{"id":7401,"date":"2022-08-30T11:40:33","date_gmt":"2022-08-30T03:40:33","guid":{"rendered":"https:\/\/egonlin.com\/?p=7401"},"modified":"2022-10-21T13:07:23","modified_gmt":"2022-10-21T05:07:23","slug":"oom","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=7401","title":{"rendered":"OOM"},"content":{"rendered":"<h1>\u4e00 OOM\u6848\u4f8b\u6f14\u793a<\/h1>\n<p>\u5f3a\u8c03\uff1a\u6f14\u793a\u4e4b\u524d\uff0c\u5148\u628aswap\u5173\u6389\uff0c\u9632\u6b62\u5185\u5b58\u4e0d\u591f\u7528\u4e4b\u540e\u4f7f\u7528swap\u5f71\u54cd\u4f60\u770b\u5230OOM\u7684\u6548\u679c\uff0c\u81f3\u4e8eswap\u7684\u5f71\u54cd\u6211\u4eec\u540e\u7eed\u4f1a\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n<p>C\u8bed\u8a00\u5185\u5b58\u7a7a\u95f4\u5206\u914d\u51fdmalloc()\u6570\u7b80\u4ecb\uff1a<\/p>\n<pre><code class=\"language-bash\">linux\u7cfb\u7edf\u91cc\u7684\u7a0b\u5e8f\u90fd\u662f\u8c03\u7528\u63a5\u53e3malloc()\u6765\u7533\u8bf7\u5185\u5b58\n\n\u8c03\u7528\u5f62\u5f0f\uff1a\n(\u7c7b\u578b\u8bf4\u660e\u7b26*)malloc(size)\n\u529f\u80fd\uff1a\u5728\u5185\u5b58\u7684\u52a8\u6001\u5b58\u50a8\u533a\u4e2d\u5206\u914d\u4e00\u5757\u957f\u5ea6\u4e3a\u201csize\u201d\u5b57\u8282\u7684\u8fde\u7eed\u533a\u57df\u3002\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e3a\u8be5\u533a\u57df\u7684\u9996\u5730\u5740\u3002\n\u8bf4\u660e\uff1a\n\uff081\uff09\u201c\u7c7b\u578b\u8bf4\u660e\u7b26\u201d\u8868\u793a\u628a\u8be5\u533a\u57df\u7528\u4e8e\u4f55\u79cd\u6570\u636e\u7c7b\u578b\u3002\n\uff082\uff09\uff08\u7c7b\u578b\u8bf4\u660e\u7b26*\uff09\u8868\u793a\u628a\u8fd4\u56de\u503c\u5f3a\u5236\u8f6c\u6362\u4e3a\u8be5\u7c7b\u578b\u6307\u9488\u3002\n\uff083\uff09\u201csize\u201d\u662f\u4e00\u4e2a\u65e0\u7b26\u53f7\u6570\u3002\n\u4f8b\u5982\uff1a\npc=(char*)malloc(100);\n\u8868\u793a\u5206\u914d100\u4e2a\u5b57\u8282\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5e76\u5f3a\u5236\u8f6c\u6362\u4e3a\u5b57\u7b26\u6570\u7ec4\u7c7b\u578b\uff0c\u51fd\u6570\u7684\u8fd4\u56de\u503c\u4e3a\u6307\u5411\u8be5\u5b57\u7b26\u6570\u7ec4\u7684\u6307\u9488\uff0c\u628a\u8be5\u6307\u9488\u8d4b\u4e88\u6307\u9488\u53d8\u91cfpc\u3002<\/code><\/pre>\n<p>mem_alloc.c<\/p>\n<pre><code class=\"language-bash\">[root@test04 test]# cat mem_alloc.c \n#include &lt;stdio.h&gt;\n#include &lt;malloc.h&gt;\n#include &lt;string.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;stdlib.h&gt;\n\n#define BLOCK_SIZE (1024*1024) \n\nint main(int argc, char **argv)\n{\n\n    int thr, i;\n    char *p1;\n\n    if (argc != 2) {\n        printf(&quot;Usage: mem_alloc &lt;num (MB)&gt;\\n&quot;);\n        exit(0);\n    }\n\n    thr = atoi(argv[1]); \/*\u6b64\u5904\u6307\u5b9a\u6211\u4eecfor\u5faa\u73af\u7684\u6b21\u6570\uff0c\u540e\u9762\u6211\u4eec\u542f\u4e00\u4e2afor\u5faa\u73af\u6bcf\u6b21\u7533\u8bf71M*\/\n\n    printf(&quot;Allocating,&quot; &quot;set to %d MBytes\\n&quot;, thr);\n\n    sleep(30);\n    for (i = 0; i &lt; thr; i++) {\n        p1 = malloc(BLOCK_SIZE); \/*\u5355\u4f4d\u4e3aBytes\uff0c\u6b64\u5904\u4ee3\u8868\u7533\u8bf71M\u7684\u5185\u5b58\uff0c\u5f97\u5230\u7684\u5c31\u662f\u4e00\u4e2a\u865a\u62df\u5730\u5740*\/\n        memset(p1, 0x00, BLOCK_SIZE); \/*\u5355\u4f4d\u4e3aBytes\uff0c\u6b64\u5904\u662f\u6839\u636e\u865a\u62df\u5730\u5740\u771f\u6b63\u5e94\u7528\u7269\u7406\u5185\u5b58*\/\n    }\n\n    sleep(6000);\n\n    return 0;\n}<\/code><\/pre>\n<p>\u7f16\u8bd1\u751f\u6210\u53ef\u6267\u884c\u6587\u4ef6<\/p>\n<pre><code class=\"language-bash\">gcc -o mem_alloc mem_alloc.c<\/code><\/pre>\n<p>\u8fd0\u884c\u6d4b\u8bd5\uff0c\u8be5\u8fdb\u7a0b\u542f\u52a8\u540e30s\u540e\uff0c\u4f1a\u5f00\u59cb\u5faa\u73af\u7533\u8bf7\u5185\u5bb9\uff0c\u6bcf\u6b21\u7533\u8bf71M\uff0c\u5f53\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u5c31\u4f1a\u88ab\u7cfb\u7edf\u6740\u6b7b\uff0c\u4f60\u53ef\u4ee5\u8c03\u6574\u4e0b\u97621000\u8fd9\u4e2a\u503c\u6765\u63a7\u5236\u603b\u5171\u7533\u8bf7\u5185\u5b58\u7684\u5927\u5c0f<\/p>\n<pre><code class=\"language-bash\">.