“`\u8003\u5bdf\u70b9\uff1aJVM<\/p>\n
\u5783\u573e\u56de\u6536\u7b97\u6cd5<\/p>\n
\u6807\u8bb0\u6e05\u9664<\/p>\n
\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5c06\u5783\u573e\u56de\u6536\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a\u6807\u8bb0\u9636\u6bb5\u548c\u6e05\u9664\u9636\u6bb5\u3002\u5728\u6807\u8bb0\u9636\u6bb5\u9996\u5148\u901a\u8fc7\u6839\u8282\u70b9\uff0c\u6807\u8bb0\u6240\u6709\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u7684\u5bf9\u8c61\uff0c\u672a\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\u5c31\u662f\u672a\u88ab\u5f15\u7528\u7684\u5783\u573e\u5bf9\u8c61\u3002\u7136\u540e\uff0c\u5728\u6e05\u9664\u9636\u6bb5\uff0c\u6e05\u9664\u6240\u6709\u672a\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\u3002\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u5e26\u6765\u7684\u4e00\u4e2a\u95ee\u9898\u662f\u4f1a\u5b58\u5728\u5927\u91cf\u7684\u7a7a\u95f4\u788e\u7247\uff0c\u56e0\u4e3a\u56de\u6536\u540e\u7684\u7a7a\u95f4\u662f\u4e0d\u8fde\u7eed\u7684\uff0c\u8fd9\u6837\u7ed9\u5927\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u7684\u65f6\u5019\u53ef\u80fd\u4f1a\u63d0\u524d\u89e6\u53d1full gc\u3002<\/p>\n
\u590d\u5236\u7b97\u6cd5<\/p>\n
\u5c06\u73b0\u6709\u7684\u5185\u5b58\u7a7a\u95f4\u5206\u4e3a\u4e24\u5feb\uff0c\u6bcf\u6b21\u53ea\u4f7f\u7528\u5176\u4e2d\u4e00\u5757\uff0c\u5728\u5783\u573e\u56de\u6536\u65f6\u5c06\u6b63\u5728\u4f7f\u7528\u7684\u5185\u5b58\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230\u672a\u88ab\u4f7f\u7528\u7684\u5185\u5b58\u5757\u4e2d\uff0c\u4e4b\u540e\uff0c\u6e05\u9664\u6b63\u5728\u4f7f\u7528\u7684\u5185\u5b58\u5757\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u4ea4\u6362\u4e24\u4e2a\u5185\u5b58\u7684\u89d2\u8272\uff0c\u5b8c\u6210\u5783\u573e\u56de\u6536\u3002<\/p>\n
\u73b0\u5728\u7684\u5546\u4e1a\u865a\u62df\u673a\u90fd\u91c7\u7528\u8fd9\u79cd\u6536\u96c6\u7b97\u6cd5\u6765\u56de\u6536\u65b0\u751f\u4ee3\uff0cIBM\u7814\u7a76\u8868\u660e\u65b0\u751f\u4ee3\u4e2d\u7684\u5bf9\u8c6198%\u662f\u671d\u5915\u751f\u6b7b\u7684\uff0c\u6240\u4ee5\u5e76\u4e0d\u9700\u8981\u6309\u71671:1\u7684\u6bd4\u4f8b\u5212\u5206\u5185\u5b58\u7a7a\u95f4\uff0c\u800c\u662f\u5c06\u5185\u5b58\u5206\u4e3a\u4e00\u5757\u8f83\u5927\u7684Eden\u7a7a\u95f4