{"id":81935,"date":"2026-07-25T05:26:45","date_gmt":"2026-07-24T21:26:45","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/81935.html"},"modified":"2026-07-25T05:26:45","modified_gmt":"2026-07-24T21:26:45","slug":"%e6%9c%8d%e5%8a%a1%e5%99%a8%e5%86%85%e5%ad%98%e8%a2%ab%e8%b0%81%e5%81%b7%e8%b5%b0%e4%ba%86%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/81935.html","title":{"rendered":"\u670d\u52a1\u5668\u5185\u5b58\u88ab\u8c01\u201c\u5077\u201d\u8d70\u4e86\uff1f"},"content":{"rendered":"<p>\u6570\u636e\u5e93\u670d\u52a1\u5668\u5185\u5b58\u7684\u9ad8\u4f7f\u7528\u7387\u4e00\u76f4\u56f0\u6270\u7740&#xff0c;\u660e\u660eused\u5185\u5b58\u4e0d\u9ad8&#xff0c;\u4f46\u662favailable\u53ef\u7528\u7684\u5185\u5b58\u5df2\u7ecf\u8fbe\u5230\u8b66\u6212\u7ebf&#xff0c;\u5f88\u5927\u4e00\u90e8\u5206\u53c8\u88abbuff\/cache\u5360\u7528&#xff0c;\u8fd9\u5176\u4e2d\u7a76\u7adf\u662f\u4ec0\u4e48\u5173\u7cfb&#xff1f;<\/p>\n<hr \/>\n<h5>1\u3001free\u547d\u4ee4\u4e0e\/proc\/meminfo\u7684\u6620\u5c04\u5173\u7cfb<\/h5>\n<p>\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u5e38\u7528TOP\u6216\u8005free\u547d\u4ee4\u67e5\u770b\u5f53\u524d\u7cfb\u7edf\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5&#xff0c;free\u547d\u4ee4\u7684\u8f93\u51fa\u7ed3\u679c\u5982\u4e0b\u6240\u793a&#xff0c;\u5305\u542bMem\u548cSwap\u4e24\u90e8\u5206&#xff0c;\u901a\u5e38\u5728\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d\u4f1a\u5173\u95edswap\u7a7a\u95f4\u3002<\/p>\n<p>              total        used        free      shared  buff\/cache   available<br \/>\nMem:     16310248     3223164     8006500    12348     5080584    11680584<br \/>\nSwap:       0           0     0<\/p>\n<p>\u5176\u4e2d\u5185\u5b58\u8ba1\u7b97\u516c\u5f0f&#xff1a;total &#061; used &#043; free &#043; buff\/cache&#xff0c;\u800cavailable\u4e3a\u4f30\u7b97\u503c\u3002<\/p>\n<ul>\n<li>total: \u7cfb\u7edf\u603b\u7269\u7406\u5185\u5b58<\/li>\n<li>free: \u5b8c\u5168\u672a\u88ab\u4f7f\u7528\u7684\u5185\u5b58<\/li>\n<li>used: \u5df2\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u3002\u8ba1\u7b97\u5f97\u51fa\u7684\u503c&#xff0c;used &#061; total &#8211; free &#8211; buff\/cache<\/li>\n<li>shared: \u88ab\u591a\u4e2a\u8fdb\u7a0b\u5171\u4eab\u7684\u5185\u5b58\u3002\u5176\u6570\u636e\u4e3b\u8981\u6765\u81ea\/proc\/meminfo\u4e2d\u7684Shmem\u5b57\u6bb5<\/li>\n<li>buff\/cache: \u5185\u6838\u7528\u4e8eI\/O\u4f18\u5316\u7684\u7f13\u51b2\u533a&#xff08;Buffers&#xff09;\u548c\u9875\u7f13\u5b58&#xff08;Page Cache&#xff09;\u7684\u603b\u548c<\/li>\n<li>available: \u9884\u4f30\u7684\u53ef\u4f9b\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u800c\u65e0\u9700\u8fdb\u884c\u4ea4\u6362\u7684\u5185\u5b58\u91cf<\/li>\n<\/ul>\n<p>\/proc\/meminfo\u6587\u4ef6\u5185\u5bb9\u793a\u4f8b\u5982\u4e0b&#xff08;\u6570\u503c\u5355\u4f4d\u4e3akB&#xff09;&#xff1a;<\/p>\n<p>MemTotal:       16310248 kB<br \/>\nMemFree:         8006500 kB<br \/>\nMemAvailable:   11680584 kB<br \/>\nBuffers:          347604 kB<br \/>\nCached:          3685460 kB<br \/>\nSwapCached:            0 kB<br \/>\n&#8230;<br \/>\nShmem:             12348 kB<br \/>\nSReclaimable:     210352 kB<br \/>\n&#8230;<\/p>\n<p>free\u547d\u4ee4Mem\u884c\u5404\u5217\u4e0e\/proc\/meminfo\u6307\u6807\u7684\u7cbe\u786e\u6620\u5c04\u5173\u7cfb\u5982\u4e0b\u6240\u793a&#xff1a;<\/p>\n<table>\n<tr>free\u547d\u4ee4\/proc\/meminfo\u5bf9\u5e94\u6307\u6807\/\u8ba1\u7b97\u516c\u5f0f\u89e3\u91ca<\/tr>\n<tbody>\n<tr>\n<td>total<\/td>\n<td>MemTotal<\/td>\n<td>\u7cfb\u7edf\u7684\u603b\u7269\u7406\u5185\u5b58\u5927\u5c0f\u3002<\/td>\n<\/tr>\n<tr>\n<td>used<\/td>\n<td>MemTotal &#8211; MemFree &#8211; Buffers &#8211; Cached<\/td>\n<td>\u88ab\u5e94\u7528\u7a0b\u5e8f\u548c\u90e8\u5206\u4e0d\u53ef\u56de\u6536\u7684\u5185\u6838\u7ed3\u6784\u5360\u7528\u7684\u5185\u5b58\u3002free\u547d\u4ee4\u672c\u8eab\u4e5f\u53ef\u4ee5\u901a\u8fc7\u5185\u90e8\u8ba1\u7b97 total &#8211; free &#8211; buff\/cache \u5f97\u51fa\u6b64\u503c\u3002<\/td>\n<\/tr>\n<tr>\n<td>free<\/td>\n<td>MemFree<\/td>\n<td>\u5b8c\u5168\u672a\u88ab\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u3002<\/td>\n<\/tr>\n<tr>\n<td>shared<\/td>\n<td>Shmem<\/td>\n<td>\u8fdb\u7a0b\u95f4\u5171\u4eab\u7684\u5185\u5b58\u603b\u91cf\u3002\u4e3b\u8981\u5305\u62ecSystem V\u5171\u4eab\u5185\u5b58\u3001POSIX\u5171\u4eab\u5185\u5b58\u4ee5\u53ca\u901a\u8fc7tmpfs\u5b9e\u73b0\u7684\u5171\u4eab\u533f\u540d\u6620\u5c04\u3002<\/td>\n<\/tr>\n<tr>\n<td>buff\/cache<\/td>\n<td>Buffers &#043; Cached &#043; SReclaimable<\/td>\n<td>\u7528\u4e8eI\/O\u4f18\u5316\u7684\u3001\u53ef\u88ab\u5185\u6838\u56de\u6536\u7684\u7f13\u5b58\u603b\u548c<\/td>\n<\/tr>\n<tr>\n<td>available<\/td>\n<td>MemAvailable<\/td>\n<td>\u4f30\u7b97\u7684\u3001\u53ef\u4f9b\u65b0\u5e94\u7528\u7a0b\u5e8f\u542f\u52a8\u800c\u4e0d\u4f1a\u5bfc\u81f4\u7cfb\u7edf\u4ea4\u6362&#xff08;swapping&#xff09;\u7684\u5185\u5b58\u91cf\u3002\u8861\u91cf\u7cfb\u7edf\u53ef\u7528\u5185\u5b58\u6700\u91cd\u8981\u7684\u6307\u6807\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h6>1.1 