{"id":2906,"date":"2023-07-14T13:52:14","date_gmt":"2023-07-14T05:52:14","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=2906"},"modified":"2023-07-14T13:52:15","modified_gmt":"2023-07-14T05:52:15","slug":"%e5%88%9b%e9%80%a0%e4%b8%8e%e5%b8%83%e5%b1%80%ef%bc%9a%e5%89%96%e6%9e%90-java-%e5%af%b9%e8%b1%a1%e5%88%9b%e5%bb%ba%e8%bf%87%e7%a8%8b%e4%bb%a5%e5%8f%8a%e5%86%85%e5%ad%98%e5%b8%83%e5%b1%80","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/java\/%e5%88%9b%e9%80%a0%e4%b8%8e%e5%b8%83%e5%b1%80%ef%bc%9a%e5%89%96%e6%9e%90-java-%e5%af%b9%e8%b1%a1%e5%88%9b%e5%bb%ba%e8%bf%87%e7%a8%8b%e4%bb%a5%e5%8f%8a%e5%86%85%e5%ad%98%e5%b8%83%e5%b1%80\/","title":{"rendered":"\u521b\u9020\u4e0e\u5e03\u5c40\uff1a\u5256\u6790 Java \u5bf9\u8c61\u521b\u5efa\u8fc7\u7a0b\u4ee5\u53ca\u5185\u5b58\u5e03\u5c40"},"content":{"rendered":"<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/kdoc_html_views-1a98987dfd.css\">\n \t<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/ck_htmledit_views-25cebea3f9.css\">\n<div id=\"content_views\" class=\"markdown_views prism-github-gist\">\n <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"display: none;\"> <path stroke-linecap=\"round\" d=\"M5,0 0,2.5 5,5z\" id=\"raphael-marker-block\" style=\"-webkit-tap-highlight-color: rgba(0, 0, 0, 0);\"><\/path>\n <\/svg><\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><br \/>\n<strong>\u76ee\u5f55<\/strong><\/p>\n<div class=\"toc\">\n<h3><\/h3>\n<ul>\n<li><a href=\"#_4\" target=\"_blank\"  rel=\"nofollow\" >\u524d\u8a00<\/a><\/li>\n<li><a href=\"#_12\" target=\"_blank\"  rel=\"nofollow\" >\u521b\u5efa\u5bf9\u8c61\u8fc7\u7a0b<\/a><\/li>\n<li><a href=\"#_23\" target=\"_blank\"  rel=\"nofollow\" >\u5bf9\u8c61\u5e03\u5c40<\/a><\/li>\n<li>\n<ul>\n<li><a href=\"#_38\" target=\"_blank\"  rel=\"nofollow\" >\u666e\u901a\u5bf9\u8c61<\/a><\/li>\n<li><a href=\"#_47\" target=\"_blank\"  rel=\"nofollow\" >\u6570\u7ec4\u5bf9\u8c61<\/a><\/li>\n<li><a href=\"#_Object__57\" target=\"_blank\"  rel=\"nofollow\" >\u5982\u4f55\u89c2\u5bdf Object \u5927\u5c0f<\/a><\/li>\n<li><a href=\"#_155\" target=\"_blank\"  rel=\"nofollow\" >\u5bf9\u8c61\u5934\u7ec4\u6210\u90e8\u5206<\/a><\/li>\n<\/ul>\n<\/li>\n<li><a href=\"#_184\" target=\"_blank\"  rel=\"nofollow\" >\u5bf9\u8c61\u5982\u4f55\u5b9a\u4f4d<\/a><\/li>\n<li><a href=\"#_204\" target=\"_blank\"  rel=\"nofollow\" >\u5bf9\u8c61\u5982\u4f55\u5206\u914d<\/a><\/li>\n<li><a href=\"#_219\" target=\"_blank\"  rel=\"nofollow\" >\u603b\u7ed3<\/a><\/li>\n<\/ul>\n<\/div>\n<h1><a id=\"_4\"><\/a>\u524d\u8a00<\/h1>\n<p>\u4e0a\u4e0b\u6587\u63d0\u53ca\u5230\u4e86\u7c7b\u7684\u52a0\u8f7d\u8fc7\u7a0b\uff0c\u8be6\u7ec6\u4ecb\u7ecd\u4e86\u52a0\u8f7d\u7c7b\u7684\u6bcf\u4e2a\u9636\u6bb5\uff1aLoading\u3001Linking\u3001Initialize\uff0c\u5728\u5176\u4e2d\u4e5f\u8bf4\u660e\u4e86\u9759\u6001\u53d8\u91cf\u8d4b\u503c\u987a\u5e8f &gt; \u5148\u8d4b\u4e88\u9ed8\u8ba4\u503c\u3001\u5728 Initialize \u521d\u59cb\u5316\u9636\u6bb5\u8d4b\u4e88\u521d\u59cb\u503c<\/p>\n<p><a href=\"https:\/\/blog.csdn.net\/vnjohn\/article\/details\/131361753\" target=\"_blank\"  rel=\"nofollow\" >\u4ece\u7c7b\u52a0\u8f7d\u5230\u53cc\u4eb2\u59d4\u6d3e\uff1a\u6df1\u5165\u89e3\u6790\u7c7b\u52a0\u8f7d\u673a\u5236\u4e0e ClassLoader<\/a><\/p>\n<p>\u8be5\u7bc7\u6587\u7ae0\u4f1a\u8be6\u7ec6\u5b9e\u4f8b\u5bf9\u8c61\u7684\u521b\u5efa\u8fc7\u7a0b\u3001\u5bf9\u8c61\u5982\u4f55\u5e03\u5c40\u3001\u5bf9\u8c61\u5934\u5305\u62ec\u54ea\u4e9b\u5185\u5bb9\u4ee5\u53ca\u5bf9\u8c61\u5982\u4f55\u5b9a\u4f4d\u3001\u5206\u914d\u7b49<\/p>\n<h1><a id=\"_12\"><\/a>\u521b\u5efa\u5bf9\u8c61\u8fc7\u7a0b<\/h1>\n<p>\u521b\u5efa\u5bf9\u8c61\u7684\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u521b\u5efa\u4e00\u4e2a\u5bf9\u8c61\uff1anew Obj()\uff0c\u7b2c\u4e00\u6b65\u628a class \u6587\u4ef6 loading \u8fdb\u5185\u5b58\u4e2d<\/li>\n<li>\u7b2c\u4e8c\u6b65\uff1aLinking \u94fe\u63a5\u9636\u6bb5\uff0c\u5206\u4e3a\u4e09\u90e8\u5206\u8fdb\u884c\uff1aVerification \u6821\u9a8c\u6587\u4ef6\u662f\u5426\u7b26\u5408 class \u683c\u5f0f\uff08CAFE