{"id":11258,"date":"2023-11-28T21:57:19","date_gmt":"2023-11-28T13:57:19","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=11258"},"modified":"2023-12-08T11:24:31","modified_gmt":"2023-12-08T03:24:31","slug":"you-shen-me-dui-wai-nei-cun-de-pai-cha-si-lu","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/11\/28\/you-shen-me-dui-wai-nei-cun-de-pai-cha-si-lu\/","title":{"rendered":"\u6709\u4ec0\u4e48\u5806\u5916\u5185\u5b58\u7684\u6392\u67e5\u601d\u8def\uff1f"},"content":{"rendered":"<p>\u6392\u67e5\u5806\u5916\u5185\u5b58\uff08Off-Heap Memory\uff09\u95ee\u9898\u901a\u5e38\u9700\u8981\u8003\u8651\u4e00\u4e9b\u7279\u5b9a\u7684\u573a\u666f\u548c\u5de5\u5177\uff0c\u56e0\u4e3a\u5806\u5916\u5185\u5b58\u4e0d\u53d7Java\u865a\u62df\u673a\u7684\u5783\u573e\u56de\u6536\u673a\u5236\u7ba1\u7406\uff0c\u65e0\u6cd5\u901a\u8fc7\u5e38\u89c4\u7684JVM\u5de5\u5177\u6765\u68c0\u67e5\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u53ef\u80fd\u7684\u6392\u67e5\u601d\u8def\u548c\u5de5\u5177\uff1a<\/p>\n<ol>\n<li>\n<strong>\u5ba1\u67e5\u4ee3\u7801\uff1a<\/strong><\/p>\n<ul>\n<li>\u9996\u5148\uff0c\u5ba1\u67e5\u5e94\u7528\u7a0b\u5e8f\u7684\u4ee3\u7801\uff0c\u7279\u522b\u662f\u6d89\u53ca\u5230\u4f7f\u7528\u5806\u5916\u5185\u5b58\u7684\u90e8\u5206\u3002\u67e5\u627e\u4f7f\u7528<code>ByteBuffer<\/code>\u3001<code>Unsafe<\/code>\u7c7b\u7b49\u76f4\u63a5\u5206\u914d\u5806\u5916\u5185\u5b58\u7684\u4ee3\u7801\u6bb5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5185\u5b58\u6620\u5c04\u5de5\u5177\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f7f\u7528\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u5185\u5b58\u6620\u5c04\u5de5\u5177\uff0c\u4f8b\u5982Linux\u4e0b\u7684<code>pmap<\/code>\u547d\u4ee4\u6216Windows\u4e0b\u7684<code>VMMap<\/code>\u5de5\u5177\uff0c\u6765\u67e5\u770b\u8fdb\u7a0b\u7684\u5185\u5b58\u6620\u5c04\u60c5\u51b5\uff0c\u5305\u62ec\u5806\u5916\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5806\u5916\u5185\u5b58\u5206\u914d\u60c5\u51b5\uff1a<\/strong><\/p>\n<ul>\n<li>\n\u68c0\u67e5\u5e94\u7528\u7a0b\u5e8f\u7684\u5806\u5916\u5185\u5b58\u5206\u914d\u60c5\u51b5\u3002\u8fd9\u53ef\u80fd\u9700\u8981\u4f7f\u7528\u7279\u5b9a\u7684\u5806\u5916\u5185\u5b58\u5206\u6790\u5de5\u5177\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528Java\u865a\u62df\u673a\u5de5\u5177<code>jcmd<\/code>\u6216<code>jmap<\/code>\u7ed3\u5408<code>NativeMemoryTracking<\/code>\u6765\u76d1\u63a7Native\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<pre><code class=\"language-bash\">jcmd &lt;pid&gt; VM.native_memory summary\n<\/code><\/pre>\n<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>JVM\u53c2\u6570\u914d\u7f6e\uff1a<\/strong><\/p>\n<ul>\n<li>\u68c0\u67e5JVM\u7684\u542f\u52a8\u53c2\u6570\uff0c\u7279\u522b\u662f\u4e0e\u5806\u5916\u5185\u5b58\u76f8\u5173\u7684\u53c2\u6570\u3002\u4f8b\u5982\uff0c\u68c0\u67e5\u662f\u5426\u4f7f\u7528\u4e86<code>-XX:MaxDirectMemorySize<\/code>\u53c2\u6570\u9650\u5236\u5806\u5916\u5185\u5b58\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>GC\u65e5\u5fd7\u5206\u6790\uff1a<\/strong><\/p>\n<ul>\n<li>\u867d\u7136\u5806\u5916\u5185\u5b58\u4e0d\u53d7\u5783\u573e\u56de\u6536\u7ba1\u7406\uff0c\u4f46GC\u65e5\u5fd7\u4e2d\u7684\u4e00\u4e9b\u4fe1\u606f\u4ecd\u7136\u53ef\u80fd\u63d0\u4f9b\u4e00\u4e9b\u7ebf\u7d22\u3002\u901a\u8fc7\u68c0\u67e5GC\u65e5\u5fd7\uff0c\u53ef\u4ee5\u4e86\u89e3\u5230Java\u5806\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u4ece\u800c\u95f4\u63a5\u63a8\u65ad\u51fa\u5806\u5916\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>Heap