{"id":19,"date":"2022-11-06T00:51:09","date_gmt":"2022-11-05T16:51:09","guid":{"rendered":"http:\/\/codermr.com\/?p=19"},"modified":"2023-03-25T23:36:21","modified_gmt":"2023-03-25T15:36:21","slug":"talk_gc","status":"publish","type":"post","link":"http:\/\/codermr.com\/index.php\/2022\/11\/06\/talk_gc\/","title":{"rendered":"\u804a\u804a\u300c\u5783\u573e\u56de\u6536\u300d"},"content":{"rendered":"\n<p id=\"block-b221bccb-9799-4006-bffc-6a007ee1b1d1\">\u4eca\u5929\u4e2d\u5348\u905b\u5f2f\u7684\u65f6\u5019\uff0c\u53c8\u601d\u8003\u4e86\u4e00\u4e0b JVM\u300e\u5783\u573e\u56de\u6536\u300f\u7684\u8fc7\u7a0b\u3002\u601d\u8003\u7684\u8fc7\u7a0b\u5e2e\u52a9\u6211\u66f4\u6df1\u5165\u7684\u7406\u89e3\u4e86 JVM \u300e\u5783\u573e\u56de\u6536\u300f\u7684\u539f\u7406\uff0c\u5728\u6b64\u8bb0\u5f55\u4e00\u4e0b\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p id=\"block-c4a0754e-ab78-40ab-afe3-350ffff0f2a9\">HotSpot 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\u7684 Survivor \u533a\uff0cSurvivor \u533a \u201cTo\u201d \u662f\u7a7a\u7684\u3002\u7d27\u63a5\u7740\u8fdb\u884c GC\uff0cEden \u533a\u4e2d\u6240\u6709\u5b58\u6d3b\u7684\u5bf9\u8c61\u90fd\u4f1a\u88ab\u590d\u5236\u5230 \u201cTo\u201d\uff0c\u800c\u5728 \u201cFrom\u201d \u533a\u4e2d\uff0c\u4ecd\u5b58\u6d3b\u7684\u5bf9\u8c61\u4f1a\u6839\u636e\u4ed6\u4eec\u7684\u5e74\u9f84\u503c\u6765\u51b3\u5b9a\u53bb\u5411\u3002\u5e74\u9f84\u8fbe\u5230\u4e00\u5b9a\u503c(\u5e74\u9f84\u9608\u503c\uff0c\u53ef\u4ee5\u901a\u8fc7-XX:MaxTenuringThreshold\u6765\u8bbe\u7f6e)\u7684\u5bf9\u8c61\u4f1a\u88ab\u79fb\u52a8\u5230\u5e74\u8001\u4ee3\u4e2d\uff0c\u6ca1\u6709\u8fbe\u5230\u9608\u503c\u7684\u5bf9\u8c61\u4f1a\u88ab\u590d\u5236\u5230 \u201cTo\u201d \u533a\u57df\u3002\u7ecf\u8fc7\u8fd9\u6b21 GC \u540e\uff0cEden \u533a\u548c From \u533a\u5df2\u7ecf\u88ab\u6e05\u7a7a\u3002\u8fd9\u4e2a\u65f6\u5019\uff0c\u201cFrom\u201d \u548c \u201cTo\u201d \u4f1a\u4ea4\u6362\u4ed6\u4eec\u7684\u89d2\u8272\uff0c\u4e5f\u5c31\u662f\u65b0\u7684 \u201cTo\u201d \u5c31\u662f\u4e0a\u6b21 GC \u524d\u7684 \u201cFrom\u201d\uff0c\u65b0\u7684 \u201cFrom\u201d \u5c31\u662f\u4e0a\u6b21 GC \u524d\u7684 \u201cTo\u201d\u3002\u4e0d\u7ba1\u600e\u6837\uff0c\u90fd\u4f1a\u4fdd\u8bc1\u540d\u4e3a To \u7684 Survivor \u533a\u57df\u662f\u7a7a\u7684\u3002Minor GC \u4f1a\u4e00\u76f4\u91cd\u590d\u8fd9\u6837\u7684\u8fc7\u7a0b\uff0c\u76f4\u5230 \u201cTo\u201d \u533a\u88ab\u586b\u6ee1\uff0c\u201cTo\u201d \u533a\u88ab\u586b\u6ee1\u4e4b\u540e\uff0c\u4f1a\u5c06\u6240\u6709\u5bf9\u8c61\u79fb\u52a8\u5230\u5e74\u8001\u4ee3\u4e2d\u3002<\/p>\n<\/blockquote>\n\n\n\n<p