{"id":207453,"date":"2025-07-08T09:57:08","date_gmt":"2025-07-08T01:57:08","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207453\/"},"modified":"2025-07-08T09:57:08","modified_gmt":"2025-07-08T01:57:08","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88golang-madv_free%e6%9c%89%e6%97%b6%e4%bc%9a%e5%af%bc%e8%87%b4oom%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207453\/","title":{"rendered":"\u4e3a\u4ec0\u4e48Golang MADV_FREE\u6709\u65f6\u4f1a\u5bfc\u81f4OOM\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4e3a\u4ec0\u4e48Golang MADV_FREE\u6709\u65f6\u4f1a\u5bfc\u81f4OOM\uff1f<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-22 18:48:33<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u4eca\u5929\u5c06\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u4e3a\u4ec0\u4e48Golang MADV_FREE\u6709\u65f6\u4f1a\u5bfc\u81f4OOM\uff1f\u300b<\/span>\uff0c\u611f\u5174\u8da3\u7684\u670b\u53cb\u8bf7\u7ee7\u7eed\u770b\u4e0b\u53bb\u5427\uff01\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u4f60\u662f\u6b63\u5728\u5b66\u4e60Golang<\/span>\u6216\u8005\u5df2\u7ecf\u662f\u5927\u4f6c\u7ea7\u522b\u4e86\uff0c\u90fd\u975e\u5e38\u6b22\u8fce\u4e5f\u5e0c\u671b\u5927\u5bb6\u90fd\u80fd\u7ed9\u6211\u5efa\u8bae\u8bc4\u8bba\u54c8~\u5e0c\u671b\u80fd\u5e2e\u52a9\u5230\u5927\u5bb6\uff01<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u4eec\u4f7f\u7528go1.12\u548ck8s\u90e8\u7f72\u670d\u52a1\u3002\u5728\u5b9e\u9645\u751f\u4ea7\u73af\u5883\u4e2d\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u9879\u76ee\u4e00\u76f4OOM\uff0c\u76f4\u5230\u5bb9\u5668\u88ab\u6740\u6b7b\u3002\u7ecf\u8fc7\u7f51\u4e0a\u67e5\uff0c\u662f\u56e0\u4e3aGolang MADV_FREE \uff0c\u540e\u6765\u6211\u4eec\u8bbe\u7f6e\u4e3aMADV_DONTNEED\uff0c\u95ee\u9898\u89e3\u51b3\u4e86\u3002<\/p>\n

\u7f51\u4e0a\u8bf4\u662fMADV_Free\uff0c\u610f\u601d\u662f\u7cfb\u7edf\u53ea\u6709\u611f\u53d7\u5230\u538b\u529b\u7684\u65f6\u5019\u624d\u91ca\u653e\u5185\u5b58\u3002\u4f46\u662f\u5185\u5b58\u5206\u914d\u4e00\u76f4\u5728\u53d1\u751f\uff0c\u6211\u4eec\u7684\u5176\u4ed6\u670d\u52a1\u90fd\u5728\u540c\u4e00\u4e2a\u73af\u5883\u4e2d\u3002\u4e3a\u4ec0\u4e48\u6ca1\u6709\u53d1\u751fOOM\uff1f<\/p>\n

<\/p>\n

\u6b63\u786e\u7b54\u6848<\/h2>\n

<\/p>\n

\u55ef\uff0c\u6211\u6000\u7591\u8fd9\u6837\u7684\u95ee\u9898\u662f\u5426\u9002\u5408 SO\uff0c\u56e0\u4e3a\u5b83\u4e0d\u592a\u53ef\u80fd\u6709\u7b80\u77ed\u7684\u76f4\u63a5\u7b54\u6848\uff0c\u4e0d\u8fc7\uff0c\u8ba9\u6211\u5c1d\u8bd5\u4e00\u4e0b\u3002<\/p>\n