\/mem_alloc 1000<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/1-1.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/1-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u63a5\u4e0b\u6765\u6211\u4eec\u628a\u8be5\u7a0b\u5e8f\u6253\u5305\u5230\u5bb9\u5668\u91cc\uff0c\u662f\u4e00\u6837\u7684\u6548\u679c\uff0c\u56e0\u4e3a\u5bb9\u5668\u672c\u8eab\u5c31\u662f\u8fdb\u7a0b\u561b<\/p>\n<pre><code class=\"language-bash\"># 1\u3001Dockerfile\nFROM centos:7\n\nADD mem_alloc \/opt\n\nENV memSize 1000\n\nCMD \/opt\/mem_alloc $memSize\n\n# 2\u3001\u6784\u5efa\u955c\u50cf\ndocker build -t mem_alloc:v1.0 .\/\n\n# 3\u3001\u6d4b\u8bd5\ndocker run -e memSize=1000 --name mem_test mem_alloc:v1.0<\/code><\/pre>\n<p>\u7136\u540e\u7d27\u63a5\u7740\u6211\u4eec\u4e3a\u8be5\u8be5\u5bb9\u5668\u8bbe\u7f6emem cgroup\u4e0a\u9650\u4e3a515MB<\/p>\n<pre><code class=\"language-bash\">sleep 2\nCONTAINER_ID=$(sudo docker ps --format &quot;{{.ID}}\\t{{.Names}}&quot; | grep -i mem_test | awk &#039;{print $1}&#039;)\necho $CONTAINER_ID\n\nCGROUP_CONTAINER_PATH=$(find \/sys\/fs\/cgroup\/memory\/ -name &quot;*$CONTAINER_ID*&quot;)\necho $CGROUP_CONTAINER_PATH\n\necho 536870912 &gt; $CGROUP_CONTAINER_PATH\/memory.limit_in_bytes\ncat $CGROUP_CONTAINER_PATH\/memory.limit_in_bytes<\/code><\/pre>\n<p>\u5bb9\u5668\u542f\u52a8\u540e\u8fd0\u884cmem_alloc\uff0c\u4e0d\u65ad\u7533\u8bf7\u5185\u5b58\uff0c\u76f4\u5230512MB\uff0c\u4f1a\u89e6\u53d1OOM\u88ab\u5e72\u6389<\/p>\n<pre><code class=\"language-bash\">[root@test04 test]# docker inspect mem_test |grep -i status -A 5\n            &quot;Status&quot;: &quot;exited&quot;,\n            &quot;Running&quot;: false,\n            &quot;Paused&quot;: false,\n            &quot;Restarting&quot;: false,\n            &quot;OOMKilled&quot;: true,  # \u8be5\u503c\u4e3atrue\n            &quot;Dead&quot;: false,<\/code><\/pre>\n<h1>\u4e8c OOM\u4ecb\u7ecd<\/h1>\n<h2>2.1 \u4ec0\u4e48\u662fOOM\uff1f<\/h2>\n<p>OOM \u5168\u79f0 Out of Memory\uff08\u5185\u5b58\u4e0d\u8db3\/\u5185\u5b58\u6ea2\u51fa\uff09\uff0c\u662flinux\u7cfb\u7edf\u7684\u4e00\u79cd\u4fdd\u62a4\u673a\u5236\uff0c\u5f53\u7269\u7406\u5185\u5b58\u4e0d\u591f\u7528\u65f6\uff0clinux\u7cfb\u7edf\u7684killer\u4f1a\u6740\u6b7b\u67d0\u4e2a\u6b63\u5728\u8fd0\u884c\u7684\u8fdb\u7a0b\u6765\u91ca\u653e\u5185\u5b58\uff0c\u5f53\u7136\u4e0d\u4f1a\u968f\u673a\u6740\u8fdb\u7a0b\uff0c\u5177\u4f53\u6740\u54ea\u4e2a\u8fdb\u7a0b\u662f\u4f1a\u5bf9\u8fdb\u7a0b\u8fdb\u884c\u8bc4\u5206\u7684\uff0c\u540e\u7eed\u5c06\u8be6\u7ec6\u4ecb\u7ecd<\/p>\n<h2>2.2 \u4f55\u65f6\u4f1a\u53d1\u751fOOM\uff1f<\/h2>\n<p>OOM\u5206\u4e3a\u6574\u4e2a\u7cfb\u7edf\u7ea7\u522b\uff0c\u4ee5\u53cacgroup\u63a7\u5236\u7ec4\u7ea7\u522b<\/p>\n<p>1\u3001\u65e0\u8bba\u5982\u4f55\uff0c\u53ea\u8981\u5185\u5b58\u4e0d\u8db3\u65f6\u80af\u5b9a\u4f1a\u89e6\u53d1OOM\uff0c\u662f\u7ad9\u5728\u6574\u4e2a\u7cfb\u7edf\u7684\u89d2\u5ea6\u53bb\u6740\u8fdb\u7a0b\uff0c\u6240\u6709\u8fdb\u7a0b\u90fd\u662f\u76ee\u6807<\/p>\n<p>2\u3001\u5185\u5b58\u5145\u8db3\uff0c\u4f46\u662f\u6240\u6709\u8fdb\u7a0b\u5bf9\u5185\u5b58\u7684\u5360\u7528\u8d85\u8fc7\u4e86\u89c4\u5b9a\u7684\u9650\u5236\uff08\u4f7f\u7528mem cgroup\u9650\u5236\uff09\uff0c\u4e5f\u4f1a\u89e6\u53d1OOM killer\uff0c\u53ea\u80fd\u6740\u6b7b\u672c\u63a7\u5236\u7ec4\u5185\u8fdb\u7a0b<\/p>\n<h2>2.3 \u4e3a\u4f55\u4e00\u5b9a\u8981\u53d1\u751fOOM\uff1f<\/h2>\n<p>\u5728linux\u4e2d\uff0c\u5185\u5b58\u7533\u8bf7\u662f\u901a\u8fc7\u8c03\u7528malloc()\u5b8c\u6210\u7684\uff0c\u4e00\u65e6\u5185\u5b58\u4e0d\u8db3\uff0c\u8be5\u65b9\u6cd5\u8c03\u7528\u5931\u8d25\u5c31\u53ef\u4ee5\u4e86\uff0c\u4e0d\u662f\u5417\uff1f\u4e3a\u4f55\u8981\u6740\u6b7b\u8fdb\u7a0b\u5462\uff1f<\/p>\n<p>\u8fd9\u4e2a\u7406\u89e3\u662f\u9519\u8bef\u7684\uff0c\u56e0\u4e3alinux\u7cfb\u7edf\u7684\u5185\u5b58\u90fd\u662f\u8d85\u914d\u7684overcommit\u3002\u5373\u7a0b\u5e8f\u7533\u8bf7\u7684\u5185\u5b58\u5176\u5b9e\u662f\u865a\u62df\u5185\u5b58\uff0c\u64cd\u4f5c\u7cfb\u7edf\u7