{"id":209392,"date":"2025-09-30T09:09:37","date_gmt":"2025-09-30T01:09:37","guid":{"rendered":"https:\/\/www.server.hk\/blog\/209392\/"},"modified":"2025-09-30T09:09:38","modified_gmt":"2025-09-30T01:09:38","slug":"vps-260","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/209392\/","title":{"rendered":"\u9999\u6e2fVPS\u6027\u80fd\u4f18\u5316\uff1a\u7528 vmstat \u7cbe\u51c6\u8bca\u65ad\u4e0e\u4f18\u5316\u865a\u62df\u5185\u5b58\u74f6\u9888"},"content":{"rendered":"<p>\u5728\u9999\u6e2fVPS\u4e0a\u8fd0\u7ef4\u9ad8\u8d1f\u8f7d\u670d\u52a1\u65f6\uff0c\u865a\u62df\u5185\u5b58\uff08virtual memory\uff09\u76f8\u5173\u74f6\u9888\u7ecf\u5e38\u6210\u4e3a\u6027\u80fd\u4e0b\u964d\u7684\u6839\u6e90\u3002\u901a\u8fc7\u6b63\u786e\u7406\u89e3\u5e76\u4f7f\u7528 vmstat \u5de5\u5177\uff0c\u53ef\u4ee5\u5728\u4e0d\u76f2\u76ee\u6269\u5bb9\u7684\u524d\u63d0\u4e0b\uff0c\u7cbe\u51c6\u5b9a\u4f4d\u5185\u5b58\u3001swap \u4e0e I\/O \u7684\u74f6\u9888\uff0c\u4ece\u800c\u91c7\u53d6\u66f4\u6709\u6548\u7684\u4f18\u5316\u7b56\u7565\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u3001\u4f01\u4e1a\u7528\u6237\u4e0e\u5f00\u53d1\u8005\uff0c\u7ed3\u5408\u5b9e\u6218\u7ecf\u9a8c\u4e0e\u5185\u6838\u8c03\u4f18\u5efa\u8bae\uff0c\u8be6\u89e3\u5982\u4f55\u7528 vmstat \u8bca\u65ad\u5e76\u4f18\u5316\u9999\u6e2fVPS \u7684\u865a\u62df\u5185\u5b58\u95ee\u9898\uff0c\u5e76\u5728\u9002\u5f53\u5904\u6bd4\u8f83\u7f8e\u56fdVPS\u3001\u9999\u6e2f\u670d\u52a1\u5668\u4e0e\u7f8e\u56fd\u670d\u52a1\u5668 \u5728\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u9009\u62e9\u5dee\u5f02\u3002<\/p>\n<h2>\u4e3a\u4ec0\u4e48\u8981\u5173\u6ce8\u865a\u62df\u5185\u5b58\u4e0e vmstat<\/h2>\n<p>\u865a\u62df\u5185\u5b58\u673a\u5236\u4f7f\u5f97\u64cd\u4f5c\u7cfb\u7edf\u80fd\u591f\u7528\u6bd4\u7269\u7406\u5185\u5b58\u66f4\u5927\u7684\u5730\u5740\u7a7a\u95f4\u8fd0\u884c\u5e94\u7528\uff0c\u4f46\u5f53\u7269\u7406\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u7cfb\u7edf\u4f1a\u628a\u90e8\u5206\u5185\u5b58\u9875\u6362\u51fa\u5230 swap\uff0c\u4ece\u800c\u5bfc\u81f4\u660e\u663e\u7684\u6027\u80fd\u4e0b\u964d\u3002\u5bf9\u4e8e VPS \u73af\u5883\uff08\u65e0\u8bba\u662f\u9999\u6e2fVPS \u8fd8\u662f\u7f8e\u56fdVPS\uff09\uff0c\u5e95\u5c42\u8d44\u6e90\u5f80\u5f80\u5b58\u5728 <strong>\u8d85\u552e\uff08oversubscription\uff09<\/strong> \u6216 I\/O \u9694\u79bb\u5e26\u6765\u7684\u9650\u5236\uff0c\u56e0\u6b64\u53ca\u65f6\u8bc6\u522b\u662f\u5426\u56e0\u5185\u5b58\u538b\u529b\u89e6\u53d1 swap\u3001I\/O \u7b49\u5019\uff0c\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<p>vmstat \u662f\u4e00\u4e2a\u8f7b\u91cf\u7ea7\u5e76\u5b9e\u65f6\u7684\u8bca\u65ad\u5de5\u5177\uff0c\u80fd\u591f\u5c55\u793a\u8fdb\u7a0b\u5c31\u7eea\u6570\u3001\u5185\u5b58\u4f7f\u7528\u3001swap \u6d3b\u52a8\u3001\u78c1\u76d8 I\/O\u3001\u7cfb\u7edf\u8c03\u7528\u4ee5\u53ca CPU \u5229\u7528\u7b49\u6307\u6807\u3002\u901a\u8fc7\u5bf9\u8fd9\u4e9b\u6307\u6807\u7684\u7406\u89e3\uff0c\u53ef\u4ee5\u533a\u5206\u51fa\u201c\u5185\u5b58\u7d27\u5f20\u5bfc\u81f4\u7684 swap\u201d\u4e0e\u201c\u78c1\u76d8\u74f6\u9888\u6216 CPU \u9971\u548c\u5bfc\u81f4\u7684\u963b\u585e\u201d\u3002<\/p>\n<h2>vmstat \u7684\u4e3b\u8981\u5b57\u6bb5\u4e0e\u8bca\u65ad\u8981\u70b9<\/h2>\n<p>\u6267\u884c vmstat \u7684\u5178\u578b\u547d\u4ee4\uff1a<\/p>\n<ul>\n<li><code>vmstat 1 10<\/code>\uff08\u6bcf\u79d2\u91c7\u6837\u4e00\u6b21\uff0c\u8fde\u7eed\u5341\u6b21\uff09<\/li>\n<li><code>vmstat -SM 1<\/code>\uff08\u4ee5 MB \u4e3a\u5355\u4f4d\u663e\u793a\uff0c\u4fbf\u4e8e\u9605\u8bfb\uff09<\/li>\n<\/ul>\n<p>\u5173\u6ce8\u7684\u4e3b\u8981\u5217\uff1a<\/p>\n<ul>\n<li><strong>procs r b<\/strong>\uff1ar \u4e3a\u53ef\u8fd0\u884c\uff08run queue\uff09\u8fdb\u7a0b\u6570\uff0cb \u4e3a\u4e0d\u53ef\u4e2d\u65ad\u7761\u7720\uff08blocked\uff09\u3002\u6301\u7eed\u9ad8 r \u8868\u793a CPU \u6216 CPU \u7b49\u5f85\u8d44\u6e90\u4e0d\u8db3\uff0c\u9ad8 b \u591a\u4e0e I\/O \u74f6\u9888\u76f8\u5173\u3002<\/li>\n<li><strong>memory swpd free buff cache<\/strong>\uff1aswpd \u663e\u793a\u5f53\u524d\u5df2\u4f7f\u7528 swap \u5927\u5c0f\uff1bfree \u662f\u7a7a\u95f2\u5185\u5b58\uff1bbuff \u4e0e cache \u5206\u522b\u4e3a\u5185\u6838\u7f13\u51b2\u4e0e\u9875\u9762\u7f13\u5b58\u3002\u6ce8\u610f\u533a\u522b buff \u4e0e cache\uff0c\u5bf9\u4e8e\u6570\u636e\u5e93\u7c7b\u5e94\u7528\uff0cpage cache \u5bf9\u6027\u80fd\u5f71\u54cd\u5f88\u5927\u3002<\/li>\n<li><strong>swap si so<\/strong>\uff1asi \u4e3a\u4ece swap \u8bfb\u56de\u5185\u5b58\uff08swap in\uff09\uff0cso \u4e3a\u5199\u5230 swap\uff08swap out\uff09\u3002\u8f83\u9ad8\u7684 so \u5e38\u610f\u5473\u7740\u5185\u5b58\u56de\u6536\u538b\u529b\uff1b\u6301\u7eed\u7684 si\/so \u4f1a\u5bfc\u81f4\u54cd\u5e94\u5ef6\u8fdf\u3002<\/li>\n<li><strong>io bi bo<\/strong>\uff1a\u78c1\u76d8\u8bfb\u5199\u5757\u6570\uff08blocks in\/out\uff09\u3002\u5f53 so \u9ad8\u4e14 bo\/bi \u9ad8\u65f6\uff0c\u8bf4\u660e swap \u5bfc\u81f4\u5927\u91cf\u78c1\u76d8 I\/O\u3002<\/li>\n<li><strong>system in cs<\/strong>\uff1a\u4e2d\u65ad\u4e0e\u4e0a\u4e0b\u6587\u5207\u6362\u9891\u7387\u3002\u5f02\u5e38\u9ad8\u7684 cs \u53ef\u80fd\u56e0\u9891\u7e41\u7684\u8fdb\u7a0b\u5207\u6362\u6216\u4e2d\u65ad\u6296\u52a8\u3002<\/li>\n<li><strong>cpu us sy id wa st<\/strong>\uff1a\u7528\u6237\u6001\u3001\u5185\u6838\u6001\u3001\u7a7a\u95f2\u3001\u7b49\u5f85 I\/O\u3001\u88ab\u7a83\u53d6\uff08stolen\uff09CPU\u3002\u9ad8 wa \u8868\u793a\u7b49\u5f85 I\/O\uff0c\u9ad8 st \u5728 VPS \u73af\u5883\u4e0b\u8bf4\u660e\u5bbf\u4e3b\u673a\u4e0a\u88ab\u5206\u914d\u7684 CPU \u88ab\u5176\u4ed6\u865a\u62df\u673a\u201c\u7a83\u53d6\u201d\uff0c\u8fd9\u662f\u5224\u65ad\u662f\u5426\u906d\u9047\u201cnoisy neighbor\u201d\u7684\u5173\u952e\u7ebf\u7d22\u3002<\/li>\n<\/ul>\n<h3>\u5178\u578b\u95ee\u9898\u4e0e vmstat \u8f93\u51fa\u793a\u4f8b\u89e3\u6790<\/h3>\n<p>\u793a\u4f8b A\uff08\u5185\u5b58\u4e0d\u8db3\u5bfc\u81f4 swap\uff09\uff1a<\/p>\n<p><code>procs r b  0 1<br \/>\nmemory swpd free buff cache  10240  100  2048  512  5120<br \/>\nswap si so  0 512<br \/>\nio bi bo  0 1024<br \/>\ncpu us sy id wa st  10 2 5 83 0<\/code><\/p>\n<p>\u89e3\u8bfb\uff1aso \u5f88\u9ad8\uff0cswap \u5199\u9891\u7e41\uff0cbi\/bo \u9ad8\uff0ccpu wa \u6781\u9ad8\u3002\u8bf4\u660e\u7cfb\u7edf\u5728\u9891\u7e41\u628a\u9875\u9762\u5199\u5165 swap\uff0c\u4ece\u800c\u5f15\u8d77\u5927\u91cf\u78c1\u76d8 I\/O\uff0c\u8fdb\u800c\u5bfc\u81f4\u8fdb\u7a0b\u7b49\u5f85 I\/O\u3002\u89e3\u51b3\u65b9\u5411\u4f18\u5148\u4e3a\u51cf\u5c11 swap \u6216\u63d0\u5347 I\/O \u6027\u80fd\u3002<\/p>\n<p>\u793a\u4f8b B\uff08CPU \u88ab\u7a83\u53d6\uff09\uff1a<\/p>\n<p><code>procs r b  5 0<br \/>\nmemory swpd free buff cache  0 2048 1024 4096<br \/>\nswap si so  0 0<br \/>\nio bi bo  0 0<br \/>\ncpu us sy id wa st  20 5 10 0 65<\/code><\/p>\n<p>\u89e3\u8bfb\uff1a\u5927\u91cf st\uff08stolen\uff09\uff0c\u8bf4\u660e\u5bbf\u4e3b\u673a\u7684 CPU \u8d44\u6e90\u88ab\u5176\u4ed6 VM \u5360\u7528\u3002\u8fd9\u4e0d\u662f\u5185\u6838\u6216\u5e94\u7528\u5c42\u53ef\u4ee5\u5355\u7eaf\u89e3\u51b3\u7684\uff0c\u901a\u5e38\u9700\u8981\u4e0e