{"id":24194,"date":"2025-09-01T15:04:36","date_gmt":"2025-09-01T07:04:36","guid":{"rendered":"https:\/\/www.varidata.com\/uncategorized-zh-tw\/how-to-test-memory-bandwidth-limits-on-hong-kong-servers\/"},"modified":"2025-09-01T15:12:22","modified_gmt":"2025-09-01T07:12:22","slug":"how-to-test-memory-bandwidth-limits-on-hong-kong-servers","status":"publish","type":"post","link":"https:\/\/www.varidata.com\/zh-tw\/knowledge-tc\/how-to-test-memory-bandwidth-limits-on-hong-kong-servers\/","title":{"rendered":"\u5982\u4f55\u6e2c\u8a66\u9999\u6e2f\u4f3a\u670d\u5668\u7684\u8a18\u61b6\u9ad4\u983b\u5bec\u9650\u5236"},"content":{"rendered":"<p>\u8a18\u61b6\u9ad4\u983b\u5bec\u6e2c\u8a66\u5c0d\u65bc\u6700\u4f73\u5316\u4f3a\u670d\u5668\u6548\u80fd\u81f3\u95dc\u91cd\u8981\uff0c\u5c24\u5176\u662f\u5728<a href=\"https:\/\/www.varidata.com\/zh-tw\/server\/hk\/cn2\/\" target=\"_blank\">\u9999\u6e2f\u4f3a\u670d\u5668\u79df\u7528<\/a>\u74b0\u5883\u4e2d\u3002\u672c\u7d9c\u5408\u6307\u5357\u63a2\u8a0e\u4e86\u6e2c\u8a66<a href=\"https:\/\/www.varidata.com\/zh-tw\/blog-tc\/why-hong-kong-server-bandwidth-becomes-the-top-choice\/\" target=\"_blank\">\u4f3a\u670d\u5668\u8a18\u61b6\u9ad4\u983b\u5bec<\/a>\u9650\u5236\u7684\u5c08\u696d\u65b9\u6cd5\u3001\u5fc5\u8981\u5de5\u5177\u548c\u6700\u4f73\u5316\u6280\u8853\uff0c\u4ee5\u5be6\u73fe\u6700\u4f73\u6548\u80fd\u3002\u4f5c\u70ba\u4e9e\u6d32\u4e3b\u8981\u91d1\u878d\u4e2d\u5fc3\uff0c\u9999\u6e2f\u5728\u9ad8\u983b\u4ea4\u6613\u3001\u5373\u6642\u5206\u6790\u548c\u4f01\u696d\u61c9\u7528\u65b9\u9762\u78ba\u4fdd\u6700\u4f73\u4f3a\u670d\u5668\u6548\u80fd\u5c0d\u4fdd\u6301\u7af6\u722d\u512a\u52e2\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h2><strong>\u6e2c\u8a66\u524d\u6e96\u5099\u548c\u8981\u6c42<\/strong><\/h2>\n<p>\u5728\u958b\u59cb\u8a18\u61b6\u9ad4\u983b\u5bec\u6e2c\u8a66\u4e4b\u524d\uff0c\u78ba\u4fdd\u6b63\u78ba\u8a2d\u5b9a\u5c0d\u65bc\u7372\u5f97\u6e96\u78ba\u7d50\u679c\u81f3\u95dc\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u6240\u9700\u5167\u5bb9\uff1a<\/p>\n<ul>\n<li>\u9999\u6e2f\u4f3a\u670d\u5668\u7684root\u5b58\u53d6\u6b0a\u9650<\/li>\n<li>\u4e7e\u6de8\u7684\u6e2c\u8a66\u74b0\u5883\uff08\u6700\u5c11\u7684\u80cc\u666f\u7a0b\u5e8f\uff09<\/li>\n<li>\u6700\u65b0\u7248\u672c\u7684\u6e2c\u8a66\u5de5\u5177<\/li>\n<li>\u7cfb\u7d71\u76e3\u63a7\u5de5\u5177<\/li