buff\/cache\u5185\u5b58\u5360\u7528\u5206\u6790<\/h6>\n<p>\u5728free\u547d\u4ee4\u7684\u8f93\u51fa\u4e2d&#xff0c;\u6709\u65f6\u5019\u770b\u5230buff\/cache\u5217\u7684\u6570\u503c\u975e\u5e38\u9ad8&#xff0c;\u8fd9\u90e8\u5206\u662f\u54ea\u4e00\u90e8\u5206\u5360\u7528\u7684&#xff1f;\u5148\u6765\u770b\u4e0bbuff\/cache\u90e8\u5206\u7684\u6784\u6210&#xff1a;buff\/cache\u662fLinux\u5185\u6838\u4e3a\u4e86\u63d0\u5347\u7cfb\u7edfI\/O\u6027\u80fd\u800c\u8bbe\u8ba1\u7684\u4e00\u5957\u6838\u5fc3\u7f13\u5b58\u673a\u5236\u7684\u603b\u79f0&#xff0c;\u5b83\u7531\u4e24\u90e8\u5206\u7ec4\u6210&#xff1a;Buffer Cache&#xff08;\u7f13\u51b2\u533a\u7f13\u5b58&#xff09;\u548cPage Cache&#xff08;\u9875\u7f13\u5b58&#xff09;&#xff1a;<\/p>\n<ul>\n<li>Page Cache(\u9875\u7f13\u5b58)&#xff1a;\u5f53\u5e94\u7528\u7a0b\u5e8f\u8bfb\u53d6\u6587\u4ef6\u65f6&#xff0c;\u5185\u6838\u4f1a\u9996\u5148\u68c0\u67e5\u6240\u9700\u6570\u636e\u662f\u5426\u5df2\u5b58\u5728\u4e8ePage Cache\u4e2d\u3002\u5982\u679c\u547d\u4e2d&#xff0c;\u5219\u76f4\u63a5\u4ece\u5185\u5b58\u8fd4\u56de\u6570\u636e&#xff0c;\u907f\u514d\u4e86\u78c1\u76d8I\/O\u64cd\u4f5c\u3002\u5982\u679c\u672a\u547d\u4e2d&#xff0c;\u5185\u6838\u4f1a\u4ece\u78c1\u76d8\u8bfb\u53d6\u6570\u636e&#xff0c;\u5e76\u5c06\u5176\u4e00\u4efd\u5b58\u5165Page Cache&#xff0c;\u4ee5\u5907\u540e\u7eed\u8bbf\u95ee\u3002\u540c\u6837&#xff0c;\u5f53\u5e94\u7528\u7a0b\u5e8f\u5199\u5165\u6587\u4ef6\u65f6&#xff0c;\u6570\u636e\u4e5f\u901a\u5e38\u5148\u88ab\u5199\u5165Page Cache&#xff0c;\u7136\u540e\u7531\u5185\u6838\u5728\u7a0d\u540e\u7684\u67d0\u4e2a\u65f6\u523b\u5f02\u6b65\u5730\u5199\u56de\u78c1\u76d8 \u3002<\/li>\n<li>Buffer Cache (\u7f13\u51b2\u533a\u7f13\u5b58)&#xff1a;\u4e3b\u8981\u7528\u4e8e\u7f13\u5b58\u5757\u8bbe\u5907&#xff08;\u5982\u78c1\u76d8&#xff09;\u7684\u5143\u6570\u636e&#xff08;\u5982\u6587\u4ef6\u7cfb\u7edf\u7684\u76ee\u5f55\u3001\u6743\u9650\u7b49&#xff09;&#xff0c;\u4ee5\u53ca\u5728\u5199\u64cd\u4f5c\u65f6\u805a\u5408\u5c0f\u7684\u5199\u8bf7\u6c42&#xff0c;\u4f18\u5316\u78c1\u76d8\u5199\u5165\u3002<\/li>\n<\/ul>\n<p>buff\/cache\u7684\u5360\u7528\u8005\u662f\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u672c\u8eab&#xff0c;\u5176\u76ee\u7684\u662f\u670d\u52a1\u4e8e\u6240\u6709\u8fdb\u7a0b\u7684\u6587\u4ef6I\/O\u8bf7\u6c42\u3002\u5982\u679cbuff\/cache\u5360\u7528\u9ad8&#xff0c;\u5e76\u4e0d\u4e00\u5b9a\u4ee3\u8868\u5185\u5b58\u4e0d\u8db3\u3002\u53ef\u80fd\u6709\u4ee5\u4e0b\u539f\u56e0&#xff1a;<\/p>\n<ul>\n<li>I\/O\u64cd\u4f5c&#xff1a;\u53ea\u8981\u7cfb\u7edf\u4e0a\u6709\u9891\u7e41\u7684\u6587