\u9996\u5148\u8981\u8003\u8651\u7684\u662f\uff0c\u5185\u6838\u4e2d\u7684 OOM \u6740\u624b\u5728\u5185\u6838\u53d1\u73b0\u5185\u5b58\u4e0d\u8db3\u65f6\u542f\u52a8\uff0c\u53ea\u4f1a\u627e\u5230\u5185\u5b58\u6d88\u8017\u6700\u9ad8\u7684\u8fdb\u7a0b 1 \u5e76\u5c06\u5176\u5173\u95ed\u3002 \uff08\u6211\u5e0c\u671b\u60a8\u8c08\u8bba\u7684\u662f\u5185\u6838\u4e2d\u7684 OOM \u6740\u624b\uff0c\u800c\u4e0d\u662f\u67d0\u4e9b\u7279\u5b9a\u4e8e k8s \u7684\u670d\u52a1\u6216\u60a8\u5185\u90e8\u5f00\u53d1\u7684\u4e1c\u897f\u3002\uff09<\/p>\n

\u7136\u540e\u8ba9\u6211\u4eec\u8003\u8651\u5df2\u5207\u6362\u4e3a\u4f7f\u7528 MADV_FREE<\/code> \u7684 \uff1a<\/p>\n

\u5728 Linux \u4e0a\uff0c\u8fd0\u884c\u65f6\u73b0\u5728\u4f7f\u7528 MADV_FREE<\/code> \u6765\u91ca\u653e\u672a\u4f7f\u7528\u7684\u5185\u5b58\u3002\u8fd9\u6837\u6548\u7387\u66f4\u9ad8\uff0c\u4f46\u53ef\u80fd\u4f1a\u5bfc\u81f4\u62a5\u544a\u7684 RSS \u66f4\u9ad8\u3002<\/em> \u5185\u6838\u4f1a\u5728\u9700\u8981\u65f6\u56de\u6536\u672a\u4f7f\u7528\u7684\u6570\u636e\u3002 \u8981\u6062\u590d\u5230 Go 1.11 \u884c\u4e3a (MADV_DONTNEED<\/code>)\uff0c\u8bf7\u8bbe\u7f6e\u73af\u5883\u53d8\u91cf GODEBUG=madvdontneed=1<\/code>\u3002<\/p>\n

\uff08\u5f3a\u8c03\u6211\u7684\u3002\uff09<\/p>\n

\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u4f7f\u7528 Go 1.12 \u7f16\u8bd1\u7684\u7a0b\u5e8f\u5728\u67d0\u4e2a\u6807\u51c6\u8d1f\u8f7d\u4e0b\u8fd0\u884c\u4e00\u6bb5\u65f6\u95f4\uff0c\u7136\u540e\u76f8\u540c\u7684\u7a0b\u5e8f\u5728\u76f8\u540c\u8d1f\u8f7d\u4e0b\u7684\u76f8\u540c\u65f6\u95f4\u6bb5\u5185\u8fd0\u884c\uff0c\u4f46 GODEBUG=madvdontneed =1<\/code> \u8bbe\u7f6e\uff0cRSS \u7684\u8868\u89c2<\/em>\u6d88\u8017\uff08\u4ece\u5916\u90e8\u89c2\u5bdf<\/em>\uff09\u5728\u7b2c\u4e00\u79cd\u60c5\u51b5\u4e0b\u5c06\u9ad8\u4e8e\u7b2c\u4e8c\u79cd\u60c5\u51b5\u3002
\u91cd\u7533\u4e00\u4e0b\uff0cGo \u5185\u5b58\u7ba1\u7406\u5668\u5b9e\u9645\u6807\u8bb0\u4e3a madvise(2)<\/code> \u7684\u5185\u5b58\u9875\u6570\u5728\u4e24\u6b21\u8fd0\u884c\u671f\u95f4\u5927\u81f4\u76f8\u540c\uff0c\u4f46\u7531\u4e8e\u4f7f\u7528\u8fd9\u4e24\u79cd\u65b9\u5f0f\u5904\u7406\u91ca\u653e\u7684\u9875\u7684\u8bed\u4e49\u4e0d\u540c\uff0c\u8bfb\u6570\u6240\u4f7f\u7528\u7684 RSS \u4f1a\u6709\u6240\u4e0d\u540c\u3002\u4e0d\u662f\u5b9e\u9645\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u800c\u662f RSS \u7684\u8bfb\u6570\u3002<\/p>\n

\u8fd9\u663e\u7136\u4f7f\u5f97\u4f7f\u7528 MADV_FREE<\/code> \u5c06\u5185\u5b58\u8fd4\u56de\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u7684\u8fdb\u7a0b\u66f4\u6709\u53ef\u80fd\u88ab OOM \u6740\u624b\u9009\u4e2d\u3002<\/p>\n