\u548c\u4e24\u5757\u8f83\u5c0f\u7684Survivor\u7a7a\u95f4\uff0c\u6bcf\u6b21\u4f7f\u7528Eden\u548c\u5176\u4e2d\u7684\u4e00\u5757Survivor\u3002\u5f53\u56de\u6536\u65f6\uff0c\u5c06Eden\u548cSurvivor\u4e2d\u8fd8\u5b58\u6d3b\u7740\u7684\u5bf9\u8c61\u4e00\u6b21\u6027\u5730\u62f7\u8d1d\u5230\u53e6\u5916\u4e00\u4e2aSurvivor\u7a7a\u95f4\u4e0a\uff0c\u6700\u540e\u6e05\u7406\u6389Eden\u548c\u521a\u624d\u7528\u8fc7\u7684Survivor\u7684\u7a7a\u95f4\u3002HotSpot\u865a\u62df\u673a\u9ed8\u8ba4Eden\u548cSurvivor\u7684\u5927\u5c0f\u6bd4\u4f8b\u662f8:1(\u53ef\u4ee5\u901a\u8fc7-SurvivorRattio\u6765\u914d\u7f6e)\uff0c\u4e5f\u5c31\u662f\u6bcf\u6b21\u65b0\u751f\u4ee3\u4e2d\u53ef\u7528\u5185\u5b58\u7a7a\u95f4\u4e3a\u6574\u4e2a\u65b0\u751f\u4ee3\u5bb9\u91cf\u768490%\uff0c\u53ea\u670910%\u7684\u5185\u5b58\u4f1a\u88ab\u201c\u6d6a\u8d39\u201d\u3002\u5f53\u7136\uff0c98%\u7684\u5bf9\u8c61\u53ef\u56de\u6536\u53ea\u662f\u4e00\u822c\u573a\u666f\u4e0b\u7684\u6570\u636e\uff0c\u6211\u4eec\u6ca1\u6709\u529e\u6cd5\u4fdd\u8bc1\u56de\u6536\u90fd\u53ea\u6709\u4e0d\u591a\u4e8e10%\u7684\u5bf9\u8c61\u5b58\u6d3b\uff0c\u5f53Survivor\u7a7a\u95f4\u4e0d\u591f\u7528\u65f6\uff0c\u9700\u8981\u4f9d\u8d56\u5176\u4ed6\u5185\u5b58\uff08\u8fd9\u91cc\u6307\u8001\u5e74\u4ee3\uff09\u8fdb\u884c\u5206\u914d\u62c5\u4fdd\u3002<\/p>\n
\u6807\u8bb0\u6574\u7406<\/p>\n
\u590d\u5236\u7b97\u6cd5\u7684\u9ad8\u6548\u6027\u662f\u5efa\u7acb\u5728\u5b58\u6d3b\u5bf9\u8c61\u5c11\u3001\u5783\u573e\u5bf9\u8c61\u591a\u7684\u524d\u63d0\u4e0b\u7684\u3002\u8fd9\u79cd\u60c5\u51b5\u5728\u65b0\u751f\u4ee3\u7ecf\u5e38\u53d1\u751f\uff0c\u4f46\u662f\u5728\u8001\u5e74\u4ee3\u66f4\u5e38\u89c1\u7684\u60c5\u51b5\u662f\u5927\u90e8\u5206\u5bf9\u8c61\u90fd\u662f\u5b58\u6d3b\u5bf9\u8c61\u3002\u5982\u679c\u4f9d\u7136\u4f7f\u7528\u590d\u5236\u7b97\u6cd5\uff0c\u7531\u4e8e\u5b58\u6d3b\u7684\u5bf9\u8c61\u8f83\u591a\uff0c\u590d\u5236\u7684\u6210\u672c\u4e5f\u5c06\u5f88\u9ad8\u3002<\/p>\n