id=\"block-f6924c09-19fb-4b44-8c52-edcb96f91262\">\u4ee5\u4e0a\u662f JVM \u5783\u573e\u56de\u6536\u7684\u5927\u81f4\u8fc7\u7a0b\uff0c\u4e0d\u77e5\u9053\u4f60\u80fd\u4e0d\u80fd\u7acb\u523b\u7b54\u4e0a\u6765\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" 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id=\"block-497fa825-c182-4a18-b95f-56699501ae83\">\u5f53\u6211\u4eec\u5df2\u7ecf\u77e5\u9053\u54ea\u4e9b\u5bf9\u8c61\u9700\u8981\u56de\u6536\u4e86\uff0c\u4e0b\u4e00\u6b65\u5c31\u662f\u627e\u5230\u8fd9\u4e9b\u5bf9\u8c61\uff0c\u7136\u540e\u56de\u6536\u6389\u5b83\u4eec\u5360\u7528\u7684\u7a7a\u95f4\uff0c\u300e\u627e\u5230\u8fd9\u4e9b\u5bf9\u8c61\u300f\u8fd9\u4e2a\u8fc7\u7a0b\u53ef\u4e0d\u662f\u90a3\u4e48\u8f7b\u677e\u7684\uff0c\u5982\u679c\u6211\u4eec\u521b\u5efa\u7684\u5bf9\u8c61\u7684\u5730\u5740\u5728\u5185\u5b58\u4e2d\u662f\u968f\u673a\u7684\uff0c\u5219\u5bfb\u627e\u8fd9\u4e9b\u4f4d\u7f6e\u968f\u673a\u7684\u5bf9\u8c61\u5c31\u975e\u5e38\u8017\u65f6\u3002\u6bd4\u5982\u5bf9\u4e8e\u4e00\u5757 16G \u7684\u5185\u5b58\uff0c\u5047\u8bbe JVM \u4e2d\u5806\u5185\u5b58\u4f7f\u7528 4G \uff0c\u5728 4G \u5185\u5b58\u4e2d\u627e\u5230\u8fd9\u4e48\u591a\u96f6\u788e\u7684\u5bf9\u8c61\uff0c\u4f9d\u7136\u662f\u4e00\u4ef6\u6bd4\u8f83\u8017\u65f6\u7684\u5de5\u4f5c\u3002<\/p>\n\n\n\n<p id=\"block-b740e1af-3485-40f4-915c-9db15c6fcc4c\">\u90a3\u4e48\uff0c\u6211\u4eec\u53ef\u4ee5\u8003\u8651\uff0c\u5c06 4G \u7684\u5806\u5185\u5b58\uff0c\u5212\u5206\u51fa\u6765\u5730\u5740\u8fde\u7eed\u7684\u4e00\u5757\u5185\u5b58\uff08\u5185\u5b58\u5757 A \uff09\uff0c\u4e13\u95e8\u5b58\u653e\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\uff0c\u5b9a\u65f6\u4efb\u52a1\u6bcf\u9694\u4e00\u6bb5\u65f6\u95f4\u5c31\u626b\u63cf\u8fd9\u4e2a\u5185\u5b58\u5757A\uff0c\u770b Map \u4e2d\u54ea\u4e9b\u5bf9\u8c61\u8be5\u56de\u6536\u4e86\u3002<\/p>\n\n\n\n<p id=\"block-675e8f5f-1b93-469b-bfc2-bbc94e878f9b\">\u4f46\u662f\uff0c\u8fd9\u79cd\u5b9e\u73b0\u65b9\u6cd5\u8fd8\u662f\u4e0d\u591f\u597d\u3002JVM \u4e2d\u5927\u591a\u6570\u5bf9\u8c61\u90fd\u662f\u751f\u547d\u5468\u671f\u5f88\u77ed\u7684\uff0c\u5b9a\u65f6\u4efb\u52a1\u6bcf\u6b21\u626b\u63cf\u5230\u9700\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u5c31\u8fdb\u884c\u56de\u6536\u540c\u65f6 STW \uff0c\u5219 JVM \u7684\u6548\u7387\u5f97\u6709\u591a\u5dee\u5462\u3002\u5fc5\u987b\u51cf\u5c11 STW \u7684\u6b21\u6570\u3002<\/p>\n\n\n\n<p id=\"block-0b675f33-63eb-4430-94de-8b2dac45779f\">\u6240\u4ee5\uff0c\u6211\u4eec\u518d\u601d\u8003\u4e00\u4e0b\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n\n\n\n<p