\u4ef6\u8bfb\u5199\u64cd\u4f5c&#xff0c;\u4f8b\u5982\u7f16\u8bd1\u4ee3\u7801\u3001\u8fd0\u884c\u6570\u636e\u5e93\u3001\u542f\u52a8\u5e94\u7528\u7a0b\u5e8f\u3001\u751a\u81f3\u7b80\u5355\u7684ls\u547d\u4ee4&#xff0c;\u90fd\u4f1a\u5bfc\u81f4\u76f8\u5173\u6587\u4ef6\u6570\u636e\u548c\u5143\u6570\u636e\u88ab\u52a0\u8f7d\u5230buff\/cache\u4e2d\u3002<\/li>\n<li>\u5185\u6838\u7684\u7f13\u5b58\u7b56\u7565&#xff1a;\u5185\u6838\u4f1a\u4e3b\u52a8\u5229\u7528\u6240\u6709\u53ef\u7528\u7684\u7a7a\u95f2\u5185\u5b58\u8fdb\u884c\u7f13\u5b58\u3002\u4e00\u4e2a\u957f\u65f6\u95f4\u8fd0\u884c\u4e14I\/O\u5bc6\u96c6\u7684\u670d\u52a1&#xff0c;\u5176buff\/cache\u4f1a\u968f\u7740\u65f6\u95f4\u7684\u63a8\u79fb\u800c\u589e\u957f&#xff0c;\u76f4\u5230\u63a5\u8fd1\u7cfb\u7edf\u603b\u5185\u5b58\u7684\u67d0\u4e2a\u7a33\u5b9a\u6c34\u5e73\u3002<\/li>\n<li>\u5185\u5b58\u7684\u53ef\u56de\u6536\u6027&#xff1a;buff\/cache\u4e2d\u7684\u5927\u90e8\u5206\u5185\u5b58\u90fd\u88ab\u8ba4\u4e3a\u662f\u53ef\u56de\u6536\u7684&#xff08;Reclaimable&#xff09;\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u9700\u8981\u66f4\u591a\u5185\u5b58\u65f6&#xff0c;\u5982\u679c\u7a7a\u95f2\u5185\u5b58\u4e0d\u8db3&#xff0c;\u5185\u6838\u4f1a\u81ea\u52a8\u542f\u52a8\u5185\u5b58\u56de\u6536\u673a\u5236&#xff0c;\u4ecebuff\/cache\u4e2d\u201c\u9a71\u9010\u201d\u6389\u6700\u8fd1\u6700\u5c11\u4f7f\u7528\u7684\u7f13\u5b58\u9875&#xff0c;\u5c06\u8fd9\u90e8\u5206\u5185\u5b58\u91ca\u653e\u51fa\u6765\u5206\u914d\u7ed9\u5e94\u7528\u7a0b\u5e8f \u3002<\/li>\n<\/ul>\n<p>\u901a\u8fc7\u4ee5\u4e0b\u547d\u4ee4\u53ef\u67e5\u770b\u54ea\u4e9b\u6587\u4ef6\u88ab\u7f13\u5b58&#xff1a;<\/p>\n<p>lsof | grep -E &#034;REG.*(path_inode&#061;|\/.*)&#034; | awk &#039;{print $9}&#039; | sort | uniq -c | sort -rn | head -20<\/p>\n<p>\u5728\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d&#xff0c;redo\u3001binlog\u548crelaylog\u6587\u4ef6\u7684\u8bfb\u5199\u4f1a\u5360\u7528\u8f83\u591a\u7684page cache\u3002\u7531\u4e8eredo\u6587\u4ef6\u662f\u590d\u7528\u7684&#xff0c;\u56e0\u6b64\u4ea7\u751f\u7684page cache\u5360\u7528\u662f\u6709\u9650\u7684&#xff0c;\u800cbinlog\u7684\u5199\u5165\u662f\u589e\u91cf\u7684&#xff0c;\u968f\u7740\u65f6\u95f4\u63a8\u79fb\u4f1a\u6301\u7eed\u5360\u7528\u66f4\u591a\u7684page cache\u3002<\/p>\n<h6>1.2 Page Cache\u7684\u6e05\u7406\u673a\u5236<\/h6>\n<p>Buff\/cache\u652f\u6301\u624b\u52a8\u6e05\u7406\u7684\u65b9\u5f0f&#xff0c;\u4f46\u662f\u4e0d\u5efa\u8bae\u5728\u751f\u4ea7\u73af\u5883\u8fd9\u6837\u64cd\u4f5c\u3002\u901a\u8fc7\u5411\/proc\/sys\/vm\/drop_caches\u6587\u4ef6\u5199\u5165\u7279\u5b9a\u6570\u503c\u6765\u5b8c\u6210\u624b\u52a8\u6e05\u7406\u3002<\/p>\n<p>echo 