{"id":5107,"date":"2020-09-20T19:04:37","date_gmt":"2020-09-20T11:04:37","guid":{"rendered":"https:\/\/www.xttblog.com\/?p=5107"},"modified":"2020-09-20T19:04:37","modified_gmt":"2020-09-20T11:04:37","slug":"%e8%ae%b0%e4%b8%80%e6%ac%a1%e7%94%9f%e4%ba%a7%e6%9c%8d%e5%8a%a1%e5%99%a8java%e8%bf%9b%e7%a8%8b%e7%aa%81%e7%84%b6%e6%b6%88%e5%a4%b1%e9%97%ae%e9%a2%98%e6%8e%92%e6%9f%a5%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=5107","title":{"rendered":"\u8bb0\u4e00\u6b21\u751f\u4ea7\u670d\u52a1\u5668Java\u8fdb\u7a0b\u7a81\u7136\u6d88\u5931\u95ee\u9898\u6392\u67e5\uff01"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u524d\u8a00<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f88\u65e9\u90fd\u60f3\u5199\u8fd9\u7bc7\u6587\u7ae0\u4e86\uff0c\u4e00\u76f4\u8feb\u4e8e\u65f6\u95f4\u4e0a\u7684\u7ea6\u675f\uff0c\u62d6\u5230\u4e86\u4eca\u5929\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4ef6\u4e8b\u662f\u771f\u5b9e\u7684\u53d1\u9001\u5728\u6211\u4eec\u7684\u751f\u4ea7\u73af\u5883\u4e0a\uff0c\u5176\u4e2d\u7684\u4e00\u53f0\u670d\u52a1\u5668\u4e0a\u8dd1\u7740 4 \u4e2a jar \u7a0b\u5e8f\uff0c\u9694\u4e09\u5dee\u4e94\u7684\u4f1a\u53d1\u9001\u8fdb\u7a0b\u7a81\u7136\u6d88\u5931\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u867d\u7136\uff0c\u8fd9\u4e2a\u670d\u52a1\u5668\u4e0a\u8dd1\u7684 java \u7a0b\u5e8f\u4e0d\u662f\u7279\u522b\u7684\u91cd\u8981\uff0c\u4f46\u662f\u4f5c\u4e3a\u4e00\u4e2a\u7a0b\u5e8f\u5458\uff0c\u6211\u4eec\u4e0d\u80fd\u8ba9\u7a0b\u5e8f\u6b7b\u7684\u4e0d\u660e\u4e0d\u767d\uff0c\u5fc5\u987b\u627e\u5230\u5176\u4e2d\u7684\u539f\u56e0\u3002\u672c\u6587\u4fbf\u662f\u8bb0\u5f55\u4e00\u4e0b\u8fd9\u4e2a\u95ee\u9898\u4ea7\u751f\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u6392\u67e5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f53\u4e00\u4e2a Java \u8fdb\u7a0b\u7a81\u7136\u6d88\u5931\u540e\uff0c\u4f60\u4f1a\u5982\u4f55\u8fdb\u884c\u6392\u67e5\uff1f\u4ece\u54ea\u91cc\u5f00\u59cb\u5165\u624b\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9047\u5230\u8fd9\u4e2a\u95ee\u9898\uff0c\u76f8\u4fe1\u6ca1\u7ecf\u9a8c\u7684\u4eba\u80af\u5b9a\u662f\u5e72\u7740\u6025\u3002\u4f46\u662f\u5e72\u7740\u6025\u662f\u6ca1\u7528\u7684\uff0c\u5fc5\u987b\u8981\u627e\u8bc1\u636e\u3002\u6211\u9996\u5148\u5b89\u6392\u8fd0\u7ef4\u6392\u67e5\uff0c\u4f46\u662f\u8fd0\u7ef4\u4e5f\u4ece\u6765\u6ca1\u9047\u5230\u8fc7\u8fd9\u4e2a\u68d8\u624b\u7684\u95ee\u9898\u3002\u4e8e\u662f\uff0c\u53ea\u80fd\u6211\u4eb2\u81ea\u4e0a\u9635\u4e86\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u9996\u5148\u770b\u4e86\u770b history\uff0c\u770b\u770b\u662f\u4e0d\u662f\u6709\u4eba\u5728\u670d\u52a1\u5668\u4e0a\u64cd\u4f5c\u4e86\u4ec0\u4e48\uff0c\u7ed3\u679c history \u91cc\u4ec0\u4e48\u4e5f\u6ca1\u6709\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8e\u662f\u6211\u53c8\u53bb\u67e5\u770b\u8fdb\u7a0b\u6240\u5728\u76ee\u5f55\uff0c\u770b\u770b\u662f\u4e0d\u662f\u56e0\u4e3a