u5316\u968e\u6bb5\u7d81\u5b9a\u5de5\u4f5c\u57f7\u884c\u7dd2\uff0c\u53ef\u9632\u6b62\u57f7\u884c\u7dd2\u9077\u79fb\u5e36\u4f86\u7684\u6548\u80fd\u640d\u5931\u3002\u5c07\u57f7\u884c\u7dd2\u7d81\u5b9a\u8207 <code>numa_alloc_onnode()<\/code> \u914d\u7f6e\u7d50\u5408\u4f7f\u7528\uff0c\u80fd\u5920\u78ba\u4fdd\u672c\u5730\u5feb\u53d6\u89aa\u548c\u6027\u3002<\/p>\n<h3>\u6700\u4f73\u5316\u5171\u4eab\u8a18\u61b6\u9ad4\u8207\u884c\u7a0b\u9593\u901a\u8a0a<\/h3>\n<p>\u900f\u904e POSIX \u6216 System V \u5171\u4eab\u8a18\u61b6\u9ad4\u5be6\u4f5c\u7684\u884c\u7a0b\u9593\u901a\u8a0a\uff08IPC\uff09\uff0c\u540c\u6a23\u9700\u8981\u660e\u78ba\u653e\u7f6e\u7b56\u7565\u3002\u9810\u8a2d\u60c5\u6cc1\u4e0b\uff0c\u5171\u4eab\u8a18\u61b6\u9ad4\u5340\u6bb5\u7684\u5be6\u9ad4\u9801\u9762\u6703\u914d\u7f6e\u5230\u300c\u9996\u6b21\u5beb\u5165\u8a72\u8a18\u61b6\u9ad4\u7684\u884c\u7a0b\u6240\u5728 NUMA \u7bc0\u9ede\u300d\u4e0a\u3002\u7576\u591a\u500b\u5de5\u4f5c\u884c\u7a0b\u8de8\u63d2\u69fd\u8b80\u53d6\u9019\u4e9b\u8cc7\u6599\u6642\uff0c\u9019\u7a2e\u9810\u8a2d\u884c\u70ba\u6703\u9020\u6210\u56b4\u91cd\u7684\u5ef6\u9072\u74f6\u9838\u3002<\/p>\n<p>\u4f60\u53ef\u4ee5\u900f\u904e\u660e\u78ba\u8a2d\u5b9a <code>mbind()<\/code> \u7b56\u7565\uff0c\u4f86\u5e73\u8861\u5171\u4eab\u8cc7\u6599\u7d50\u69cb\uff1a<\/p>\n<pre><code>#include &lt;numaif.h&gt;\r\n\r\nmbind(shared_memory_ptr, size, MPOL_INTERLEAVE, nodemask, maxnode, MPOL_MF_MOVE);<\/code><\/pre>\n<p>\u8a72\u7cfb\u7d71\u547c\u53eb\u6703\u5c07\u5171\u4eab\u5feb\u53d6\u5217\u5e73\u5747\u5206\u6563\u5230\u53c3\u8207\u8655\u7406\u7684\u5404\u500b\u786c\u9ad4\u63d2\u69fd\u4e2d\u3002<\/p>\n<h3>\u914d\u7f6e\u5bb9\u5668\u57f7\u884c\u6642\u89aa\u548c\u6027<\/h3>\n<p>\u73fe\u4ee3\u96f2\u7aef\u74b0\u5883\u901a\u5e38\u900f\u904e Docker \u8207 Kubernetes \u7b49\u5bb9\u5668\u57f7\u884c\u6642\u4f86\u627f\u8f09\u61c9\u7528\u3002\u5982\u679c\u4e0d\u9032\u884c\u914d\u7f6e\uff0c\u5bb9\u5668\u5de5\u4f5c\u8ca0\u8f09\u6703\u5728\u5bbf\u4e3b\u6a5f\u6240\u6709\u63d2\u69fd\u9593\u52d5\u614b\u6f02\u79fb\uff0c\u9032\u800c\u5f15\u5165\u8f03\u9ad8\u7684\u4e92\u9023\u5b58\u53d6\u5ef6\u9072\u3002<\/p>\n<blockquote>\n<p><strong>\u63d0\u793a\uff1a<\/strong> \u70ba Kubernetes Kubelet \u8a2d\u5b9a <code>--topology-manager-policy=single-numa-node<\/code> \u53c3\u6578\uff0c\u53ef\u4ee5\u70ba\u5ef6\u9072\u654f\u611f\u578b Pod \u4fdd\u8b49\u53ef\u5c0d\u9f4a\u7684 CPU \u8207\u8a18\u61b6\u9ad4\u914d\u7f6e\u3002<\/p>\n<\/blockquote>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u900f\u904e\u975c\u614b CPU \u96c6\u5408\u914d\u7f6e Docker \u5bb9\u5668\uff1a<\/p>\n<pre><code>docker run -d --cpuset-cpus=\"0-7\" --cpuset-mems=\"0\" your_image<\/code><\/pre>\n<p>\u8a72\u547d\u4ee4\u6703\u5c07\u5bb9\u5668\u5316\u884c\u7a0b\u56b4\u683c\u7d81\u5b9a\u5230\u7bc0\u9ede 0 \u7684 CPU \u6838\u5fc3\u8207\u672c\u5730 RAM\u3002<\/p>\n<div class=\"qc-divider-wrapper\">\n<div