1 &gt; \/proc\/sys\/vm\/drop_caches&#xff1a;\u6e05\u7406Page Cache\u3002<br \/>\necho 2 &gt; \/proc\/sys\/vm\/drop_caches&#xff1a;\u6e05\u7406dentries\u548cinodes&#xff08;\u5c5e\u4e8eSlab\u7684\u4e00\u90e8\u5206&#xff09;\u3002<br \/>\necho 3 &gt; \/proc\/sys\/vm\/drop_caches&#xff1a;\u6e05\u7406Page Cache\u3001dentries\u548cinodes\u3002<\/p>\n<p>\u6267\u884c\u6b64\u64cd\u4f5c\u540e&#xff0c;\u4f1a\u7acb\u5373\u770b\u5230free\u547d\u4ee4\u4e2dbuff\/cache\u503c\u5927\u5e45\u4e0b\u964d&#xff0c;free\u503c\u76f8\u5e94\u4e0a\u5347\u3002\u8fd9\u6837\u64cd\u4f5c\u4f1a\u5e26\u6765\u4e00\u5b9a\u7684\u6027\u80fd\u6296\u52a8&#xff0c;\u56e0\u4e3a\u4e0b\u4e00\u6b21\u5bf9\u76f8\u540c\u6587\u4ef6\u7684\u8bbf\u95ee\u5f97\u4ece\u78c1\u76d8\u4e2d\u91cd\u65b0\u8bfb\u53d6&#xff0c;\u7cfb\u7edf\u9700\u8981\u91cd\u65b0\u5efa\u7acb\u7f13\u5b58\u3002<\/p>\n<p>\u66f4\u591a\u7684\u662f\u5229\u7528\u7cfb\u7edf\u540e\u53f0\u56de\u6536\u7ebf\u7a0bkswapd&#xff0c;\u5b83\u4f1a\u5468\u671f\u6027\u5730\u68c0\u67e5\u5185\u5b58\u6c34\u4f4d\u3002\u5f53\u53ef\u7528\u5185\u5b58\u4e0b\u964d\u5230\u4f4e\u6c34\u4f4d\u7ebf\u4ee5\u4e0b\u65f6&#xff0c;kswapd\u4f1a\u88ab\u5524\u9192&#xff0c;\u5f00\u59cb\u5728\u540e\u53f0\u5f02\u6b65\u5730\u626b\u63cf\u548c\u56de\u6536\u4e0d\u6d3b\u8dc3\u7684\u5185\u5b58\u9875&#xff0c;\u76f4\u5230\u53ef\u7528\u5185\u5b58\u6062\u590d\u5230\u9ad8\u6c34\u4f4d\u7ebf\u4ee5\u4e0a\u3002\u5728\u7cfb\u7edf\u76d1\u63a7sar \u2013B\u5bf9\u5e94\u7684\u6307\u6807pgscank\u548cpgscand\u53ef\u4ee5\u770b\u5230page cache\u56de\u6536\u7684\u60c5\u51b5\u3002<\/p>\n<p>\u64cd\u4f5c\u7cfb\u7edf\u4e2d\u4e3a\u4e86\u8861\u91cf\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5&#xff0c;\u5b9a\u4e49\u4e86\u4e09\u4e2a\u5185\u5b58\u9608\u503c&#xff08;watermark&#xff0c;\u4e5f\u79f0\u4e3a\u6c34\u4f4d&#xff09;&#xff0c;\u5206\u522b\u662f watermark[min\/low\/high]&#xff1a;<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724212644-6a63d89467f02.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><\/p>\n<p>\u4e0a\u56fe\u57fa\u672c\u63ed\u793a\u4e86\u51e0\u4e2a\u6c34\u4f4d\u7684\u542b\u4e49&#xff0c;\u5f53MemFree\u4f4e\u4e8ewatermark[low]\u65f6&#xff0c;kswapd\u8fdb\u884c\u5185\u5b58\u56de\u6536&#xff0c;\u76f4\u5230\u7a7a\u95f2\u5185\u5b58\u8fbe\u5230watermark[high]\u540e\u505c\u6b62\u56de\u6536\u3002\u5982\u679c\u7533\u8bf7\u5185\u5b58\u7684\u901f\u5ea6\u592a\u5feb&#xff0c;\u5bfc\u81f4\u7a7a\u95f2\u5185\u5b58\u964d\u81f3watermark[min]\u540e&#xff0c;\u5185\u6838\u5c31\u4f1a\u8fdb\u884cdirect