OOM \u5bfc\u81f4\u7684\uff0c\u5982\u679c\u662f OOM\uff0c\u90a3\u4e48\u901a\u8fc7\u6211\u4eec\u914d\u7f6e\u7684\u53c2\u6570\uff0c\u7a0b\u5e8f\u80af\u5b9a\u4f1a\u7559\u4e0b dump \u6587\u4ef6\u3002\u4f46\u662f\uff0c\u7ecf\u8fc7\u6211\u7684\u6392\u67e5\u53d1\u73b0\uff0c\u6d88\u5931\u7684\u8fdb\u7a0b\u5e76\u6ca1\u6709\u7559\u4e0b dump \u6587\u4ef6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53e6\u5916\u5728\u6392\u67e5\u8fc7\u7a0b\u4e2d\uff0c\u4e5f\u4f7f\u7528\u4e86\u4e00\u5806\u547d\u4ee4\uff0c\u6bd4\u5982 top\u3001free -h\u3001ps\u3001df \u7b49\u5404\u9879\u6307\u6807\u5747\u6ca1\u6709\u660e\u663e\u5f02\u5e38\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e8e\u662f\uff0c\u6211\u521d\u6b65\u5f97\u51fa\u7ed3\u8bba\uff0c\u53ef\u80fd\u662f\u7cfb\u7edf\u539f\u56e0\u9020\u6210\u7684\u8fdb\u7a0b\u6d88\u5931\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>journalctl\u00a0-k\u00a0|\u00a0grep\u00a0-i\u00a0-e\u00a0memory\u00a0-e\u00a0oom<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6267\u884c\u4e0a\u9762\u7684\u547d\u4ee4\uff0c\u53ef\u4ee5\u521d\u6b65\u6392\u67e5\u51fa\uff0c\u6d88\u5931\u7684\u8fdb\u7a0b\u662f\u5426\u662f\u89e6\u53d1\u4e86 Linux \u7cfb\u7edf\u7684 OOMKiller\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6216\u8005\u901a\u8fc7\u67e5\u770b\u3001\u68c0\u67e5\u76f8\u5173\u7684\u65e5\u5fd7\u6587\u4ef6\uff08\/var\/log\/messages\uff09\u3002\u5982\u679c\u51fa\u73b0\u7c7b\u4f3c\u4e0b\u9762\u7684 Out of memory: Kill process \u4fe1\u606f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>...\nOut of memory: Kill process 9682 (mysqld) score 9 or sacrifice child\nKilled process 9682, UID 27, (mysqld) total-vm:47388kB, anon-rss:3744kB, file-rss:80kB\nhttpd invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0\nhttpd cpuset=\/ mems_allowed=0\nPid: 8911, comm: httpd Not tainted 2.6.32-279.1.1.el6.i686 #1\n...\n21556 total pagecache pages\n21049 pages in swap cache\nSwap cache stats: add 12819103, delete 12798054, find 3188096\/4634617\nFree swap  = 0kB\nTotal swap = 524280kB\n131071 pages RAM\n0 pages HighMem\n3673 pages reserved\n67960 pages shared\n124940 pages non-shared\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e9b\u65e5\u5fd7\u4fe1\u606f\u663e\u793a\u5bf9\u5e94\u8fdb\u7a0b\u89e6\u53d1 Linux \u5185\u6838\u91cc\u7684 Out of Memory (OOM) killer\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ea7\u751f\u7684\u539f\u56e0\u901a\u5e38\u662f\u56e0\u4e3a\u67d0\u65f6\u523b\u5e94\u7528\u7a0b\u5e8f\u5927\u91cf\u8bf7\u6c42\u5185\u5b58\u5bfc\u81f4\u7cfb\u7edf\u5185\u5b58\u4e0d\u8db3\u9020\u6210\u7684\uff0c\u8fd9\u4f1a\u89e6\u53d1 OOM killer\uff0c\u8fdb\u800c\u4f1a\u6740\u6389\u67d0\u4e2a\u8fdb\u7a0b\u4ee5\u817e\u51fa\u5185\u5b58\u7559\u7ed9\u7cfb\u7edf\u7528\uff0c\u4e0d\u81f4\u4e8e\u8ba9\u7cfb\u7edf\u7acb\u523b\u5d29\u6e83\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">OOM