{"id":480,"date":"2008-02-05T00:00:00","date_gmt":"2008-02-04T16:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=480"},"modified":"2011-07-15T09:42:41","modified_gmt":"2011-07-15T01:42:41","slug":"jvm%e8%af%a6%e8%a7%a3%e4%b9%8bjava%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e6%9c%ba%e5%88%b6%e8%af%a6%e8%a7%a3%e5%92%8c%e8%b0%83%e4%bc%98","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=480","title":{"rendered":"JVM\u8be6\u89e3\u4e4bJava\u5783\u573e\u56de\u6536\u673a\u5236\u8be6\u89e3\u548c\u8c03\u4f18"},"content":{"rendered":"

1.JVM\u7684gc\u6982\u8ff0<\/SPAN><\/B>

\u3000\u3000gc\u5373\u5783\u573e\u6536\u96c6\u673a\u5236\u662f\u6307jvm\u7528\u4e8e\u91ca\u653e\u90a3\u4e9b\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u6240\u5360\u7528\u7684\u5185\u5b58\u3002java\u8bed\u8a00\u5e76\u4e0d\u8981\u6c42jvm\u6709gc\uff0c\u4e5f\u6ca1\u6709\u89c4\u5b9agc\u5982\u4f55\u5de5\u4f5c\u3002\u4e0d\u8fc7\u5e38\u7528\u7684jvm\u90fd\u6709gc\uff0c\u800c\u4e14\u5927\u591a\u6570gc\u90fd\u4f7f\u7528\u7c7b\u4f3c\u7684\u7b97\u6cd5\u7ba1\u7406\u5185\u5b58\u548c\u6267\u884c\u6536\u96c6\u64cd\u4f5c\u3002

\u3000\u3000\u5728\u5145\u5206\u7406\u89e3\u4e86\u5783\u573e\u6536\u96c6\u7b97\u6cd5\u548c\u6267\u884c\u8fc7\u7a0b\u540e\uff0c\u624d\u80fd\u6709\u6548\u7684\u4f18\u5316\u5b83\u7684\u6027\u80fd\u3002\u6709\u4e9b\u5783\u573e\u6536\u96c6\u4e13\u7528\u4e8e\u7279\u6b8a\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u6bd4\u5982\uff0c\u5b9e\u65f6\u5e94\u7528\u7a0b\u5e8f\u4e3b\u8981\u662f\u4e3a\u4e86\u907f\u514d\u5783\u573e\u6536\u96c6\u4e2d\u65ad\uff0c\u800c\u5927\u591a\u6570OLTP\u5e94\u7528\u7a0b\u5e8f\u5219\u6ce8\u91cd\u6574\u4f53\u6548\u7387\u3002\u7406\u89e3\u4e86\u5e94\u7528\u7a0b\u5e8f\u7684\u5de5\u4f5c\u8d1f\u8377\u548cjvm\u652f\u6301\u7684\u5783\u573e\u6536\u96c6\u7b97\u6cd5\uff0c\u4fbf\u53ef\u4ee5\u8fdb\u884c\u4f18\u5316\u914d\u7f6e\u5783\u573e\u6536\u96c6\u5668\u3002

\u3000\u3000\u5783\u573e\u6536\u96c6\u7684\u76ee\u7684\u5728\u4e8e\u6e05\u9664\u4e0d\u518d\u4f7f\u7528\u7684\u5bf9\u8c61\u3002gc\u901a\u8fc7\u786e\u5b9a\u5bf9\u8c61\u662f\u5426\u88ab\u6d3b\u52a8\u5bf9\u8c61\u5f15\u7528\u6765\u786e\u5b9a\u662f\u5426\u6536\u96c6\u8be5\u5bf9\u8c61\u3002gc\u9996\u5148\u8981\u5224\u65ad\u8be5\u5bf9\u8c61\u662f\u5426\u662f\u65f6\u5019\u53ef\u4ee5\u6536\u96c6\u3002\u4e24\u79cd\u5e38\u7528\u7684\u65b9\u6cd5\u662f\u5f15\u7528\u8ba1\u6570\u548c\u5bf9\u8c61\u5f15\u7528\u904d\u5386\u3002

\u3000\u30001.1.\u5f15\u7528\u8ba1\u6570<\/B>

\u3000\u3000\u5f15\u7528\u8ba1\u6570\u5b58\u50a8\u5bf9\u7279\u5b9a\u5bf9\u8c61\u7684\u6240\u6709\u5f15\u7528\u6570\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5f53\u5e94\u7528\u7a0b\u5e8f\u521b\u5efa\u5f15\u7528\u4ee5\u53ca\u5f15\u7528\u8d85\u51fa\u8303\u56f4\u65f6\uff0cjvm\u5fc5\u987b\u9002\u5f53\u589e\u51cf\u5f15\u7528\u6570\u3002\u5f53\u67d0\u5bf9\u8c61\u7684\u5f15\u7528\u6570\u4e3a0\u65f6\uff0c\u4fbf\u53ef\u4ee5\u8fdb\u884c\u5783\u573e\u6536\u96c6\u3002

