{"id":4191,"date":"2019-04-29T11:44:18","date_gmt":"2019-04-29T03:44:18","guid":{"rendered":"http:\/\/www.xttblog.com\/?p=4191"},"modified":"2019-04-29T11:44:18","modified_gmt":"2019-04-29T03:44:18","slug":"%e9%9d%a2%e8%af%95%e5%bf%85%e9%97%ae%e7%9a%84-major-gc-%e4%bd%a0%e4%ba%86%e8%a7%a3%e4%b8%80%e4%b8%8b","status":"publish","type":"post","link":"https:\/\/www.xttblog.com\/?p=4191","title":{"rendered":"\u9762\u8bd5\u5fc5\u95ee\u7684 Major Gc \u4f60\u4e86\u89e3\u4e00\u4e0b"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u524d\u9762\u6211\u5199\u4e86\u4e00\u7bc7\u5173\u4e8e Minor Gc \u7684\u6587\u7ae0\uff0c\u770b\u5f97\u4eba\u867d\u7136\u4e0d\u591a\uff0c\u4f46\u662f\u5f88\u591a\u4eba\u7684\u8bc4\u8bba\u7ed9\u6211\u7559\u4e0b\u4e86\u6df1\u523b\u7684\u5370\u8c61\u3002\u4eca\u5929\u6211\u4eec\u7ee7\u7eed\u8fdb\u6b65\uff0c\u5b66\u4e60\u4e00\u4e0b Major Gc\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u4e8e Major Gc\uff0c\u5f88\u5c11\u6709\u4e66\u7c4d\u6216\u8005\u6587\u7ae0\u6765\u5355\u72ec\u5199\u5b83\u3002\u5927\u591a\u6570\u90fd\u662f\u628a\u5b83\u548c Minor Gc\u3001Full Gc \u653e\u5728\u4e00\u8d77\u6765\u5199\uff0cMajor Gc \u57fa\u672c\u4e0a\u662f\u4e00\u7b14\u5e26\u8fc7\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u53c2\u8003\u56fd\u5916\u7684\u4e00\u4e9b\u6587\u7ae0\uff0cMajor Gc \u4e3b\u8981\u662f\u7528\u6765\u56de\u6536\u8001\u5e74\u4ee3\u7684\u3002\u73b0\u5728\u7684 Gc \u57fa\u672c\u4e0a\u90fd\u662f\u91c7\u7528\u5206\u4ee3\u56de\u6536\u7684\uff0c\u5305\u62ec G1 \u7684\u6309\u533a\u57df\u56de\u6536\uff0c\u5176\u5b9e\u4e5f\u662f\u5206\u4ee3\u601d\u60f3\u3002\u5e74\u8f7b\u4ee3\u7531 Minor Gc \u8fdb\u884c\u56de\u6536\uff0c\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u3002Major Gc \u4e3b\u8981\u56de\u6536\u8001\u5e74\u4ee3\u533a\u57df\uff0c\u91c7\u7528\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u3002Full Gc \u56de\u6536\u6574\u4e2a\u5806\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MinorGC(\u6b21\u8981\u7684) \u53d1\u751f\u56de\u6536\u7684\u65f6\u5019\uff0c\u5f80\u5f80\u4e5f\u53ef\u4ee5\u4f34\u968f\u7740 MajorGC \u7684\u53d1\u751f\u3002\u56e0\u4e3a\uff0c\u8fd9\u65f6\u6709\u4e9b\u5bf9\u8c61\u4f1a\u88ab\u79fb\u52a8\u5230\u8001\u5e74\u4ee3\u4e2d\uff0c\u5f53\u8001\u5e74\u4ee3\u7684\u7a7a\u95f4\u4e0d\u591f\u4e86\uff0c\u5c31\u53ef\u80fd\u53d1\u751f MajorGC(\u91cd\u8981\u7684) \u3002MajorGC \u901f\u5ea6\u6bd4 Minor GC \u6162 10 \u500d\u4ee5\u4e0a\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">MajorGC \u5728\u53d1\u751f\u65f6\uff0c\u4e00\u822c\u91c7\u7528\u4e24\u6b21\u6807\u8bb0\u3002\u4e00\u4e2a\u5bf9\u8c61\u88ab\u771f\u6b63\u5224\u5b9a\u4e3a\u201c\u6b7b\u4ea1\u201d\uff0c\u9700\u8981\u8fdb\u884c\u4e24\u6b21\u6807\u8bb0\uff08\u88ab\u6807\u8bb0\u4e3a\u53ef\u56de\u6536\u5bf9\u8c61\uff09\uff0c\u7136\u540e\u5728\u4e0b\u4e00\u6b21 JVM \u8fdb\u884c GC \u7684\u65f6\u5019\uff0c\u624d\u88ab\u771f\u6b63\u7684\u56de\u6536\u6389\u3002\u5982\u679c\u4e00\u4e2a\u5bf9\u8c61\u6ca1\u6709\u4e0e GC Roots \u7684\u5f15\u7528\u94fe\u76f8\u8fde\u63a5\uff0c\u4e5f\u5e76\u6ca1\u6709\u88ab\u771f\u6b63\u5224\u5b9a\u4e3a\u201c\u6b7b\u4ea1\u201d\uff0c\u800c\u662f\u8fdb\u884c\u7b2c\u4e00\u6b21\u6807\u8bb0\uff0c\u7136\u540e\u5728\u7b2c\u4e8c\u6b21\u6807\u8bb0\u4e4b\u524d\u4f1a\u8fdb\u884c\u201c\u81ea\u6551\u201d\u8fc7\u7a0b\u3002\u6240\u8c13\u7684\u201c\u81ea\u6551\u201d\u5c31\u662f\u5728\u7b2c\u4e8c\u6b21\u88ab\u6807\u8bb0\u4e4b\u524d\uff0c\u9700\u8981\u91cd\u65b0\u4e0e\u5f15\u7528\u94fe\u76f8\u8fde\u63a5\u3002\u5728\u7b2c\u4e00\u6b21\u88ab\u6807\u8bb0\u540e\uff0c\u5bf9\u8c61\u4f1a\u8fdb\u884c\u7b5b\u9009\uff0c\u7b5b\u9009\u7684\u6761\u4ef6\u4e3a\u662f\u5426\u6709\u5fc5\u8981\u8fdb\u884c\u6267\u884c finalize() \u65b9\u6cd5\u3002\u5982\u679c\u6ca1\u6709\u5fc5\u8981\u6267\u884c finalize() \u65b9\u6cd5\uff0c\u5219\u5c31\u7b49\u5f85\u7b2c\u4e8c\u6b21\u88ab\u6807\u8bb0\uff1b\u5982\u679c\u6709\u5fc5\u8981\u6267\u884c finalize() \u65b9\u6cd5\uff0c\u5219\u4f1a\u5148\u5c06\u5bf9\u8c61\u653e\u7f6e\u5728\u4e00\u4e2a\u53eb F-Queue \u7684\u961f\u5217\u4e2d\uff0c\u7136\u540e\u7b49\u5f85\u865a\u62df\u673a\u901a\u8fc7Finalizer\u7ebf\u7a0b\u53bb\u89e6\u53d1\u5bf9\u8c61\u7684 finalize() \u65b9\u6cd5\uff0c\u7136\u540e\u5728 finalize() \u65b9\u6cd5\u91cc\u9762\uff0c\u5bf9\u8c61\u5c31\u5f00\u59cb\u81ea\u6551\u7684\u8fc7\u7a0b\u3002\u5bf9\u8c61\u81ea\u6551\u53ef\u4ee5\u901a\u8fc7\u628athis\u8d4b\u503c\u7ed9\u67d0\u4e2a\u7c7b\u53d8\u91cf\u6216\u8005\u5bf9\u8c61\u7684\u6210\u5458\u53d8\u91cf\uff0c\u5c31\u5b9e\u73b0\u4e86\u548c\u5f15\u7528\u94fe\u91cd\u65b0\u8fde\u63a5\u7684\u76ee\u7684\u2014\u2014\u81ea\u6551\u6210\u529f\u3002\u56e0\u6b64\u5728\u7b2c\u4e8c\u6b21\u6807\u8bb0\u7684\u65f6\u5019\u5c31\u4f1a\u628a\u5bf9\u8c61\u4ece F-Queue \u961f\u5217\u4e2d\u79fb\u9664\uff0c\u7136\u540e\u865a\u62df\u673a\u4f1a\u5728 F-Queue \u4e2d\u8fdb\u884c\u7b2c\u4e8c\u6b21\u5c0f\u89c4\u6a21\u7684\u6807\u8bb0\uff0c\u7136\u540e\u5c31\u7b49\u5f85\u4e0b\u4e00\u6b21 GC \u7684\u6765\u4e34\u3002<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/images.weserv.nl\/?url=https:\/\/wx1.sinaimg.cn\/large\/8fa5dcfcgy1g2jcsmw0sbj20in08baaf.jpg\" alt=\"\" \/><figcaption>&#8220;\u6807\u8bb0-\u6e05\u9664&#8221;\u7b97\u6cd5<\/figcaption><\/figure><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;\u6807\u8bb0-\u6e05\u9664&#8221;\u7b97\u6cd5\u662f\u6700\u57fa\u7840\u7684\u6536\u96c6\u7b97\u6cd5\u3002\u7b97\u6cd5\u5206\u4e3a&#8221;\u6807\u8bb0&#8221;\u548c&#8221;\u6e05\u9664&#8221;\u4e24\u4e2a\u9636\u6bb5\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6807\u8bb0\u51fa\u6240\u6709\u9700\u8981\u56de\u6536\u7684\u5bf9\u8c61\uff08\u904d\u5386\u5806\u6807\u8bb0\uff09\uff1b\u6807\u8bb0\u5b8c\u6210\u540e\u7edf\u4e00\u56de\u6536\u6240\u6709\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\uff08\u904d\u5386\u5806\u5220\u9664\uff09\uff1b&#8221;\u6807\u8bb0-\u6e05\u9664&#8221;\u7b97\u6cd5\u7684\u4e0d\u8db3\u4e4b\u5904\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&#8220;\u6807\u8bb0-\u6e05\u9664\u201d\u7b97\u6cd5\u7531\u4e24\u4e2a\u95ee\u9898\uff0c\u5927\u5bb6\u9700\u8981\u8bb0\u4f4f\u3002 <br><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u6548\u7387\u95ee\u9898:\u6807\u8bb0 \u548c \u6e05\u9664\u8fd9\u4e24\u4e2a\u8fc7\u7a0b\u6548\u7387\u90fd\u4e0d\u9ad8\u3002\n<\/li><li>\u7a7a\u95f4\u95ee\u9898:\u6807\u8bb0\u548c\u6e05\u9664\u540e\u4f1a\u4ea7\u751f\u5927\u91cf \u4e0d\u8fde\u7eed\u7684 \u5185\u5b58\u788e\u7247\uff0c\u7a7a\u95f4\u788e\u7247\u592a\u591a \u53ef\u80fd\u4f1a\u5bfc\u81f4 \u4ee5\u540e\u5728\u7a0b\u5e8f\u8fd0\u884c\u4e2d \u9700\u8981\u5206\u914d\u8f83\u5927\u5bf9\u8c61\u65f6\uff0c\u65e0\u6cd5\u627e\u5230\u8db3\u591f\u8fde\u7eed\u5185\u5b58\u800c\u4e0d\u5f97\u4e0d\u89e6\u53d1\u4e00\u6b21\u5783\u573e\u56de\u6536\uff0c\u89e6\u53d1\u4e00\u6b21\u4e4b\u540e\u8981\u662f\u5185\u5b58\u8fd8\u4e0d\u591f\uff0c\u5c31\u4f1a\u8fde\u7eed\u89e6\u53d1\uff0c\u5bfc\u81f4OOM\n<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u8001\u5e74\u4ee3\u7684\u5783\u573e\u6536\u96c6\u53eb\u505a Major GC\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Minor GC \u548c Major GC \u5176\u5b9e\u5c31\u662f\u5e74\u8f7b\u4ee3 GC \u548c\u5e74\u8001\u5e74 GC \u7684\u4fd7\u79f0\u3002\u800c\u5728 Hotspot VM \u5177\u4f53\u5b9e\u73b0\u7684\u6536\u96c6\u5668\uff1aSerial GC, Parallel GC, CMS, G1 GC\u4e2d\uff0c\u5927\u81f4\u53ef\u4ee5\u5bf9\u5e94\u5230\u67d0\u4e2a Young GC \u548c Old GC \u7b97\u6cd5\u7ec4\u5408\u3002 <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u66f4\u591a\u9762\u8bd5\u9898\uff0c\u8bf7\u5173\u6ce8\u6211\u7684\u4e2a\u4eba\u5c0f\u7a0b\u5e8f\u3002<\/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\" src=\"https:\/\/raw.githubusercontent.com\/xmt1139057136\/xttblog\/master\/8fa5dcfcgy1g4em3rzar5j20ib089ae0.jpg\" alt=\"\u4e1a\u4f59\u8349\u516c\u4f17\u53f7\"\/>--><img decoding=\"async\" src=\"https:\/\/saas.51autoparts.cn\/api\/admin\/sys-file\/oss\/file?fileName=84db51f8561e448f9a4fda2eff0811f9.jpg\" 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href=\"https:\/\/www.xttblog.com\/?p=4191\">\u9762\u8bd5\u5fc5\u95ee\u7684 Major Gc \u4f60\u4e86\u89e3\u4e00\u4e0b<\/a><\/p><!-- <div class=\"bd-reward-stl\"><button id=\"bdRewardBtn\"><span><\/span><\/button><\/div> -->","protected":false},"excerpt":{"rendered":"<p>\u524d\u9762\u6211\u5199\u4e86\u4e00\u7bc7\u5173\u4e8e Minor Gc \u7684\u6587\u7ae0\uff0c\u770b\u5f97\u4eba\u867d\u7136\u4e0d\u591a\uff0c\u4f46\u662f\u5f88\u591a\u4eba\u7684\u8bc4\u8bba\u7ed9\u6211\u7559\u4e0b\u4e86\u6df1\u523b\u7684\u5370\u8c61\u3002\u4eca\u5929\u6211\u4eec\u7ee7 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[1174,1964,1963,1744,62],"class_list":["post-4191","post","type-post","status-publish","format-standard","hentry","category-java","tag-gc","tag-majorgc","tag-minorgc","tag-useparallelgc","tag-62"],"_links":{"self":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4191"}],"version-history":[{"count":1,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4191\/revisions"}],"predecessor-version":[{"id":4192,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=\/wp\/v2\/posts\/4191\/revisions\/4192"}],"wp:attachment":[{"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.xttblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}