reclaim&#xff08;\u76f4\u63a5\u56de\u6536&#xff09;&#xff0c;\u7528\u56de\u6536\u4e0a\u6765\u7684\u7a7a\u95f2\u9875\u6ee1\u8db3\u5185\u5b58\u7533\u8bf7&#xff0c;\u8fd9\u6837\u4f1a\u963b\u585e\u5e94\u7528\u7a0b\u5e8f\u3002\u800cwatermark[min]\u7684\u5927\u5c0f\u7b49\u4e8e\u5185\u6838\u53c2\u6570min_free_kbytes\u7684\u503c&#xff0c;\u5176\u4ed6\u51e0\u4e2a\u6c34\u4f4d\u7684\u5173\u7cfb\u662f&#xff1a;<\/p>\n<p>watermark[low] &#061; watermark[min]*5\/4<br \/>\nwatermark[high] &#061; watermark[min]*3\/2<\/p>\n<p>\u5185\u6838\u53c2\u6570vm.min_free_kbytes\u4e3a\u5f3a\u5236Linux\u5185\u6838\u4fdd\u7559\u7684\u6700\u5c0f\u7a7a\u95f2\u5185\u5b58&#xff0c;\u5728\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d\u4e00\u822c\u4e3a\u5185\u5b58\u76845%\u5de6\u53f3\u3002vm.watermark_scale_factor\u63a7\u5236\u5185\u5b58\u6c34\u4f4d\u7ebf&#xff08;min,low,high&#xff09;\u4e4b\u95f4\u7684\u95f4\u8ddd&#xff0c;\u503c\u8d8a\u5927&#xff0c;kswapd\u7684\u6d3b\u52a8\u8303\u56f4\u8d8a\u5bbd&#xff0c;\u56de\u6536\u884c\u4e3a\u53ef\u80fd\u66f4\u5e73\u7f13\u4f46\u4e5f\u66f4\u9891\u7e41\u3002<\/p>\n<h6>1.3 Available\u53ef\u7528\u5185\u5b58\u7684\u4f30\u7b97<\/h6>\n<p>MemAvailable\u4e0d\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u7edf\u8ba1\u503c&#xff0c;\u800c\u662f\u5185\u6838\u4e3a\u4f30\u7b97\u5728\u4e0d\u89e6\u53d1\u78c1\u76d8I\/O\u4ea4\u6362\u7684\u60c5\u51b5\u4e0b&#xff0c;\u7cfb\u7edf\u8fd8\u80fd\u4e3a\u8fdb\u7a0b\u63d0\u4f9b\u591a\u5c11\u5185\u5b58\u800c\u8ba1\u7b97\u51fa\u7684\u4e00\u4e2a\u4f30\u7b97\u503c\u3002\u7b80\u5316\u540e\u7684\u4f30\u7b97\u516c\u5f0f\u5982\u4e0b&#xff1a;<\/p>\n<p>MemAvailable \u2248 MemFree &#8211; watermark[low] &#043; (PageCache &#8211; min(PageCache\/2, watermark[low]))<\/p>\n<ul>\n<li>watermark[low]\u7531\u4e0a\u8ff0\u516c\u5f0f\u53ef\u8ba1\u7b97\u5f97\u5230<\/li>\n<li>PageCache\u4e3b\u8981\u662f\/proc\/meminfo\u4e2d\u7684Active(file)\u4e0eInactive(file)\u4e4b\u548c&#xff0c;\u662f\u6587\u4ef6\u9875\u7f13\u5b58<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u6709\u65f6\u5019free\u547d\u4ee4\u770b\u5230\u7cfb\u7edf\u4e2dused\u5185\u5b58\u5e76\u4e0d\u9ad8&#xff0c;\u4f46\u662favailable\u53ef\u7528\u5185\u5b58\u5e76\u4e0d\u9ad8&#xff0c;\u5b9e\u9645\u4e0a\u5f88\u5927\u4e00\u90e8\u5206\u662f\u88abbuff\/cache\u5360\u7528\u4e86\u3002\u4ee58C32G\u7684gaussdb\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e3a\u4f8b&#xff1a;<\/p>\n<p>#\u901a\u8fc7free\u547d\u4ee4\u67e5\u770b\u5982\u4e0b&#xff1a;<br \/>\ntotal-32019200\u3001used-8868864\u3001free-3593280\u3001shared-8972224\u3001buff\/cache-19557056\u3001available-9466240<\/p>\n<p>#OS\u5c42\u5185\u6838\u53c2\u6570<br \/>\nvm.min_free_kbytes&#061;1594560<br \/>\nwatermark[low] &#061; 1594560*5\/4 &#061; 193200<\/p>\n<p>#\/proc\/meminfo\u4e2dpage_cache&#061;10584832<\/p>\n<p>#available\u53ef\u7528\u5185\u5b58\u4f30\u7b97\u5982\u4e0b<br \/>\nMemAvailable \u2248 MemFree &#8211; watermark[low] &#043; (PageCache &#8211; min(PageCache\/2, watermark[low]))<br \/>\n3593280 \u2013 1993200 &#043; (10584832 &#8211; 1993200) &#061; 10191712<\/p>\n<p>\u4f30\u7b97\u7684\u7ed3\u679c\u4e0efree\u770b\u5230\u7684\u7ed3\u679c\u57fa\u672c\u4e00\u81f4\u3002<\/p>\n<h5>2\u3001GoldenDB\u548cGaussDB\u6570\u636e\u5e93shared\u5185\u5b58\u5dee\u5f02<\/h5>\n<p>\u89c2\u5bdf\u5230\u5728\u4e0d\u540c\u6570\u636e\u5e93\u670d\u52a1\u5668&#xff08;MySQL\u7cfb\u5982GoldenDB\u548cGaussDB&#xff09;\u4e2d\u4f7f\u7528free\u547d\u4ee4\u67e5\u770b\u5185\u5b58\u4f7f\u7528\u65f6&#xff0c;\u53d1\u73b0\u867d\u7136\u90fd\u4f7f\u7528\u4e86\u6570\u636e\u5e93buffer\u7f13\u5b58\u7a7a\u95f4&#xff0c;\u4f46\u662ffree\u547d\u4ee4\u663e\u793a\u7684used\u548cshared\u5927\u5c0f\u5374\u5e76\u4e0d\u4e00\u6837\u3002\u6bd4\u5982GoldenDB\u4e2d&#xff0c;\u670d\u52a1\u5668\u5185\u5b58\u4e3a64G&#xff0c;\u6570\u636e\u5e93\u8fdb\u7a0b\u5185\u5b58\u5360\u752836g&#xff08;bufferpool\u8bbe\u7f6e\u4e3a24G&#xff09;&#xff0c;\u901a\u8fc7free\u770b\u5230used\u4e3a42G\u3001shared\u90e8\u5206\u4e3a3G&#xff0c;\u800cbuff\/cache\u90e8\u5206\u4e3a14G&#xff1b;\u5728GaussDB\u6570\u636e\u5e93\u4e2d&#xff0c;\u670d\u52a1\u5668\u5185\u5b58\u4e3a64g\u3001\u6570\u636e\u5e93\u8fdb\u7a0b\u5360\u752838G&#xff08;shared_buffer\u8bbe\u7f6e\u4e3a22G&#xff09;&#xff0c;free\u770b\u5230used\u4e3a22G\u3001shared\u4e3a24&#xff0c;buff\/cache\u90e8\u5206\u4e3a34G\u3002\u4e24\u79cd\u6570\u636e\u5e93\u4e2d\u4e3a\u4ec0\u4e48\u4f1a\u6709\u5dee\u5f02&#xff1f;<\/p>\n<h6>2.1 InnoDB\u7f13\u51b2\u6c60\u7684\u5185\u5b58\u673a\u5236<\/h6>\n<p>GoldenDB\u5b58\u50a8\u5f15\u64ce\u4e3aInnoDB&#xff0c;\u7f13\u51b2\u6c60\u7684\u5927\u5c0f\u7531innodb_buffer_pool_size\u53c2\u6570\u63a7\u5236\u3002InnoDB\u5728\u542f\u52a8\u65f6\u4f1a\u4e00\u6b21\u6027\u5206\u914d\u7f13\u51b2\u6c60\u6240\u9700\u7684\u5185\u5b58\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b&#xff0c;InnoDB\u4f1a\u901a\u8fc7\u6807\u51c6\u7684malloc()\u5e93\u51fd\u6570\u6765\u7533\u8bf7\u5185\u5b58\u3002malloc\u5728\u7533\u8bf7\u5927\u5757\u5185\u