>\n<li>\u6548\u80fd\u57fa\u6e96\u6587\u4ef6<\/li>\n<li>\u8a18\u61b6\u9ad4\u898f\u683c\u8a73\u60c5\uff08DDR4\/DDR5\u3001\u983b\u7387\u3001\u6642\u5e8f\uff09<\/li>\n<li>CPU\u62d3\u64b2\u8cc7\u8a0a\uff08\u6838\u5fc3\u6578\u91cf\u3001NUMA\u7bc0\u9ede\uff09<\/li>\n<li>\u6eab\u5ea6\u76e3\u63a7\u5de5\u5177\uff08\u5728\u9999\u6e2f\u6c23\u5019\u689d\u4ef6\u4e0b\u5c24\u70ba\u91cd\u8981\uff09<\/li>\n<\/ul>\n<h2><strong>\u6838\u5fc3\u6e2c\u8a66\u5de5\u5177\u6982\u8ff0<\/strong><\/h2>\n<p>\u70ba\u4e86\u9032\u884c\u5168\u9762\u7684\u8a18\u61b6\u9ad4\u983b\u5bec\u6e2c\u8a66\uff0c\u6211\u5011\u5c07\u91cd\u9ede\u95dc\u6ce8\u4e09\u500b\u4e3b\u8981\u5de5\u5177\uff0c\u6bcf\u500b\u5de5\u5177\u90fd\u670d\u52d9\u65bc\u7279\u5b9a\u7684\u6e2c\u8a66\u76ee\u7684\uff1a<\/p>\n<ul>\n<li>STREAM Benchmark:\n<ul>\n<li>\u8a18\u61b6\u9ad4\u983b\u5bec\u6e2c\u91cf\u7684\u7522\u696d\u6a19\u6e96<\/li>\n<li>\u63d0\u4f9b\u4e00\u81f4\u7684\u8de8\u5e73\u53f0\u7d50\u679c<\/li>\n<li>\u652f\u63f4\u591a\u57f7\u884c\u7dd2\u6e2c\u8a66\u5834\u666f<\/li>\n<li>\u975e\u5e38\u9069\u5408DDR4\/DDR5\u5c0d\u6bd4\u6e2c\u8a66<\/li>\n<\/ul>\n<\/li>\n<li>Intel\u8a18\u61b6\u9ad4\u5ef6\u9072\u6aa2\u67e5\u5668 (MLC):\n<ul>\n<li>\u8a73\u7d30\u7684\u8a18\u61b6\u9ad4\u5b50\u7cfb\u7d71\u5206\u6790<\/li>\n<li>\u5feb\u53d6\u5230\u8a18\u61b6\u9ad4\u50b3\u8f38\u6e2c\u91cf<\/li>\n<li>NUMA\u62d3\u64b2\u6e2c\u8a66\u529f\u80fd<\/li>\n<li>\u8a18\u61b6\u9ad4\u63a7\u5236\u5668\u6548\u80fd\u5206\u6790<\/li>\n<\/ul>\n<\/li>\n<li>Sysbench:\n<ul>\n<li>\u591a\u57f7\u884c\u7dd2\u57fa\u6e96\u6e2c\u8a66\u5957\u4ef6<\/li>\n<li>\u771f\u5be6\u5de5\u4f5c\u8ca0\u8f09\u6a21\u64ec<\/li>\n<li>\u8a18\u61b6\u9ad4\u5b58\u53d6\u6a21\u5f0f\u5206\u6790<\/li>\n<li>\u8207\u76e3\u63a7\u7cfb\u7d71\u6574\u5408<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u9010\u6b65\u6e2c\u8a66\u6d41\u7a0b<\/strong><\/h2>\n<p>\u8b93\u6211\u5011\u6df1\u5165\u4e86\u89e3\u4f7f\u7528\u6838\u5fc3\u5de5\u5177\u9032\u884c\u8a18\u61b6\u9ad4\u983b\u5bec\u6e2c\u8a66\u7684\u6280\u8853\u5be6\u73fe\uff0c\u4e26\u7279\u5225\u8003\u616e\u9999\u6e2f\u4f3a\u670d\u5668\u79df\u7528\u74b0\u5883\u7684\u7279\u9ede\u3002<\/p>\n<h3>1. STREAM Benchmark\u5be6\u65bd<\/h3>\n<p>STREAM benchmark\u63d0\u4f9b\u56db\u500b\u95dc\u9375\u7684\u5411\u91cf\u904b\u7b97\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4ee5\u6700\u4f73\u914d\u7f6e\u57f7\u884c\u5b83\u5011\uff1a<\/p>\n<ol>\n<li>\u4e0b\u8f09\u4e26\u4f7f\u7528\u6700\u4f73\u5316\u7de8\u8b6fSTREAM\uff1a\n<pre><code>wget