class=\"qc-divider\" style=\"border-top-style: solid;width: 100%\"><\/div>\n<\/div>\n<p>\u8981\u6d88\u9664\u8de8\u7bc0\u9ede\u8a18\u61b6\u9ad4\u5ef6\u9072\uff0c\u95dc\u9375\u5728\u65bc\u63a7\u5236\u300c\u8cc7\u6599\u653e\u5728\u54ea\u88e1\u300d\u4ee5\u53ca\u300c\u57f7\u884c\u7dd2\u8dd1\u5728\u54ea\u88e1\u300d\u3002\u8acb\u4f9d\u7167\u4ee5\u4e0b\u6280\u8853\u6e05\u55ae\u6700\u4f73\u5316\u7cfb\u7d71\u4e2d\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\uff1a<\/p>\n<ul>\n<li>\n<p>\u4f7f\u7528 <code>numactl --hardware<\/code> \u5c0d\u61c9\u63d2\u69fd\u9593\u7684\u76f8\u5c0d\u8ddd\u96e2\u3002<\/p>\n<\/li>\n<li>\n<p>\u900f\u904e <code>taskset<\/code> \u8207 <code>numactl<\/code> \u7d81\u5b9a\uff0c\u5f37\u5236\u5be6\u65bd\u56b4\u683c\u7684 CPU \u8207\u8a18\u61b6\u9ad4\u89aa\u548c\u6027\u3002<\/p>\n<\/li>\n<li>\n<p>\u9078\u64c7\u660e\u78ba\u7684\u57f7\u884c\u6642\u9801\u9762\u914d\u7f6e\u7b56\u7565\uff0c\u4e26\u8abf\u6821 AutoNUMA \u8a2d\u5b9a\u3002<\/p>\n<\/li>\n<\/ul>\n<blockquote>\n<p><strong>\u63d0\u793a\uff1a<\/strong> \u6301\u7e8c\u4f7f\u7528 <code>perf<\/code> \u8ffd\u8e64\u786c\u9ad4\u6548\u80fd\u8a08\u6578\u5668\uff0c\u6709\u52a9\u65bc\u4f60\u5feb\u901f\u767c\u73fe\u65b0\u7684\u8de8\u7bc0\u9ede\u4e92\u9023\u74f6\u9838\u3002<\/p>\n<\/blockquote>\n<h2>\u5e38\u898b\u554f\u984c<\/h2>\n<h3>\u5982\u4f55\u5224\u65b7\u4f60\u7684\u5de5\u4f5c\u8ca0\u8f09\u662f\u5426\u53d7\u5230 NUMA \u5ef6\u9072\u5f71\u97ff\uff1f<\/h3>\n<p>\u5728\u7d42\u7aef\u6a5f\u4e2d\u57f7\u884c <code>numastat -c<\/code>\uff0c\u5373\u53ef\u67e5\u770b\u7cfb\u7d71\u8a18\u61b6\u9ad4\u914d\u7f6e\u8a08\u6578\u5668\u3002\u5982\u679c <code>other_node<\/code> \u6b04\u4f4d\u7684\u6578\u503c\u504f\u9ad8\uff0c\u8868\u793a\u5b58\u5728\u8de8\u63d2\u69fd\u8a18\u61b6\u9ad4\u5b58\u53d6\u3002<\/p>\n<pre><code>numastat -c<\/code><\/pre>\n<p>\u4f60\u4e5f\u53ef\u4ee5\u57f7\u884c <code>perf stat -e numa:numa_miss<\/code>\uff0c\u5728\u57f7\u884c\u671f\u9593\u5373\u6642\u6e2c\u91cf\u9060\u7aef\u8a18\u61b6\u9ad4\u5b58\u53d6\u4e8b\u4ef6\u3002<\/p>\n<h3>taskset \u548c numactl \u7684\u4e3b\u8981\u5dee\u7570\u662f\u4ec0\u9ebc\uff1f<\/h3>\n<p><code>taskset<\/code> \u5de5\u5177\u53ea\u8ca0\u8cac\u5c07\u57f7\u884c\u57f7\u884c\u7dd2\u7d81\u5b9a\u5230\u7279\u5b9a CPU \u6838\u5fc3\uff1b\u800c <code>numactl<\/code> \u5247\u80fd\u66f4\u6df1\u5165\u5730\u540c\u6642\u63a7\u5236 CPU \u89aa\u548c\u6027\u8207\u5be6\u9ad4 RAM \u7684\u7bc0\u9ede\u653e\u7f6e\u3002\u82e5\u8981\u5728\u56fa\u5b9a\u57f7\u884c\u4f4d\u7f6e\u7684\u540c\u6642\uff0c\u5f37\u5236\u5be6\u65bd\u672c\u5730\u914d\u7f6e\u6216\u4ea4\u932f\u914d\u7f6e\u7b56\u7565\uff0c\u61c9\u512a\u5148\u4f7f\u7528 <code>numactl<\/code>\u3002<\/p>\n<h3>\u5c0d\u65bc\u5373\u6642\u61c9\u7528\uff0c\u662f\u5426\u61c9\u8a72\u59cb\u7d42\u505c\u7528 