{"id":37309,"date":"2023-12-11T14:40:57","date_gmt":"2023-12-11T06:40:57","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37309"},"modified":"2023-12-11T14:40:57","modified_gmt":"2023-12-11T06:40:57","slug":"%e4%bb%8b%e7%bb%8d%e4%b8%80%e4%b8%8bcmsg1%e6%94%b6%e9%9b%86%e5%99%a8%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/%e4%bb%8b%e7%bb%8d%e4%b8%80%e4%b8%8bcmsg1%e6%94%b6%e9%9b%86%e5%99%a8%ef%bc%9f\/","title":{"rendered":"\u4ecb\u7ecd\u4e00\u4e0bCMS,G1\u6536\u96c6\u5668\uff1f"},"content":{"rendered":"

“`”<\/p>\n

<h3>1 CMS \u6536\u96c6\u5668<\/h3><\/p>\n

<strong>CMS\uff08Concurrent Mark Sweep\uff09\u6536\u96c6\u5668\u662f\u4e00\u79cd\u4ee5\u83b7\u53d6\u6700\u77ed\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807\u7684\u6536\u96c6\u5668\u3002\u5b83\u975e\u5e38\u7b26\u5408\u5728\u6ce8\u91cd\u7528\u6237\u4f53\u9a8c\u7684\u5e94\u7528\u4e0a\u4f7f\u7528\u3002<\/strong><\/p>\n

<strong>CMS\uff08Concurrent Mark Sweep\uff09\u6536\u96c6\u5668\u662f HotSpot \u865a\u62df\u673a\u7b2c\u4e00\u6b3e\u771f\u6b63\u610f\u4e49\u4e0a\u7684\u5e76\u53d1\u6536\u96c6\u5668\uff0c\u5b83\u7b2c\u4e00\u6b21\u5b9e\u73b0\u4e86\u8ba9\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u4e0e\u7528\u6237\u7ebf\u7a0b\uff08\u57fa\u672c\u4e0a\uff09\u540c\u65f6\u5de5\u4f5c\u3002<\/strong><\/p>\n

\u4ece\u540d\u5b57\u4e2d\u7684<strong>Mark Sweep<\/strong>\u8fd9\u4e24\u4e2a\u8bcd\u53ef\u4ee5\u770b\u51fa\uff0cCMS \u6536\u96c6\u5668\u662f\u4e00\u79cd <strong>\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5<\/strong>\u5b9e\u73b0\u7684\uff0c\u5b83\u7684\u8fd0\u4f5c\u8fc7\u7a0b\u76f8\u6bd4\u4e8e\u524d\u9762\u51e0\u79cd\u5783\u573e\u6536\u96c6\u5668\u6765\u8bf4\u66f4\u52a0\u590d\u6742\u4e00\u4e9b\u3002\u6574\u4e2a\u8fc7\u7a0b\u5206\u4e3a\u56db\u4e2a\u6b65\u9aa4\uff1a<\/p><\/p>\n

<ul><li><strong>\u521d\u59cb\u6807\u8bb0\uff1a<\/strong> \u6682\u505c\u6240\u6709\u7684\u5176\u4ed6\u7ebf\u7a0b\uff0c\u5e76\u8bb0\u5f55\u4e0b\u76f4\u63a5\u4e0e root \u76f8\u8fde\u7684\u5bf9\u8c61\uff0c\u901f\u5ea6\u5f88\u5feb \uff1b<\/li><li><strong>\u5e76\u53d1\u6807\u8bb0\uff1a<\/strong> \u540c\u65f6\u5f00\u542f GC \u548c\u7528\u6237\u7ebf\u7a0b\uff0c\u7528\u4e00\u4e2a\u95ed\u5305\u7ed3\u6784\u53bb\u8bb0\u5f55\u53ef\u8fbe\u5bf9\u8c61\u3002\u4f46\u5728\u8fd9\u4e2a\u9636\u6bb5\u7ed3\u675f\uff0c\u8fd9\u4e2a\u95ed\u5305\u7ed3\u6784\u5e76\u4e0d\u80fd\u4fdd\u8bc1\u5305\u542b\u5f53\u524d\u6240\u6709\u7684\u53ef\u8fbe\u5bf9\u8c61\u3002\u56e0\u4e3a\u7528\u6237\u7ebf\u7a0b\u53ef\u80fd\u4f1a\u4e0d\u65ad\u7684\u66f4\u65b0\u5f15\u7528\u57df\uff0c\u6240\u4ee5 GC \u7ebf\u7a0b\u65e0\u6cd5\u4fdd\u8bc1\u53ef\u8fbe\u6027\u5206\u6790\u7684\u5b9e\u65f6\u6027\u3002\u6240\u4ee5\u8fd9\u4e2a\u7b97\u6cd5\u91cc\u4f1a\u8ddf\u8e2a\u8bb0\u5f55\u8fd9\u4e9b\u53d1\u751f\u5f15\u7528\u66f4\u65b0\u7684\u5730\u65b9\u3002<\/li><li><strong>\u91cd\u65b0\u6807\u8bb0\uff1a<\/strong> \u91cd\u65b0\u6807\u8bb0\u9636\u6bb5\u5c31\u662f\u4e3a\u4e86\u4fee\u6b63\u5e76\u53d1\u6807\u8bb0\u671f\u95f4\u56e0\u4e3a\u7528\u6237\u7a0b\u5e8f\u7ee7\u7eed\u8fd0\u884c\u800c\u5bfc\u81f4\u6807\u8bb0\u4ea7\u751f\u53d8\u52a8\u7684\u90a3\u4e00\u90e8\u5206\u5bf9\u8c61\u7684\u6807\u8bb0\u8bb0\u5f55\uff0c\u8fd9\u4e2a\u9636\u6bb5\u7684\u505c\u987f\u65f6\u95f4\u4e00\u822c\u4f1a\u6bd4\u521d\u59cb\u6807\u8bb0\u9636\u6bb5\u7684\u65f6\u95f4\u7a0d\u957f\uff0c\u8fdc\u8fdc\u6bd4\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\u65f6\u95f4\u77ed<\/li><li><strong>\u5e76\u53d1\u6e05\u9664\uff1a<\/strong> \u5f00\u542f\u7528\u6237\u7ebf\u7a0b\uff0c\u540c\u65f6 GC \u7ebf\u7a0b\u5f00\u59cb\u5bf9\u4e3a\u6807\u8bb0\u7684\u533a\u57df\u505a\u6e05\u626b\u3002<\/li><\/ul><\/p>\n