http:\/\/www.cs.virginia.edu\/stream\/FTP\/Code\/stream.c\r\ngcc -O3 -march=native -fopenmp stream.c -o stream\r\n# \u91dd\u5c0dAMD EPYC\u8655\u7406\u5668\r\ngcc -O3 -march=znver2 -fopenmp stream.c -o stream<\/code><\/pre>\n<\/li>\n<li>\u8a2d\u5b9a\u6700\u4f73\u57f7\u884c\u7dd2\u74b0\u5883\u8b8a\u6578\uff1a\n<pre><code>export OMP_NUM_THREADS=`nproc`\r\nexport GOMP_CPU_AFFINITY=\"0-$((`nproc`-1))\"\r\n# \u91dd\u5c0dNUMA\u7cfb\u7d71\r\nexport OMP_PROC_BIND=spread\r\nexport OMP_PLACES=cores<\/code><\/pre>\n<\/li>\n<li>\u57f7\u884c\u591a\u6b21\u57fa\u6e96\u6e2c\u8a66\uff1a\n<pre><code>for i in {1..3}; do .\/stream; sleep 30; done<\/code><\/pre>\n<\/li>\n<\/ol>\n<h3>2. Intel MLC\u6e2c\u8a66<\/h3>\n<p>Intel MLC\u70ba\u8a18\u61b6\u9ad4\u5b50\u7cfb\u7d71\u6548\u80fd\u63d0\u4f9b\u66f4\u6df1\u5165\u7684\u898b\u89e3\uff0c\u9019\u5c0d\u9999\u6e2f\u7684\u9ad8\u983b\u4ea4\u6613\u7cfb\u7d71\u5c24\u70ba\u91cd\u8981\uff1a<\/p>\n<ul>\n<li>\u4e0d\u540c\u5b58\u53d6\u6a21\u5f0f\u7684\u983b\u5bec\u6e2c\u91cf\uff1a\n<pre><code>.\/mlc --max_bandwidth --loaded_latency --idle_latency\r\n.\/mlc --peak_injection_bandwidth<\/code><\/pre>\n<\/li>\n<li>\u5177\u6709NUMA\u611f\u77e5\u7684\u8a18\u61b6\u9ad4\u5ef6\u9072\u5206\u6790\uff1a\n<pre><code>.\/mlc --latency_matrix\r\n.\/mlc --c2c_latency<\/code><\/pre>\n<\/li>\n<li>\u5feb\u53d6\u5c64\u6b21\u7d50\u69cb\u6548\u80fd\u8a55\u4f30\uff1a\n<pre><code>.\/mlc --cache_line_size\r\n.\/mlc --memory_map<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2><strong>\u6e2c\u8a66\u7d50\u679c\u5206\u6790<\/strong><\/h2>\n<p>\u7406\u89e3\u6e2c\u8a66\u7d50\u679c\u9700\u8981\u4ed4\u7d30\u5206\u6790\u591a\u500b\u6307\u6a19\uff0c\u4e26\u8003\u616e\u9999\u6e2f\u7279\u5b9a\u7684\u5de5\u4f5c\u8ca0\u8f09\u6a21\u5f0f\uff1a<\/p>\n<ul>\n<li>\u8907\u88fd\u64cd\u4f5c\uff1a\u61c9\u9054\u5230\u7406\u8ad6\u983b\u5bec\u768475-85%\n<ul>\n<li>DDR4-3200\uff1a\u6bcf\u901a\u9053\u9810\u671f\u7d0445-50 GB\/s<\/li>\n<li>DDR5-4800\uff1a\u6bcf\u901a\u9053\u9810\u671f\u7d0470-75 