ed9\u7a0b\u5e8f\u7684\u53ea\u662f\u4e00\u4e2a\u5730\u5740\u8303\u56f4\uff0c\u8be5\u5730\u5740\u8303\u56f4\u5bf9\u5e94\u5230\u7269\u7406\u5185\u5b58\u4e0a\uff0c\u800c\u4e14\u53ea\u6709\u5728\u7a0b\u5e8f\u5f80\u8fd9\u4e2a\u5730\u5740\u5bf9\u5e94\u7684\u7a7a\u95f4\u91cc\u5199\u5165\u6570\u636e\u65f6\u624d\u4f1a\u771f\u6b63\u5360\u7528\u7269\u7406\u5185\u5b58\uff0c\u6240\u4ee5\u7a0b\u5e8f\u7533\u8bf7\u7684\u5185\u5b58\u662f\u53ef\u4ee5\u8d85\u8fc7\u7269\u7406\u5185\u5b58\u5927\u5c0f\u7684\u3002\u4f8b\u5982\u7269\u7406\u5185\u5b58\u67091G\uff0c\u4f46\u662fmalloc()\u53ef\u4ee5\u7533\u8bf72G\u7684\u5185\u5b58\u3002<\/p>\n<p>\u793a\u4f8b1\uff1a\u7533\u8bf7\u5185\u5b58\uff0c\u83b7\u5f97\u865a\u62df\u5730\u5740\uff0c\u8fc730s\u540e\uff0c\u6839\u636e\u865a\u62df\u5730\u5740\u5e94\u7528\u7269\u7406\u5185\u5b58<\/p>\n<pre><code class=\"language-bash\">[root@test04 test]# cat overcommit_test.c \n#include &lt;stdio.h&gt;\n#include &lt;malloc.h&gt;\n#include &lt;string.h&gt;\n#include &lt;unistd.h&gt;\n#include &lt;stdlib.h&gt;\n\nint main(int argc, char **argv)\n{\n    char *p1;\n\n    p1 = malloc(100 * 1024 * 1024); \/*\u7533\u8bf7100M\u7684\u5185\u5b58\uff0c\u5f97\u5230\u7684\u5c31\u662f\u4e00\u4e2a\u865a\u62df\u5730\u5740\uff0c\u62ff\u5230\u6307\u9488p1*\/\n    sleep(30);\n    memset(p1, 0x00, 50 * 1024 * 1024); \/*\u6839\u636ep1\u6307\u9488\u7684\u6307\u5411\u7684\u865a\u62df\u5730\u5740\u771f\u6b63\u5e94\u7528\u7269\u7406\u5185\u5b58*\/\n\n    sleep(6000);\n    return 0;\n}\n\n[root@test04 test]# gcc -o overcommit_test  overcommit_test.c\n\n[root@test04 test]# .\/overcommit_test<\/code><\/pre>\n<p>\u6253\u5f00\u53e6\u5916\u4e00\u4e2a\u7ec8\u7aef\u67e5\u770b\uff0c\u7b2c\u4e00\u6b21\u67e5\u770bVIRT\u4e3a106624KB\uff08~100M\uff09\uff0cRSS\u53ea\u6709616KB<\/p>\n<pre><code class=\"language-bash\">[root@test04 ~]# ps aux |head -1\nUSER        PID  %CPU %MEM    VSZ      RSS   TTY      STAT  START   TIME COMMAND\n[root@test04 ~]# ps aux |grep overcommit_test |grep -v grep \nroot      91190  0.0  0.0     106624   616   pts\/3     S+   14:13   0:00 .\/overcommit_test\n[root@test04 ~]# \n[root@test04 ~]# \n<\/code><\/pre>\n<p>\u8fc7\u5927\u698230s\u540e\u67e5\u770b\u3002VIRT\u4e0d\u53d8\uff0cRSS\u7269\u7406\u5185\u5b58\u88ab\u5360\u7528\u5230\u4e8653960KB\uff08~50M\uff09\uff0cRSS\u624d\u662f\u771f\u6b63\u5360\u7528\u7269\u7406\u5185\u5b58\u7684\u5927\u5c0f\uff0cRRS\u5185\u5b58\u5305\u62ec\u4e86\u4ee3\u7801\u6bb5\u5185\u5b58\u3001\u6808\u5185\u5b58\u3001\u5806\u5185\u5b58\u3001\u5171\u4eab\u5e93\u7684\u5185\u5b58\uff0c\u8fd9\u4e9b\u5185\u5b58\u662f\u8fdb\u7a0b\u8fd0\u884c\u5fc5\u987b\u8981\u6709\u7684\uff0c\u6211\u4eec\u4ee3\u7801\u91ccmalloc\/memset\u5f97\u5230\u7684\u5185\u5b58\u5c31\u662f\u5806\u5185\u5b58\uff0c\u5177\u4f53RSS\u5927\u5c0f\u53ef\u4ee5\u67e5\u770b\/proc\/[pid]\/smaps\u6587\u4ef6<\/p>\n<pre><code class=\"language-bash\">[root@test04 ~]# ps aux |head -1\nUSER        PID  %CPU %MEM    VSZ      RSS   TTY      STAT  START   TIME COMMAND\n[root@test04 ~]# ps aux |grep overcommit_test |grep -v grep\nroot      91190  0.0  2.6      106624  53960  pts\/3    S+   14:13   0:00 .\/overcommit_test<\/code><\/pre>\n<p>\u8fd9\u79cdovercommit\u7684\u5185\u5b58\u7533\u8bf7\u6a21\u5f0f\u7684\u597d\u5904\u662f\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u7cfb\u7edf\u5185\u5b58\u7684\u5229\u7528\u7387\uff0c\u4f46\u574f\u5904\u5c31\u662f\u5728\u6240\u6709\u8fdb\u7a0b\u90fd\u8bd5\u56fe\u771f\u7684\u7528\u5b8c\u7533\u8bf7\u7684\u5185\u5b58\u7a7a\u95f4\u65f6\uff0c\u7269\u7406\u5185\u5b58\u53ef\u80fd\u4f1a\u53d1\u751f\u4e0d\u591f\u7528\uff0c\u7cfb\u7edf\u4e3a\u4e86\u4fdd\u547d\uff0c\u53ea\u80fd\u6740\u6389\u4e00\u4e9b\u8fdb\u7a0b\uff0c\u8fd9\u5c31\u662fOOM\u3002\u8fd9\u6709\u70b9\u50cf\u822a\u7a7a\u516c\u53f8\u591a\u5356\u51e0\u5f20\u7968\uff0c\u4e00\u767e\u4e2a\u5ea7\u4f4d\u5356105\u5f20\u7968\uff0c\u5982\u679c105\u4e2a\u4eba\u771f\u7684\u90fd\u53bb\u5750\u98de\u673a\u4e86\uff0c\u90a3\u5c31\u544a\u8bc9\u591a\u51fa\u6765\u76845\u4e2a\u4eba\uff0c\u4eca\u5929\u7531\u4e8e\u5929\u6c14\u539f\u56e0\u822a\u73ed\u53d6\u6d88\u4e86\uff0c\u611f\u8c22\u60a8\u7684\u4f53\u8c05<\/p>\n<p>\u5f53\u7136oom\u5e76\u4e0d\u4f1a\u968f\u4fbf\u62c9\u51fa\u4e00\u4e2a\u5bb9\u5668\u5e72\u6389<br \/>\n\u800c\u662f\u6709\u89c4\u5219\u7684\uff0c<\/p>\n<p>\u7cfb\u7edf\u53ef\u7528\u7684\u9875\u9762\u6570\u4e58\u4ee5oom_score_adj\uff0c\u7136\u540e\u518d\u52a0\u4e0a\u5df2\u7528\u7684\u9875\u9762\u6570<br \/>\n\u5f97\u5230\u7684\u7ed3\u679c\u8d8a\u5927\uff0c\u90a3oom\u65f6\u88ab\u6740\u6389\u7684\u51e0\u7387\u5c31\u8d8a\u5927<\/p>\n<p>\u8be6\u89c12.5\u5c0f\u8282<\/p>\n<h2>2.4 \u50a8\u5907\u77e5\u8bc6\uff1a\u4e86\u89e3MMU\u3001TLB\u4e0e\u5927\u9875\u5185\u5b58HugePages<\/h2>\n<p>\u6211\u4eec\u77e5\u9053\uff0cCPU\u662f\u901a\u8fc7\u5bfb\u5740\u6765\u8bbf\u95ee\u5185\u5b58\u7684\u300232\u4f4dCPU\u7684\u5bfb\u5740\u5bbd\u5ea6\u662f 0~0xFFFFFFFF \uff0c16^8 \u8ba1\u7b97\u540e\u5f97\u5230\u7684\u5927\u5c0f\u662f4G\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ef\u652f\u6301\u7684\u7269\u7406\u5185\u5b58\u6700\u5927\u662f4G\u3002<\/p>\n<p>\u4f46\u5728\u5b9e\u8df5\u8fc7\u7a0b\u4e2d\uff0c\u78b0\u5230\u4e86\u8fd9\u6837\u7684\u95ee\u9898\uff0c\u7a0b\u5e8f\u9700\u8981\u4f7f\u75284G\u5185\u5b58\uff0c\u800c\u53ef\u7528\u7269\u7406\u5185\u5b58\u5c0f\u4e8e4G\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u4e0d\u5f97\u4e0d\u964d\u4f4e\u5185\u5b58\u5360\u7528\u3002<br \/>\n\u4e3a\u4e86\u89e3\u51b3\u6b64\u7c7b\u95ee\u9898\uff0c\u73b0\u4ee3CPU\u5f15\u5165\u4e86 MMU\uff08Memory Management Unit \u5185\u5b58\u7ba1\u7406\u5355\u5143\uff09\u3002<\/p>\n<p>MMU \u7684\u6838\u5fc3\u601d\u60f3\u662f\u5229\u7528\u865a\u62df\u5730\u5740\u66ff\u4ee3\u7269\u7406\u5730\u5740\uff0c\u5373CPU\u5bfb\u5740\u65f6\u4f7f\u7528\u865a\u5740\uff0c\u7531 MMU \u8d1f\u8d23\u5c06\u865a\u5740\u6620\u5c04\u4e3a\u7269\u7406\u5730\u5740\u3002<br \/>\nMMU\u7684\u5f15\u5165\uff0c\u89e3\u51b3\u4e86\u5bf9\u7269\u7406\u5185\u5b58\u7684\u9650\u5236\uff0c\u5bf9\u7a0b\u5e8f\u6765\u8bf4\uff0c\u5c31\u50cf\u81ea\u5df1\u5728\u4f7f\u75284G\u5185\u5b58\u4e00\u6837\u3002<\/p>\n<p>\u5185\u5b58\u5206\u9875(Paging)\u662f\u5728\u4f7f\u7528MMU\u7684\u57fa\u7840\u4e0a\uff0c\u63d0\u51fa\u7684\u4e00\u79cd\u5185\u5b58\u7ba1\u7406\u673a\u5236\u3002\u5b83\u5c06\u865a\u62df\u5730\u5740\u548c\u7269\u7406\u5730\u5740\u6309\u56fa\u5b9a\u5927\u5c0f\uff084K\uff09\u5206\u5272\u6210\u9875(page)\u548c\u9875\u5e27(page frame)\uff0c\u5e76\u4fdd\u8bc1\u9875\u4e0e\u9875\u5e27\u7684\u5927\u5c0f\u76f8\u540c\u3002<\/p>\n<p>\u8fd9\u79cd\u673a\u5236\uff0c\u4ece\u6570\u636e\u7ed3\u6784\u4e0a\uff0c\u4fdd\u8bc1\u4e86\u8bbf\u95ee\u5185\u5b58\u7684\u9ad8\u6548\uff0c\u5e76\u4f7fOS\u80fd\u652f\u6301\u975e\u8fde\u7eed\u6027\u7684\u5185\u5b58\u5206\u914d\u3002<br \/>\n\u5728\u7a0b\u5e8f\u5185\u5b58\u4e0d\u591f\u7528\u65f6\uff0c\u8fd8\u53ef\u4ee5\u5c06\u4e0d\u5e38\u7528\u7684\u7269\u7406\u5185\u5b58\u9875\u8f6c\u79fb\u5230\u5176\u4ed6\u5b58\u50a8\u8bbe\u5907\u4e0a\uff0c\u6bd4\u5982\u78c1\u76d8\uff0c\u8fd9\u5c31\u662f\u5927\u5bb6\u8033\u719f\u80fd\u8be6\u7684\u865a\u62df\u5185\u5b58\u3002<\/p>\n<p>\u5728\u4e0a\u6587\u4e2d\u63d0\u5230\uff0c\u865a\u62df\u5730\u5740\u4e0e\u7269\u7406\u5730\u5740\u9700\u8981\u901a\u8fc7\u6620\u5c04\uff0c\u624d\u80fd\u4f7fCPU\u6b63\u5e38\u5de5\u4f5c\u3002<br \/>\n\u800c\u6620\u5c04\u5c31\u9700\u8981\u5b58\u50a8\u6620\u5c04\u8868\u3002\u5728\u73b0\u4ee3CPU\u67b6\u6784\u4e2d\uff0c\u6620\u5c04\u5173\u7cfb\u901a\u5e38\u88ab\u5b58\u50a8\u5728\u7269\u7406\u5185\u5b58\u4e0a\u4e00\u4e2a\u88ab\u79f0\u4e4b\u4e3a\u9875\u8868(page table)\u7684\u5730\u65b9\u3002<br \/>\n\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/1111.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/1111.