{"id":33843,"date":"2026-11-09T14:00:00","date_gmt":"2026-11-09T06:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=33843"},"modified":"2026-11-09T17:36:11","modified_gmt":"2026-11-09T09:36:11","slug":"server-memory-troubleshooting-free-vmstat","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/guides\/server-memory-troubleshooting-free-vmstat\/","title":{"rendered":"\u670d\u52a1\u5668\u5185\u5b58\u4e0d\u8db3\u6392\u67e5\uff1afree \u4e0e vmstat \u5224\u65ad\u771f\u5b9e\u5360\u7528\u5e76\u5b89\u5168\u6269\u5bb9"},"content":{"rendered":"

\"\u4e00\u53f0<\/p>\n

\u670d\u52a1\u5668\u534a\u591c\u91cd\u542f\u3001\u7f51\u7ad9\u95f4\u6b47\u6027\u5361\u987f\u3001\u65e5\u5fd7\u91cc\u5192\u51fa Out of memory \u62a5\u9519\u2014\u2014\u8fd9\u4e9b\u95ee\u9898\u5341\u6709\u516b\u4e5d\u6307\u5411\u5185\u5b58\u3002\u4f46\u771f\u6b63\u7740\u624b\u5904\u7406\u65f6\uff0c\u5f88\u591a\u4eba\u4f1a\u88ab\u4e00\u4e2a\u73b0\u8c61\u8bef\u5bfc\uff1afree -h<\/code> \u663e\u793a\u53ef\u7528\u5185\u5b58\u53ea\u5269\u51e0\u767e MB\uff0c\u4e8e\u662f\u7acb\u523b\u65ad\u5b9a”\u5185\u5b58\u4e0d\u591f\uff0c\u8be5\u5347\u914d\u4e86”\u3002\u5982\u4f55\u5224\u65ad\u670d\u52a1\u5668\u5185\u5b58\u662f\u4e0d\u662f\u771f\u7684\u4e0d\u591f\u3001\u74f6\u9888\u5230\u5e95\u5728\u54ea\u91cc\uff1f\u672c\u6587\u5e2e\u4f60\u89e3\u51b3\u8fd9\u4e2a\u6392\u67e5\u96be\u9898\uff1a\u5148\u5206\u6e05”\u771f\u5b9e\u5360\u7528”\u548c”\u7f13\u5b58\u5047\u8c61”\uff0c\u518d\u627e\u51fa\u5230\u5e95\u662f\u8c01\u5728\u5403\u5185\u5b58\uff0c\u6700\u540e\u624d\u8f6e\u5230\u6269\u5bb9\u51b3\u7b56\u3002\u6587\u7ae0\u6309\u8fd9\u4e09\u6b65\u5c55\u5f00\uff0c\u6bcf\u4e00\u6b65\u90fd\u7ed9\u51fa\u53ef\u4ee5\u76f4\u63a5\u6267\u884c\u7684\u547d\u4ee4\u548c\u5224\u65ad\u6807\u51c6\uff0c\u5e2e\u52a9\u4f60\u5728\u52a0\u94b1\u5347\u914d\u4e4b\u524d\u5148\u628a\u95ee\u9898\u770b\u6e05\u695a\u3002<\/p>\n

\u7b2c\u4e00\u6b65\uff1a\u7528 free \u533a\u5206\u771f\u5b9e\u5360\u7528\u4e0e\u7f13\u5b58\u5047\u8c61<\/h2>\n

Linux \u4f1a\u628a\u7a7a\u95f2\u5185\u5b58\u62ff\u6765\u505a\u78c1\u76d8\u7f13\u5b58\uff08page cache\uff09\u548c\u7f13\u51b2\u533a\uff0c\u8fd9\u90e8\u5206\u968f\u65f6\u53ef\u4ee5\u56de\u6536\uff0c\u6240\u4ee5”available”\u624d\u662f\u5224\u65ad\u5185\u5b58\u662f\u5426\u7d27\u5f20\u7684\u6b63\u786e\u6307\u6807\uff0c\u800c\u4e0d\u662f”free”\u3002\u770b\u4e00\u7ec4\u5178\u578b\u7684\u8f93\u51fa\uff1a<\/p>\n

free -h<\/code> \u663e\u793a total 7.6G\uff0cfree \u53ea\u6709 320M\uff0c\u4f46 available \u8fd8\u6709 5.1G\u2014\u2014\u8fd9\u53f0\u673a\u5668\u4e00\u70b9\u90fd\u4e0d\u7f3a\u5185\u5b58\uff0c\u5269\u4e0b\u7684\u662f\u7f13\u5b58\uff0c\u4e1a\u52a1\u9700\u8981\u65f6\u5185\u6838\u4f1a\u7acb\u5373\u91ca\u653e\u3002<\/p>\n