\u3000\u30001.2.\u5bf9\u8c61\u5f15\u7528\u904d\u5386<\/B>

\u3000\u3000\u65e9\u671f\u7684jvm\u4f7f\u7528\u5f15\u7528\u8ba1\u6570\uff0c\u73b0\u5728\u5927\u591a\u6570jvm\u91c7\u7528\u5bf9\u8c61\u5f15\u7528\u904d\u5386\u3002\u5bf9\u8c61\u5f15\u7528\u904d\u5386\u4ece\u4e00\u7ec4\u5bf9\u8c61\u5f00\u59cb\uff0c\u6cbf\u7740\u6574\u4e2a\u5bf9\u8c61\u56fe\u4e0a\u7684\u6bcf\u6761\u94fe\u63a5\uff0c\u9012\u5f52\u786e\u5b9a\u53ef\u5230\u8fbe\uff08reachable\uff09\u7684\u5bf9\u8c61\u3002\u5982\u679c\u67d0\u5bf9\u8c61\u4e0d\u80fd\u4ece\u8fd9\u4e9b\u6839\u5bf9\u8c61\u7684\u4e00\u4e2a\uff08\u81f3\u5c11\u4e00\u4e2a\uff09\u5230\u8fbe\uff0c\u5219\u5c06\u5b83\u4f5c\u4e3a\u5783\u573e\u6536\u96c6\u3002\u5728\u5bf9\u8c61\u904d\u5386\u9636\u6bb5\uff0cgc\u5fc5\u987b\u8bb0\u4f4f\u54ea\u4e9b\u5bf9\u8c61\u53ef\u4ee5\u5230\u8fbe\uff0c\u4ee5\u4fbf\u5220\u9664\u4e0d\u53ef\u5230\u8fbe\u7684\u5bf9\u8c61\uff0c\u8fd9\u79f0\u4e3a\u6807\u8bb0\uff08marking\uff09\u5bf9\u8c61\u3002

\u3000\u3000\u4e0b\u4e00\u6b65\uff0cgc\u8981\u5220\u9664\u4e0d\u53ef\u5230\u8fbe\u7684\u5bf9\u8c61\u3002\u5220\u9664\u65f6\uff0c\u6709\u4e9bgc\u53ea\u662f\u7b80\u5355\u7684\u626b\u63cf\u5806\u6808\uff0c\u5220\u9664\u672a\u6807\u8bb0\u7684\u672a\u6807\u8bb0\u7684\u5bf9\u8c61\uff0c\u5e76\u91ca\u653e\u5b83\u4eec\u7684\u5185\u5b58\u4ee5\u751f\u6210\u65b0\u7684\u5bf9\u8c61\uff0c\u8fd9\u53eb\u505a\u6e05\u9664\uff08sweeping\uff09\u3002\u8fd9\u79cd\u65b9\u6cd5\u7684\u95ee\u9898\u5728\u4e8e\u5185\u5b58\u4f1a\u5206\u6210\u597d\u591a\u5c0f\u6bb5\uff0c\u800c\u5b83\u4eec\u4e0d\u8db3\u4ee5\u7528\u4e8e\u65b0\u7684\u5bf9\u8c61\uff0c\u4f46\u662f\u7ec4\u5408\u8d77\u6765\u5374\u5f88\u5927\u3002\u56e0\u6b64\uff0c\u8bb8\u591agc\u53ef\u4ee5\u91cd\u65b0\u7ec4\u7ec7\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\uff0c\u5e76\u8fdb\u884c\u538b\u7f29\uff08compact\uff09\uff0c\u5f62\u6210\u53ef\u5229\u7528\u7684\u7a7a\u95f4\u3002

\u3000\u3000\u4e3a\u6b64\uff0cgc\u9700\u8981\u505c\u6b62\u5176\u4ed6\u7684\u6d3b\u52a8\u6d3b\u52a8\u3002\u8fd9\u79cd\u65b9\u6cd5\u610f\u5473\u7740\u6240\u6709\u4e0e\u5e94\u7528\u7a0b\u5e8f\u76f8\u5173\u7684\u5de5\u4f5c\u505c\u6b62\uff0c\u53ea\u6709gc\u8fd0\u884c\u3002\u7ed3\u679c\uff0c\u5728\u54cd\u5e94\u671f\u95f4\u589e\u51cf\u4e86\u8bb8\u591a\u6df7\u6742\u8bf7\u6c42\u3002\u53e6\u5916\uff0c\u66f4\u590d\u6742\u7684 gc\u4e0d\u65ad\u589e\u52a0\u6216\u540c\u65f6\u8fd0\u884c\u4ee5\u51cf\u5c11\u6216\u8005\u6e05\u9664\u5e94\u7528\u7a0b\u5e8f\u7684\u4e2d\u65ad\u3002\u6709\u7684gc\u4f7f\u7528\u5355\u7ebf\u7a0b\u5b8c\u6210\u8fd9\u9879\u5de5\u4f5c\uff0c\u6709\u7684\u5219\u91c7\u7528\u591a\u7ebf\u7a0b\u4ee5\u589e\u52a0\u6548\u7387\u3002

2.\u51e0\u79cd\u5783\u573e\u56de\u6536\u673a\u5236<\/SPAN><\/B>

\u3000\u30002.1.\u6807\u8bb0\uff0d\u6e05\u9664\u6536\u96c6\u5668<\/B>

\u3000\u3000\u8fd9\u79cd\u6536\u96c6\u5668\u9996\u5148\u904d\u5386\u5bf9\u8c61\u56fe\u5e76\u6807\u8bb0\u53ef\u5230\u8fbe\u7684\u5bf9\u8c61\uff0c\u7136\u540e\u626b\u63cf\u5806\u6808\u4ee5\u5bfb\u627e\u672a\u6807\u8bb0\u5bf9\u8c61\u5e76\u91ca\u653e\u5b83\u4eec\u7684\u5185\u5b58\u3002\u8fd9\u79cd\u6536\u96c6\u5668\u4e00\u822c\u4f7f\u7528\u5355\u7ebf\u7a0b\u5de5\u4f5c\u5e76\u505c\u6b62\u5176\u4ed6\u64cd\u4f5c\u3002

\u3000\u30002.2.\u6807\u8bb0\uff0d\u538b\u7f29\u6536\u96c6\u5668<\/B>

\u3000\u3000\u6709\u65f6\u4e5f\u53eb\u6807\u8bb0\uff0d\u6e05\u9664\uff0d\u538b\u7f29\u6536\u96c6\u5668\uff0c\u4e0e\u6807\u8bb0\uff0d\u6e05\u9664\u6536\u96c6\u5668\u6709\u76f8\u540c\u7684\u6807\u8bb0\u9636\u6bb5\u3002\u5728\u7b2c\u4e8c\u9636\u6bb5\uff0c\u5219\u628a\u6807\u8bb0\u5bf9\u8c61\u590d\u5236\u5230\u5806\u6808\u7684\u65b0\u57df\u4e2d\u4ee5\u4fbf\u538b\u7f29\u5806\u6808\u3002\u8fd9\u79cd\u6536\u96c6\u5668\u4e5f\u505c\u6b62\u5176\u4ed6\u64cd\u4f5c\u3002