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u4ece\u8fd9\u5f20\u56fe\u4e2d\uff0c\u53ef\u4ee5\u6e05\u6670\u5730\u770b\u5230CPU\u4e0e\u9875\u8868\uff0c\u7269\u7406\u5185\u5b58\u4e4b\u95f4\u7684\u4ea4\u4e92\u5173\u7cfb\u3002<\/p>\n<p><strong>\u8fdb\u4e00\u6b65\u4f18\u5316\uff0c\u5f15\u5165TLB\uff08Translation lookaside buffer\uff0c\u9875\u8868\u5bc4\u5b58\u5668\u7f13\u51b2\uff09<\/strong><br \/>\n\u7531\u4e0a\u4e00\u8282\u53ef\u77e5\uff0c\u9875\u8868\u662f\u88ab\u5b58\u50a8\u5728\u5185\u5b58\u4e2d\u7684\u3002\u6211\u4eec\u77e5\u9053CPU\u901a\u8fc7\u603b\u7ebf\u8bbf\u95ee\u5185\u5b58\uff0c\u80af\u5b9a\u6162\u4e8e\u76f4\u63a5\u8bbf\u95ee\u5bc4\u5b58\u5668\u7684\u3002<br \/>\n\u4e3a\u4e86\u8fdb\u4e00\u6b65\u4f18\u5316\u6027\u80fd\uff0c\u73b0\u4ee3CPU\u67b6\u6784\u5f15\u5165\u4e86TLB\uff0c\u7528\u6765\u7f13\u5b58\u4e00\u90e8\u5206\u7ecf\u5e38\u8bbf\u95ee\u7684\u9875\u8868\u5185\u5bb9\u3002<br \/>\n\u5982\u4e0b\u56fe\uff1a<\/p>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/2222.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/2222.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<p>\u5bf9\u6bd4\u524d\u9762\u90a3\u5f20\u56fe\uff0c\u5728\u4e2d\u95f4\u52a0\u5165\u4e86TLB\u3002<\/p>\n<p><strong>\u4e3a\u4ec0\u4e48\u8981\u652f\u6301\u5927\u5185\u5b58\u5206\u9875\uff1f<\/strong><br \/>\nTLB\u662f\u6709\u9650\u7684\uff0c\u8fd9\u70b9\u6beb\u65e0\u7591\u95ee\u3002\u5f53\u8d85\u51faTLB\u7684\u5b58\u50a8\u6781\u9650\u65f6\uff0c\u5c31\u4f1a\u53d1\u751f TLB miss\uff0c\u4e4b\u540e\uff0cOS\u5c31\u4f1a\u547d\u4ee4CPU\u53bb\u8bbf\u95ee\u5185\u5b58\u4e0a\u7684\u9875\u8868\u3002\u5982\u679c\u9891\u7e41\u7684\u51fa\u73b0TLB miss\uff0c\u7a0b\u5e8f\u7684\u6027\u80fd\u4f1a\u4e0b\u964d\u5730\u5f88\u5feb\u3002<\/p>\n<p>\u4e3a\u4e86\u8ba9TLB\u53ef\u4ee5\u5b58\u50a8\u66f4\u591a\u7684\u9875\u5730\u5740\u6620\u5c04\u5173\u7cfb\uff0c\u6211\u4eec\u7684\u505a\u6cd5\u662f\u8c03\u5927\u5185\u5b58\u5206\u9875\u5927\u5c0f\u3002<\/p>\n<p>\u5982\u679c\u4e00\u4e2a\u98754M\uff0c\u5bf9\u6bd4\u4e00\u4e2a\u98754K\uff0c\u524d\u8005\u53ef\u4ee5\u8ba9TLB\u591a\u5b58\u50a81000\u4e2a\u9875\u5730\u5740\u6620\u5c04\u5173\u7cfb\uff0c\u6027\u80fd\u7684\u63d0\u5347\u662f\u6bd4\u8f83\u53ef\u89c2\u7684\u3002<\/p>\n<p><strong>\u8c03\u6574OS\u5185\u5b58\u5206\u9875<\/strong><\/p>\n<p>\u5728[Linux]()\u548cwindows\u4e0b\u8981\u542f\u7528\u5927\u5185\u5b58\u9875\uff0c\u6709\u4e00\u4e9b\u9650\u5236\u548c\u8bbe\u7f6e\u6b65\u9aa4\u3002<\/p>\n<p><strong>Linux\uff1a<\/strong><br \/>\n\u9650\u5236\uff1a\u9700\u89812.6\u5185\u6838\u4ee5\u4e0a\u62162.4\u5185\u6838\u5df2\u6253\u5927\u5185\u5b58\u9875\u8865\u4e01\u3002<br \/>\n\u786e\u8ba4\u662f\u5426\u652f\u6301\uff0c\u8bf7\u5728\u7ec8\u7aef\u6572\u5982\u4e0b\u547d\u4ee4\uff1a<\/p>\n<p># cat \/proc\/meminfo | grep Huge<br \/>\nHugePages_Total: 0<br \/>\nHugePages_Free: 0<br \/>\nHugepagesize: 2048 kB   # hugepagesize\u8bbe\u7f6e\u89c1\u6587\u6863\uff1a<a href=\"https:\/\/www.jianshu.com\/p\/b9470fc331dd\">https:\/\/www.jianshu.com\/p\/b9470fc331dd<\/a><\/p>\n<p>\u5982\u679c\u6709HugePage\u5b57\u6837\u7684\u8f93\u51fa\u5185\u5bb9\uff0c\u8bf4\u660e\u4f60\u7684OS\u662f\u652f\u6301\u5927\u5185\u5b58\u5206\u9875\u7684\u3002Hugepagesize\u5c31\u662f\u9ed8\u8ba4\u7684\u5927\u5185\u5b58\u9875size\u3002<br \/>\n\u63a5\u4e0b\u6765\uff0c\u4e3a\u4e86\u8ba9JVM\u53ef\u4ee5\u8c03\u6574\u5927\u5185\u5b58\u9875size\uff0c\u9700\u8981\u8bbe\u7f6e\u4e0bOS \u5171\u4eab\u5185\u5b58\u6bb5\u6700\u5927\u503c \u548c \u5927\u5185\u5b58\u9875\u6570\u91cf\u3002<\/p>\n<p><strong>\u5171\u4eab\u5185\u5b58\u6bb5\u6700\u5927\u503c<\/strong><br \/>\n\u5efa\u8bae\u8fd9\u4e2a\u503c\u5927\u4e8eJava Heap size\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u91cc\u8bbe\u7f6e\u4e864G\u5185\u5b58\u3002<\/p>\n<p># echo 4294967295 &gt; \/proc\/sys\/kernel\/shmmax<\/p>\n<p><strong>\u5927\u5185\u5b58\u9875\u6570\u91cf<\/strong><\/p>\n<p># echo 154 &gt; \/proc\/sys\/vm\/nr_hugepages<\/p>\n<p>\u8fd9\u4e2a\u503c\u4e00\u822c\u662f Java\u8fdb\u7a0b\u5360\u7528\u6700\u5927\u5185\u5b58\/\u5355\u4e2a\u9875\u7684\u5927\u5c0f \uff0c\u6bd4\u5982java\u8bbe\u7f6e 1.5G\uff0c\u5355\u4e2a\u9875 10M\uff0c\u90a3\u4e48\u6570\u91cf\u4e3a  