VPS \u63d0\u4f9b\u5546\u534f\u5546\u6216\u5347\u7ea7\u4e3a\u6709\u4fdd\u8bc1 CPU \u7684\u65b9\u6848\u3002<\/p>\n<h2>\u9488\u5bf9\u9999\u6e2fVPS \u7684\u8bca\u65ad\u4e0e\u4f18\u5316\u7b56\u7565<\/h2>\n<p>\u5728\u9999\u6e2fVPS \u73af\u5883\u4e2d\u5e38\u89c1\u7684\u6027\u80fd\u75db\u70b9\u5305\u62ec\uff1a\u7269\u7406\u5185\u5b58\u4e0d\u8db3\u3001\u76d8\u578b\u4e3a\u5171\u4eab HDD \u6216\u975e\u672c\u5730\u5316 SSD\u3001\u5bbf\u4e3b\u673a\u8fc7\u8f7d\u7b49\u3002\u4e0b\u9762\u7ed9\u51fa\u9010\u9879\u4f18\u5316\u5efa\u8bae\uff0c\u6309\u201c\u68c0\u6d4b \u2192 \u4e34\u65f6\u7f13\u89e3 \u2192 \u957f\u671f\u4f18\u5316\u201d\u987a\u5e8f\u6574\u7406\u3002<\/p>\n<h3>\u5feb\u901f\u68c0\u6d4b\u6b65\u9aa4<\/h3>\n<ul>\n<li>\u8fd0\u884c <code>vmstat 1 20<\/code> \u89c2\u5bdf si\/so\u3001wa\u3001st\u3001r \u4e0e b \u7684\u957f\u671f\u8d8b\u52bf\u3002<\/li>\n<li>\u7ed3\u5408 <code>free -m<\/code>\u3001<code>top<\/code>\uff08\u6216 htop\uff09\u8bc6\u522b\u5360\u7528\u5185\u5b58\u4e0e\u865a\u62df\u5185\u5b58\u6700\u591a\u7684\u8fdb\u7a0b\u3002<\/li>\n<li>\u4f7f\u7528 <code>iostat -xz 1<\/code> \u6216 <code>iotop<\/code> \u68c0\u67e5\u78c1\u76d8 I\/O \u5229\u7528\u7387\u4e0e\u5ef6\u8fdf\u3002<\/li>\n<li>\u5728\u5bb9\u5668\u6216 cgroup \u73af\u5883\u4e2d\uff0c\u4f7f\u7528 <code>systemd-cgtop<\/code> \u6216 cgroup \u5de5\u5177\u67e5\u770b\u8d44\u6e90\u914d\u989d\u9650\u5236\u3002<\/li>\n<\/ul>\n<h3>\u4e34\u65f6\u7f13\u89e3\u63aa\u65bd\uff08\u65e0\u9700\u91cd\u542f\uff09<\/h3>\n<ul>\n<li>\u8c03\u6574 swappiness\uff1a<code>sysctl vm.swappiness=10<\/code>\uff08\u9ed8\u8ba4 60\uff09\uff0c\u5c06\u5185\u6838\u7f6e\u4e8e\u66f4\u4fdd\u5b88\u7684 swap \u4f7f\u7528\u7b56\u7565\uff0c\u51cf\u5c11\u9891\u7e41 swap out\u3002<\/li>\n<li>\u6e05\u7406\u7f13\u5b58\uff08\u8c28\u614e\uff09\uff1a<code>echo 3 &gt; \/proc\/sys\/vm\/drop_caches<\/code>\uff0c\u53ef\u7acb\u5373\u91ca\u653e page cache\uff0c\u4f46\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u9002\u7528\u4e8e\u77ed\u671f\u5185\u5b58\u4e0d\u8db3\u7684\u8bca\u65ad\u4e0e\u6062\u590d\u3002<\/li>\n<li>\u589e\u52a0 swap\uff08\u5982\u679c\u78c1\u76d8\u5ef6\u8fdf\u53ef\u63a5\u53d7\uff09\uff1a\u5728\u78c1\u76d8\u4e0a\u521b\u5efa\u4e00\u4e2a swapfile \u6765\u6682\u65f6\u7f13\u89e3\u5185\u5b58\u538b\u529b\uff1a<code>fallocate -l 4G \/swapfile; mkswap \/swapfile; swapon \/swapfile<\/code>\u3002<\/li>\n<li>\u8c03\u6574 OOM \u7b56\u7565\uff0c\u907f\u514d\u5173\u952e\u8fdb\u7a0b\u88ab\u6740\uff1a\u4f7f\u7528 <code>oom_score_adj<\/code> \u6216 systemd \u7684 OOM \u914d\u7f6e\u4fdd\u62a4\u5173\u952e\u670d\u52a1\u3002<\/li>\n<\/ul>\n<h3>\u957f\u671f\u4f18\u5316\u7b56\u7565<\/h3>\n<ul>\n<li>\u63d0\u5347\u5b9e\u4f8b\u89c4\u683c\uff1a\u5982\u679c vmstat \u663e\u793a\u6301\u7eed\u7684 swap \u4e0e\u9ad8 so\/si\uff0c\u5e94\u8003\u8651\u5347\u7ea7\u5185\u5b58\u6216\u9009\u62e9\u4fdd\u7559 CPU \u5957\u9910\u3002\u4e0e\u7f8e\u56fdVPS \u6216 \u9999\u6e2f\u670d\u52a1\u5668 \u8fdb\u884c\u6a2a\u5411\u6bd4\u8f83\u65f6\uff0c\u8bc4\u4f30\u5ef6\u8fdf\u4e0e\u5e26\u5bbd\u9700\u6c42\uff0c\u82e5\u7528\u6237\u7fa4\u5728\u7ca4\u6e2f\u6fb3\u53f0\uff0c\u9999\u6e2f\u670d\u52a1\u5668\u901a\u5e38\u5ef6\u8fdf\u66f4\u4f4e\u3002<\/li>\n<li>\u4f18\u5316\u5185\u6838\u53c2\u6570\uff1a\n<ul>\n<li>\u964d\u4f4e vm.swappiness\uff08\u4f8b\u5982 10 \u6216 1\uff09<\/li>\n<li>\u8c03\u6574 vm.vfs_cache_pressure\uff08\u63a7\u5236 inode\/dentry \u56de\u6536\uff0c\u9ed8\u8ba4 100\uff0c\u6570\u636e\u5e93\u53ef\u8bbe\u9ad8\u4e00\u4e9b\u6216\u4f4e\u4e00\u4e9b\u89c6\u573a\u666f\uff09<\/li>\n<li>\u8bbe\u7f6e vm.min_free_kbytes\uff0c\u786e\u4fdd\u5185\u6838\u7559\u8db3 \u201c\u4fdd\u7559\u5185\u5b58\u201d \u907f\u514d\u8fc7\u5ea6\u56de\u6536\u5bfc\u81f4\u6296\u52a8<\/li>\n<\/ul>\n<\/li>\n<li>\u542f\u7528 zswap \u6216 zram\uff1a\u5bf9\u5185\u5b58\u538b\u7f29\u80fd\u6709\u6548\u51cf\u5c11\u7269\u7406 swap \u5199\u5165\uff0c\u9002\u5408\u5185\u5b58\u5bf9 I\/O \u654f\u611f\u7684\u573a\u666f\uff08\u4f8b\u5982\u5c0f\u5185\u5b58\u6570\u636e\u5e93\u6216\u7f13\u5b58\u670d\u52a1\uff09\u3002<\/li>\n<li>\u4f7f\u7528 tmpfs \u5b58\u653e\u77ed\u671f\u4e34\u65f6\u6587\u4ef6\uff0c\u907f\u514d\u9891\u7e41\u5199\u5165\u78c1\u76d8 swap\uff1a<\/li>\n<li>\u5e94\u7528\u5c42\u9762\u4f18\u5316\uff1a\u9650\u5236 PHP\/Java \u7b49\u5806\u5185\u5b58\u3001\u4f18\u5316\u6570\u636e\u5e93\u7f13\u5b58\u7b56\u7565\uff08\u4f8b\u5982\u8c03\u6574 innodb_buffer_pool_size\uff09\uff0c\u4f7f\u7528\u5916\u90e8\u7f13\u5b58\uff08Redis\/Memcached\uff09\u6765\u964d\u4f4e\u5185\u5b58\u6296\u52a8\u3002<\/li>\n<li>\u5b58\u50a8\u5c42\u4f18\u5316\uff1a\u4f18\u5148\u9009\u62e9\u672c\u5730 SSD \u6216\u9ad8\u6027\u80fd\u4e91\u76d8\uff0c\u907f\u514d\u5171\u4eab HDD \u5bfc\u81f4\u7684\u9ad8 I\/O \u5ef6\u8fdf\u3002\u5728\u8de8\u533a\u90e8\u7f72\u65f6\uff0c\u6bd4\u8f83\u7f8e\u56fd\u670d\u52a1\u5668 \u4e0e \u9999\u6e2fVPS \u7684\u5b58\u50a8\u5ef6\u8fdf\u4e0e\u5e26\u5bbd\u5dee\u5f02\uff0c\u9488\u5bf9\u8bfb\u5199\u5bc6\u96c6\u578b\u5e94\u7528\u4f18\u5148\u672c\u5730\u5316\u5b58\u50a8\u3002<\/li>\n<li>\u90e8\u7f72\u76d1\u63a7\u4e0e\u62a5\u8b66\uff1a\u6301\u7eed\u91c7\u96c6 vmstat\u3001iostat \u4e0e top \u6570\u636e\uff0c\u8bbe\u7f6e\u9608\u503c\u62a5\u8b66\uff08\u5982 si\/so \u6301\u7eed &gt; 0.5 MB\/s \u6216 cpu wa &gt; 50%\uff09\u4ee5\u4fbf\u63d0\u524d\u5e72\u9884\u3002<\/li>\n<\/ul>\n<h2>\u5728\u4e0d\u540c\u573a\u666f\u4e0b\u7684\u9009\u62e9\u5bf9\u6bd4<\/h2>\n<p>\u4e0d\u540c\u4e1a\u52a1\u573a\u666f\u5bf9\u5185\u5b58\u4e0e I\/O \u7684\u9700\u6c42\u4e0d\u540c\uff0c\u56e0\u6b64\u5728\u9009\u62e9\u670d\u52a1\u5668\u6216 VPS \u65f6\u8981\u7ed3\u5408 vmstat \u7684\u8bca\u65ad\u7ed3\u679c\u4e0e\u4e1a\u52a1\u7279\u6027\uff1a<\/p>\n<h3>\u5c0f\u6d41\u91cf\u7f51\u7ad9 \/ \u9759\u6001\u5185\u5bb9<\/h3>\n<p>\u7f13\u5b58\u53cb\u597d\u3001I\/O \u9700\u6c42\u4f4e\u7684\u7ad9\u70b9\u53ef\u9009\u62e9\u8f7b\u91cf\u578b\u9999\u6e2fVPS \u6216\u7f8e\u56fdVPS\uff0c\u91cd\u70b9\u5173\u6ce8\u7f51\u7edc\u5e26\u5bbd\u4e0e\u5ef6\u8fdf\u3002\u5982\u679c\u7528\u6237\u4e3b\u8981\u5728\u7f8e\u6d32\uff0c\u9009\u62e9\u7f8e\u56fd\u670d\u52a1\u5668 \u53ef\u80fd\u5e26\u6765\u66f4\u597d\u4f53\u9a8c\u3002<\/p>\n<h3>\u6570\u636e\u5e93\u4e0e\u7f13\u5b58\u5bc6\u96c6\u578b\u5e94\u7528<\/h3>\n<p>\u9700\u8981\u7a33\u5b9a\u7684\u5185\u5b58\u4e0e\u4f4e\u5ef6\u8fdf\u5b58\u50a8\uff0c\u5efa\u8bae\u9009\u62e9\u5185\u5b58\u4e0e\u78c1\u76d8\u6027\u80fd\u6709\u4fdd\u8bc1\u7684\u5b9e\u4f8b\uff0c\u4f18\u5148\u914d\u7f6e\u5145\u8db3\u7269\u7406\u5185\u5b58\uff0c\u51cf\u5c11 swap \u4f7f\u7528\u3002\u4f7f\u7528 vmstat \u76d1\u6d4b\u662f\u5426\u5b58\u5728\u6301\u7eed swap \u6d3b\u52a8\uff0c\u4ee5\u51b3\u5b9a\u662f\u5426\u6269\u5bb9\u3002<\/p>\n<h3>\u9ad8\u5e76\u53d1\u77ed\u65f6\u7206\u53d1\u8d1f\u8f7d\uff08\u7535\u5546\u4fc3\u9500\u3001\u6d41\u5a92\u4f53\u7b49\uff09<\/h3>\n<p>\u8fd9\u7c7b\u573a\u666f\u5bf9 burst \u6027\u80fd\u4e0e I\/O \u6709\u8f83\u9ad8\u8981\u6c42\uff0c\u5e94\u9009\u62e9\u652f\u6301\u5f39\u6027\u6269\u5bb9\u6216\u5177\u6709\u4fdd\u8bc1 