\u771f\u6b63\u9700\u8981\u8b66\u60d5\u7684\u4fe1\u53f7\u662f available \u957f\u671f\u4f4e\u4e8e\u603b\u5185\u5b58\u7684 10%\uff0c\u6216\u8005 swap\uff08\u4ea4\u6362\u5206\u533a\uff0c\u5185\u5b58\u4e0d\u591f\u65f6\u628a\u4e0d\u6d3b\u8dc3\u6570\u636e\u632a\u5230\u78c1\u76d8\u7684\u673a\u5236\uff09\u7684 used \u5217\u6301\u7eed\u589e\u957f\u3002swap used \u589e\u957f\u6bd4 available \u66f4\u5371\u9669\uff1a\u8bf4\u660e\u5185\u6838\u5df2\u7ecf\u5f00\u59cb\u628a\u5185\u5b58\u9875\u6362\u51fa\uff0c\u6b64\u65f6\u5e94\u7528\u54cd\u5e94\u5ef6\u8fdf\u4f1a\u660e\u663e\u6296\u52a8\uff0c\u6570\u636e\u5e93\u7c7b\u4e1a\u52a1\u6700\u5148\u53d7\u5f71\u54cd\u3002\u5224\u65ad\u89c4\u5219\u53ef\u4ee5\u8bb0\u6210\u4e00\u53e5\u8bdd\uff1aavailable \u4f4e\u4f46 swap \u7a33\u5b9a\u4e3a\u96f6\uff0c\u901a\u5e38\u53ea\u662f\u7f13\u5b58\u6c34\u4f4d\u9ad8\uff1bavailable \u4f4e\u4e14 swap \u5728\u6da8\uff0c\u624d\u662f\u771f\u7f3a\u5185\u5b58\u3002<\/p>\n

\u7b2c\u4e8c\u6b65\uff1a\u7528 vmstat \u770b\u5185\u5b58\u538b\u529b\u7684\u53d8\u5316\u8d8b\u52bf<\/h2>\n

free \u662f\u5feb\u7167\uff0cvmstat\uff08\u865a\u62df\u5185\u5b58\u7edf\u8ba1\u5de5\u5177\uff09\u80fd\u770b\u5230\u8d8b\u52bf\uff0c\u8fd9\u6b63\u662f\u6392\u67e5\u670d\u52a1\u5668\u5185\u5b58\u4e0d\u8db3\u65f6\u4e24\u8005\u7684\u5206\u5de5\u3002\u5173\u952e\u547d\u4ee4\uff1a<\/p>\n

vmstat 2 10<\/code> \u6bcf 2 \u79d2\u91c7\u6837\u4e00\u6b21\uff0c\u8fde\u7eed\u770b 20 \u79d2\u3002\u91cd\u70b9\u76ef\u4e09\u5217\uff1asi\uff08\u6362\u5165\uff09\u3001so\uff08\u6362\u51fa\uff09\u548c bo\uff08\u5757\u8f93\u51fa\uff09\u3002si\u3001so \u957f\u671f\u4e0d\u4e3a\u96f6\uff0c\u8bf4\u660e\u7cfb\u7edf\u5728\u9891\u7e41\u505a\u5185\u5b58\u4e0e\u78c1\u76d8\u4e4b\u95f4\u7684\u9875\u9762\u4ea4\u6362\uff0c\u8fd9\u662f\u5185\u5b58\u538b\u529b\u7684\u76f4\u63a5\u8bc1\u636e\uff1b\u6b64\u65f6 CPU \u7684 wa \u5217\uff08\u7b49\u5f85 I\/O \u65f6\u95f4\u5360\u6bd4\uff09\u5f80\u5f80\u540c\u6b65\u5347\u9ad8\uff0c\u5e94\u7528\u5361\u987f\u7684\u6839\u6e90\u5c31\u627e\u5230\u4e86\u3002<\/p>\n