BABY\uff09\u3001Preparation \u5c06\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u8d4b\u9ed8\u8ba4\u503c\u3001Resolution \u5c06\u7b26\u53f7\u5f15\u7528\u89e3\u6790\u4e3a\u76f4\u63a5\u5f15\u7528<\/li>\n<li>\u7b2c\u4e09\u6b65\uff1aInitialize \u521d\u59cb\u5316\u9636\u6bb5\u5c06\u7c7b\u7684\u9759\u6001\u53d8\u91cf\u8bbe\u7f6e\u521d\u59cb\u503c\uff0c\u540c\u65f6\u6267\u884c\u9759\u6001\u4ee3\u7801\u5757\u8bed\u53e5<\/li>\n<li>\u7533\u8bf7\u5bf9\u8c61\u5185\u5b58\uff0c\u6210\u5458\u53d8\u91cf\u8d4b\u9ed8\u8ba4\u503c<\/li>\n<li>\u8c03\u7528\u6784\u9020\u65b9\u6cd5\uff1a\u6210\u5458\u53d8\u91cf\u6309\u987a\u5e8f\u8d4b\u521d\u59cb\u503c\u3001\u6267\u884c\u6784\u9020\u65b9\u6cd5\u7684\u4ee3\u7801\u5757<\/li>\n<\/ol>\n<p>\u521b\u5efa\u5bf9\u8c61\u9700\u8981\u9884\u5148\u7533\u8bf7\u597d\u5185\u5b58\uff0c\u6210\u5458\u53d8\u91cf\u518d\u8d4b\u9ed8\u8ba4\u503c\uff0c\u7136\u540e\u518d\u8c03\u7528\u6784\u9020\u65b9\u6cd5\u65f6\uff0c\u5148\u4f1a\u5c06\u6210\u5458\u53d8\u91cf\u6309\u987a\u5e8f\u8fdb\u884c\u8d4b\u4e88\u521d\u59cb\u503c\uff0c\u518d\u540e\u6765\u624d\u8c03\u7528\u6784\u9020\u65b9\u6cd5 &gt; \u7b2c\u4e00\u53e5\u5148\u901a\u8fc7 <code>super()<\/code> \u65b9\u6cd5\u8c03\u7528\u7236\u7c7b<\/p>\n<h1><a id=\"_23\"><\/a>\u5bf9\u8c61\u5e03\u5c40<\/h1>\n<p>\u89c2\u5bdf\u865a\u62df\u673a\u9ed8\u8ba4\u914d\u7f6e\uff1ajava -XX:+PrintCommandLineFlags -version<\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/2023071413513964644654d.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/2023071413513964644654d.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<pre><code class=\"prism language-shell\">-XX:InitialHeapSize<span class=\"token operator\">=<\/span><span class=\"token number\">23891840<\/span> -XX:MaxHeapSize<span class=\"token operator\">=<\/span><span class=\"token number\">382269440<\/span> -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops\n<\/code><\/pre>\n<p>\u4f5c\u4e3a\u5185\u5b58\u5e03\u5c40\u7684\u5bf9\u8c61\u5206\u4e3a\u4e24\u79cd\uff1a<br \/>\n1\u3001\u666e\u901a\u5bf9\u8c61<br \/>\n2\u3001\u6570\u7ec4\u5bf9\u8c61<\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/20230714135139cdcd168a0.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/20230714135139cdcd168a0.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<h2><a id=\"_38\"><\/a>\u666e\u901a\u5bf9\u8c61<\/h2>\n<p>\u666e\u901a\u5bf9\u8c61\u5185\u90e8\u6709\u51e0\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\u7ec4\u6210\u90e8\u5206\uff0c\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5bf9\u8c61\u5934\uff1a\u5305\u542b\u4e86 Mark Word \u6807\u8bb0\u5b57\u53ca Klass Pointer \u7c7b\u578b\u6307\u9488\uff0c\u957f\u5ea6\u4e3a 8 \u5b57\u8282<\/li>\n<\/ol>\n<blockquote><p>Mark Word \u6807\u8bb0\u5b57\uff0c\u957f\u5ea6\u4e3a 8 \u5b57\u8282<br \/>\nClassPointer \u6307\u9488\uff0c\u5f00\u542f\uff1a-XX:+UseCompressedClassPointers \u53c2\u6570\u540e\u4f1a\u538b\u7f29\u4e3a 4 \u5b57\u8282\uff0c\u4e0d\u5f00\u542f\u4e3a 8 \u5b57\u8282<\/p><\/blockquote>\n<ol start=\"2\">\n<li>\u5b9e\u4f8b\u6570\u636e\uff0c\u5f00\u542f\uff1a-XX:+UseCompressedOops \u53c2\u6570\u540e\uff0c\u5f00\u542f\u65f6\u5f15\u7528\u7c7b\u578b\u4e3a 4 \u5b57\u8282\uff0c\u4e0d\u5f00\u542f\u65f6\u4e3a 8 \u5b57\u8282<\/li>\n<li>\u586b\u5145\u5bf9\u9f50\uff0cPadding \u586b\u5145\u5fc5\u987b\u662f 8 \u7684\u6574\u6570\u500d<\/li>\n<\/ol>\n<h2><a id=\"_47\"><\/a>\u6570\u7ec4\u5bf9\u8c61<\/h2>\n<p>\u6570\u7ec4\u5bf9\u8c61\u5185\u90e8\u6709\u51e0\u4e2a\u91cd\u8981\u7684\u6982\u5ff5\u7ec4\u6210\u90e8\u5206\uff0c\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5bf9\u8c61\u5934\uff1a\u5305\u542b\u4e86 Mark Word \u6807\u8bb0\u5b57\u53ca Klass Pointer \u7c7b\u578b\u6307\u9488\uff0c\u540c\u666e\u901a\u5bf9\u8c61\u4e00\u6837<\/li>\n<li>\u6570\u7ec4\u957f\u5ea6\u5360\u7528\u4e3a 4 \u5b57\u8282<\/li>\n<li>\u6570\u7ec4\u6570\u636e<\/li>\n<li>\u586b\u5145\u5bf9\u9f50\uff0cPadding \u586b\u5145\u5fc5\u987b\u662f 8 \u7684\u6574\u6570\u500d<\/li>\n<\/ol>\n<p>\u6570\u7ec4\u5bf9\u8c61\u5bf9\u6bd4\u666e\u901a\u5bf9\u8c61\u591a\u4e86<mark>\u6570\u7ec4\u957f\u5ea6<\/mark><\/p>\n<h2><a id=\"_Object__57\"><\/a>\u5982\u4f55\u89c2\u5bdf Object \u5927\u5c0f<\/h2>\n<p>1\u3001\u521b\u5efa\u4e00\u4e2a Agent \u4ee3\u7406\u7c7b\uff0c\u83b7\u53d6\u5bf9\u8c61\u5927\u5c0f<\/p>\n<pre><code class=\"prism language-java\"><span class=\"token keyword\">import<\/span> <span class=\"token namespace\">java<span class=\"token punctuation\">.