CPU \u7684\u65b9\u6848\uff0c\u4ee5\u907f\u514d\u5bbf\u4e3b\u673a\u62a2\u5360\uff08\u9ad8 st\uff09\u3002\u5728\u8de8\u533a\u57df\u90e8\u7f72\u65f6\uff0c\u8003\u8651\u5728\u9999\u6e2f\u4e0e\u7f8e\u56fd\u4e0d\u540c\u8282\u70b9\u505a\u8d1f\u8f7d\u5206\u5e03\u4ee5\u964d\u4f4e\u5ef6\u8fdf\u548c\u98ce\u9669\u3002<\/p>\n<h2>\u5e38\u89c1\u8bef\u533a\u4e0e\u6ce8\u610f\u4e8b\u9879<\/h2>\n<ul>\n<li>\u8bef\u533a\uff1aswap \u672c\u8eab\u5c31\u662f\u201c\u574f\u201d\u7684\u3002\u89e3\u91ca\uff1a\u9002\u91cf swap \u53ef\u4f5c\u4e3a\u5185\u5b58\u538b\u529b\u4e0b\u7684\u7f13\u51b2\uff0c\u4f46\u9891\u7e41\u7684 swap in\/out \u624d\u771f\u6b63\u5bfc\u81f4\u95ee\u9898\u3002<\/li>\n<li>\u8bef\u533a\uff1afree \u8f83\u4f4e\u5c31\u4e00\u5b9a\u4e0d\u884c\u3002\u89e3\u91ca\uff1aLinux \u4f1a\u5c3d\u53ef\u80fd\u4f7f\u7528\u5185\u5b58\u505a cache\uff0c\u770b\u5230 free \u5c11\u5e76\u4e0d\u603b\u662f\u574f\u4e8b\uff0c\u5e94\u7ed3\u5408 buff\/cache \u4e0e si\/so \u6765\u5224\u65ad\u3002<\/li>\n<li>\u6ce8\u610f\uff1a\u5728 VPS \u73af\u5883\u4e2d\u9047\u5230\u9ad8 stolen\uff08st\uff09\u65f6\uff0c\u4f18\u5316\u5e94\u7528\u65e0\u6d4e\u4e8e\u4e8b\uff0c\u9700\u8981\u4e0e\u670d\u52a1\u5546\u6c9f\u901a\u6216\u66f4\u6362\u66f4\u9ad8\u9636\u7684\u5b9e\u4f8b\u3002<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<p>\u901a\u8fc7 vmstat \u7684\u6301\u7eed\u76d1\u63a7\u4e0e\u6b63\u786e\u89e3\u8bfb\uff0c\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u9999\u6e2fVPS \u4e0a\u7684\u865a\u62df\u5185\u5b58\u74f6\u9888\uff0c\u533a\u5206\u662f\u5185\u5b58\u4e0d\u8db3\u5bfc\u81f4\u7684 swap\u3001\u78c1\u76d8 I\/O \u9650\u5236\uff0c\u8fd8\u662f\u5bbf\u4e3b\u673a\u8d44\u6e90\u4e89\u7528\u95ee\u9898\u3002\u5e94\u5148\u91c7\u7528\u975e\u7834\u574f\u6027\u7684\u4e34\u65f6\u63aa\u65bd\uff08\u5982\u8c03\u6574 swappiness\u3001\u542f\u7528 zswap\u3001\u6269\u5c55 swapfile\uff09\u6765\u7f13\u89e3\u7a81\u53d1\u538b\u529b\uff0c\u518d\u6839\u636e\u4e1a\u52a1\u7279\u6027\u505a\u957f\u671f\u4f18\u5316\uff08\u589e\u52a0\u5185\u5b58\u3001\u9009\u7528\u672c\u5730 SSD\u3001\u8c03\u6574\u5185\u6838\u53c2\u6570\u4e0e\u5e94\u7528\u5185\u5b58\u7b56\u7565\uff09\u3002\u5728\u533a\u57df\u9009\u62e9\u4e0a\uff0c\u82e5\u7528\u6237\u7fa4\u4f53\u548c\u4e1a\u52a1\u5ef6\u8fdf\u654f\u611f\uff0c\u9999\u6e2f\u670d\u52a1\u5668 \u5f80\u5f80\u80fd\u63d0\u4f9b\u8f83\u4f4e\u7684\u5ef6\u8fdf\uff1b\u82e5\u7528\u6237\u5728\u7f8e\u6d32\uff0c\u8003\u8651\u7f8e\u56fdVPS \u6216\u7f8e\u56fd\u670d\u52a1\u5668 \u66f4\u5408\u9002\u3002<\/p>\n<p>\u82e5\u60a8\u6b63\u5728\u8bc4\u4f30\u5347\u7ea7\u6216\u8d2d\u4e70\u66f4\u5408\u9002\u7684 VPS \u5b9e\u4f8b\u4ee5\u89e3\u51b3\u6301\u7eed\u7684\u5185\u5b58\u4e0e I\/O \u74f6\u9888\uff0c\u53ef\u4ee5\u53c2\u8003\u6211\u4eec\u63d0\u4f9b\u7684\u4e91\u670d\u52a1\u5668\u65b9\u6848\uff1a<a href=\"https:\/\/www.server.hk\/cloud.php\" target=\"_blank\" rel=\"noopener\">\u9999\u6e2fVPS \u4e0e\u4e91\u670d\u52a1\u5668\u4ea7\u54c1<\/a>\uff0c\u6839\u636e vmstat \u7684\u8bca\u65ad\u7ed3\u679c\u9009\u62e9\u5408\u9002\u7684\u5185\u5b58\u4e0e\u5b58\u50a8\u914d\u7f6e\uff0c\u6216\u8054\u7cfb\u8fd0\u7ef4\u652f\u6301\u8fdb\u884c\u8fdb\u4e00\u6b65\u4f18\u5316\u5efa\u8bae\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u9999\u6e2fVPS \u6027\u80fd\u4f18\u5316 \u4e2d\uff0c\u638c\u63e1 vmstat \u7684\u8f93\u51fa\u80fd\u8ba9\u4f60\u5feb\u901f\u8bc6\u522b\u865a\u62df\u5185\u5b58\u3001swap \u4e0e I\/O \u74f6\u9888\uff0c\u907f\u514d\u76f2\u76ee\u6269\u5bb9\u5e76\u7528\u66f4\u4f4e\u6210\u672c\u7684\u65b9\u5f0f\u63d0\u5347\u7a33\u5b9a\u6027\u4e0e\u54cd\u5e94\u901f\u5ea6\u3002\u672c\u6587\u9762\u5411\u7ad9\u957f\u4e0e\u5f00\u53d1\u8005\uff0c\u7ed3\u5408\u5b9e\u6218\u4e0e\u5185\u6838\u8c03\u4f18\u5efa\u8bae\uff0c\u6559\u4f60\u5982\u4f55\u7cbe\u51c6\u8bca\u65ad\u5e76\u89e3\u51b3\u865a\u62df\u5185\u5b58\u95ee\u9898\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4927],"tags":[2765,2764,2763,2761,289,2766,2762,107],"class_list":["post-209392","post","type-post","status-publish","format-standard","hentry","category-4927","tag-i-o","tag-linux","tag-swap","tag-vmstat","tag-vps","tag-2766"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/209392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=209392"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/209392\/revisions"}],"predecessor-version":[{"id":209393,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/209392\/revisions\/209393"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=209392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=209392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=209392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}