\u3000\u30002.3.\u590d\u5236\u6536\u96c6\u5668<\/B>

\u3000\u3000\u8fd9\u79cd\u6536\u96c6\u5668\u5c06\u5806\u6808\u5206\u4e3a\u4e24\u4e2a\u57df\uff0c\u5e38\u79f0\u4e3a\u534a\u7a7a\u95f4\u3002\u6bcf\u6b21\u4ec5\u4f7f\u7528\u4e00\u534a\u7684\u7a7a\u95f4\uff0cjvm\u751f\u6210\u7684\u65b0\u5bf9\u8c61\u5219\u653e\u5728\u53e6\u4e00\u534a\u7a7a\u95f4\u4e2d\u3002gc\u8fd0\u884c\u65f6\uff0c\u5b83\u628a\u53ef\u5230\u8fbe\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u534a\u7a7a\u95f4\uff0c\u4ece\u800c\u538b\u7f29\u4e86\u5806\u6808\u3002\u8fd9\u79cd\u65b9\u6cd5\u9002\u7528\u4e8e\u77ed\u751f\u5b58\u671f\u7684\u5bf9\u8c61\uff0c\u6301\u7eed\u590d\u5236\u957f\u751f\u5b58\u671f\u7684\u5bf9\u8c61\u5219\u5bfc\u81f4\u6548\u7387\u964d\u4f4e\u3002

\u3000\u30002.4.\u589e\u91cf\u6536\u96c6\u5668<\/B>

\u3000\u3000\u589e\u91cf\u6536\u96c6\u5668\u628a\u5806\u6808\u5206\u4e3a\u591a\u4e2a\u57df\uff0c\u6bcf\u6b21\u4ec5\u4ece\u4e00\u4e2a\u57df\u6536\u96c6\u5783\u573e\u3002\u8fd9\u4f1a\u9020\u6210\u8f83\u5c0f\u7684\u5e94\u7528\u7a0b\u5e8f\u4e2d\u65ad\u3002

\u3000\u30002.5.\u5206\u4ee3\u6536\u96c6\u5668<\/B>

\u3000\u3000\u8fd9\u79cd\u6536\u96c6\u5668\u628a\u5806\u6808\u5206\u4e3a\u4e24\u4e2a\u6216\u591a\u4e2a\u57df\uff0c\u7528\u4ee5\u5b58\u653e\u4e0d\u540c\u5bff\u547d\u7684\u5bf9\u8c61\u3002jvm\u751f\u6210\u7684\u65b0\u5bf9\u8c61\u4e00\u822c\u653e\u5728\u5176\u4e2d\u7684\u67d0\u4e2a\u57df\u4e2d\u3002\u8fc7\u4e00\u6bb5\u65f6\u95f4\uff0c\u7ee7\u7eed\u5b58\u5728\u7684\u5bf9\u8c61\u5c06\u83b7\u5f97\u4f7f\u7528\u671f\u5e76\u8f6c\u5165\u66f4\u957f\u5bff\u547d\u7684\u57df\u4e2d\u3002\u5206\u4ee3\u6536\u96c6\u5668\u5bf9\u4e0d\u540c\u7684\u57df\u4f7f\u7528\u4e0d\u540c\u7684\u7b97\u6cd5\u4ee5\u4f18\u5316\u6027\u80fd\u3002

\u3000\u30002.6.\u5e76\u53d1\u6536\u96c6\u5668<\/B>

\u3000\u3000\u5e76\u53d1\u6536\u96c6\u5668\u4e0e\u5e94\u7528\u7a0b\u5e8f\u540c\u65f6\u8fd0\u884c\u3002\u8fd9\u4e9b\u6536\u96c6\u5668\u5728\u67d0\u70b9\u4e0a\uff08\u6bd4\u5982\u538b\u7f29\u65f6\uff09\u4e00\u822c\u90fd\u4e0d\u5f97\u4e0d\u505c\u6b62\u5176\u4ed6\u64cd\u4f5c\u4ee5\u5b8c\u6210\u7279\u5b9a\u7684\u4efb\u52a1\uff0c\u4f46\u662f\u56e0\u4e3a\u5176\u4ed6\u5e94\u7528\u7a0b\u5e8f\u53ef\u8fdb\u884c\u5176\u4ed6\u7684\u540e\u53f0\u64cd\u4f5c\uff0c\u6240\u4ee5\u4e2d\u65ad\u5176\u4ed6\u5904\u7406\u7684\u5b9e\u9645\u65f6\u95f4\u5927\u5927\u964d\u4f4e\u3002

\u3000\u30002.7.\u5e76\u884c\u6536\u96c6\u5668<\/B>

\u3000\u3000\u5e76\u884c\u6536\u96c6\u5668\u4f7f\u7528\u67d0\u79cd\u4f20\u7edf\u7684\u7b97\u6cd5\u5e76\u4f7f\u7528\u591a\u7ebf\u7a0b\u5e76\u884c\u7684\u6267\u884c\u5b83\u4eec\u7684\u5de5\u4f5c\u3002\u5728\u591acpu\u673a\u5668\u4e0a\u4f7f\u7528\u591a\u7ebf\u7a0b\u6280\u672f\u53ef\u4ee5\u663e\u8457\u7684\u63d0\u9ad8java\u5e94\u7528\u7a0b\u5e8f\u7684\u53ef\u6269\u5c55\u6027\u3002<\/P>
\n


