{"id":37311,"date":"2023-12-11T14:40:57","date_gmt":"2023-12-11T06:40:57","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=37311"},"modified":"2023-12-11T14:40:57","modified_gmt":"2023-12-11T06:40:57","slug":"minor-gc%e5%92%8cfull-gc-%e6%9c%89%e4%bb%80%e4%b9%88%e4%b8%8d%e5%90%8c%e5%91%a2%ef%bc%9f","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/11\/minor-gc%e5%92%8cfull-gc-%e6%9c%89%e4%bb%80%e4%b9%88%e4%b8%8d%e5%90%8c%e5%91%a2%ef%bc%9f\/","title":{"rendered":"Minor Gc\u548cFull GC \u6709\u4ec0\u4e48\u4e0d\u540c\u5462\uff1f"},"content":{"rendered":"<p>&#8220;`&#8221;<\/p>\n<ul>\n<li><strong>\u65b0\u751f\u4ee3 GC\uff08Minor GC\uff09<\/strong>:\u6307\u53d1\u751f\u65b0\u751f\u4ee3\u7684\u7684\u5783\u573e\u6536\u96c6\u52a8\u4f5c\uff0cMinor GC \u975e\u5e38\u9891\u7e41\uff0c\u56de\u6536\u901f\u5ea6\u4e00\u822c\u4e5f\u6bd4\u8f83\u5feb\u3002<\/li>\n<li><strong>\u8001\u5e74\u4ee3 GC\uff08Major GC\/Full GC\uff09<\/strong>:\u6307\u53d1\u751f\u5728\u8001\u5e74\u4ee3\u7684 GC\uff0c\u51fa\u73b0\u4e86 Major GC \u7ecf\u5e38\u4f1a\u4f34\u968f\u81f3\u5c11\u4e00\u6b21\u7684 Minor GC\uff08\u5e76\u975e\u7edd\u5bf9\uff09\uff0cMajor GC \u7684\u901f\u5ea6\u4e00\u822c\u4f1a\u6bd4 Minor GC \u7684\u6162 10 \u500d\u4ee5\u4e0a\u3002<\/li>\n<\/ul>\n<p><strong>\u6d4b\u8bd5\uff1a<\/strong><\/p>\n<p><code><\/code><code>javapublic class GCTest {&lt;\/p&gt;&lt;pre&gt;&lt;code&gt;public static void main(String[] args) {\tbyte[] allocation1, allocation2;\tallocation1 = new byte[30900*1024];\t\/\/allocation2 = new byte[900*1024];}&lt;\/code&gt;&lt;\/pre&gt;&lt;p&gt;}&lt;code&gt;&lt;\/code&gt;<\/code>\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u8fd0\u884c\uff1a<img decoding=\"async\" alt=\"\"\"\" src=\"\"http:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/18-8-26\/25178350.jpg\"\" style=\"\"width: 100%;\"\"><\/p>\n<p>\u6dfb\u52a0\u7684\u53c2\u6570\uff1a<code>-XX:+PrintGCDetails<\/code><img decoding=\"async\" alt=\"\"\"\" src=\"\"http:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/18-8-26\/10317146.jpg\"\" style=\"\"width: 100%;\"\"><\/p>\n<p>\u8fd0\u884c\u7ed3\u679c (\u7ea2\u8272\u5b57\u4f53\u63cf\u8ff0\u6709\u8bef\uff0c\u5e94\u8be5\u662f\u5bf9\u5e94\u4e8e JDK1.7 \u7684\u6c38\u4e45\u4ee3)\uff1a<\/p>\n<p><img decoding=\"async\" alt=\"\"\"\" src=\"\"http:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/18-8-26\/28954286.jpg\"\"><\/p>\n<p>\u4ece\u4e0a\u56fe\u6211\u4eec\u53ef\u4ee5\u770b\u51fa eden \u533a\u5185\u5b58\u51e0\u4e4e\u5df2\u7ecf\u88ab\u5206\u914d\u5b8c\u5168\uff08\u5373\u4f7f\u7a0b\u5e8f\u4ec0\u4e48\u4e5f\u4e0d\u505a\uff0c\u65b0\u751f\u4ee3\u4e5f\u4f1a\u4f7f\u7528 2000 \u591a k \u5185\u5b58\uff09\u3002\u5047\u5982\u6211\u4eec\u518d\u4e3a allocation2 \u5206\u914d\u5185\u5b58\u4f1a\u51fa\u73b0\u4ec0\u4e48\u60c5\u51b5\u5462\uff1f<\/p>\n<p><code>javaallocation2 = new byte[900*1024];<\/code><img decoding=\"async\" alt=\"\"\"\" src=\"\"http:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/18-8-26\/28128785.jpg\"\"><\/p>\n<p><strong>\u7b80\u5355\u89e3\u91ca\u4e00\u4e0b\u4e3a\u4ec0\u4e48\u4f1a\u51fa\u73b0\u8fd9\u79cd\u60c5\u51b5\uff1a<\/strong> \u56e0\u4e3a\u7ed9 allocation2 \u5206\u914d\u5185\u5b58\u7684\u65f6\u5019 eden \u533a\u5185\u5b58\u51e0\u4e4e\u5df2\u7ecf\u88ab\u5206\u914d\u5b8c\u4e86\uff0c\u6211\u4eec\u521a\u521a\u8bb2\u4e86\u5f53 Eden \u533a\u6ca1\u6709\u8db3\u591f\u7a7a\u95f4\u8fdb\u884c\u5206\u914d\u65f6\uff0c\u865a\u62df\u673a\u5c06\u53d1\u8d77\u4e00\u6b21 Minor GC.GC \u671f\u95f4\u865a\u62df\u673a\u53c8\u53d1\u73b0 allocation1 \u65e0\u6cd5\u5b58\u5165 Survivor \u7a7a\u95f4\uff0c\u6240\u4ee5\u53ea\u597d\u901a\u8fc7 <strong>\u5206\u914d\u62c5\u4fdd\u673a\u5236<\/strong> \u628a\u65b0\u751f\u4ee3\u7684\u5bf9\u8c61\u63d0\u524d\u8f6c\u79fb\u5230\u8001\u5e74\u4ee3\u4e2d\u53bb\uff0c\u8001\u5e74\u4ee3\u4e0a\u7684\u7a7a\u95f4\u8db3\u591f\u5b58\u653e allocation1\uff0c\u6240\u4ee5\u4e0d\u4f1a\u51fa\u73b0 Full GC\u3002\u6267\u884c Minor GC \u540e\uff0c\u540e\u9762\u5206\u914d\u7684\u5bf9\u8c61\u5982\u679c\u80fd\u591f\u5b58\u5728 eden \u533a\u7684\u8bdd\uff0c\u8fd8\u662f\u4f1a\u5728 eden \u533a\u5206\u914d\u5185\u5b58\u3002\u53ef\u4ee5\u6267\u884c\u5982\u4e0b\u4ee3\u7801\u9a8c\u8bc1\uff1a<\/p>\n<p><code><\/code>`javapublic class GCTest {<\/p>\n<pre><code>public static void main(String[] args) {\tbyte[] allocation1, allocation2,allocation3,allocation4,allocation5;\tallocation1 = new byte[32000*1024];\tallocation2 = new byte[1000*1024];\tallocation3 = new byte[1000*1024];\tallocation4 = new byte[1000*1024];\tallocation5 = new byte[1000*1024];}<\/code><\/pre>\n<p>}<\/p>\n<p><code><\/code>`<\/p>\n<pre><code>            \"```\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;`&#8221; \u65b0\u751f\u4ee3 GC\uff08Minor GC\uff09:\u6307\u53d1\u751f\u65b0\u751f\u4ee3\u7684\u7684\u5783\u573e\u6536\u96c6\u52a8\u4f5c\uff0cMinor G [&hellip;]<\/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-37311","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37311","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=37311"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37311\/revisions"}],"predecessor-version":[{"id":37312,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37311\/revisions\/37312"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37311"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37311"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37311"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}