id=\"block-f8b6408f-b7a3-45f1-8b59-101d0c11ad70\">\u6211\u4eec\u53ef\u4ee5\u5212\u5206\u51fa\u6765\u4e00\u6574\u5757\u5730\u5740\u8fde\u7eed\u7684\u5185\u5b58\u5757 B \uff0c\u5b9a\u65f6\u4efb\u52a1\u6bcf\u6b21\u626b\u63cf\u5230\u5185\u5b58\u5757 A \u4e2d\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u5148\u4e0d\u56de\u6536\uff0c\u5148\u653e\u5230\u5185\u5b58\u5757 B \u4e2d\uff0c\u7b49\u5230\u5185\u5b58\u5757 B \u7a7a\u95f4\u6ee1\u4e86\uff0c\u518d\u4e00\u6b21\u6027\u5c06\u5185\u5b58\u5757 B \u56de\u6536\u6389\uff0c\u8fd9\u6837\u6548\u7387\u5c82\u4e0d\u662f\u9ad8\u591a\u4e86\u3002<\/p>\n\n\n\n<p id=\"block-a97cf344-5807-4f2c-9dcb-c36bd1f9c577\">\u4f46\u4f7f\u7528\u5b9a\u65f6\u4efb\u52a1\uff0c\u6548\u7387\u4e0a\u8fd8\u662f\u6709\u70b9\u4f4e\uff0c\u6211\u4eec\u80fd\u4e0d\u80fd\u5316\u88ab\u52a8\u4e3a\u4e3b\u52a8\uff0c\u4e0d\u7528\u5b9a\u65f6\u4efb\u52a1\u626b\u63cf\uff0c\u800c\u662f\u5f53\u8fbe\u5230\u67d0\u4e2a\u6761\u4ef6\u65f6\uff0c\u518d\u53bb\u67e5\u8be2\u54ea\u4e9b\u5bf9\u8c61\u8be5\u56de\u6536\u4e86\u3002<\/p>\n\n\n\n<p id=\"block-b852d029-bb8a-4417-a777-5d75a5ddc038\">\u6bd4\u5982\u8bf4\uff0c\u5f53\u5185\u5b58\u5757 A \u6ee1\u4e86\u7684\u65f6\u5019\uff0c\u518d\u67e5\u8be2\u5185\u5b58\u5757 A \u4e2d\u54ea\u4e9b\u5bf9\u8c61\u8be5\u56de\u6536\u4e86\uff0c\u8fd9\u6837\u5c31\u907f\u514d\u4e86\u5b9a\u65f6\u4efb\u52a1\u3002\u8fd9\u6837\u4e5f\u5c31\u4e0d\u7528\u518d\u5c06\u8be5\u56de\u6536\u7684\u5bf9\u8c61\u590d\u5236\u5230\u5185\u5b58\u5757 B \u4e86\uff0c\u800c\u662f\u53ef\u4ee5\u76f4\u63a5\u56de\u6536\u6389\u3002=\u300b\u8fd9\u6837\u4f3c\u4e4e\u4e0d\u9700\u8981\u5185\u5b58\u5757 B \u4e86\u3002\u4f46\u662f\u6709\u4e2a\u95ee\u9898\uff0c\u5185\u5b58\u5757 A \u4e00\u76f4\u6709\u5bf9\u8c61\u4ea7\u751f\uff0c\u65f6\u95f4\u957f\u4e86\uff0c\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\u3002=\u300b\u6240\u4ee5\u8fd8\u662f\u8fd9\u6837\u6bd4\u8f83\u597d\u70b9\uff1a\u6bcf\u6b21\u5185\u5b58\u5757 A \u6ee1\u4e86\u7684\u65f6\u5019\uff0c\u5c06\u8be5\u56de\u6536\u7684\u5bf9\u8c61\u56de\u6536\u6389\uff0c\u7136\u540e\u5c06\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230\u5185\u5b58\u5757 B \uff0c\u8fd9\u6837\u6bcf\u6b21\u5783\u573e\u56de\u6536\uff0c\u5185\u5b58\u5757 A \u5c31\u5e72\u51c0\u4e86\uff0c\u4e5f\u907f\u514d\u4e86\u5185\u5b58\u788e\u7247\u4ea7\u751f\u3002\u540c\u65f6\u6bcf\u6b21\u5783\u573e\u56de\u6536\uff0c\u4e5f\u4f1a\u68c0\u67e5\u5185\u5b58\u5757 B \u4e2d\u7684\u5bf9\u8c61\u54ea\u4e9b\u8be5\u56de\u6536\u4e86\uff0c\u5c06\u8be5\u56de\u6536\u7684\u5bf9\u8c61\u56de\u6536\u6389\u3002==\u300b\u90a3\u65f6\u95f4\u957f\u4e86\uff0c\u5185\u5b58\u5757 B \u5c82\u4e0d\u4e5f\u4f1a\u4ea7\u751f\u5185\u5b58\u788e\u7247\uff1f==\u300b\u597d\u5427\uff0c\u6211\u4eec\u518d\u5b9a\u4e49\u4e00\u4e2a\u5185\u5b58\u5757 C \uff0c\u6bcf\u6b21\u5783\u573e\u56de\u6536\uff0c\u5c06\u5185\u5b58\u5757 B \u548c\u5185\u5b58\u5757 C \u8fdb\u884c\u4ea4\u4e92\uff0c\u5373\u5c06 B \u4e2d\u8fd8\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230 C \u4e2d\uff0c\u7136\u540e\u4ea4\u6362 B \u548c C \u7684\u89d2\u8272\u3002==\u300b\u8fd9\u79cd\u5185\u5b58\u5757\u590d\u5236\u7684\u65b9\u5f0f\u5c31\u907f\u514d\u4e86\u5185\u5b58\u788e\u7247\u7684\u4ea7\u751f\u3002\uff08\u56e0\u4e3a B \u4e2d\u7684\u5bf9\u8c61\u53ef\u80fd\u662f\u7410\u788e\u7684\uff0c\u590d\u5236\u5230 C \u4e2d\u4e4b\u540e\u5c31\u662f\u5730\u5740\u8fde\u7eed\u7684\u4e86\uff09<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p id=\"block-2e8cd636-3933-45c0-985f-2e64f13e6810\"><strong>\u5185\u5b58\u788e\u7247<\/strong>\uff1a\u5185\u5b58\u788e\u7247\u63cf\u8ff0\u4e00\u4e2a\u7cfb\u7edf\u4e2d\u6240\u6709\u4e0d\u53ef\u7528\u7684\u7a7a\u95f2\u5185\u5b58\uff0c\u8fd9\u4e9b\u788e\u7247\u4e4b\u6240\u4ee5\u4e0d\u80fd\u88ab\u4f7f\u7528\uff0c\u662f\u56e0\u4e3a\u8fd9\u4e9b\u7a7a\u95f2\u5185\u5b58\u592a\u5c0f\u4e14\u4ee5\u4e0d\u8fde\u7eed\u65b9\u5f0f\u51fa\u73b0\u5728\u4e0d\u540c\u7684\u4f4d\u7f6e\u3002<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\" id=\"block-82acf6dd-7359-4f52-baa8-130363a0774d\"\/>\n\n\n\n<p id=\"block-447b2a9f-a4e2-4c41-ab76-5e4f50801c22\">\u597d\u4e86\uff0c\u6700\u540e\u8ba9\u6211\u4eec\u770b\u770b JVM \u5185\u5b58\u56de\u6536\u7684\u8fc7\u7a0b\uff0c\u662f\u4e0d\u662f\u5c31\u66f4\u6e05\u6670\u4e86\u5462\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p id=\"block-9c068f8c-4126-4741-a4ac-04926d0a8d17\">HotSpot JVM\u628a\u5e74\u8f7b\u4ee3\u5206\u4e3a\u4e86\u4e09\u90e8\u5206\uff1a1\u4e2a Eden \u533a\u548c2\u4e2a Survivor \u533a\uff08\u5206\u522b\u53eb from \u548c to \uff09\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u90fd\u4f1a\u88ab\u5206\u914d\u5230 Eden \u533a(\u4e00\u4e9b\u5927\u5bf9\u8c61\u7279\u6b8a\u5904\u7406),\u8fd9\u4e9b\u5bf9\u8c61\u7ecf\u8fc7\u7b2c\u4e00\u6b21 Minor GC \u540e\uff0c\u5982\u679c\u4ecd\u7136\u5b58\u6d3b\uff0c\u5c06\u4f1a\u88ab\u79fb\u5230 Survivor \u533a\u3002\u5bf9\u8c61\u5728Survivor\u533a\u4e2d\u6bcf\u71ac\u8fc7\u4e00\u6b21 Minor GC\uff0c\u5e74\u9f84\u5c31\u4f1a\u589e\u52a01\u5c81\uff0c\u5f53\u5b83\u7684\u5e74\u9f84\u589e\u52a0\u5230\u4e00\u5b9a\u7a0b\u5ea6\u65f6\uff0c\u5c31\u4f1a\u88ab\u79fb\u52a8\u5230\u5e74\u8001\u4ee3\u4e2d\u3002<\/p>\n\n\n\n<p id=\"block-ae86a7d5-e5ff-426e-acb6-452246c55c04\">\u5728 GC 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