<\/span>lang<span class=\"token punctuation\">.<\/span>instrument<span class=\"token punctuation\">.<\/span><\/span><span class=\"token class-name\">Instrumentation<\/span><span class=\"token punctuation\">;<\/span>\n\n<span class=\"token comment\">\/**\n * @author vnjohn\n * @since 2023\/06\/26\n *\/<\/span>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">ObjectSizeAgent<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token comment\">\/**\n     * Java \u5185\u90e8\u5b57\u8282\u7801\u5904\u7406\u8c03\u8bd5\u53eb\u4e3a Instrumentation\uff08\u8c03\u5f26\uff09\uff0c\u6240\u4ee5\u6211\u4eec\u5728\u4ee3\u7406\u88c5\u5230\u6211\u4eec JVM \u65f6\u5019\u53ef\u4ee5\u622a\u83b7\u8fd9\u4e2a Instrumentation\n     *\/<\/span>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token class-name\">Instrumentation<\/span> inst<span class=\"token punctuation\">;<\/span>\n\n    <span class=\"token comment\">\/**\n     * \u5fc5\u987b\u8981\u6709 premain \u51fd\u6570\u53c2\u6570\u4e5f\u662f\u56fa\u5b9a\u7684,\u7b2c\u4e8c\u4e2a\u5c31\u662f Instrumentation\n     * \u8fd9\u4e2a\u662f\u865a\u62df\u673a\u8c03\u7528\u7684\u5b83\u4f1a\u5e2e\u6211\u4eec\u521d\u59cb\u5316 instrumentation\uff0c\u6240\u4ee5\u8c03\u7528 getObjectSize \u65b9\u6cd5\u624d\u4e0d\u4f1a\u7a7a\u6307\u9488\n     *\/<\/span>\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">premain<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span> agentArgs<span class=\"token punctuation\">,<\/span><span class=\"token class-name\">Instrumentation<\/span> _inst<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<!-- --><\/span>\n        inst <span class=\"token operator\">=<\/span> _inst<span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span>\n\n    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">long<\/span> <span class=\"token function\">sizeOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Object<\/span> o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">{<!-- --><\/span>\n        <span class=\"token keyword\">return<\/span> inst<span class=\"token punctuation\">.<\/span><span class=\"token function\">getObjectSize<\/span><span class=\"token punctuation\">(<\/span>o<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<p>2\u3001\u5728 META-INF \u76ee\u5f55\u4e0b\uff0c\u521b\u5efa MANIFEST.MF \u6587\u4ef6\uff0c\u8bbe\u7f6e\u7248\u672c\u3001\u4e3b\u51fd\u6570\u8c03\u7528\u524d\u8981\u6267\u884c\u7684\u65b9\u6cd5\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"prism language-markup\">Manifest-Version: 1.0\nCreated-By: vnjohn\nPremain-Class: com.vnjohn.jvm.agent.ObjectSizeAgent\n<\/code><\/pre>\n<p>3\u3001\u5728 maven build \u8282\u70b9\u4e0b\u5f15\u5165\u81ea\u5b9a\u4e49\u7684 MANIFEST \u914d\u7f6e\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"prism language-xml\"><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>build<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>plugins<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>plugin<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.apache.maven.plugins<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>maven-jar-plugin<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>configuration<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>archive<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n                    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>manifestFile<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>src\/META-INF\/MANIFEST.MF<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>manifestFile<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n                <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>archive<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n            <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>configuration<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n        <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>plugin<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>plugins<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>build<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n<\/code><\/pre>\n<p>4\u3001\u5c06\u5176\u6253\u5305\u6210 jar \u5305\uff0c\u518d\u5176\u4ed6\u5b58\u5728\u4e3b\u51fd\u6570\u7684\u9879\u76ee\u4e2d\u5f15\u5165\u8be5\u4f9d\u8d56\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"prism language-xml\"><span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>org.vnjohn<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>groupId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>object-size-agent<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>artifactId<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n    <span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>1.0.0-SNAPSHOT<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>version<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n<span class=\"token tag\"><span class=\"token tag\"><span class=\"token punctuation\">&lt;\/<\/span>dependency<\/span><span class=\"token punctuation\">&gt;<\/span><\/span>\n<\/code><\/pre>\n<p>5\u3001\u7f16\u5199\u6d4b\u8bd5\u7c7b\u4ee3\u7801\uff08\u53ef\u81ea\u884c\u8c03\u6574\u4f60\u60f3\u77e5\u9053\u67d0\u4e2a\u7c7b\u7684\u5927\u5c0f\uff09\u5148\u8c03\u6574\u542f\u52a8\u53c2\u6570\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"prism language-java\"><span class=\"token operator\">-<\/span>javaagent<span class=\"token operator\">:<\/span><span class=\"token operator\">\/<\/span><span class=\"token class-name\">Users<\/span><span class=\"token operator\">\/<\/span>vnjohn<span class=\"token operator\">\/<\/span>repository<span class=\"token operator\">\/<\/span>org<span class=\"token operator\">\/<\/span>vnjohn<span class=\"token operator\">\/<\/span>object<span class=\"token operator\">-<\/span>size<span class=\"token operator\">-<\/span>agent<span class=\"token operator\">\/<\/span><span class=\"token number\">1.0<\/span><span class=\"token number\">.0<\/span><span class=\"token operator\">-<\/span>SNAPSHOT<span class=\"token operator\">\/<\/span>object<span class=\"token operator\">-<\/span>size<span class=\"token operator\">-<\/span>agent<span class=\"token operator\">-<\/span><span class=\"token number\">1.0<\/span><span class=\"token number\">.0<\/span><span class=\"token operator\">-<\/span>SNAPSHOT<span class=\"token punctuation\">.<\/span>jar\n<\/code><\/pre>\n<pre><code class=\"prism language-java\"><span class=\"token comment\">\/**\n * @author vnjohn\n * @since 2023\/6\/26\n *\/<\/span>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">SizeOfAnObject<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n  <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">String<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> args<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ObjectSizeAgent<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sizeOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">Object<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ObjectSizeAgent<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sizeOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token keyword\">int<\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">{<!-- --><\/span><span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n    <span class=\"token class-name\">System<\/span><span class=\"token punctuation\">.<\/span>out<span class=\"token punctuation\">.