\n

3.Sun HotSpot<\/SPAN><\/B>

\u3000\u30001.4.1 JVM\u5806\u5927\u5c0f\u7684\u8c03\u6574<\/B>

\u3000\u3000Sun HotSpot 1.4.1\u4f7f\u7528\u5206\u4ee3\u6536\u96c6\u5668\uff0c\u5b83\u628a\u5806\u5206\u4e3a\u4e09\u4e2a\u4e3b\u8981\u7684\u57df\uff1a\u65b0\u57df\u3001\u65e7\u57df\u4ee5\u53ca\u6c38\u4e45\u57df\u3002Jvm\u751f\u6210\u7684\u6240\u6709\u65b0\u5bf9\u8c61\u653e\u5728\u65b0\u57df\u4e2d\u3002\u4e00\u65e6\u5bf9\u8c61\u7ecf\u5386\u4e86\u4e00\u5b9a\u6570\u91cf\u7684\u5783\u573e\u6536\u96c6\u5faa\u73af\u540e\uff0c\u4fbf\u83b7\u5f97\u4f7f\u7528\u671f\u5e76\u8fdb\u5165\u65e7\u57df\u3002\u5728\u6c38\u4e45\u57df\u4e2djvm\u5219\u5b58\u50a8class\u548cmethod\u5bf9\u8c61\u3002\u5c31\u914d\u7f6e\u800c\u8a00\uff0c\u6c38\u4e45\u57df\u662f\u4e00\u4e2a\u72ec\u7acb\u57df\u5e76\u4e14\u4e0d\u8ba4\u4e3a\u662f\u5806\u7684\u4e00\u90e8\u5206\u3002

\u3000\u3000\u4e0b\u9762\u4ecb\u7ecd\u5982\u4f55\u63a7\u5236\u8fd9\u4e9b\u57df\u7684\u5927\u5c0f\u3002\u53ef\u4f7f\u7528-Xms\u548c-Xmx \u63a7\u5236\u6574\u4e2a\u5806\u7684\u539f\u59cb\u5927\u5c0f\u6216\u6700\u5927\u503c\u3002

\u3000\u3000\u4e0b\u9762\u7684\u547d\u4ee4\u662f\u628a\u521d\u59cb\u5927\u5c0f\u8bbe\u7f6e\u4e3a128M\uff1a

\u3000\u3000java \u2013Xms128m

\u3000\u3000\u2013Xmx256m\u4e3a\u63a7\u5236\u65b0\u57df\u7684\u5927\u5c0f\uff0c\u53ef\u4f7f\u7528-XX:NewRatio\u8bbe\u7f6e\u65b0\u57df\u5728\u5806\u4e2d\u6240\u5360\u7684\u6bd4\u4f8b\u3002

\u3000\u3000\u4e0b\u9762\u7684\u547d\u4ee4\u628a\u6574\u4e2a\u5806\u8bbe\u7f6e\u6210128m\uff0c\u65b0\u57df\u6bd4\u7387\u8bbe\u7f6e\u62103\uff0c\u5373\u65b0\u57df\u4e0e\u65e7\u57df\u6bd4\u4f8b\u4e3a1\uff1a3\uff0c\u65b0\u57df\u4e3a\u5806\u76841\/4\u621632M\uff1a

java \u2013Xms128m \u2013Xmx128m
\u2013XX:NewRatio =3\u53ef\u4f7f\u7528-XX:NewSize\u548c-XX:MaxNewsize\u8bbe\u7f6e\u65b0\u57df\u7684\u521d\u59cb\u503c\u548c\u6700\u5927\u503c\u3002

\u3000\u3000\u4e0b\u9762\u7684\u547d\u4ee4\u628a\u65b0\u57df\u7684\u521d\u59cb\u503c\u548c\u6700\u5927\u503c\u8bbe\u7f6e\u621064m:

java \u2013Xms256m \u2013Xmx256m \u2013Xmn64m

\u3000\u3000\u6c38\u4e45\u57df\u9ed8\u8ba4\u5927\u5c0f\u4e3a4m\u3002\u8fd0\u884c\u7a0b\u5e8f\u65f6\uff0cjvm\u4f1a\u8c03\u6574\u6c38\u4e45\u57df\u7684\u5927\u5c0f\u4ee5\u6ee1\u8db3\u9700\u8981\u3002\u6bcf\u6b21\u8c03\u6574\u65f6\uff0cjvm\u4f1a\u5bf9\u5806\u8fdb\u884c\u4e00\u6b21\u5b8c\u5168\u7684\u5783\u573e\u6536\u96c6\u3002

\u3000\u3000\u4f7f\u7528-XX:MaxPerSize\u6807\u5fd7\u6765\u589e\u52a0\u6c38\u4e45\u57df\u642d\u5927\u5c0f\u3002\u5728WebLogic Server\u5e94\u7528\u7a0b\u5e8f\u52a0\u8f7d\u8f83\u591a\u7c7b\u65f6\uff0c\u7ecf\u5e38\u9700\u8981\u589e\u52a0\u6c38\u4e45\u57df\u7684\u6700\u5927\u503c\u3002\u5f53jvm\u52a0\u8f7d\u7c7b\u65f6\uff0c\u6c38\u4e45\u57df\u4e2d\u7684\u5bf9\u8c61\u6025\u5267\u589e\u52a0\uff0c\u4ece\u800c\u4f7fjvm\u4e0d\u65ad\u8c03\u6574\u6c38\u4e45\u57df\u5927\u5c0f\u3002\u4e3a\u4e86\u907f\u514d\u8c03\u6574\uff0c\u53ef\u4f7f\u7528-XX:PerSize\u6807\u5fd7\u8bbe\u7f6e\u521d\u59cb\u503c\u3002