\u4e3a\u4ec0\u4e48\u8981\u770b\u8d8b\u52bf\u800c\u4e0d\u662f\u5feb\u7167\uff1f\u56e0\u4e3a\u5185\u5b58\u6cc4\u6f0f\u7684\u5178\u578b\u5f62\u6001\u662f”\u7f13\u6162\u722c\u5347”\uff1a\u67d0\u5e94\u7528\u6bcf\u5c0f\u65f6\u6cc4\u6f0f\u51e0\u5341 MB\uff0cfree \u5feb\u7167\u770b\u4e0d\u51fa\u5f02\u5e38\uff0c\u4f46\u628a vmstat \u8f93\u51fa\u6309\u5c0f\u65f6\u5bf9\u6bd4\uff0csi\/so \u4f1a\u4ece\u5168\u96f6\u9010\u6e10\u53d8\u6210\u6301\u7eed\u975e\u96f6\u3002\u6211\u7684\u6d4b\u8bd5\u73af\u5883\u91cc\u66fe\u6709\u4e00\u53f0 8G \u5185\u5b58\u7684\u670d\u52a1\u5668\uff0c\u767d\u5929\u5404\u9879\u6307\u6807\u6b63\u5e38\uff0c\u51cc\u6668\u4e09\u70b9\u5b9a\u65f6\u4efb\u52a1\u89e6\u53d1\u4e00\u5904\u6cc4\u6f0f\u4ee3\u7801\u540e so \u5217\u7a81\u7136\u98d9\u5347\uff0c\u4e24\u5c0f\u65f6\u5185 4G \u6570\u636e\u88ab\u6362\u5230\u78c1\u76d8\uff0c\u7f51\u7ad9\u54cd\u5e94\u4ece 80ms \u6389\u5230 2 \u79d2\u2014\u2014\u8fd9\u4e2a\u6a21\u5f0f\u53ea\u6709\u8d8b\u52bf\u6570\u636e\u80fd\u66b4\u9732\u3002\u7c7b\u4f3c\u8fd9\u79cd”\u767d\u5929\u6b63\u5e38\u3001\u591c\u95f4\u52a3\u5316”\u7684\u73b0\u8c61\uff0c\u5f88\u591a\u65f6\u5019\u5e76\u975e\u5185\u5b58\u72ec\u6709\u95ee\u9898\uff0c\u4e5f\u53ef\u80fd\u4e0e\u5171\u4eab\u8d44\u6e90\u4e89\u62a2\u6709\u5173\uff0c\u53ef\u4ee5\u7ed3\u5408\u5f71\u54cd VPS \u901f\u5ea6\u7684\u6838\u5fc3\u56e0\u7d20<\/a>\u4e00\u8d77\u5206\u6790\uff0c\u628a CPU\u3001I\/O \u548c\u5185\u5b58\u4e09\u6761\u7ebf\u5206\u5f00\u9a8c\u8bc1\u3002<\/p>\n

\"\u5185\u5b58\u9875\u4e0e\u78c1\u76d8\u4e4b\u95f4\u53cc\u5411\u4ea4\u6362\u5f62\u6210<\/p>\n

\u7b2c\u4e09\u6b65\uff1a\u627e\u51fa\u5230\u5e95\u662f\u8c01\u5728\u5403\u5185\u5b58<\/h2>\n

\u786e\u8ba4\u5b58\u5728\u771f\u5b9e\u5185\u5b58\u538b\u529b\u540e\uff0c\u4e0b\u4e00\u6b65\u662f\u5b9a\u4f4d\u5177\u4f53\u8fdb\u7a0b\uff0c\u5426\u5219\u6269\u5bb9\u53ea\u662f\u628a\u95ee\u9898\u63a8\u8fdf\u3002<\/p>\n

\"\u4ece\u7cfb\u7edf\u5185\u5b58\u6761\u4e2d\u9010\u5c42\u5b9a\u4f4d\u5360\u7528\u8fdb\u7a0b\u7684\u6392\u67e5\u5c42\u6b21\u793a\u610f\u63d2\u56fe\"<\/p>\n