AutoNUMA\uff1f<\/h3>\n<blockquote>\n<p><strong>\u95dc\u9375\u7d50\u8ad6\uff1a<\/strong> \u5373\u6642\u7cfb\u7d71\u8ffd\u6c42\u7684\u662f\u53ef\u9810\u6e2c\u6027\uff0c\u800c\u4e0d\u662f\u52d5\u614b\u5e73\u8861\u3002<\/p>\n<\/blockquote>\n<p>\u662f\u7684\uff0c\u5c0d\u65bc\u5373\u6642\u5de5\u4f5c\u8ca0\u8f09\uff0c\u61c9\u505c\u7528 AutoNUMA\u3002\u6838\u5fc3\u7684\u81ea\u52d5\u9801\u9762\u6383\u63cf\u6a5f\u5236\u6703\u5f15\u5165 CPU \u958b\u92b7\u8207\u4e0d\u53ef\u9810\u6e2c\u7684\u5ef6\u9072\u6296\u52d5\u3002\u63a1\u7528\u975c\u614b\u57f7\u884c\u7dd2\u7d81\u5b9a\u4e26\u642d\u914d\u660e\u78ba\u7b56\u7565\uff0c\u901a\u5e38\u80fd\u7372\u5f97\u66f4\u7a69\u5b9a\u4e00\u81f4\u7684\u5b58\u53d6\u5ef6\u9072\u3002<\/p>\n<h3>NUMA \u67b6\u69cb\u662f\u5426\u6703\u5f71\u97ff PCIe \u88dd\u7f6e\u8207 NVMe \u6548\u80fd\uff1f<\/h3>\n<p>PCIe \u63d2\u69fd\u901a\u5e38\u76f4\u63a5\u9023\u63a5\u5230\u7279\u5b9a\u8655\u7406\u5668\u63d2\u69fd\u3002\u7576\u57f7\u884c\u7dd2\u5b58\u53d6\u4f4d\u65bc\u9060\u7aef\u63d2\u69fd\u4e0a\u7684\u7db2\u8def\u4ecb\u9762\u5361\u6216 NVMe \u88dd\u7f6e\u6642\uff0cI\/O \u6d41\u91cf\u5fc5\u9808\u8de8\u8d8a\u63d2\u69fd\u9593\u4e92\u9023\u93c8\u8def\u3002\u8981\u6700\u4f73\u5316\u88dd\u7f6e\u541e\u5410\u91cf\uff0c\u61c9\u5c07 I\/O \u5bc6\u96c6\u578b\u57f7\u884c\u7dd2\u7d81\u5b9a\u5230\u627f\u8f09\u8a72 PCIe \u88dd\u7f6e\u7684\u672c\u5730\u63d2\u69fd\u4e0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>NUMA \u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072\uff0c\u662f\u6307\u8655\u7406\u5668\u5f9e DRAM \u8b80\u53d6\u8cc7\u6599\u6240\u8017\u8cbb\u7684\u6642\u9593\u3002\u672c\u5730\u63d2\u69fd\u7684\u8a18\u61b6\u9ad4\u8acb\u6c42\u901a\u5e38\u53ef\u5728 60 \u5230 [&#8230;]<\/p>\n<p><a class=\"btn btn-secondary understrap-read-more-link\" href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-to-optimize-memory-access-latency-in-numa-architecture\/\">Read More&#8230;<\/a><\/p>\n","protected":false},"author":12,"featured_media":34754,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[267],"tags":[],"class_list":["post-34757","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-tc"],"acf":[],"yoast_head":"<!-- This site is optimized with the 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\u67b6\u69cb\u4e2d\u7684\u8a18\u61b6\u9ad4\u5b58\u53d6\u5ef6\u9072\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/how-to-optimize-memory-access-latency-in-numa-architecture\/\" \/>\n<meta property=\"og:site_name\" content=\"Varidata Limited\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-03T08:58:57+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-03T09:05:45+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.varidata.com\/wp-content\/uploads\/2026\/08\/Screenshot-2026-08-03-165826.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"615\" \/>\n\t<meta property=\"og:image:height\" content=\"332\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<script type=\"application\/ld+json\" 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