1536\/10 = 154\u3002<br \/>\n\u6ce8\u610f\uff1a\u56e0\u4e3aproc\u662f\u5185\u5b58FS\uff0c\u4e3a\u4e86\u4e0d\u8ba9\u4f60\u7684\u8bbe\u7f6e\u5728\u91cd\u542f\u540e\u88ab\u51b2\u6389\uff0c\u5efa\u8bae\u5199\u4e2a\u811a\u672c\u653e\u5230 init \u9636\u6bb5(rc.local)\u3002<\/p>\n<p>numa<\/p>\n<p>numa\u662f\u4e00\u79cd\u5173\u4e8e\u591a\u4e2acpu\u5982\u4f55\u8bbf\u95ee\u5185\u5b58\u7684\u67b6\u6784\u6a21\u578b\uff0c\u73b0\u5728\u7684cpu\u57fa\u672c\u90fd\u662fnuma\u67b6\u6784\uff0clinux\u5185\u68382.5\u5f00\u59cb\u652f\u6301numa\u3002<\/p>\n<p>numa\u67b6\u6784\u7b80\u5355\u70b9\u513f\u8bf4\u5c31\u662f\uff0c\u4e00\u4e2a\u7269\u7406cpu\uff08\u4e00\u822c\u5305\u542b\u591a\u4e2a\u903b\u8f91cpu\u6216\u8005\u8bf4\u591a\u4e2a\u6838\u5fc3\uff09\u6784\u6210\u4e00\u4e2anode\uff0c\u8fd9\u4e2anode\u4e0d\u4ec5\u5305\u62eccpu\uff0c\u8fd8\u5305\u62ec\u4e00\u7ec4\u5185\u5b58\u63d2\u69fd\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u4e2a\u7269\u7406cpu\u4ee5\u53ca\u4e00\u5757\u5185\u5b58\u6784\u6210\u4e86\u4e00\u4e2anode\u3002\u6bcf\u4e2acpu\u53ef\u4ee5\u8bbf\u95ee\u81ea\u5df1node\u4e0b\u7684\u5185\u5b58\uff0c\u4e5f\u53ef\u4ee5\u8bbf\u95ee\u5176\u4ed6node\u7684\u5185\u5b58\uff0c\u4f46\u662f\u8bbf\u95ee\u901f\u5ea6\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u81ea\u5df1node\u4e0b\u7684\u66f4\u5feb\u3002numactl &#8211;hardware\u547d\u4ee4\u53ef\u4ee5\u67e5\u770bnode\u72b6\u51b5\u3002<\/p>\n<p>\u901a\u8fc7numactl\u542f\u52a8\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u6307\u5b9anode\u7ed1\u5b9a\u89c4\u5219\u548c\u5185\u5b58\u4f7f\u7528\u89c4\u5219\u3002\u53ef\u4ee5\u901a\u8fc7cpunodebind\u53c2\u6570\u4f7f\u8fdb\u7a0b\u4f7f\u7528\u56fa\u5b9anode\u4e0a\u7684cpu\uff0c\u4f7f\u7528localalloc\u53c2\u6570\u6307\u5b9a\u8fdb\u7a0b\u53ea\u4f7f\u7528cpu\u6240\u5728node\u4e0a\u5206\u914d\u7684\u5185\u5b58\u3002\u5982\u679c\u5206\u914d\u7684node\u4e0a\u7684\u5185\u5b58\u8db3\u591f\u7528\uff0c\u8fd9\u6837\u53ef\u4ee5\u51cf\u5c11\u6296\u52a8\uff0c\u63d0\u4f9b\u6027\u80fd\u3002\u5982\u679c\u5185\u5b58\u7d27\u5f20\uff0c\u5219\u5e94\u8be5\u4f7f\u7528interleave\u53c2\u6570\uff0c\u5426\u5219\u8fdb\u7a0b\u4f1a\u56e0\u4e3a\u53ea\u80fd\u4f7f\u7528\u90e8\u5206\u5185\u5b58\u800cout of memory\u6216\u8005\u4f7f\u7528swap\u533a\u9020\u6210\u6027\u80fd\u4e0b\u964d\u3002<\/p>\n<p>NUMA\u7684\u5185\u5b58\u5206\u914d\u7b56\u7565\u6709localalloc\u3001preferred\u3001membind\u3001interleave\u3002<\/p>\n<ul>\n<li>localalloc\u89c4\u5b9a\u8fdb\u7a0b\u4ece\u5f53\u524dnode\u4e0a\u8bf7\u6c42\u5206\u914d\u5185\u5b58\uff1b<\/li>\n<li>preferred\u6bd4\u8f83\u5bbd\u677e\u5730\u6307\u5b9a\u4e86\u4e00\u4e2a\u63a8\u8350\u7684node\u6765\u83b7\u53d6\u5185\u5b58\uff0c\u5982\u679c\u88ab\u63a8\u8350\u7684node\u4e0a\u6ca1\u6709\u8db3\u591f\u5185\u5b58\uff0c\u8fdb\u7a0b\u53ef\u4ee5\u5c1d\u8bd5\u522b\u7684node\u3002<\/li>\n<li>membind\u53ef\u4ee5\u6307\u5b9a\u82e5\u5e72\u4e2anode\uff0c\u8fdb\u7a0b\u53ea\u80fd\u4ece\u8fd9\u4e9b\u6307\u5b9a\u7684node\u4e0a\u8bf7\u6c42\u5206\u914d\u5185\u5b58\u3002<\/li>\n<li>interleave\u89c4\u5b9a\u8fdb\u7a0b\u4ece\u6307\u5b9a\u7684\u82e5\u5e72\u4e2anode\u4e0a\u4ee5RR\uff08Round Robin \u8f6e\u8be2\u8c03\u5ea6\uff09\u7b97\u6cd5\u4ea4\u7ec7\u5730\u8bf7\u6c42\u5206\u914d\u5185\u5b58\u3002<\/li>\n<\/ul>\n<h2>2.5 OOM\u53d1\u751f\u65f6\u4ec0\u4e48\u8fdb\u7a0b\u4f1a\u88ab\u6740\u6389<\/h2>\n<p>\u5f53OOM\u53d1\u751f\u65f6\uff0c\u5e76\u4e0d\u4f1a\u968f\u673a\u6740\u8fdb\u7a0b\uff0c\u5177\u4f53\u6740\u54ea\u4e2a\u8fdb\u7a0b\u662f\u4f1a\u8c03\u7528\u5185\u6838\u4e86\u4e00\u4e2aoom_badness()\u51fd\u6570\u6765\u8bc4\u5b9a\uff0c\u4e3b\u8981\u5c31\u662f\u4e24\u4e2a\u6307\u6807<\/p>\n<p>1\u3001\u8fdb\u7a0b\u5df2\u7ecf\u4f7f\u7528\u7684\u7269\u7406\u5185\u5b58\u9875\u9762\u6570<\/p>\n<p>2\u3001\u6bcf\u4e2a\u8fdb\u7a0b\u7684OOM\u6821\u51c6\u503coom_score_adj<\/p>\n<pre><code