GB\/s<\/li>\n<\/ul>\n<\/li>\n<li>\u7e2e\u653e\u64cd\u4f5c\uff1a\u901a\u5e38\u6bd4\u8907\u88fd\u64cd\u4f5c\u4f4e5-10%\n<ul>\n<li>\u76e3\u63a7\u6eab\u5ea6\u9650\u5236\u5f71\u97ff<\/li>\n<li>\u6aa2\u67e5NUMA\u5c40\u90e8\u6027\u6548\u61c9<\/li>\n<\/ul>\n<\/li>\n<li>\u52a0\u6cd5\u64cd\u4f5c\uff1a\u901a\u5e38\u6bd4\u8907\u88fd\u64cd\u4f5c\u4f4e10-15%\n<ul>\n<li>\u5c0d\u8cc7\u6599\u5eab\u5de5\u4f5c\u8ca0\u8f09\u81f3\u95dc\u91cd\u8981<\/li>\n<li>\u5c0d\u5373\u6642\u5206\u6790\u5f88\u91cd\u8981<\/li>\n<\/ul>\n<\/li>\n<li>Triad\u64cd\u4f5c\uff1a\u6700\u80fd\u4ee3\u8868\u5be6\u969b\u6548\u80fd\n<ul>\n<li>\u6574\u9ad4\u7cfb\u7d71\u8a55\u4f30\u7684\u95dc\u9375\u6307\u6a19<\/li>\n<li>\u6548\u80fd\u76e3\u63a7\u7684\u57fa\u6e96<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2><strong>\u6548\u80fd\u6700\u4f73\u5316\u6280\u8853<\/strong><\/h2>\n<p>\u57fa\u65bc\u6e2c\u8a66\u7d50\u679c\uff0c\u5be6\u65bd\u4ee5\u4e0b\u6700\u4f73\u5316\u7b56\u7565\uff0c\u9019\u4e9b\u7b56\u7565\u5c0d\u9999\u6e2f\u7684\u9ad8\u6548\u80fd\u904b\u7b97\u9700\u6c42\u5c24\u5176\u91cd\u8981\uff1a<\/p>\n<ol>\n<li>BIOS\u6700\u4f73\u5316\uff1a\n<ul>\n<li>\u70ba\u76f8\u5bb9\u8a18\u61b6\u9ad4\u555f\u7528XMP\u914d\u7f6e<\/li>\n<li>\u6700\u4f73\u5316\u8a18\u61b6\u9ad4\u6642\u5e8f\u8a2d\u5b9a\uff1a\n<ul>\n<li>tCL\uff08CAS\u5ef6\u9072\uff09<\/li>\n<li>tRCD\uff08RAS\u5230CAS\u5ef6\u9072\uff09<\/li>\n<li>tRP\uff08RAS\u9810\u5145\u96fb\uff09<\/li>\n<\/ul>\n<\/li>\n<li>\u914d\u7f6e\u9069\u7576\u7684NUMA\u8a2d\u5b9a\uff1a\n<ul>\n<li>\u7bc0\u9ede\u4ea4\u932f\u9078\u9805<\/li>\n<li>\u8a18\u61b6\u9ad4\u4ea4\u932f\u6df1\u5ea6<\/li>\n<\/ul>\n<\/li>\n<li>\u96fb\u6e90\u7ba1\u7406\u8a2d\u5b9a\uff1a\n<ul>\n<li>C-State\u63a7\u5236<\/li>\n<li>\u6548\u80fd\u72c0\u614b\u6700\u4f73\u5316<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4f5c\u696d\u7cfb\u7d71\u5c64\u7d1a\u8abf\u6821\uff1a\n<ul>\n<li>\u914d\u7f6e\u5927\u9801\u9762\uff1a\n<pre><code>echo always > \/sys\/kernel\/mm\/transparent_hugepage\/enabled\r\nsysctl -w vm.nr_hugepages=1024<\/code><\/pre>\n<\/li>\n<li>\u6700\u4f73\u5316\u7a0b\u5e8f\u6392\u7a0b\uff1a\n<pre><code>sysctl -w kernel.sched_min_granularity_ns=10000000\r\nsysctl -w kernel.sched_wakeup_granularity_ns=15000000<\/code><\/pre>\n<\/li>\n<li>\u8abf\u6574\u8a18\u61b6\u9ad4\u7ba1\u7406\u53c3\u6578\uff1a\n<pre><code>sysctl -w vm.swappiness=10\r\nsysctl -w