\u3000\u3000\u4e0b\u9762\u628a\u6c38\u4e45\u57df\u521d\u59cb\u503c\u8bbe\u7f6e\u621032m\uff0c\u6700\u5927\u503c\u8bbe\u7f6e\u621064m\u3002

java -Xms512m -Xmx512m -Xmn128m -XX:PermSize=32m -XX:MaxPermSize=64m

\u3000\u3000\u9ed8\u8ba4\u72b6\u6001\u4e0b\uff0cHotSpot\u5728\u65b0\u57df\u4e2d\u4f7f\u7528\u590d\u5236\u6536\u96c6\u5668\u3002\u8be5\u57df\u4e00\u822c\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206\u3002\u7b2c\u4e00\u90e8\u5206\u4e3aEden\uff0c\u7528\u4e8e\u751f\u6210\u65b0\u7684\u5bf9\u8c61\u3002\u53e6\u4e24\u90e8\u5206\u79f0\u4e3a\u6551\u52a9\u7a7a\u95f4\uff0c\u5f53Eden \u5145\u6ee1\u65f6\uff0c\u6536\u96c6\u5668\u505c\u6b62\u5e94\u7528\u7a0b\u5e8f\uff0c\u628a\u6240\u6709\u53ef\u5230\u8fbe\u5bf9\u8c61\u590d\u5236\u5230\u5f53\u524d\u7684from\u6551\u52a9\u7a7a\u95f4\uff0c\u4e00\u65e6\u5f53\u524d\u7684from\u6551\u52a9\u7a7a\u95f4\u5145\u6ee1\uff0c\u6536\u96c6\u5668\u5219\u628a\u53ef\u5230\u8fbe\u5bf9\u8c61\u590d\u5236\u5230\u5f53\u524d\u7684to\u6551\u52a9\u7a7a\u95f4\u3002From\u548cto\u6551\u52a9\u7a7a\u95f4\u4e92\u6362\u89d2\u8272\u3002\u7ef4\u6301\u6d3b\u52a8\u7684\u5bf9\u8c61\u5c06\u5728\u6551\u52a9\u7a7a\u95f4\u4e0d\u65ad\u590d\u5236\uff0c\u76f4\u5230\u5b83\u4eec\u83b7\u5f97\u4f7f\u7528\u671f\u5e76\u8f6c\u5165\u65e7\u57df\u3002\u4f7f\u7528-XX:SurvivorRatio \u53ef\u63a7\u5236\u65b0\u57df\u5b50\u7a7a\u95f4\u7684\u5927\u5c0f\u3002

\u3000\u3000\u540cNewRation\u4e00\u6837\uff0cSurvivorRation\u89c4\u5b9a\u67d0\u6551\u52a9\u57df\u4e0eEden\u7a7a\u95f4\u7684\u6bd4\u503c\u3002\u6bd4\u5982\uff0c\u4ee5\u4e0b\u547d\u4ee4\u628a\u65b0\u57df\u8bbe\u7f6e\u621064m\uff0cEden\u536032m\uff0c\u6bcf\u4e2a\u6551\u52a9\u57df\u5404\u536016m\uff1a

java -Xms256m -Xmx256m -Xmn64m -XX:SurvivorRation =2

\u3000\u3000\u5982\u524d\u6240\u8ff0\uff0c\u9ed8\u8ba4\u72b6\u6001\u4e0bHotSpot\u5bf9\u65b0\u57df\u4f7f\u7528\u590d\u5236\u6536\u96c6\u5668\uff0c\u5bf9\u65e7\u57df\u4f7f\u7528\u6807\u8bb0\uff0d\u6e05\u9664\uff0d\u538b\u7f29\u6536\u96c6\u5668\u3002\u5728\u65b0\u57df\u4e2d\u4f7f\u7528\u590d\u5236\u6536\u96c6\u5668\u6709\u5f88\u591a\u610f\u4e49\uff0c\u56e0\u4e3a\u5e94\u7528\u7a0b\u5e8f\u751f\u6210\u7684\u5927\u90e8\u5206\u5bf9\u8c61\u662f\u77ed\u5bff\u547d\u7684\u3002\u7406\u60f3\u72b6\u6001\u4e0b\uff0c\u6240\u6709\u8fc7\u6e21\u5bf9\u8c61\u5728\u79fb\u51faEden\u7a7a\u95f4\u65f6\u5c06\u88ab\u6536\u96c6\u3002\u5982\u679c\u80fd\u591f\u8fd9\u6837\u7684\u8bdd\uff0c\u5e76\u4e14\u79fb\u51faEden\u7a7a\u95f4\u7684\u5bf9\u8c61\u662f\u957f\u5bff\u547d\u7684\uff0c\u90a3\u4e48\u7406\u8bba\u4e0a\u53ef\u4ee5\u7acb\u5373\u628a\u5b83\u4eec\u79fb\u8fdb\u65e7\u57df\uff0c\u907f\u514d\u5728\u6551\u52a9\u7a7a\u95f4\u53cd\u590d\u590d\u5236\u3002\u4f46\u662f\uff0c\u5e94\u7528\u7a0b\u5e8f\u4e0d\u80fd\u9002\u5408\u8fd9\u79cd\u7406\u60f3\u72b6\u6001\uff0c\u56e0\u4e3a\u5b83\u4eec\u6709\u4e00\u5c0f\u90e8\u5206\u4e2d\u957f\u5bff\u547d\u7684\u5bf9\u8c61\u3002\u6700\u597d\u662f\u4fdd\u6301\u8fd9\u4e9b\u4e2d\u957f\u5bff\u547d\u7684\u5bf9\u8c61\u5e76\u653e\u5728\u65b0\u57df\u4e2d\uff0c\u56e0\u4e3a\u590d\u5236\u5c0f\u90e8\u5206\u7684\u5bf9\u8c61\u603b\u6bd4\u538b\u7f29\u65e7\u57df\u5ec9\u4ef7\u3002\u4e3a\u63a7\u5236\u65b0\u57df\u4e2d\u5bf9\u8c61\u7684\u590d\u5236\uff0c\u53ef\u7528-XX:TargetSurvivorRatio\u63a7\u5236\u6551\u52a9\u7a7a\u95f4\u7684\u6bd4\u4f8b\uff08\u8be5\u503c\u662f\u8bbe\u7f6e\u6551\u52a9\u7a7a\u95f4\u7684\u4f7f\u7528\u6bd4\u4f8b\u3002\u5982\u6551\u52a9\u7a7a\u95f4\u4f4d1M\uff0c\u8be5\u503c50\u8868\u793a\u53ef\u7528500K\uff09\u3002\u8be5\u503c\u662f\u4e00\u4e2a\u767e\u5206\u6bd4\uff0c\u9ed8\u8ba4\u503c\u662f50\u3002\u5f53\u8f83\u5927\u7684\u5806\u6808\u4f7f\u7528\u8f83\u4f4e\u7684 sruvivorratio\u65f6\uff0c\u5e94\u589e\u52a0\u8be5\u503c\u523080\u81f390\uff0c\u4ee5\u66f4\u597d\u5229\u7528\u6551\u52a9\u7a7a\u95f4\u3002\u7528-XX:maxtenuring threshold\u53ef\u63a7\u5236\u4e0a\u9650\u3002