<\/span><span class=\"token function\">println<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ObjectSizeAgent<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">sizeOf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">new<\/span> <span class=\"token class-name\">OrdinaryObject<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span>\n  <span class=\"token punctuation\">}<\/span>\n\n  <span class=\"token comment\">\/\/ \u4e00\u4e2a Object \u5360\u591a\u5c11\u4e2a\u5b57\u8282<\/span>\n  <span class=\"token comment\">\/\/ Oops = ordinary object pointers  \u666e\u901a\u5bf9\u8c61\u6307\u9488<\/span>\n  <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">OrdinaryObject<\/span> <span class=\"token punctuation\">{<!-- --><\/span>\n    <span class=\"token comment\">\/\/ 8 _markword<\/span>\n    <span class=\"token comment\">\/\/ 4 _class pointer<\/span>\n    <span class=\"token keyword\">int<\/span> id<span class=\"token punctuation\">;<\/span>         <span class=\"token comment\">\/\/ 4<\/span>\n    <span class=\"token class-name\">String<\/span> name<span class=\"token punctuation\">;<\/span>    <span class=\"token comment\">\/\/ 4<\/span>\n    <span class=\"token keyword\">int<\/span> age<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 4<\/span>\n\n    <span class=\"token keyword\">byte<\/span> b1<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 1<\/span>\n    <span class=\"token keyword\">byte<\/span> b2<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 1<\/span>\n\n    <span class=\"token class-name\">Object<\/span> o<span class=\"token punctuation\">;<\/span>       <span class=\"token comment\">\/\/ 4<\/span>\n    <span class=\"token keyword\">byte<\/span> b3<span class=\"token punctuation\">;<\/span>        <span class=\"token comment\">\/\/ 1<\/span>\n  <span class=\"token punctuation\">}<\/span>\n<span class=\"token punctuation\">}<\/span>\n<\/code><\/pre>\n<p>\u5177\u4f53\u66f4\u591a\u7684\u6e90\u7801\u53ca\u4ecb\u7ecd\uff0c\u53ef\u4ee5\u9605\u89c8 GitHub \u4ed3\u5e93\uff1a<a href=\"https:\/\/github.com\/vnjohn\/object-size-agent\" target=\"_blank\"  rel=\"nofollow\" ><strong>object-size-agent.git<\/strong><\/a><\/p>\n<blockquote><p><strong>\u5f53\u6211\u4eec\u8981\u8bc4\u4f30\u4e34\u65f6\u6269\u5bb9\u65b9\u6848\u65f6\uff0c\u90fd\u9700\u8981\u8ba1\u7b97\u597d\u5bf9\u5e94\u5b9e\u4f53\u6240\u5177\u4f53\u8981\u5360\u7528\u7684\u5927\u5c0f\uff0c\u4ee5\u6b64\u6765\u4f5c\u4e3a\u6d4b\u8bd5\u57fa\u51c6\uff0c\u505a\u89c4\u5212\u6765\u5b9a\u4e0b\u6700\u7ec8\u8981\u6269\u5bb9\u7684\u670d\u52a1\u5668\u5927\u5c0f\u53ca\u6570\u91cf\uff01\uff01\uff01<\/strong><\/p><\/blockquote>\n<h2><a id=\"_155\"><\/a>\u5bf9\u8c61\u5934\u7ec4\u6210\u90e8\u5206<\/h2>\n<p>\u5bf9\u8c61\u5934\u7ec4\u6210\u90e8\u5206\uff0c\u53ef\u4ee5\u770b HotSpot \u5185\u6838\u6e90\u7801\u4e2d Mark Word \u7ed3\u6784\uff0c\u5728 markOop.hpp \u6587\u4ef6\u4e2d\uff0c\u622a\u53d6\u4e00\u90e8\u5206\u6e90\u7801\u7684\u6ce8\u91ca\u90e8\u5206\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"prism language-java\"><span class=\"token comment\">\/\/  32 bits:<\/span>\n<span class=\"token comment\">\/\/  --------<\/span>\n<span class=\"token comment\">\/\/             hash:25 ------------&gt;| age:4    biased_lock:1 lock:2 (normal object)<\/span>\n<span class=\"token comment\">\/\/             JavaThread*:23 epoch:2 age:4    biased_lock:1 lock:2 (biased object)<\/span>\n<span class=\"token comment\">\/\/             size:32 ------------------------------------------&gt;| (CMS free block)<\/span>\n<span class=\"token comment\">\/\/             PromotedObject*:29 ----------&gt;| promo_bits:3 -----&gt;| (CMS promoted object)<\/span>\n<span class=\"token comment\">\/\/<\/span>\n<span class=\"token comment\">\/\/  64 bits:<\/span>\n<span class=\"token comment\">\/\/  --------<\/span>\n<span class=\"token comment\">\/\/  unused:25 hash:31 --&gt;| unused:1   age:4    biased_lock:1 lock:2 (normal object)<\/span>\n<span class=\"token comment\">\/\/  JavaThread*:54 epoch:2 unused:1   age:4    biased_lock:1 lock:2 (biased object)<\/span>\n<span class=\"token comment\">\/\/  PromotedObject*:61 ---------------------&gt;| promo_bits:3 -----&gt;| (CMS promoted object)<\/span>\n<span class=\"token comment\">\/\/  size:64 -----------------------------------------------------&gt;| (CMS free block)<\/span>\n<span class=\"token comment\">\/\/<\/span>\n<span class=\"token comment\">\/\/  unused:25 hash:31 --&gt;| cms_free:1 age:4    biased_lock:1 lock:2 (COOPs &amp;&amp; normal object)<\/span>\n<span class=\"token comment\">\/\/  JavaThread*:54 epoch:2 cms_free:1 age:4    biased_lock:1 lock:2 (COOPs &amp;&amp; biased object)<\/span>\n<span class=\"token comment\">\/\/  narrowOop:32 unused:24 cms_free:1 unused:4 promo_bits:3 -----&gt;| (COOPs &amp;&amp; CMS promoted object)<\/span>\n<span class=\"token comment\">\/\/  unused:21 size:35 --&gt;| cms_free:1 unused:7 ------------------&gt;| (COOPs &amp;&amp; CMS free block)<\/span>\n<\/code><\/pre>\n<p>\u4ee5 64 bits \u4f4d\u4e3a\u4f8b\uff0c\u5982\u4e0b\u8868\uff1a<\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/20230714135140bebea82fa.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/20230714135140bebea82fa.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<p>\u4e3a\u4ec0\u4e48 GC \u5e74\u9f84\u9ed8\u8ba4\u8bbe\u7f6e\u4e3a 15\uff1f<\/p>\n<blockquote><p>\u5f53\u6211\u4eec\u4f7f\u7528 PS \u5783\u573e\u56de\u6536\u5668\u65f6\uff0c\u5b83\u9ed8\u8ba4\u7684\u4ece\u5e74\u8f7b\u4ee3\u5347\u5230\u8001\u5e74\u4ee3\u7684\u5e74\u9f84\u4e3a 15\uff0c\u56e0\u4e3a\u53ea\u6709 4 bit \u6765\u8868\u793a\u5206\u4ee3\u5e74\u9f84\uff0c\u6700\u5927\u4e8c\u8fdb\u5236\u4e3a\uff1a1111=8+4+2+1=15\uff0c\u6240\u4ee5\u8bf4<strong>\u6700\u5927\u5e74\u9f84\u4e5f\u5c31\u53ea\u6709 15<\/strong><\/p><\/blockquote>\n<h1><a id=\"_184\"><\/a>\u5bf9\u8c61\u5982\u4f55\u5b9a\u4f4d<\/h1>\n<p>\u5f53 new \u51fa\u6765\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6bd4\u5982\uff1anew OrdinaryObject()\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5bf9\u8c61\u662f\u5982\u4f55\u88ab\u5b9a\u4f4d\u5230\u7684\u5462\uff1f<\/p>\n<p>\u521b\u5efa\u5bf9\u8c61\u81ea\u7136\u662f\u4e3a\u4e86\u540e\u7eed\u4f7f\u7528\u8be5\u5bf9\u8c61\uff0c\u5728\u6211\u4eec Java \u7a0b\u5e8f\u4f1a\u901a\u8fc7\u6808\u4e0a\u7684 reference \u6570\u636e\u6765\u64cd\u4f5c\u5806\u4e0a\u7684\u5177\u4f53\u5bf9\u8c61\uff1b\u7531\u4e8e reference \u7c7b\u578b\u5728\u300aJava \u865a\u62df\u673a\u89c4\u8303\u300b\u91cc\u9762\u53ea\u662f\u89c4\u5b9a\u4e86\u5b83\u662f\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\uff0c\u5e76\u6ca1\u6709\u5b9a\u4e49\u8fd9\u4e2a\u5f15\u7528\u5e94\u8be5\u901a\u8fc7\u4ec0\u4e48\u65b9\u5f0f\u53bb\u5b9a\u4f4d\uff1b\u5bf9\u8c61\u5177\u4f53\u4f7f\u7528\u4ec0\u4e48\u5b9a\u4f4d\u65b9\u5f0f\u662f\u7531\u865a\u62df\u673a\u5b9e\u73b0\u800c\u51b3\u5b9a\u7684\uff0c\u4e3b\u6d41\u7684\u5bf9\u8c61\u5b9a\u4f4d\u65b9\u5f0f\u4e3b\u8981\u6709\u4e24\u79cd\uff1a\u53e5\u67c4\u3001\u76f4\u63a5\u6307\u9488<\/p>\n<p><strong>\u53e5\u67c4\uff1a\u82e5\u4f7f\u7528\u53e5\u67c4\u8bbf\u95ee\u7684\u8bdd\uff0cJava \u5806\u4e2d\u5c06\u4f1a\u5212\u5206\u4e00\u5757\u5185\u5b58\u6765\u4f5c\u4e3a\u53e5\u67c4\u6c60\uff0creference \u5b58\u50a8\u7684\u5c31\u662f\u5bf9\u8c61\u7684\u53e5\u67c4\u5730\u5740\uff0c\u800c\u53e5\u67c4\u4e2d\u5305\u542b\u4e86\u5bf9\u8c61\u5b9e\u4f8b\u6570\u636e\u3001\u7c7b\u578b\u6570\u636e\u5404\u81ea\u7684\u5730\u5740\u4fe1\u606f<\/strong><\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351409a9ab7ee6.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351409a9ab7ee6.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<p><strong>\u76f4\u63a5\u6307\u9488\uff1a\u82e5\u4f7f\u7528\u76f4\u63a5\u6307\u9488\u8bbf\u95ee\u7684\u8bdd\uff0cJava \u5806\u4e2d\u5bf9\u8c61\u7684\u5185\u5b58\u5e03\u5c40\u5c31\u5fc5\u987b\u8003\u8651\u5982\u4f55\u653e\u7f6e\u7c7b\u578b\u6570\u636e\u7684\u76f8\u5173\u4fe1\u606f\uff0creference \u4e2d\u76f4\u63a5\u5b58\u50a8\u7684\u5c31\u662f\u5bf9\u8c61\u5730\u5740\uff0c\u82e5\u53ea\u662f\u8bbf\u95ee\u5bf9\u8c61\u672c\u8eab\u800c\u4e0d\u662f\u5bf9\u8c61\u7c7b\u578b\u6570\u636e\u7684\u8bdd\uff0c\u90a3\u4e48\u5c31\u4e0d\u9700\u8981\u591a\u4e00\u6b21\u7684\u95f4\u63a5\u8bbf\u95ee\u5f00\u9500<\/strong><\/p>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351405d5d70eee.