\u6807\u8bb0-\u538b\u7f29\u7b97\u6cd5\u662f\u4e00\u79cd\u8001\u5e74\u4ee3\u7684\u56de\u6536\u7b97\u6cd5\uff0c\u5b83\u5728\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u57fa\u7840\u4e0a\u505a\u4e86\u4e00\u4e9b\u4f18\u5316\u3002\u9996\u5148\u4e5f\u9700\u8981\u4ece\u6839\u8282\u70b9\u5f00\u59cb\u5bf9\u6240\u6709\u53ef\u8fbe\u5bf9\u8c61\u505a\u4e00\u6b21\u6807\u8bb0\uff0c\u4f46\u4e4b\u540e\uff0c\u5b83\u5e76\u4e0d\u7b80\u5355\u5730\u6e05\u7406\u672a\u6807\u8bb0\u7684\u5bf9\u8c61\uff0c\u800c\u662f\u5c06\u6240\u6709\u7684\u5b58\u6d3b\u5bf9\u8c61\u538b\u7f29\u5230\u5185\u5b58\u7684\u4e00\u7aef\u3002\u4e4b\u540e\uff0c\u6e05\u7406\u8fb9\u754c\u5916\u6240\u6709\u7684\u7a7a\u95f4\u3002\u8fd9\u79cd\u65b9\u6cd5\u65e2\u907f\u514d\u4e86\u788e\u7247\u7684\u4ea7\u751f\uff0c\u53c8\u4e0d\u9700\u8981\u4e24\u5757\u76f8\u540c\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u56e0\u6b64\uff0c\u5176\u6027\u4ef7\u6bd4\u6bd4\u8f83\u9ad8\u3002<\/p>\n
\u589e\u91cf\u7b97\u6cd5<\/p>\n
\u589e\u91cf\u7b97\u6cd5\u7684\u57fa\u672c\u601d\u60f3\u662f\uff0c\u5982\u679c\u4e00\u6b21\u6027\u5c06\u6240\u6709\u7684\u5783\u573e\u8fdb\u884c\u5904\u7406\uff0c\u9700\u8981\u9020\u6210\u7cfb\u7edf\u957f\u65f6\u95f4\u7684\u505c\u987f\uff0c\u90a3\u4e48\u5c31\u53ef\u4ee5\u8ba9\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u548c\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\u4ea4\u66ff\u6267\u884c\u3002\u6bcf\u6b21\uff0c\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u53ea\u6536\u96c6\u4e00\u5c0f\u7247\u533a\u57df\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u63a5\u7740\u5207\u6362\u5230\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\u3002\u4f9d\u6b21\u53cd\u590d\uff0c\u76f4\u5230\u5783\u573e\u6536\u96c6\u5b8c\u6210\u3002\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\uff0c\u7531\u4e8e\u5728\u5783\u573e\u56de\u6536\u8fc7\u7a0b\u4e2d\uff0c\u95f4\u65ad\u6027\u5730\u8fd8\u6267\u884c\u4e86\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\uff0c\u6240\u4ee5\u80fd\u51cf\u5c11\u7cfb\u7edf\u7684\u505c\u987f\u65f6\u95f4\u3002\u4f46\u662f\uff0c\u56e0\u4e3a\u7ebf\u7a0b\u5207\u6362\u548c\u4e0a\u4e0b\u6587\u8f6c\u6362\u7684\u6d88\u8017\uff0c\u4f1a\u4f7f\u5f97\u5783\u573e\u56de\u6536\u7684\u603b\u4f53\u6210\u672c\u4e0a\u5347\uff0c\u9020\u6210\u7cfb\u7edf\u541e\u5410\u91cf\u7684\u4e0b\u964d\u3002<\/p>\n
\u5783\u573e\u56de\u6536\u5668<\/p>\n
Serial\u6536\u96c6\u5668<\/p>\n
