{"id":538,"date":"2013-05-07T14:23:29","date_gmt":"2013-05-07T06:23:29","guid":{"rendered":"http:\/\/www.yeetrack.com\/?p=538"},"modified":"2023-11-23T09:58:38","modified_gmt":"2023-11-23T01:58:38","slug":"java%e5%a0%86%e5%86%85%e5%ad%98%e8%a7%a3%e6%9e%90%e5%92%8c%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.yeetrack.com\/?p=538","title":{"rendered":"Java\u5806\u5185\u5b58\u89e3\u6790\u548c\u5783\u573e\u56de\u6536\u673a\u5236"},"content":{"rendered":"

JVM\uff08java\u865a\u62df\u673a\uff09\u7684\u5185\u5b58\u7ed3\u6784\u5206\u4e3a\u5806\u3001\u6808\u3001\u672c\u5730\u65b9\u6cd5\u6808\u3001\u65b9\u6cd5\u533a\u7b49\u3002\u6808\u4e3b\u8981\u4fdd\u5b58\u7ebf\u7a0b\u3001\u8fdb\u7a0b\u7b49\u76f8\u5173\u4fe1\u606f\uff0c\u672c\u5730\u65b9\u6cd5\u6808\u7528\u4e8e\u652f\u6301native\u4eba\u65b9\u6cd5\uff0c\u65b9\u6cd5\u533a\u4e3b\u8981\u5b58\u50a8\u7c7b\u3001\u9759\u6001\u53d8\u91cf\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u7b49\uff0c\u8fd9\u4e9b\u4fe1\u606f\u5b58\u653e\u5728PermanetGeneration\u4e2d\uff0c\u53ef\u4ee5\u901a\u8fc7-XX:PermSize<\/code>\u548c-XX:MaxPermSize<\/code>\u6765\u6307\u5b9a\u6700\u5c0f\u503c\u548c\u6700\u5927\u503c\u3002\u4e0b\u9762\u8be6\u7ec6\u4ecb\u7ecd\u4e00\u4e0b\u5806\u5185\u5b58\uff1a<\/p>\n

java\u4e2d\u6240\u6709new\u51fa\u6765\u7684\u5bf9\u8c61\u90fd\u4fdd\u5b58\u5728\u5806\u4e2d\uff0c\u5806\u7684\u5927\u5c0f\u53ef\u4ee5\u901a\u8fc7-Xms<\/code>\u548c-Xmx<\/code>\u6307\u5b9a\u3002\u5806 \u53c8\u5206\u4e3a\u4e09\u4ee3\uff0cYoung\uff08\u65b0\u751f\u4ee3\uff09\u3001Old\uff08\u5e74\u8001\u4ee3\uff09\u548cPermanent\uff08\u6c38\u4e45\u4ee3\uff09\u3002\u65b0\u751f\u4ee3\u53c8\u5206\u4e3aEden\u548cSurvivor\u533a\uff0c\u65b0\u521b\u5efa\u7684\u5bf9\u8c61\u90fd\u5728 Eden\u533a\u3001\u5982\u679cEden\u533a\u7a7a\u95f4\u4e0d\u8db3\uff0c\u5c31\u4f1a\u8bb2\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230Survivor\u533a\uff0c\u5982\u679cSurvivor\u533a\u7a7a\u95f4\u4e0d\u8db3\uff0c\u5c31\u4f1a\u5c06Survivor\u4e2d\u4e00\u76f4\u5b58\u6d3b\u7684 \u5bf9\u8c61\u590d\u5236\u5230Old\u5e74\u8001\u533a\u3002\u5f53young\u4ee3\u5185\u5b58\u6ee1\uff0c\u5c31\u6267\u884cyoung gc\uff0cyoung gc\u9700\u8981\u9ad8\u901f\u3001\u9891\u7e41\u5730\u6267\u884c\u3002\u5f53old\u6216permanent\u4ee3\u5185\u5b58\u6ee1\uff0c\u5c31\u4f1a\u6267\u884cfull gc\uff08magor gc\uff09\uff0c\u6240\u6709\u4ee3\u5185\u5b58\u90fd\u4f1agc\uff0c\u4e00\u822c\u5148young gc\u540eold gc\u3001permanent gc\uff0cold \u4ee3\u5185\u5b58\u6709\u7a7a\u95f4\u5927\u3001\u56e0\u6b64\u589e\u957f\u7f13\u6162\u3001gc\u4e0d\u9891\u7e41\uff0c\u4e00\u6b21full gc\u82b1\u8d39\u7684\u65f6\u95f4\u4e5f\u8f83\u591a\u3002<\/p>\n

Windows\u4e2d\u7684tomcat\u5f00\u542fgc\u65e5\u5fd7\u7684\u65b9\u6cd5\uff1a\u5728catlinna.bat\u4e2d\u6dfb\u52a0set CATALINA_OPTS=-XX:ParallelGCThreads=4 -XX:+PrintGCDetails -Xloggc:D:\/work\/apache-tomcat-7.0.37-windows-x64\/apache-tomcat-7.0.37\/logs\/tomcat_gc.log<\/code>\uff0cgc\u65e5\u5fd7\u5c31\u4f1a\u6253\u5370\u5230\u6211\u4eec\u6307\u5b9a\u7684\u65e5\u5fd7\u6587\u4ef6\u4e2d\u3002 \u5b83\u7684\u683c\u5f0f\u5e94\u8be5\u662f\u8fd9\u6837\uff1a
\nYoung gc 86.188: [GC [PSYoungGen: 32896K->880K(33024K)] 98532K->66588K(99264K), 0.0041792 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]<\/code>
\n\"young-gc\"<\/a>
\nFull GC
\n86.703: [Full GC [PSYoungGen: 960K->0K(33024K)] [PSOldGen: 66156K->54196K(68288K)] 67116K->54196K(101312K) [PSPermGen: 61325K->60902K(83968K)], 0.2525489 secs] [Times: user=0.23 sys=0.00, real=0.25 secs]<\/code><\/p>\n

\"old-gc\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

JVM\uff08java\u865a\u62df\u673a\uff09\u7684\u5185\u5b58\u7ed3\u6784\u5206\u4e3a\u5806\u3001\u6808\u3001\u672c\u5730\u65b9\u6cd5\u6808\u3001\u65b9\u6cd5\u533a\u7b49\u3002\u6808\u4e3b\u8981\u4fdd\u5b58\u7ebf\u7a0b\u3001\u8fdb\u7a0b\u7b49\u76f8\u5173\u4fe1\u606f\uff0c\u672c\u5730\u65b9\u6cd5\u6808\u7528\u4e8e\u652f\u6301native\u4eba\u65b9\u6cd5\uff0c\u65b9\u6cd5\u533a\u4e3b\u8981\u5b58\u50a8\u7c7b\u3001\u9759\u6001\u53d8\u91cf\u3001\u5c5e\u6027\u3001\u65b9\u6cd5\u7b49\uff0c\u8fd9\u4e9b\u4fe1\u606f\u5b58\u653e\u5728Per...<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[33,34],"tags":[8,5,13],"class_list":["post-538","post","type-post","status-publish","format-standard","hentry","category-coding","category-software","tag-java","tag-5","tag-13"],"views":2873,"_links":{"self":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/538","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=538"}],"version-history":[{"count":5,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/538\/revisions"}],"predecessor-version":[{"id":1523,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=\/wp\/v2\/posts\/538\/revisions\/1523"}],"wp:attachment":[{"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.yeetrack.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}