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351405d5d70eee.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<p>\u8fd9\u4e24\u79cd\u5bf9\u8c61\u5b9a\u4f4d\u65b9\u5f0f\u5404\u6709\u4f18\u52a3\uff0c\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u4f7f\u7528\u53e5\u67c4\u6765\u8bbf\u95ee\u7684\u6700\u5927\u597d\u5904\u5c31\u662f reference \u4e2d\u5b58\u50a8\u7684\u662f\u7a33\u5b9a\u7684\u53e5\u67c4\u5730\u5740\uff0c\u5728\u5bf9\u8c61\u88ab\u79fb\u52a8\uff08\u5783\u573e\u6536\u96c6\u65f6\u79fb\u52a8\u5bf9\u8c61\u662f\u975e\u5e38\u666e\u904d\u7684\u884c\u4e3a\uff09\u65f6\u53ea\u4f1a\u6539\u53d8\u53e5\u67c4\u4e2d\u7684\u5b9e\u4f8b\u6570\u636e\u6307\u9488\uff0c\u800c reference \u672c\u8eab\u4e0d\u9700\u8981\u88ab\u4fee\u6539<\/li>\n<\/ol>\n<blockquote><p>GC \u56de\u6536\u65f6\u6548\u7387\u4f1a\u6bd4\u8f83\u9ad8<\/p><\/blockquote>\n<ol start=\"2\">\n<li>\u4f7f\u7528\u76f4\u63a5\u6307\u9488\u6765\u8bbf\u95ee\u7684\u6700\u5927\u597d\u5904\u5c31\u662f\u901f\u5ea6\u66f4\u5feb\uff0c\u5b83\u8282\u7701\u4e86\u4e00\u6b21\u6307\u9488\u5b9a\u4f4d\u7684\u65f6\u95f4\u5f00\u9500\uff0c\u7531\u4e8e\u5bf9\u8c61\u8bbf\u95ee\u5728 Java \u4e2d\u975e\u5e38\u9891\u7e41\uff0c\u56e0\u6b64\u8fd9\u7c7b\u5f00\u9500\u79ef\u5c11\u6210\u591a\u4e5f\u662f\u4e00\u9879\u6781\u4e3a\u53ef\u89c2\u7684\u6267\u884c\u6210\u672c\uff0c\u4e3b\u8981\u7684\u865a\u62df\u673a HotSpot \u5c31\u91c7\u7528\u4e86\u8fd9\u79cd\u65b9\u5f0f\u8fdb\u884c\u5bf9\u8c61\u8bbf\u95ee<\/li>\n<\/ol>\n<h1><a id=\"_204\"><\/a>\u5bf9\u8c61\u5982\u4f55\u5206\u914d<\/h1>\n<p><img decoding=\"async\" class=\"lazyload\"data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-41\/20230714135141020275b83.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><noscript><img decoding=\"async\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-41\/20230714135141020275b83.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/noscript><\/p>\n<p>\u56fe\u89e3\u8fc7\u7a0b\uff0c\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5f53 new \u4e00\u4e2a\u5bf9\u8c61\u65f6\uff0c\u5148\u5f80\u6808\u4e0a\u5206\u914d\uff0c<strong>\u82e5\u6808\u4e0a\u80fd\u5206\u914d\u5c31\u5206\u914d\u5728\u6808\u4e0a<\/strong>\uff0c\u5f53\u6808\u4e0a\u5f39\u51fa\u540e\u5bf9\u8c61\u5c31\u6ca1\u4e86<\/li>\n<\/ol>\n<blockquote><p>\u4f5c\u7528\u4e8e\u65b9\u6cd5\u4f5c\u7528\u57df\u4e0b\u7684\u5bf9\u8c61\uff0c\u975e\u672c\u5730\u7f13\u5b58<\/p><\/blockquote>\n<ol start=\"2\">\n<li>\u82e5\u6808\u4e0a\u65e0\u6cd5\u5206\u914d\uff0c<strong>\u5224\u65ad\u5bf9\u8c61\u662f\u5426\u8db3\u591f\u5927<\/strong>\uff0c\u5bf9\u8c61\u7279\u522b\u5927\u65f6\u76f4\u63a5\u5206\u914d\u5230\u5806\u4e2d\u7684\u8001\u5e74\u4ee3\u4e2d<\/li>\n<li>\u82e5\u5bf9\u8c61\u4e0d\u8db3\u591f\u5927\uff0c\u4f18\u5148\u8fdb\u884c\u7ebf\u7a0b\u672c\u5730\u5206\u914d\uff08TLAB\uff1aThread Local Allocation Buffer\uff09<strong>\u7ebf\u7a0b\u672c\u5730\u7f13\u51b2\u533a\u80fd\u5206\u914d\u4e0b\u5c31\u8fdb\u884c\u5206\u914d<\/strong><\/li>\n<li>\u7ebf\u7a0b\u672c\u5730\u7f13\u51b2\u533a\u5206\u914d\u4e0d\u4e0b\u5c31\u5206\u914d\u5230\u4f0a\u7538\u533a\uff0c\u7136\u540e\u8fdb\u884c GC \u56de\u6536\u8fc7\u7a0b<\/li>\n<li>GC \u5206\u4ee3\u5e74\u9f84\u5230\u4e86\uff08\u6700\u5927\u4e3a 15\uff09\u76f4\u63a5\u8fdb\u5165\u5230\u8001\u5e74\u4ee3\uff0c\u82e5\u5e74\u9f84\u4e0d\u5230\u5c06\u4e00\u76f4\u5728\u5e74\u8f7b\u4ee3\u4e2d YGC \u6765 YGC \u53bb\uff0c\u76f4\u63a5\u5bf9\u8c61\u88ab\u56de\u6536\u6216\u8005\u5e74\u9f84\u8db3\u591f\u6ee1\u8db3\u5230\u8fbe\u8001\u5e74\u4ee3<\/li>\n<\/ol>\n<p>\u4ee5\u4e0a\u7684\u8fc7\u7a0b\u5c31\u662f\u6240\u8c13\u7684<mark>\u5bf9\u8c61\u5206\u914d<\/mark><\/p>\n<h1><a id=\"_219\"><\/a>\u603b\u7ed3<\/h1>\n<p>\u8be5\u7bc7\u535a\u6587\u8bb2\u89e3\u4e86\u521b\u5efa\u5bf9\u8c61\u8fc7\u7a0b\u7684\u51e0\u4e2a\u6838\u5fc3\u6b65\u9aa4\uff0c\u5256\u6790\u4e86\u5bf9\u8c61\u5185\u90e8\u662f\u5982\u4f55\u5e03\u5c40 &gt; \u666e\u901a\u5bf9\u8c61\u3001\u6570\u7ec4\u5bf9\u8c61\uff0c\u901a\u8fc7\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u6848\u4f8b\u6765\u5982\u4f55\u7edf\u8ba1\u4e00\u4e2a