<br><\/p>\n

<img src=""http:\/\/res.mianshigee.com\/upload\/article\/20200414\/a8445398-e010-4864-82e2-41e2095c2b33.jpg"" style=""width: 597px;""><\/p>\n

<br><\/p>\n

\u4ece\u5b83\u7684\u540d\u5b57\u5c31\u53ef\u4ee5\u770b\u51fa\u5b83\u662f\u4e00\u6b3e\u4f18\u79c0\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u4e3b\u8981\u4f18\u70b9\uff1a<strong>\u5e76\u53d1\u6536\u96c6\u3001\u4f4e\u505c\u987f<\/strong>\u3002\u4f46\u662f\u5b83\u6709\u4e0b\u9762\u4e09\u4e2a\u660e\u663e\u7684\u7f3a\u70b9\uff1a<\/p>\n

<ul><li><strong>\u5bf9 CPU \u8d44\u6e90\u654f\u611f\uff1b<\/strong><\/li><li><strong>\u65e0\u6cd5\u5904\u7406\u6d6e\u52a8\u5783\u573e\uff1b<\/strong><\/li><li><strong>\u5b83\u4f7f\u7528\u7684\u56de\u6536\u7b97\u6cd5-\u201c\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5\u4f1a\u5bfc\u81f4\u6536\u96c6\u7ed3\u675f\u65f6\u4f1a\u6709\u5927\u91cf\u7a7a\u95f4\u788e\u7247\u4ea7\u751f\u3002<\/strong><\/li><\/ul><\/p>\n

<h3>2 G1 \u6536\u96c6\u5668<\/h3><\/p>\n

<strong>G1 (Garbage-First) \u662f\u4e00\u6b3e\u9762\u5411\u670d\u52a1\u5668\u7684\u5783\u573e\u6536\u96c6\u5668,\u4e3b\u8981\u9488\u5bf9\u914d\u5907\u591a\u9897\u5904\u7406\u5668\u53ca\u5927\u5bb9\u91cf\u5185\u5b58\u7684\u673a\u5668. \u4ee5\u6781\u9ad8\u6982\u7387\u6ee1\u8db3 GC \u505c\u987f\u65f6\u95f4\u8981\u6c42\u7684\u540c\u65f6,\u8fd8\u5177\u5907\u9ad8\u541e\u5410\u91cf\u6027\u80fd\u7279\u5f81.<\/strong><\/p>\n

\u88ab\u89c6\u4e3a JDK1.7 \u4e2d HotSpot \u865a\u62df\u673a\u7684\u4e00\u4e2a\u91cd\u8981\u8fdb\u5316\u7279\u5f81\u3002\u5b83\u5177\u5907\u4e00\u4e0b\u7279\u70b9\uff1a<\/p>\n