\u3000\u3000\u4e3a\u653e\u7f6e\u6240\u6709\u7684\u590d\u5236\u5168\u90e8\u53d1\u751f\u4ee5\u53ca\u5e0c\u671b\u5bf9\u8c61\u4eceeden\u6269\u5c55\u5230\u65e7\u57df\uff0c\u53ef\u4ee5\u628aMaxTenuring Threshold\u8bbe\u7f6e\u62100\u3002\u8bbe\u7f6e\u5b8c\u6210\u540e\uff0c\u5b9e\u9645\u4e0a\u5c31\u4e0d\u518d\u4f7f\u7528\u6551\u52a9\u7a7a\u95f4\u4e86\uff0c\u56e0\u6b64\u5e94\u628aSurvivorRatio\u8bbe\u6210\u6700\u5927\u503c\u4ee5\u6700\u5927\u5316Eden\u7a7a\u95f4\uff0c\u8bbe\u7f6e\u5982\u4e0b\uff1a

java \u2026 -XX:MaxTenuringThreshold=0 \u2013XX:SurvivorRatio\uff1d50000 \u2026

4.BEA JRockit JVM\u7684\u4f7f\u7528<\/SPAN><\/B>

\u3000\u3000Bea WebLogic 8.1\u4f7f\u7528\u7684\u65b0\u7684JVM\u7528\u4e8eIntel\u5e73\u53f0\u3002\u5728Bea\u5b89\u88c5\u5b8c\u6bd5\u7684\u76ee\u5f55\u4e0b\u53ef\u4ee5\u770b\u5230\u6709\u4e00\u4e2a\u7c7b\u4f3c\u4e8ejrockit81sp1_141_03\u7684\u6587\u4ef6\u5939\u3002\u8fd9\u5c31\u662f Bea\u65b0JVM\u6240\u5728\u76ee\u5f55\u3002\u4e0d\u540c\u4e8eHotSpot\u628aJava\u5b57\u8282\u7801\u7f16\u8bd1\u6210\u672c\u5730\u7801\uff0c\u5b83\u9884\u5148\u7f16\u8bd1\u6210\u7c7b\u3002JRockit\u8fd8\u63d0\u4f9b\u4e86\u66f4\u7ec6\u81f4\u7684\u529f\u80fd\u7528\u4ee5\u89c2\u5bdfJVM\u7684\u8fd0\u884c\u72b6\u6001\uff0c\u4e3b\u8981\u662f\u72ec\u7acb\u7684GUI\u63a7\u5236\u53f0\uff08\u53ea\u80fd\u9002\u7528\u4e8e\u4f7f\u7528Jrockit\u624d\u80fd\u4f7f\u7528jrockit81sp1_141_03\u81ea\u5e26\u7684console\u76d1\u63a7\u4e00\u4e9bcpu\u53ca memory\u53c2\u6570\uff09\u6216\u8005WebLogic Server\u63a7\u5236\u53f0\u3002

\u3000\u3000Bea JRockit JVM\u652f\u63014\u79cd\u5783\u573e\u6536\u96c6\u5668\uff1a

\u3000\u30004.1.1.\u5206\u4ee3\u590d\u5236\u6536\u96c6\u5668<\/B>

\u3000\u3000\u5b83\u4e0e\u9ed8\u8ba4\u7684\u5206\u4ee3\u6536\u96c6\u5668\u5de5\u4f5c\u7b56\u7565\u7c7b\u4f3c\u3002\u5bf9\u8c61\u5728\u65b0\u57df\u4e2d\u5206\u914d\uff0c\u5373JRockit\u6587\u6863\u4e2d\u7684nursery\u3002\u8fd9\u79cd\u6536\u96c6\u5668\u6700\u9002\u5408\u5355cpu\u673a\u4e0a\u5c0f\u578b\u5806\u64cd\u4f5c\u3002

\u3000\u30004.1.2.\u5355\u7a7a\u95f4\u5e76\u53d1\u6536\u96c6\u5668<\/B>

\u3000\u3000\u8be5\u6536\u96c6\u5668\u4f7f\u7528\u5b8c\u6574\u5806\uff0c\u5e76\u4e0e\u80cc\u666f\u7ebf\u7a0b\u5171\u540c\u5de5\u4f5c\u3002\u5c3d\u7ba1\u8fd9\u79cd\u6536\u96c6\u5668\u53ef\u4ee5\u6d88\u9664\u4e2d\u65ad\uff0c\u4f46\u662f\u6536\u96c6\u5668\u9700\u82b1\u8d39\u8f83\u957f\u7684\u65f6\u95f4\u5bfb\u627e\u6b7b\u5bf9\u8c61\uff0c\u800c\u4e14\u5904\u7406\u5e94\u7528\u7a0b\u5e8f\u65f6\u6536\u96c6\u5668\u7ecf\u5e38\u8fd0\u884c\u3002\u5982\u679c\u5904\u7406\u5668\u4e0d\u80fd\u5e94\u4ed8\u5e94\u7528\u7a0b\u5e8f\u4ea7\u751f\u7684\u5783\u573e\uff0c\u5b83\u4f1a\u4e2d\u65ad\u5e94\u7528\u7a0b\u5e8f\u5e76\u5173\u95ed\u6536\u96c6\u3002