5b58\u65f6&#xff0c;\u5176\u5e95\u5c42\u901a\u5e38\u4f1a\u8c03\u7528mmap\u7cfb\u7edf\u8c03\u7528&#xff0c;\u5e76\u4f7f\u7528MAP_PRIVATE|MAP_ANONYMOUS\u6807\u5fd7\u3002\u56e0\u6b64\u5728\u9ed8\u8ba4\u914d\u7f6e\u4e0b\u9ed8\u8ba4\u914d\u7f6e\u4e0b\u7684InnoDB\u7f13\u51b2\u6c60\u662f\u4e00\u5757\u5de8\u5927\u7684\u79c1\u6709\u533f\u540d\u5185\u5b58&#xff0c;\u8fd9\u90e8\u5206\u5185\u5b58\u5c06\u88ab\u5185\u6838\u5f52\u7c7b\u4e3aAnonPages\u3002\u5b83\u5c5e\u4e8eMySQL\u8fdb\u7a0b\u7684\u79c1\u6709\u5730\u5740\u7a7a\u95f4&#xff0c;\u4e0d\u5c5e\u4e8eShmem&#xff0c;\u4e5f\u4e0d\u4f1a\u88ab\u8ba1\u5165free\u547d\u4ee4\u7684shared\u5217\u3002<\/p>\n<p>\u540c\u65f6&#xff0c;\u4e3a\u4e86\u907f\u514d\u6570\u636e\u5e93\u5c42\u548c\u64cd\u4f5c\u7cfb\u7edf\u5c42\u7684\u53cc\u91cd\u7f13\u5b58&#xff0c;InnoDB\u63d0\u4f9b\u4e86innodb_flush_method\u53c2\u6570\u3002\u751f\u4ea7\u73af\u5883\u8bbe\u7f6e\u4e3aO_DIRECT&#xff08;Direct I\/O&#xff09;&#xff0c;InnoDB\u5728\u8bfb\u5199\u5176\u6570\u636e\u6587\u4ef6&#xff08;.ibd\u6587\u4ef6&#xff09;\u65f6&#xff0c;\u4f1a\u901a\u77e5\u5185\u6838\u7ed5\u8fc7\u9875\u7f13\u5b58&#xff0c;\u76f4\u63a5\u5728InnoDB\u7f13\u51b2\u6c60\u548c\u7269\u7406\u78c1\u76d8\u4e4b\u95f4\u8fdb\u884c\u6570\u636e\u4f20\u8f93\u3002O_DIRECT\u53ea\u5bf9\u6570\u636e\u6587\u4ef6\u751f\u6548&#xff0c;\u5176\u4ed6\u6587\u4ef6\u5982\u4e8c\u8fdb\u5236\u65e5\u5fd7Binlog\u3001Relaylog\u4ee5\u53ca\u8868\u7ed3\u6784\u5b9a\u4e49\u6587\u4ef6\u7b49&#xff0c;\u4ecd\u7136\u4f7f\u7528\u6807\u51c6\u7684\u7f13\u51b2I\/O&#xff0c;\u56e0\u6b64\u5b83\u4eec\u7684\u5185\u5bb9\u8fd8\u662f\u4f1a\u88ab\u5185\u6838\u7f13\u5b58\u3002<\/p>\n<p>\u518d\u770bGoldenDB\u6570\u636e\u5e93\u8fdb\u7a0b&#xff0c;\u670d\u52a1\u5668\u5185\u5b58\u4e3a64G\u3001\u6570\u636e\u5e93\u8fdb\u7a0b\u5360\u752836G&#xff08;\u5176\u4e2dbufferpool\u4e3a24G&#xff09;&#xff0c;free\u547d\u4ee4\u770b\u5230used-42G\u3001shared-3G\u3001buff\/cache-14G\u3002<\/p>\n<ul>\n<li>InnoDB\u7f13\u51b2\u6c60\u768424GB\u662f\u901a\u8fc7malloc\u5206\u914d\u7684\u79c1\u6709\u533f\u540d\u5185\u5b58\u3002\u5b83\u4e0d\u5c5e\u4e8ebuff\/cache&#xff0c;\u8ba1\u5165used\u5185\u5b58\u90e8\u5206\u3002<\/li>\n<li>\u6570\u636e\u5e93\u8fdb\u7a0b\u603b\u5185\u5b58\u4e3a36GB&#xff0c;\u51cf\u53bb\u7f13\u51b2\u6c60\u768424GB&#xff0c;\u5269\u4e0b\u768412GB\u662fMySQL\u8fdb\u7a0b\u7684\u5176\u4ed6\u79c1\u6709\u5185\u5b58&#xff0c;\u5305\u62ec\u4f46\u4e0d\u9650\u4e8e&#xff1a;\u8fde\u63a5\u7ebf\u7a0b\u7684\u79c1\u6709\u5185\u5b58&#xff08;\u5982 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