<ul><li><strong>\u5e76\u884c\u4e0e\u5e76\u53d1<\/strong>\uff1aG1 \u80fd\u5145\u5206\u5229\u7528 CPU\u3001\u591a\u6838\u73af\u5883\u4e0b\u7684\u786c\u4ef6\u4f18\u52bf\uff0c\u4f7f\u7528\u591a\u4e2a CPU\uff08CPU \u6216\u8005 CPU \u6838\u5fc3\uff09\u6765\u7f29\u77ed Stop-The-World \u505c\u987f\u65f6\u95f4\u3002\u90e8\u5206\u5176\u4ed6\u6536\u96c6\u5668\u539f\u672c\u9700\u8981\u505c\u987f Java \u7ebf\u7a0b\u6267\u884c\u7684 GC \u52a8\u4f5c\uff0cG1 \u6536\u96c6\u5668\u4ecd\u7136\u53ef\u4ee5\u901a\u8fc7\u5e76\u53d1\u7684\u65b9\u5f0f\u8ba9 java \u7a0b\u5e8f\u7ee7\u7eed\u6267\u884c\u3002<\/li><li><strong>\u5206\u4ee3\u6536\u96c6<\/strong>\uff1a\u867d\u7136 G1 \u53ef\u4ee5\u4e0d\u9700\u8981\u5176\u4ed6\u6536\u96c6\u5668\u914d\u5408\u5c31\u80fd\u72ec\u7acb\u7ba1\u7406\u6574\u4e2a GC \u5806\uff0c\u4f46\u662f\u8fd8\u662f\u4fdd\u7559\u4e86\u5206\u4ee3\u7684\u6982\u5ff5\u3002<\/li><li><strong>\u7a7a\u95f4\u6574\u5408<\/strong>\uff1a\u4e0e CMS \u7684\u201c\u6807\u8bb0–\u6e05\u7406\u201d\u7b97\u6cd5\u4e0d\u540c\uff0cG1 \u4ece\u6574\u4f53\u6765\u770b\u662f\u57fa\u4e8e\u201c\u6807\u8bb0\u6574\u7406\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\u6536\u96c6\u5668\uff1b\u4ece\u5c40\u90e8\u4e0a\u6765\u770b\u662f\u57fa\u4e8e\u201c\u590d\u5236\u201d\u7b97\u6cd5\u5b9e\u73b0\u7684\u3002<\/li><li><strong>\u53ef\u9884\u6d4b\u7684\u505c\u987f<\/strong>\uff1a\u8fd9\u662f G1 \u76f8\u5bf9\u4e8e CMS \u7684\u53e6\u4e00\u4e2a\u5927\u4f18\u52bf\uff0c\u964d\u4f4e\u505c\u987f\u65f6\u95f4\u662f G1 \u548c CMS \u5171\u540c\u7684\u5173\u6ce8\u70b9\uff0c\u4f46 G1 \u9664\u4e86\u8ffd\u6c42\u4f4e\u505c\u987f\u5916\uff0c\u8fd8\u80fd\u5efa\u7acb\u53ef\u9884\u6d4b\u7684\u505c\u987f\u65f6\u95f4\u6a21\u578b\uff0c\u80fd\u8ba9\u4f7f\u7528\u8005\u660e\u786e\u6307\u5b9a\u5728\u4e00\u4e2a\u957f\u5ea6\u4e3a M \u6beb\u79d2\u7684\u65f6\u95f4\u7247\u6bb5\u5185\u3002<\/li><\/ul><\/p>\n

G1 \u6536\u96c6\u5668\u7684\u8fd0\u4f5c\u5927\u81f4\u5206\u4e3a\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n

<ul><li><strong>\u521d\u59cb\u6807\u8bb0<\/strong><\/li><li><strong>\u5e76\u53d1\u6807\u8bb0<\/strong><\/li><li><strong>\u6700\u7ec8\u6807\u8bb0<\/strong><\/li><li><strong>\u7b5b\u9009\u56de\u6536<\/strong><\/li><\/ul><\/p>\n

<strong>G1 \u6536\u96c6\u5668\u5728\u540e\u53f0\u7ef4\u62a4\u4e86\u4e00\u4e2a\u4f18\u5148\u5217\u8868\uff0c\u6bcf\u6b21\u6839\u636e\u5141\u8bb8\u7684\u6536\u96c6\u65f6\u95f4\uff0c\u4f18\u5148\u9009\u62e9\u56de\u6536\u4ef7\u503c\u6700\u5927\u7684 Region(\u8fd9\u4e5f\u5c31\u662f\u5b83\u7684\u540d\u5b57 Garbage-First \u7684\u7531\u6765)<\/strong>\u3002\u8fd9\u79cd\u4f7f\u7528 Region \u5212\u5206\u5185\u5b58\u7a7a\u95f4\u4ee5\u53ca\u6709\u4f18\u5148\u7ea7\u7684\u533a\u57df\u56de\u6536\u65b9\u5f0f\uff0c\u4fdd\u8bc1\u4e86 GF \u6536\u96c6\u5668\u5728\u6709\u9650\u65f6\u95f4\u5185\u53ef\u4ee5\u5c3d\u53ef\u80fd\u9ad8\u7684\u6536\u96c6\u6548\u7387\uff08\u628a\u5185\u5b58\u5316\u6574\u4e3a\u96f6\uff09\u3002<\/p>\n

<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"

“`” <h3>1 CMS \u6536\u96c6\u5668<\/h3> <stro […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37309","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37309","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37309"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37309\/revisions"}],"predecessor-version":[{"id":37310,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37309\/revisions\/37310"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37309"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37309"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37309"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}