\u3000\u3000\u5206\u4ee3\u5e76\u53d1\u6536\u96c6\u5668\u8fd9\u79cd\u6536\u96c6\u5668\u5728\u62a4\u7406\u57df\u4f7f\u7528\u6392\u5b83\u590d\u5236\u6536\u96c6\u5668\uff0c\u5728\u65e7\u57df\u4e2d\u5219\u4f7f\u7528\u5e76\u53d1\u6536\u96c6\u5668\u3002\u7531\u4e8e\u5b83\u6bd4\u5355\u7a7a\u95f4\u5171\u540c\u53d1\u751f\u6536\u96c6\u5668\u4e2d\u65ad\u9891\u7e41\uff0c\u56e0\u6b64\u5b83\u9700\u8981\u8f83\u5c11\u7684\u5185\u5b58\uff0c\u5e94\u7528\u7a0b\u5e8f\u7684\u8fd0\u884c\u6548\u7387\u4e5f\u8f83\u9ad8\uff0c\u6ce8\u610f\uff0c\u8fc7\u5c0f\u7684\u62a4\u7406\u57df\u53ef\u4ee5\u5bfc\u81f4\u5927\u91cf\u7684\u4e34\u65f6\u5bf9\u8c61\u88ab\u6269\u5c55\u5230\u65e7\u57df\u4e2d\u3002\u8fd9\u4f1a\u9020\u6210\u6536\u96c6\u5668\u8d85\u8d1f\u8377\u8fd0\u4f5c\uff0c\u751a\u81f3\u91c7\u7528\u6392\u5b83\u6027\u5de5\u4f5c\u65b9\u5f0f\u5b8c\u6210\u6536\u96c6\u3002

\u3000\u30004.1.3.\u5e76\u884c\u6536\u96c6\u5668<\/B>

\u3000\u3000\u8be5\u6536\u96c6\u5668\u4e5f\u505c\u6b62\u5176\u4ed6\u8fdb\u7a0b\u7684\u5de5\u4f5c\uff0c\u4f46\u4f7f\u7528\u591a\u7ebf\u7a0b\u4ee5\u52a0\u901f\u6536\u96c6\u8fdb\u7a0b\u3002\u5c3d\u7ba1\u5b83\u6bd4\u5176\u4ed6\u7684\u6536\u96c6\u5668\u6613\u4e8e\u5f15\u8d77\u957f\u65f6\u95f4\u7684\u4e2d\u65ad\uff0c\u4f46\u4e00\u822c\u80fd\u66f4\u597d\u7684\u5229\u7528\u5185\u5b58\uff0c\u7a0b\u5e8f\u6548\u7387\u4e5f\u8f83\u9ad8\u3002

\u3000\u3000\u9ed8\u8ba4\u72b6\u6001\u4e0b\uff0cJRockit\u4f7f\u7528\u5206\u4ee3\u5e76\u53d1\u6536\u96c6\u5668\u3002\u8981\u6539\u53d8\u6536\u96c6\u5668\uff0c\u53ef\u4f7f\u7528-Xgc:\uff0c\u5bf9\u5e94\u56db\u4e2a\u6536\u96c6\u5668\u5206\u522b\u4e3a gencopy\uff0csinglecon\uff0cgencon\u4ee5\u53caparallel\u3002\u53ef\u4f7f\u7528-Xms\u548c-Xmx\u8bbe\u7f6e\u5806\u7684\u521d\u59cb\u5927\u5c0f\u548c\u6700\u5927\u503c\u3002\u8981\u8bbe\u7f6e\u62a4\u7406\u57df\uff0c\u5219\u4f7f\u7528- Xns:java \u2013jrockit \u2013Xms512m \u2013Xmx512m \u2013Xgc:gencon \u2013Xns128m\u2026\u5c3d\u7ba1JRockit\u652f\u6301-verbose:gc\u5f00\u5173\uff0c\u4f46\u5b83\u8f93\u51fa\u7684\u4fe1\u606f\u4f1a\u56e0\u6536\u96c6\u5668\u7684\u4e0d\u540c\u800c\u5f02\u3002JRockit\u8fd8\u652f\u6301memory\u3001 load\u548ccodegen\u7684\u8f93\u51fa\u3002

\u3000\u3000\u6ce8\u610f \uff1a\u5982\u679c \u4f7f\u7528JRockit JVM\u7684\u8bdd\u8fd8\u53ef\u4ee5\u4f7f\u7528WLS\u81ea\u5e26\u7684console\uff08C:\\bea\\jrockit81sp1_141_03\\bin\u4e0b\uff09\u6765\u76d1\u63a7\u4e00\u4e9b\u6570\u636e\uff0c\u5982cpu\uff0c memery\u7b49\u3002\u8981\u60f3\u80fd\u6784\u76d1\u63a7\u5fc5\u987b\u5728\u542f\u52a8\u670d\u52a1\u65f6startWeblogic.cmd\u4e2d\u52a0\u5165\uff0dXmanagement\u53c2\u6570\u3002<\/P>
\n

5.\u5982\u4f55\u4eceJVM\u4e2d\u83b7\u53d6\u4fe1\u606f\u6765\u8fdb\u884c\u8c03\u6574<\/SPAN>