class=\"language-bash\">\u5728\/proc\u6587\u4ef6\u7cfb\u7edf\u4e2d\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u90fd\u6709\u4e00\u4e2a\/proc\/oom_score_adj\u7684\u63a5\u53e3\u6587\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u5728\u8be5\u6587\u4ef6\u4e2d\u8f93\u5165-1000\u52301000\u4e4b\u95f4\u7684\u4efb\u610f\u4e00\u4e2a\u6570\u503c\uff0c\u6765\u8c03\u6574\n\u8be5\u8fdb\u7a0b\u88abOOM kill\u7684\u51e0\u7387<\/code><\/pre>\n<p>oom_badness()\u51fd\u6570\u4f1a\u8ba1\u7b97\u4e00\u4e2a\u8bc4\u5206<\/p>\n<p>\u8bc4\u5206=\u7cfb\u7edf\u603b\u7684\u53ef\u7528\u9875\u9762\u6570 * oom_score_adj\u503c + \u8fdb\u7a0b\u5df2\u7ecf\u4f7f\u7528\u7684\u7269\u7406\u9875\u9762\u6570<\/p>\n<p>\u8be5\u8bc4\u5206\u7684\u503c\u8d8a\u5927\uff0c\u88abOOM kill\u6389\u7684\u51e0\u7387\u5c31\u8d8a\u5927\u3002<\/p>\n<h1>\u4e09 memory cgroup<\/h1>\n<p>\u6bcf\u4e2aCgroups\u7684\u5b50\u7cfb\u7edf\u90fd\u662f\u901a\u8fc7\u4e00\u4e2a\u865a\u62df\u6587\u4ef6\u7cfb\u7edf\u6302\u8f7d\u70b9\u7684\u65b9\u5f0f\uff0c\u6302\u5230\u4e00\u4e2a\u7f3a\u7701\u7684\u76ee\u5f55\u4e0b\u3002\u5728linux\u53d1\u884c\u7248\u91cc\uff0cmemory cgroup\u4e00\u822c\u662f\u6302\u8f7d\u5230\/sys\/fs\/cgroup\/memory\u76ee\u5f55\u4e0b\uff0c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5b50\u76ee\u5f55\u4f5c\u4e3a\u63a7\u5236\u7ec4\u3002<\/p>\n<p>\u63a7\u5236\u7ec4\u53c2\u6570\u6709\u5f88\u591a\uff0c\u6211\u4eec\u4e3b\u8981\u5173\u6ce83\u4e2a<\/p>\n<p>\u53c2\u65701\uff1amemory.limit_in_bytes\uff1a<\/p>\n<pre><code class=\"language-bash\">\u6700\u5173\u952e\u7684\u4e00\u4e2a\u53c2\u6570\uff0c\u7528\u4e8e\u63a7\u5236\u8be5\u63a7\u5236\u7ec4\u5185\u6240\u6709\u8fdb\u7a0b\u53ef\u7528\u5185\u5b58\u7684\u6700\u5927\u503c\uff0c\u4e00\u65e6\u8d85\u8fc7\u8be5\u503c\u9ed8\u8ba4\u5c31\u4f1a\u89e6\u53d1OOM\uff0c\u4f46\u662f\u8be5OOM\u662f\u63a7\u5236\u7ec4\u7ea7\u7684\u800c\u4e0d\u662f\u7cfb\u7edf\u7ea7\u7684\uff0c\u4f60\u770b\u7cfb\u7edf\u7684\u5185\u5b58\u5b8c\u5168\u6709\u53ef\u80fd\u662f\u5145\u8db3\u7684\uff0c\u8fd9\u53ea\u662f\u5728\u9650\u5236\u63a7\u5236\u7ec4\u7ea7\u53d1\u751f\u4e86\u8d85\u51fa\u9650\u5236\u7684\u4e8b\u60c5\uff0c\u6240\u4ee5\u53ea\u4f1a\u6740\u6389\u8be5\u63a7\u5236\u7ec4\u5185\u7684\u67d0\u4e9b\u8fdb\u7a0b\u3002\u800c\u4e14\u662f\u5426\u4e00\u5b9a\u4f1a\u53d1\u751fOOM\uff0c\u5f97\u770b\u4e0b\u9762\u53c2\u6570memory.oom_control.\n\n\u8865\u5145\uff1a\n\u5728k8s\u4e2d\u5173\u4e8e\u5185\u5b58\u7684request\u4e0elimit\u8bbe\u7f6e\uff0cyaml\u6587\u4ef6\u91cc\u6307\u5b9a\u7684limit\u5c31\u662f\u5728\u6539\u4e0a\u9762\u53c2\u6570\uff0c\u81f3\u4e8erequest\u90a3\u53ea\u662f\u521b\u5efa\u5bb9\u5668\u65f6\u7684\u4e00\u4e2a\u8c03\u5ea6\u6307\u6807\uff0c\u5e76\u4e0d\u4fee\u6539\u4efb\u4f55\u53c2\u6570\n\u4e5f\u5c31\u662f\u8bf4k8s request\u4e0d\u4f1a\u4fee\u6539Memory Cgroup\u91cc\u7684\u53c2\u6570\uff0c\u5b83\u53ea\u662f\u5728kube scheduler\u91cc\u8c03\u5ea6\u7684\u65f6\u5019\uff0c\u770b\u505a\u4e2a\u8ba1\u7b97\uff0c\u770b\u8282\u70b9\u4e0a\u662f\u5426\u8fd8\u6709\u5185\u5b58\u7ed9\u8fd9\u4e2a\u65b0\u7684container\u3002<\/code><\/pre>\n<p>\u53c2\u65702\u3001memory.oom_control<\/p>\n<pre><code class=\"language-bash\">\u63a7\u5236\u5f53\u63a7\u5236\u7ec4\u5185\u6240\u6709\u8fdb\u7a0b\u5360\u7528\u5185\u5b58\u8fbe\u5230\u4e0a\u9650\u65f6\uff0c\u662f\u5426\u4f1a\u89e6\u53d1OOM\uff0c\u9ed8\u8ba4\u4e3a\u89e6\u53d1\uff0c\u8bbe\u7f6e\u4e3a1\u4ee3\u8868\u4e0d\u89e6\u53d1\uff0c\u4e00\u65e6\u5bb9\u5668\u5185\u5b58\u8fbe\u5230\u6700\u5927\u9650\u5236\u503c\uff0c\u5e76\u4e0d\u4f1a\u88aboom\uff0c\u4f46\u662fmalloc\u7533\u8bf7\u5185\u5b58\u7684\u884c\u4e3a\u4f1a\u4e2d\u6b62\uff0c\u5e76\u4e14\u4f1a\u56e0\u4e3a\u957f\u671f\u7b49\u5f85\u800c\u8fdb\u5165\u53ef\u4e2d\u65ad\u7761\u7720\u72b6\u6001\n\ncd \/sys\/fs\/cgroup\/memory\/system.slice\/docker-xxx\n\n[root@test04 xxx]# cat memory.oom_control \noom_kill_disable 0\nunder_oom 0\noom_kill 0\n[root@test04 xxx]# echo 1 &gt; memory.oom_control \n[root@test04 xxx]# cat memory.oom_control \noom_kill_disable 1\nunder_oom 0\noom_kill 