Serial\u6536\u96c6\u5668\u662f\u6700\u53e4\u8001\u7684\u6536\u96c6\u5668\uff0c\u5b83\u7684\u7f3a\u70b9\u662f\u5f53Serial\u6536\u96c6\u5668\u60f3\u8fdb\u884c\u5783\u573e\u56de\u6536\u7684\u65f6\u5019\uff0c\u5fc5\u987b\u6682\u505c\u7528\u6237\u7684\u6240\u6709\u8fdb\u7a0b\uff0c\u5373stop the world\u3002\u5230\u73b0\u5728\u4e3a\u6b62\uff0c\u5b83\u4f9d\u7136\u662f\u865a\u62df\u673a\u8fd0\u884c\u5728client\u6a21\u5f0f\u4e0b\u7684\u9ed8\u8ba4\u65b0\u751f\u4ee3\u6536\u96c6\u5668\uff0c\u4e0e\u5176\u4ed6\u6536\u96c6\u5668\u76f8\u6bd4\uff0c\u5bf9\u4e8e\u9650\u5b9a\u5728\u5355\u4e2aCPU\u7684\u8fd0\u884c\u73af\u5883\u6765\u8bf4\uff0cSerial\u6536\u96c6\u5668\u7531\u4e8e\u6ca1\u6709\u7ebf\u7a0b\u4ea4\u4e92\u7684\u5f00\u9500\uff0c\u4e13\u5fc3\u505a\u5783\u573e\u56de\u6536\u81ea\u7136\u53ef\u4ee5\u83b7\u5f97\u6700\u9ad8\u7684\u5355\u7ebf\u7a0b\u6536\u96c6\u6548\u7387\u3002<\/p>\n
\u00a0<\/p>\n
Serial Old\u662fSerial\u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u5b83\u540c\u6837\u662f\u4e00\u4e2a\u5355\u7ebf\u7a0b\u6536\u96c6\u5668\uff0c\u4f7f\u7528\u201d\u6807\u8bb0\uff0d\u6574\u7406\u201c\u7b97\u6cd5\u3002\u8fd9\u4e2a\u6536\u96c6\u5668\u7684\u4e3b\u8981\u610f\u4e49\u4e5f\u662f\u88abClient\u6a21\u5f0f\u4e0b\u7684\u865a\u62df\u673a\u4f7f\u7528\u3002\u5728Server\u6a21\u5f0f\u4e0b\uff0c\u5b83\u4e3b\u8981\u8fd8\u6709\u4e24\u5927\u7528\u9014\uff1a\u4e00\u4e2a\u662f\u5728JDK1.5\u53ca\u4ee5\u524d\u7684\u7248\u672c\u4e2d\u4e0eParallel Scanvenge\u6536\u96c6\u5668\u642d\u914d\u4f7f\u7528\uff0c\u53e6\u5916\u4e00\u4e2a\u5c31\u662f\u4f5c\u4e3aCMS\u6536\u96c6\u5668\u7684\u540e\u5907\u9884\u6848\uff0c\u5728\u5e76\u53d1\u6536\u96c6\u53d1\u751fConcurrent Mode Failure\u7684\u65f6\u5019\u4f7f\u7528\u3002<\/p>\n
\u901a\u8fc7\u6307\u5b9a-UseSerialGC\u53c2\u6570\uff0c\u4f7f\u7528Serial + Serial Old\u7684\u4e32\u884c\u6536\u96c6\u5668\u7ec4\u5408\u8fdb\u884c\u5185\u5b58\u56de\u6536\u3002<\/p>\n
ParNew\u6536\u96c6\u5668<\/p>\n
ParNew\u6536\u96c6\u5668\u662fSerial\u6536\u96c6\u5668\u65b0\u751f\u4ee3\u7684\u591a\u7ebf\u7a0b\u5b9e\u73b0\uff0c\u6ce8\u610f\u5728\u8fdb\u884c\u5783\u573e\u56de\u6536\u7684\u65f6\u5019\u4f9d\u7136\u4f1astop the world\uff0c\u53ea\u662f\u76f8\u6bd4\u8f83Serial\u6536\u96c6\u5668\u800c\u8a00\u5b83\u4f1a\u8fd0\u884c\u591a\u6761\u8fdb\u7a0b\u8fdb\u884c\u5783\u573e\u56de\u6536\u3002<\/p>\n
\u00a0<\/p>\n