Dump\u5206\u6790\uff1a<\/strong><\/p>\n<ul>\n<li>\u8003\u8651\u83b7\u53d6Java\u5806\u5185\u5b58\u7684Heap Dump\uff0c\u5e76\u4f7f\u7528\u76f8\u5e94\u7684\u5206\u6790\u5de5\u5177\u6765\u68c0\u67e5\u5806\u5916\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\u3002\u4f8b\u5982\uff0c\u4f7f\u7528Eclipse Memory Analyzer\uff08MAT\uff09\u6216VisualVM\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5229\u7528\u5806\u5916\u5185\u5b58\u5206\u6790\u5de5\u5177\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u4e9b\u7b2c\u4e09\u65b9\u7684\u5806\u5916\u5185\u5b58\u5206\u6790\u5de5\u5177\uff08\u5982<code>jemalloc<\/code>\u3001<code>NativeMemory<\/code>\u3001<code>JOL (Java Object Layout)<\/code>\u7b49\uff09\u53ef\u80fd\u63d0\u4f9b\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\uff0c\u5e2e\u52a9\u8bc6\u522b\u5806\u5916\u5185\u5b58\u7684\u5206\u914d\u548c\u4f7f\u7528\u60c5\u51b5\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u5b9a\u4f4d\u6cc4\u6f0f\u6216\u4e0d\u91ca\u653e\u7684\u5806\u5916\u5185\u5b58\uff1a<\/strong><\/p>\n<ul>\n<li>\u5982\u679c\u5b58\u5728\u5806\u5916\u5185\u5b58\u6cc4\u6f0f\u6216\u8005\u672a\u91ca\u653e\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528\u5185\u5b58\u5206\u6790\u5de5\u5177\uff0c\u5982<code>jemalloc<\/code>\u3001<code>jemalloc<\/code>\uff0c\u6765\u8fdb\u884c\u5b9a\u4f4d\u3002\u67e5\u770b\u54ea\u4e9b\u90e8\u5206\u7684\u5185\u5b58\u6ca1\u6709\u88ab\u91ca\u653e\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<strong>\u68c0\u67e5\u7b2c\u4e09\u65b9\u5e93\u7684\u4f7f\u7528\uff1a<\/strong><\/p>\n<ul>\n<li>\u4e00\u4e9b\u7b2c\u4e09\u65b9\u5e93\uff08\u5982Netty\u3001HikariCP\u7b49\uff09\u53ef\u80fd\u4f7f\u7528\u5806\u5916\u5185\u5b58\u8fdb\u884c\u4f18\u5316\uff0c\u68c0\u67e5\u8fd9\u4e9b\u5e93\u7684\u6587\u6863\u548c\u914d\u7f6e\uff0c\u786e\u4fdd\u5b83\u4eec\u7684\u4f7f\u7528\u65b9\u5f0f\u7b26\u5408\u9884\u671f\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>\u6839\u636e\u5177\u4f53\u60c5\u51b5\uff0c\u53ef\u80fd\u9700\u8981\u7ed3\u5408\u591a\u4e2a\u5de5\u5177\u548c\u624b\u6bb5\u8fdb\u884c\u7efc\u5408\u5206\u6790\uff0c\u4ee5\u786e\u5b9a\u548c\u89e3\u51b3\u5806\u5916\u5185\u5b58\u7684\u95ee\u9898\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6392\u67e5\u5806\u5916\u5185\u5b58\uff08Off-Heap Memory\uff09\u95ee\u9898\u901a\u5e38\u9700\u8981\u8003\u8651\u4e00\u4e9b\u7279\u5b9a\u7684\u573a\u666f\u548c\u5de5\u5177\uff0c\u56e0\u4e3a\u5806\u5916\u5185\u5b58\u4e0d\u53d7Java\u865a [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119],"tags":[],"class_list":["post-11258","post","type-post","status-publish","format-standard","hentry","category-jvm"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/11258","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\/9"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=11258"}],"version-history":[{"count":2,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/11258\/revisions"}],"predecessor-version":[{"id":16975,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/11258\/revisions\/16975"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=11258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=11258"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=11258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}