killer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Linux \u5185\u6838\u6839\u636e\u5e94\u7528\u7a0b\u5e8f\u7684\u8981\u6c42\u5206\u914d\u5185\u5b58\uff0c\u901a\u5e38\u6765\u8bf4\u5e94\u7528\u7a0b\u5e8f\u5206\u914d\u4e86\u5185\u5b58\u4f46\u662f\u5e76\u6ca1\u6709\u5b9e\u9645\u5168\u90e8\u4f7f\u7528\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6027\u80fd\uff0c\u8fd9\u90e8\u5206\u6ca1\u7528\u7684\u5185\u5b58\u53ef\u4ee5\u7559\u4f5c\u5b83\u7528\uff0c\u8fd9\u90e8\u5206\u5185\u5b58\u662f\u5c5e\u4e8e\u6bcf\u4e2a\u8fdb\u7a0b\u7684\uff0c\u5185\u6838\u76f4\u63a5\u56de\u6536\u5229\u7528\u7684\u8bdd\u6bd4\u8f83\u9ebb\u70e6\uff0c\u6240\u4ee5\u5185\u6838\u91c7\u7528\u4e00\u79cd\u8fc7\u5ea6\u5206\u914d\u5185\u5b58\uff08over-commit memory\uff09\u7684\u529e\u6cd5\u6765\u95f4\u63a5\u5229\u7528\u8fd9\u90e8\u5206 \u201c\u7a7a\u95f2\u201d \u7684\u5185\u5b58\uff0c\u63d0\u9ad8\u6574\u4f53\u5185\u5b58\u7684\u4f7f\u7528\u6548\u7387\u3002\u4e00\u822c\u6765\u8bf4\u8fd9\u6837\u505a\u6ca1\u6709\u95ee\u9898\uff0c\u4f46\u5f53\u5927\u591a\u6570\u5e94\u7528\u7a0b\u5e8f\u90fd\u6d88\u8017\u5b8c\u81ea\u5df1\u7684\u5185\u5b58\u7684\u65f6\u5019\u9ebb\u70e6\u5c31\u6765\u4e86\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u5e94\u7528\u7a0b\u5e8f\u7684\u5185\u5b58\u9700\u6c42\u52a0\u8d77\u6765\u8d85\u51fa\u4e86\u7269\u7406\u5185\u5b58\uff08\u5305\u62ec swap\uff09\u7684\u5bb9\u91cf\uff0c\u5185\u6838\uff08OOM killer\uff09\u5fc5\u987b\u6740\u6389\u4e00\u4e9b\u8fdb\u7a0b\u624d\u80fd\u817e\u51fa\u7a7a\u95f4\u4fdd\u969c\u7cfb\u7edf\u6b63\u5e38\u8fd0\u884c\u3002\u7528\u94f6\u884c\u7684\u4f8b\u5b50\u6765\u8bb2\u53ef\u80fd\u66f4\u5bb9\u6613\u61c2\u4e00\u4e9b\uff0c\u90e8\u5206\u4eba\u53d6\u94b1\u7684\u65f6\u5019\u94f6\u884c\u4e0d\u6015\uff0c\u94f6\u884c\u6709\u8db3\u591f\u7684\u5b58\u6b3e\u5e94\u4ed8\uff0c\u5f53\u5168\u56fd\u4eba\u6c11\uff08\u6216\u8005\u7edd\u5927\u591a\u6570\uff09\u90fd\u53d6\u94b1\u800c\u4e14\u6bcf\u4e2a\u4eba\u90fd\u60f3\u628a\u81ea\u5df1\u94b1\u53d6\u5b8c\u7684\u65f6\u5019\u94f6\u884c\u7684\u9ebb\u70e6\u5c31\u6765\u4e86\uff0c\u94f6\u884c\u5b9e\u9645\u4e0a\u662f\u6ca1\u6709\u8fd9\u4e48\u591a\u94b1\u7ed9\u5927\u5bb6\u53d6\u7684\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5185\u6838\u68c0\u6d4b\u5230\u7cfb\u7edf\u5185\u5b58\u4e0d\u8db3\u3001\u6311\u9009\u5e76\u6740\u6389\u67d0\u4e2a\u8fdb\u7a0b\u7684\u8fc7\u7a0b\u53ef\u4ee5\u53c2\u8003\u5185\u6838\u6e90\u4ee3\u7801 linux\/mm\/oom_kill.c\uff0c\u5f53\u7cfb\u7edf\u5185\u5b58\u4e0d\u8db3\u7684\u65f6\u5019\uff0cout_of_memory() \u88ab\u89e6\u53d1\uff0c\u7136\u540e\u8c03\u7528 select_bad_process() \u9009\u62e9\u4e00\u4e2a \u201cbad\u201d \u8fdb\u7a0b\u6740\u6389\uff0c\u5982\u4f55\u5224\u65ad\u548c\u9009\u62e9\u4e00\u4e2a \u201cbad\u201d \u8fdb\u7a0b\u5462\uff0c\u603b\u4e0d\u80fd\u968f\u673a\u9009\u5427\uff1f\u6311\u9009\u7684\u8fc7\u7a0b\u7531 oom_badness() \u51b3\u5b9a\uff0c\u6311\u9009\u7684\u7b97\u6cd5\u548c\u60f3\u6cd5\u90fd\u5f88\u7b80\u5355\u5f88\u6734\u5b9e\uff1a\u6700 bad \u7684\u90a3\u4e2a\u8fdb\u7a0b\u5c31\u662f\u90a3\u4e2a\u6700\u5360\u7528\u5185\u5b58\u7684\u8fdb\u7a0b\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u914d\u7f6e\u89e3\u51b3 OOM killer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u6700\u7b80\u5355\u7684\u529e\u6cd5\u5c31\u662f\u589e\u52a0\u5185\u5b58\uff1b\u5176\u4e8c\u5c31\u662f\u4f18\u5316\u7a0b\u5e8f\u5360\u7528\u7684\u5185\u5b58\uff1b\u5f53\u7136\u8fd8\u6709\u4e00\u79cd\u4e34\u65f6\u7684\u529e\u6cd5\u5c31\u662f\u8c03\u6574\u5185\u6838\u53c2\u6570\uff0c\u8ba9 Java \u8fdb\u7a0b\u4e0d\u5bb9\u6613\u88ab OOM killer \u53d1\u73b0\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u4fdd\u62a4\u91cd\u8981\u8fdb\u7a0b\u4e0d\u88ab oom-killer \u6389\uff0c\u6211\u4eec\u53ef\u4ee5\uff1aecho -17 &gt; \/proc\/\/oom_adj\u3002\u5176\u4e2d\u7684\u6570\u5b57 -17 \u8868\u793a\u7981\u7528 OOM\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6216\u8005\u628a\u6574\u4e2a\u7cfb\u7edf\u7684 OOM \u7ed9\u7981\u7528\u6389\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sysctl\u00a0-w\u00a0vm.panic_on_oom=1sysctl\u00a0-p<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u6216\u8005\u901a\u8fc7\u53c2\u6570 \/proc\/sys\/vm\/overcommit_memory \u63a7\u5236\u8fdb\u7a0b\u5bf9\u5185\u5b58\u8fc7\u91cf\u4f7f\u7528\u7684\u5e94\u5bf9\u7b56\u7565\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5f53 overcommit_memory=0 \u5141\u8bb8\u8fdb\u7a0b\u8f7b\u5fae\u8fc7\u91cf\u4f7f\u7528\u5185\u5b58\uff0c\u4f46\u5bf9\u4e8e\u5927\u91cf\u8fc7\u8f7d\u8bf7\u6c42\u5219\u4e0d\u5141\u8bb8<\/li><li>\u5f53 overcommit_memory=1 \u6c38\u8fdc\u5141\u8bb8\u8fdb\u7a0b overcommit<\/li><li>\u5f53 overcommit_memory=2 \u6c38\u8fdc\u7981\u6b62 overcommit<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u5185\u5bb9\uff0c\u5e0c\u671b\u80fd\u7ed9\u5927\u5bb6\u5e26\u6765\u6536\u83b7\u3002\u5982\u679c\u4f60\u9047\u5230\u8fc7\u7c7b\u4f3c\u95ee\u9898\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u5206\u4eab\u4e00\u4e0b\u4f60\u7684\u7ecf\u9a8c\uff0c\u5982\u679c\u6ca1\u6709\u9047\u5230\u8fc7\uff0c\u77e5\u9053\u8fd9\u4e2a\u95ee\u9898\u70b9\u5c31\u53ef\u4ee5\u4e86\uff0c\u4ee5\u540e\u518d\u9047\u5230\u7c7b\u4f3c\u95ee\u9898\u5c31\u4e0d\u81f3\u4e8e\u614c\u4e86\u9635\u811a\uff01<\/p>\n<!-- <audio autoplay=\"autoplay\" height=\"100\" width=\"100\" hidden=\"true\"><source src=\"https:\/\/c.coka.la\/orAvPR.mp3\" type=\"audio\/mp3\"\/><\/audio><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/ws3.sinaimg.cn\/large\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/> --><p><!-- <img decoding=\"async\" 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