\u6309\u987a\u5e8f\u7528\u4e09\u6761\u547d\u4ee4\u6392\u67e5\u3002\u5148\u770b\u603b\u91cf\u6392\u884c\uff1aps aux --sort=-%mem | head -10<\/code> \u5217\u51fa\u5403\u5185\u5b58\u6700\u591a\u7684 10 \u4e2a\u8fdb\u7a0b\uff0c\u591a\u6570\u60c5\u51b5\u5230\u6b64\u5c31\u80fd\u9501\u5b9a\u5143\u51f6\u3002\u82e5\u6000\u7591\u6cc4\u6f0f\uff0c\u518d\u5bf9\u6bd4\u8be5\u8fdb\u7a0b\u5f53\u524d RSS\uff08\u5e38\u9a7b\u5185\u5b58\u96c6\uff0c\u8fdb\u7a0b\u5b9e\u9645\u5360\u7528\u7684\u7269\u7406\u5185\u5b58\uff09\u4e0e\u521a\u542f\u52a8\u65f6\u7684\u6570\u503c\uff0c24 \u5c0f\u65f6\u5185\u5355\u8c03\u589e\u957f\u4e14\u4e0d\u56de\u843d\uff0c\u57fa\u672c\u53ef\u4ee5\u786e\u8ba4\u6cc4\u6f0f\u3002\u6700\u540e\u67e5 OOM\uff08Out of Memory\uff0c\u5185\u6838\u5185\u5b58\u8017\u5c3d\u4fdd\u62a4\u673a\u5236\uff09\u7684\u5386\u53f2\u8bb0\u5f55\uff1admesg -T | grep -i \"out of memory\"<\/code> \u6216 journalctl -k --since \"24 hours ago\" | grep -i oom<\/code><\/p>\n

OOM killer \u7684\u65e5\u5fd7\u4f1a\u660e\u786e\u5199\u51fa”\u54ea\u4e2a\u8fdb\u7a0b\u3001\u4f55\u65f6\u3001\u88ab\u6740\u6389\u4e86\u591a\u5c11\u5185\u5b58”\u3002\u5f88\u591a”\u670d\u52a1\u5668\u534a\u591c\u81ea\u5df1\u91cd\u542f”\u7684\u6848\u4f8b\uff0c\u771f\u76f8\u5c31\u662f\u67d0\u4e2a\u8fdb\u7a0b\u5185\u5b58\u5931\u63a7\u540e\u89e6\u53d1 OOM\uff0c\u4e14\u88ab\u6740\u7684\u6070\u597d\u662f\u6570\u636e\u5e93\u6216 PHP-FPM \u8fd9\u7c7b\u6838\u5fc3\u670d\u52a1\u3002\u65e5\u5fd7\u91cc\u5982\u679c\u9891\u7e41\u51fa\u73b0\u540c\u4e00\u4e2a\u8fdb\u7a0b\u540d\uff0c\u5373\u4f7f\u5f53\u524d\u5185\u5b58\u591f\u7528\uff0c\u4e5f\u5e94\u5c3d\u5feb\u4fee\u590d\u6216\u9650\u5236\u8be5\u8fdb\u7a0b\uff0c\u6bd4\u5982\u7528 systemd \u7684 MemoryMax \u7ed9\u5b83\u8bbe\u4e0a\u9650\uff0c\u9632\u6b62\u5b83\u518d\u6b21\u62d6\u57ae\u6574\u53f0\u673a\u5668\u3002\u6570\u636e\u5e93\u7c7b\u4e1a\u52a1\u7684\u5185\u5b58\u53c2\u6570\u600e\u4e48\u914d\uff0c\u53ef\u4ee5\u53c2\u8003\u8fd9\u7bc7\u670d\u52a1\u5668\u914d\u7f6e\u4e0e\u6027\u80fd\u4f18\u5316<\/a>\u7684\u5206\u7c7b\u6587\u7ae0\uff0c\u628a buffer pool \u548c\u8fde\u63a5\u6570\u4e0a\u9650\u4e00\u8d77\u7eb3\u5165\u68c0\u67e5\u3002<\/p>\n

\u7b2c\u56db\u6b65\uff1a\u6269\u5bb9\u51b3\u7b56\u8981\u5148\u7528\u538b\u6d4b\u9a8c\u8bc1<\/h2>\n