0\n\n\u5f3a\u8c03\uff1a\noom\u53ea\u9488\u5bf9\u5185\u5b58\u8d85\u51fa\u7684\u60c5\u51b5\uff0ccpu\u4f7f\u7528\u7387\u8fc7\u9ad8\u662f\u4e0d\u4f1a\u88ab\u6740\u6389\u7684\uff0c\u4f46\u662f\u4f1a\u4e00\u76f4\u9650\u5236cpu\u7684\u6700\u5927\u4f7f\u7528\uff0c\uff08cpu\u65f6\u95f4\u7247\u90fd\u662f\u5171\u4eab\u7684\uff0c\u4f60\u8d85\u51fa\u4e86\u6700\u591a\u4e0d\u7ed9\u4f60\u7528\u4e86\uff0c\u4e0d\u4f1a\u6740\u4f60\u3002\u4f46\u662f\u5185\u5b58\u5728\u7533\u8bf7\u7684\u65f6\u5019\u90fd\u662f\u8d85\u914d\u7684\uff0c\u4f60\u6267\u884c\u7cfb\u7edf\u8c03\u7528malloc\u5f97\u5230\u7684\u5c31\u53ea\u662f\u4e00\u4e2a\u865a\u62df\u7684\u5730\u5740\u4e0e\u7269\u7406\u5185\u5b58\u5bf9\u5e94\uff0c\u8fd9\u5c31\u662fovercommit\u673a\u5236\uff0c\u8fd9\u6709\u6548\u589e\u5f3a\u4e86\u5185\u5b58\u5229\u7528\u7387\uff0c\u540c\u65f6\u4e5f\u57cb\u4e0b\u4e86\u9690\u60a3\uff0c\u5c31\u662f\u5982\u679c\u6240\u6709\u8fdb\u7a0b\u90fd\u6765\u771f\u7684\uff0c\u90fd\u771f\u7684\u53bb\u7528\u5b8c\u8fd9\u4e9b\u5185\u5b58\uff0c\u628a\u5185\u5b58\u5360\u6ee1\u4e86\uff0c\u8fd9\u5c31\u5fc5\u987b\u6740\u6389\u51e0\u4e2a\u6765\u91ca\u653e\u4e86\u3002\u6700\u540e\u8bf4\u4e00\u53e5\uff1a\u5185\u5b58\u4f60\u5360\u7528\u4e86\uff0c\u4f60\u4e0d\u91ca\u653e\u4f60\u5c31\u4e00\u76f4\u5360\u7528\u7740\uff0c\u4f46\u662fcpu\u53ef\u4e0d\u662f\u8fd9\u6837\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u968f\u65f6\u593a\u8d70\u4f60\u7684cpu\u6267\u884c\u6743\u9650\uff0c\u4e0d\u7ba1\u4f60\u662f\u8c01\uff0c\u4e0d\u7ba1\u4f60\u5728\u5e72\u4ec0\u4e48\uff09<\/code><\/pre>\n<p>\u53c2\u65703\u3001memory.usage_in_bytes<\/p>\n<pre><code class=\"language-bash\">\u8be5\u53c2\u6570\u53ea\u662f\u53ea\u8bfb\u7684\uff0c\u4ee3\u8868\u7684\u5c31\u662f\u63a7\u5236\u7ec4\u5185\u6240\u6709\u8fdb\u7a0b\u4f7f\u7528\u7684\u5185\u5b58\u91cf\uff0c\u901a\u8fc7\u5224\u65ad\u8be5\u503c\u5f97\u5927\u5c0f\u662f\u5426\u63a5\u8fd1memory.limit_in_bytes\u53ef\u4ee5\u65ad\u5b9a\u53d1\u751fOOM\u7684\u98ce\u9669\n\n\u6ce8\u610f\u5bf9\u4e8ememory cgroup\u7684\u63a7\u5236\u7ec4\u76ee\u5f55\u6811\u6765\u8bf4\uff0c\u5982\u679c\u7236\u7ea7group1\u7684memory.limit_in_bytes\u8bbe\u7f6e\u4e3a500M\uff0c\u90a3\u4e48\u5b50\u7ea7group3\u8bbe\u7f6e\u76841000M\u662f\u65e0\u6548\u7684\uff0c\u6700\u5927\u4e5f\u53ea\u80fd\u5230500M<\/code><\/pre>\n<p><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/2-1.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/08\/2-1.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" \/><\/div><\/p>\n<h1>\u56db \u5982\u4f55\u5b9a\u4f4dOOM\u95ee\u9898\u4e0e\u89e3\u51b3<\/h1>\n<p>\u542f\u52a8\u5bb9\u5668\uff0c\u5360\u75281000M\u5185\u5b58<\/p><div id=\"rml_readmorelogin_placeholder\" style=\"position:relative;\"><div id=\"rml_fade_content\" style=\"position: absolute;\r\ntop:-10em;\r\nwidth:100%;\r\nheight:10em;\r\nbackground: -webkit-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: -moz-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: 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class=\"wpf-label\">Password:<\/label><\/th><\/tr><tr class=\"wpf-table-placeholder\"><td class=\"wpf-table-placeholder-input\"><input class=\"regular-text text_input\" name=\"password\" value=\"\" type=\"password\"\/><\/td><\/tr><\/tbody><\/table><p class=\"wpf-table-placeholder submit\"><button class=\"wp_plugin_framework_ajax_button\" type=\"button\" style=\"background-color:#4D90FE;;color:#ffffff;;border:1px solid #3079ed;\" name=\"_event\" value=\"ButtonLogin\">Log in<\/button><\/p><\/td><td class=\"wpf-table-placeholder-input\"><\/td><\/tr><\/tbody><\/table><\/form><div id=\"ButtonStartRegister\"><a href=\"https:\/\/egonlin.com\/wp-login.php?action=register\">Register<\/a><\/div><div id=\"Link1\"><a href=\"https:\/\/egonlin.com\/wp-login.php?action=lostpassword\">Forgotten username or password?<\/a><\/div><div id=\"StatusBarFooter\"><\/div><\/div><\/div><div id=aru_remaining_content><\/div>","protected":false},"excerpt":{"rendered":"<p>\u4e00 OOM\u6848\u4f8b\u6f14\u793a 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