vm.dirty_ratio=40<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h2><strong>\u5e38\u898b\u554f\u984c\u6392\u67e5<\/strong><\/h2>\n<p>\u5728\u9999\u6e2f\u4f3a\u670d\u5668\u4e0a\u6e2c\u8a66\u8a18\u61b6\u9ad4\u983b\u5bec\u6642\uff0c\u4f60\u53ef\u80fd\u6703\u9047\u5230\u9019\u4e9b\u6280\u8853\u6311\u6230\uff0c\u7279\u5225\u662f\u8003\u616e\u5230\u8a72\u5730\u5340\u7684\u74b0\u5883\u689d\u4ef6\uff1a<\/p>\n<ul>\n<li>\u7d50\u679c\u4e0d\u4e00\u81f4\uff1a\n<pre><code># \u6e05\u9664\u7cfb\u7d71\u5feb\u53d6\r\necho 3 > \/proc\/sys\/vm\/drop_caches\r\nsystemctl stop mysqld nginx\r\n# \u76e3\u63a7\u6eab\u5ea6\u72c0\u6cc1\r\nsensors | grep \"Core\"\r\n# \u6aa2\u67e5\u8a18\u61b6\u9ad4\u932f\u8aa4\r\nsudo dmidecode -t memory | grep -i error<\/code><\/pre>\n<\/li>\n<li>\u6548\u80fd\u964d\u7d1a\uff1a\n<pre><code># \u76e3\u63a7CPU\u983b\u7387\u8abf\u7bc0\r\ncat \/proc\/cpuinfo | grep \"MHz\"\r\nlscpu | grep \"MHz\"\r\n# \u6aa2\u67e5\u6eab\u5ea6\u9650\u5236\r\nturbostat --debug sleep 10\r\n# \u76e3\u63a7\u8a18\u61b6\u9ad4\u63a7\u5236\u5668\u72c0\u614b\r\nperf stat -e uncore_imc\/data_reads\/,uncore_imc\/data_writes\/ sleep 10<\/code><\/pre>\n<\/li>\n<\/ul>\n<h2><strong>\u9032\u968e\u6548\u80fd\u76e3\u63a7<\/strong><\/h2>\n<p>\u5be6\u65bd\u4ee5\u4e0b\u76e3\u63a7\u5be6\u52d9\u4ee5\u6301\u7e8c\u6700\u4f73\u5316\uff0c\u9019\u5c0d\u4fdd\u6301\u9999\u6e2f\u5feb\u7bc0\u594f\u5546\u696d\u74b0\u5883\u4e2d\u7684\u7af6\u722d\u512a\u52e2\u81f3\u95dc\u91cd\u8981\uff1a<\/p>\n<ol>\n<li>\u7cfb\u7d71\u6307\u6a19\u6536\u96c6\uff1a\n<ul>\n<li>\u8a18\u61b6\u9ad4\u983b\u5bec\u4f7f\u7528\u7387\u8ffd\u8e64\uff1a\n<pre><code>perf stat -e cpu\/event=0xbb,umask=0x1,name=DEMAND_DATA_RD\/ -a<\/code><\/pre>\n<\/li>\n<li>\u5feb\u53d6\u547d\u4e2d\/\u672a\u547d\u4e2d\u7387\u76e3\u63a7\uff1a\n<pre><code>perf stat -e cache-misses,cache-references,L1-dcache-loads,L1-dcache-load-misses -a<\/code><\/pre>\n<\/li>\n<li>\u8a18\u61b6\u9ad4\u63a7\u5236\u5668\u4f47\u5217\u6df1\u5ea6\u5206\u6790\uff1a\n<pre><code>perf stat -e uncore_imc\/cas_count_read\/,uncore_imc\/cas_count_write\/ -a<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u6548\u80fd\u57fa\u6e96\u5efa\u7acb\uff1a\n<pre><code># \u7d9c\u5408\u6548\u80fd\u57fa\u6e96\r\nperf stat -e cache-misses,cache-references,bus-cycles,instructions,cpu-cycles -a sleep 10\r\n# \u8a18\u61b6\u9ad4\u63a7\u5236\u5668\u7d71\u8a08\r\nperf stat -e uncore_imc_free_running\/data_reads\/,uncore_imc_free_running\/data_writes\/ sleep 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