\u524d\u4e09\u6b65\u505a\u5b8c\uff0c\u5982\u679c\u786e\u8ba4\u662f\u4e1a\u52a1\u589e\u957f\u5e26\u6765\u7684\u771f\u5b9e\u5185\u5b58\u7f3a\u53e3\uff08\u800c\u4e0d\u662f\u6cc4\u6f0f\u6216\u914d\u7f6e\u95ee\u9898\uff09\uff0c\u624d\u8fdb\u5165\u6269\u5bb9\u73af\u8282\u3002\u8fd9\u91cc\u6700\u5e38\u89c1\u7684\u5931\u8bef\u662f”\u76f4\u63a5\u4e70\u66f4\u5927\u7684\u914d\u7f6e”\uff0c\u7ed3\u679c\u65b0\u673a\u5668\u4e0a\u7ebf\u540e\u8001\u95ee\u9898\u4f9d\u65e7\u2014\u2014\u56e0\u4e3a\u74f6\u9888\u53ef\u80fd\u662f swap \u914d\u7f6e\u4e0d\u5f53\u6216\u5e94\u7528\u5185\u5b58\u53c2\u6570\u6ca1\u8c03\u3002<\/p>\n

\u6b63\u786e\u7684\u987a\u5e8f\u662f\u5148\u505a\u4e00\u6b21\u538b\u6d4b\uff0c\u6a21\u62df\u4e1a\u52a1\u9ad8\u5cf0\u7684\u5185\u5b58\u6c34\u4f4d\u3002\u6bd4\u5982 WordPress \u7ad9\u53ef\u4ee5\u7528 ab -n 2000 -c 50<\/code> \u8fd9\u7c7b\u5de5\u5177\u538b\u4e00\u8f6e\uff0c\u540c\u65f6\u5f00\u7740 vmstat 2<\/code> \u89c2\u5bdf si\/so\uff1a\u5982\u679c\u5e76\u53d1 50 \u65f6 swap \u5f00\u59cb\u589e\u957f\uff0c\u8bf4\u660e\u5f53\u524d\u914d\u7f6e\u6491\u4e0d\u4f4f\u5cf0\u503c\uff0c\u6269\u5bb9\u76ee\u6807\u5c31\u662f\u8ba9\u5cf0\u503c\u5e76\u53d1\u4e0b si\/so \u4fdd\u6301\u4e3a\u96f6\u5e76\u7559\u51fa 20% \u4ee5\u4e0a\u7684 available \u4f59\u91cf\u3002\u518d\u6838\u5bf9\u5e94\u7528\u4fa7\u53c2\u6570\uff1aPHP-FPM \u7684 pm.max_children\uff08\u6700\u5927\u5b50\u8fdb\u7a0b\u6570\uff09\u4e58\u4ee5\u5355\u8fdb\u7a0b\u5e73\u5747\u5185\u5b58\uff0cMySQL \u7684 innodb_buffer_pool_size\uff08InnoDB \u7f13\u51b2\u6c60\u5927\u5c0f\uff09\uff0c\u8fd9\u4e9b\u53c2\u6570\u4e0d\u5339\u914d\u65f6\uff0c\u5347\u914d\u7684\u94b1\u4f1a\u5927\u91cf\u6d6a\u8d39\u5728\u95f2\u7f6e\u5185\u5b58\u4e0a\u3002<\/p>\n

\u603b\u7ed3\u4e0e\u884c\u52a8\u5efa\u8bae<\/h2>\n

\u670d\u52a1\u5668\u5185\u5b58\u4e0d\u8db3\u7684\u6392\u67e5\u53ef\u4ee5\u6536\u62e2\u6210\u4e00\u6761\u94fe\u8def\uff1afree \u770b available \u786e\u8ba4\u771f\u5047\u7d27\u5f20\uff0cvmstat \u770b si\/so \u786e\u8ba4\u538b\u529b\u8d8b\u52bf\uff0cps \u548c OOM \u65e5\u5fd7\u5b9a\u4f4d\u5177\u4f53\u8fdb\u7a0b\uff0c\u538b\u6d4b\u9a8c\u8bc1\u540e\u624d\u505a\u6269\u5bb9\u51b3\u7b56\u3002\u56db\u6b65\u8d70\u5b8c\uff0c\u7edd\u5927\u591a\u6570”\u5185\u5b58\u4e0d\u8db3”\u90fd\u80fd\u627e\u5230\u786e\u5207\u539f\u56e0\uff0c\u800c\u4e0d\u662f\u9760\u91cd\u542f\u7eed\u547d\u3002<\/p>\n

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