\u8bdd\u867d\u5982\u6b64\uff0c\u6211\u5efa\u8bae\u60a8\u5b9e\u9645\u4e0a\u4ece\u4e0d\u540c\u7684\u89d2\u5ea6\u770b\u5f85\u60a8\u7684\u95ee\u9898\u3002 \u6d4b\u91cf\u7528 Go \u7f16\u5199\u5e76\u901a\u8fc7\u201c\u5e93\u5b58\u201dGo \u5b9e\u73b0\u6784\u5efa\u7684\u7a0b\u5e8f\u7684\u5185\u5b58\u6d88\u8017\u5e76\u975e\u5b8c\u5168\u65e0\u7528\uff0c\u800c\u4ec5\u5bf9\u6355\u6349\u4e00\u4e9b\u660e\u663e<\/em>\u7684\u4e1c\u897f\u6709\u7528\uff0c\u4f8b\u5982\u591a\u4e2a GC \u626b\u63cf\u5468\u671f\u5185\u7684\u7a33\u5b9a\u5185\u5b58\u589e\u957f\uff0c\u8fd9\u53ef\u80fd\u662f\u8868\u660e\u5185\u5b58\u6cc4\u6f0f\u3002 \u8981\u5b9e\u9645\u8bc4\u4f30\u771f\u5b9e\u7684\u5185\u5b58\u4f7f\u7528\u6a21\u5f0f\uff0c\u60a8\u5fc5\u987b\u4f7f\u7528\u6b63\u5728\u8fd0\u884c\u7684\u7a0b\u5e8f\u7684 Go \u8fd0\u884c\u65f6\u63d0\u4f9b\u7684\u6307\u6807\u3002 \u6211\u8bd5\u56fe\u8be6\u7ec6\u8bf4\u660e\u8fd9\u4e2a\u7684\u539f\u56e0\u3002<\/p>\n

\u6240\u4ee5\u6211\u60f3\u8bf4\uff0c\u4f60\u6700\u597d\u96c6\u4e2d\u7cbe\u529b\u4fee\u590d OOM Killer \u8bbe\u7f6e\u6216\u7c7b\u4f3c\u7684\u4e1c\u897f\uff08\u8bf7\u6ce8\u610f\uff0c\u53ef\u4ee5\u4f7f\u7279\u5b9a\u8fdb\u7a0b\u514d\u53d7 OOM Killer \u7684\u5f71\u54cd\uff09\u3002<\/p>\n

\u53e6\u8bf7\u6ce8\u610f\uff0c\u60a8\u4f7f\u7528\u7684\u662f\u975e\u5e38\u65e7\u7684\u4e0d\u53d7\u652f\u6301<\/em>\u7248\u672c\u7684 Go\uff0c \u5728 Go 1.16 \u4e2d\uff0cmadvise<\/code> \u7684\u884c\u4e3a\u518d\u6b21\u51fa\u73b0\uff0c\u56e0\u6b64\u5b83\u518d\u6b21\u4f7f\u7528 MADV_DONTNEED<\/code>\u3002 \u4e5f\u8bb8\u73b0\u5728\u662f\u5347\u7ea7\u7684\u597d\u65f6\u673a\u3002<\/p>\n

\u00b9 \u5b9e\u9645\u4e0a\u6bd4\u8fd9\u66f4\u590d\u6742\uff0c\u56e0\u4e3a OOM \u6740\u624b\u6709\u4e00\u7ec4\u542f\u53d1\u5f0f\u65b9\u6cd5\u7528\u4e8e\u67e5\u627e\u201c\u8d44\u6e90\u5360\u7528\u8005\u201d\uff0c\u800c\u5185\u5b58\u6d88\u8017\u53ea\u662f\u5b83\u8003\u8651\u7684\u6307\u6807\u4e4b\u4e00\u3002<\/p>\n

\u4eca\u5929\u5173\u4e8e\u300a\u4e3a\u4ec0\u4e48Golang MADV_FREE\u6709\u65f6\u4f1a\u5bfc\u81f4OOM\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207453","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207453","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=207453"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207453\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207453"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207453"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207453"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}