<\/STRONG>\u3000\u3000-verbose.gc\u5f00\u5173\u53ef\u663e\u793agc\u7684\u64cd\u4f5c\u5185\u5bb9\u3002\u6253\u5f00\u5b83\uff0c\u53ef\u4ee5\u663e\u793a\u6700\u5fd9\u548c\u6700\u7a7a\u95f2\u6536\u96c6\u884c\u4e3a\u53d1\u751f\u7684\u65f6\u95f4\u3001\u6536\u96c6\u524d\u540e\u7684\u5185\u5b58\u5927\u5c0f\u3001\u6536\u96c6\u9700\u8981\u7684\u65f6\u95f4\u7b49\u3002\u6253\u5f00- xx:+ printgcdetails\u5f00\u5173\uff0c\u53ef\u4ee5\u8be6\u7ec6\u4e86\u89e3gc\u4e2d\u7684\u53d8\u5316\u3002\u6253\u5f00-XX: + PrintGCTimeStamps\u5f00\u5173\uff0c\u53ef\u4ee5\u4e86\u89e3\u8fd9\u4e9b\u5783\u573e\u6536\u96c6\u53d1\u751f\u7684\u65f6\u95f4\uff0c\u81eajvm\u542f\u52a8\u4ee5\u540e\u4ee5\u79d2\u8ba1\u91cf\u3002\u6700\u540e\uff0c\u901a\u8fc7-xx: + PrintHeapAtGC\u5f00\u5173\u4e86\u89e3\u5806\u7684\u66f4\u8be6\u7ec6\u7684\u4fe1\u606f\u3002\u4e3a\u4e86\u4e86\u89e3\u65b0\u57df\u7684\u60c5\u51b5\uff0c\u53ef\u4ee5\u901a\u8fc7-XX:=PrintTenuringDistribution\u5f00\u5173\u4e86\u89e3\u83b7\u5f97\u4f7f\u7528\u671f\u7684\u5bf9\u8c61\u6743\u3002

6.Pdm\u7cfb\u7edfJVM\u8c03\u6574<\/SPAN><\/B>

\u3000\u30006.1.\u670d\u52a1\u5668\uff1a\u524d\u63d0\u5185\u5b581G \u5355CPU<\/B>

\u3000\u3000\u53ef\u901a\u8fc7\u5982\u4e0b\u53c2\u6570\u8fdb\u884c\u8c03\u6574\uff1a\uff0dserver \u542f\u7528\u670d\u52a1\u5668\u6a21\u5f0f\uff08\u5982\u679cCPU\u591a\uff0c\u670d\u52a1\u5668\u673a\u5efa\u8bae\u4f7f\u7528\u6b64\u9879\uff09

\u3000\u3000\uff0dXms,\uff0dXmx\u4e00\u822c\u8bbe\u4e3a\u540c\u6837\u5927\u5c0f\u3002 800m

\u3000\u3000\uff0dXmn \u662f\u5c06NewSize\u4e0eMaxNewSize\u8bbe\u4e3a\u4e00\u81f4\u3002320m

\u3000\u3000\uff0dXX:PerSize 64m

\u3000\u3000\uff0dXX:NewSize 320m \u6b64\u503c\u8bbe\u5927\u53ef\u8c03\u5927\u65b0\u5bf9\u8c61\u533a\uff0c\u51cf\u5c11Full GC\u6b21\u6570

\u3000\u3000\uff0dXX:MaxNewSize 320m

\u3000\u3000\uff0dXX:NewRato NewSize\u8bbe\u4e86\u53ef\u4e0d\u8bbe\u3002

\u3000\u3000\uff0dXX: SurvivorRatio

\u3000\u3000\uff0dXX:userParNewGC \u53ef\u7528\u6765\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6

\u3000\u3000\uff0dXX:ParallelGCThreads \u53ef\u7528\u6765\u589e\u52a0\u5e76\u884c\u5ea6

\u3000\u3000\uff0dXXUseParallelGC \u8bbe\u7f6e\u540e\u53ef\u4ee5\u4f7f\u7528\u5e76\u884c\u6e05\u9664\u6536\u96c6\u5668

\u3000\u3000\uff0dXX\uff1aUseAdaptiveSizePolicy \u4e0e\u4e0a\u9762\u4e00\u4e2a\u8054\u5408\u4f7f\u7528\u6548\u679c\u66f4\u597d\uff0c\u5229\u7528\u5b83\u53ef\u4ee5\u81ea\u52a8\u4f18\u5316\u65b0\u57df\u5927\u5c0f\u4ee5\u53ca\u6551\u52a9\u7a7a\u95f4\u6bd4\u503c

\u3000\u30006.2.\u5ba2\u6237\u673a\uff1a\u901a\u8fc7\u5728JNLP\u6587\u4ef6\u4e2d\u8bbe\u7f6e\u53c2\u6570\u6765\u8c03\u6574\u5ba2\u6237\u7aefJVM<\/B>

\u3000\u3000JNLP\u4e2d\u53c2\u6570\uff1ainitial-heap-size\u548cmax-heap-size

\u3000\u3000\u8fd9\u53ef\u4ee5\u5728framework\u7684RequestManager\u4e2d\u751f\u6210JNLP\u6587\u4ef6\u65f6\u52a0\u5165\u4e0a\u8ff0\u53c2\u6570\uff0c\u4f46\u662f\u8fd9\u4e9b\u503c\u662f\u8981\u6c42\u6839\u636e\u5ba2\u6237\u673a\u7684\u786c\u4ef6\u72b6\u6001\u53d8\u5316\u7684\uff08\u5982\u5ba2\u6237\u673a\u7684\u5185\u5b58\u5927\u5c0f\u7b49\uff09\u3002\u5efa\u8bae\u8fd9\u4e24\u4e2a\u53c2\u6570\u503c\u8bbe\u4e3a\u5ba2\u6237\u673a\u53ef\u7528\u5185\u5b58\u768460\uff05\uff08\u6709\u5f85\u6d4b\u8bd5\uff09\u3002\u4e3a\u4e86\u5728\u52a8\u6001\u751f\u6210JNLP\u65f6\u4ee5\u4e0a\u4e24\u4e2a\u53c2\u6570\u503c\u80fd\u591f\u968f\u5ba2\u6237\u673a\u4e0d\u540c\u800c\u4e0d\u540c\uff0c\u53ef\u9760\u8651\u83b7\u5f97\u5ba2\u6237\u673a\u7cfb\u7edf\u4fe1\u606f\u5e76\u5c06\u8fd9\u4e9b\u5d4c\u5230\u9996\u9875index.jsp\u4e2d\u4f5c\u4e3a\u8fde\u63a5\u8bf7\u6c42\u7684\u53c2\u6570\u3002

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