Object \u6240\u5360\u7684\u5b57\u8282\u5927\u5c0f\uff0c\u5bf9\u8c61\u5934\u7ec4\u6210\u90e8\u5206\uff1aMark Word\u3001Class Pointer\uff0c\u4ecb\u7ecd\u4e86\u5bf9\u8c61\u5b9a\u4f4d\u7684\u4e24\u79cd\u65b9\u5f0f\uff1a\u53e5\u67c4\u6c60\u3001\u76f4\u63a5\u6307\u9488\uff0c\u6700\u540e\uff0c\u7b80\u8981\u8bf4\u660e\u4e86\u5bf9\u8c61\u5982\u4f55\u5206\u914d\u7684\u8fc7\u7a0b\uff1b\u5e0c\u671b\u4f60\u80fd\u559c\u6b22\uff0c\u5e2e\u52a9\u5230\u4f60\u662f\u83ab\u8fc7\u4e8e\u6700\u5f00\u5fc3\u7684\u4e8b\u4e86\uff01<\/p>\n<p>\u535a\u6587\u653e\u5728 <strong>Java<\/strong> \u4e13\u680f\u91cc\uff0c\u6b22\u8fce\u8ba2\u9605\uff0c\u4f1a\u6301\u7eed\u66f4\u65b0\uff01<\/p>\n<p>\u5982\u679c\u89c9\u5f97\u535a\u6587\u4e0d\u9519\uff0c\u5173\u6ce8\u6211 <strong>vnjohn<\/strong>\uff0c\u540e\u7eed\u4f1a\u6709\u66f4\u591a\u5b9e\u6218\u3001\u6e90\u7801\u3001\u67b6\u6784\u5e72\u8d27\u5206\u4eab\uff01<\/p>\n<p>\u63a8\u8350\u4e13\u680f\uff1aSpring\u3001MySQL\uff0c\u8ba2\u9605\u4e00\u6ce2\u4e0d\u518d\u8ff7\u8def<\/p>\n<p>\u5927\u5bb6\u7684\u300c\u5173\u6ce8\u2764\ufe0f + \u70b9\u8d5e? + \u6536\u85cf\u2b50\u300d\u5c31\u662f\u6211\u521b\u4f5c\u7684\u6700\u5927\u52a8\u529b\uff01\u8c22\u8c22\u5927\u5bb6\u7684\u652f\u6301\uff0c\u6211\u4eec\u4e0b\u6587\u89c1\uff01<\/p>\n<\/div>\n<link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/markdown_views-98b95bb57c.css\" rel=\"stylesheet\">\n \t<link href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/style-c216769e99.css\" rel=\"stylesheet\">\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8eCSDN\uff1ahttps:\/\/blog.csdn.net\/vnjohn\/article\/details\/131388180<\/p>\n","raw":"","protected":false},"excerpt":{"rendered":"<p>\u76ee\u5f55 \u524d\u8a00 \u521b\u5efa\u5bf9\u8c61\u8fc7\u7a0b \u5bf9\u8c61\u5e03\u5c40 \u666e\u901a\u5bf9\u8c61 \u6570\u7ec4\u5bf9\u8c61 \u5982\u4f55\u89c2\u5bdf Object \u5927\u5c0f \u5bf9\u8c61\u5934\u7ec4\u6210\u90e8\u5206 \u5bf9\u8c61\u5982\u4f55\u5b9a\u4f4d \u5bf9\u8c61\u5982\u4f55\u5206\u914d  &#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[2],"tags":[],"class_list":["post-2906","post","type-post","status-publish","format-standard","hentry","category-java"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","content_first_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_frist_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","post_all_images":[{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","id":"image0"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-38\/202307141351385858f8053.gif","id":"image1"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/2023071413513964644654d.png","id":"image2"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/2023071413513964644654d.png","id":"image3"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/20230714135139cdcd168a0.png","id":"image4"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-39\/20230714135139cdcd168a0.png","id":"image5"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/20230714135140bebea82fa.png","id":"image6"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/20230714135140bebea82fa.png","id":"image7"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351409a9ab7ee6.png","id":"image8"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351409a9ab7ee6.png","id":"image9"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351405d5d70eee.png","id":"image10"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-40\/202307141351405d5d70eee.png","id":"image11"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-41\/20230714135141020275b83.png","id":"image12"},{"imagesurl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-51-41\/20230714135141020275b83.png","id":"image13"}],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"Java","post_date":"2023-07-14","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":325,"next_post_id":2918,"next_post_title":"JAVA\u9879\u76ee\u4e2d\u7684\u5f02\u6b65\u4efb\u52a1","previous_post_id":2904,"previous_post_title":"java 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