ParNew\u6536\u96c6\u5668\u5728\u5355CPU\u7684\u73af\u5883\u4e2d\u7edd\u5bf9\u4e0d\u4f1a\u6709\u6bd4Serial\u6536\u96c6\u5668\u66f4\u597d\u7684\u6548\u679c\uff0c\u751a\u81f3\u7531\u4e8e\u5b58\u5728\u7ebf\u7a0b\u4ea4\u4e92\u7684\u5f00\u9500\uff0c\u8be5\u6536\u96c6\u5668\u5728\u901a\u8fc7\u8d85\u7ebf\u7a0b\u6280\u672f\u5b9e\u73b0\u7684\u4e24\u4e2aCPU\u7684\u73af\u5883\u4e2d\u90fd\u4e0d\u80fd\u767e\u5206\u4e4b\u767e\u7684\u4fdd\u8bc1\u80fd\u8d85\u8d8aSerial\u6536\u96c6\u5668\u3002\u5f53\u7136\uff0c\u968f\u7740\u53ef\u4ee5\u4f7f\u7528\u7684CPU\u7684\u6570\u91cf\u589e\u52a0\uff0c\u5b83\u5bf9\u4e8eGC\u65f6\u7cfb\u7edf\u8d44\u6e90\u7684\u5229\u7528\u8fd8\u662f\u5f88\u6709\u597d\u5904\u7684\u3002\u5b83\u9ed8\u8ba4\u5f00\u542f\u7684\u6536\u96c6\u7ebf\u7a0b\u6570\u4e0eCPU\u7684\u6570\u91cf\u76f8\u540c\uff0c\u5728CPU\u975e\u5e38\u591a\uff08\u8b6c\u598232\u4e2a\uff0c\u73b0\u5728CPU\u52a8\u8f844\u6838\u52a0\u8d85\u7ebf\u7a0b\uff0c\u670d\u52a1\u5668\u8d85\u8fc732\u4e2a\u903b\u8f91CPU\u7684\u60c5\u51b5\u8d8a\u6765\u8d8a\u591a\u4e86\uff09\u7684\u73af\u5883\u4e0b\uff0c\u53ef\u4ee5\u4f7f\u7528-XX:ParallelGCThreads\u53c2\u6570\u6765\u9650\u5236\u5783\u573e\u6536\u96c6\u7684\u7ebf\u7a0b\u6570\u3002<\/p>\n
-UseParNewGC: \u6253\u5f00\u6b64\u5f00\u5173\u540e\uff0c\u4f7f\u7528ParNew + Serial Old\u7684\u6536\u96c6\u5668\u7ec4\u5408\u8fdb\u884c\u5185\u5b58\u56de\u6536\uff0c\u8fd9\u6837\u65b0\u751f\u4ee3\u4f7f\u7528\u5e76\u884c\u6536\u96c6\u5668\uff0c\u8001\u5e74\u4ee3\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u5668\u3002<\/p>\n
\u00a0<\/p>\n
Parallel Scavenge\u6536\u96c6\u5668<\/p>\n
Parallel\u662f\u91c7\u7528\u590d\u5236\u7b97\u6cd5\u7684\u591a\u7ebf\u7a0b\u65b0\u751f\u4ee3\u5783\u573e\u56de\u6536\u5668\uff0c\u4f3c\u4e4e\u548cParNew\u6536\u96c6\u5668\u6709\u5f88\u591a\u7684\u76f8\u4f3c\u7684\u5730\u65b9\u3002\u4f46\u662fParallel Scanvenge\u6536\u96c6\u5668\u7684\u4e00\u4e2a\u7279\u70b9\u662f\u5b83\u6240\u5173\u6ce8\u7684\u76ee\u6807\u662f\u541e\u5410\u91cf(Throughput)\u3002\u6240\u8c13\u541e\u5410\u91cf\u5c31\u662fCPU\u7528\u4e8e\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u7684\u65f6\u95f4\u4e0eCPU\u603b\u6d88\u8017\u65f6\u95f4\u7684\u6bd4\u503c\uff0c\u5373\u541e\u5410\u91cf=\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u65f6\u95f4 \/ (\u8fd0\u884c\u7528\u6237\u4ee3\u7801\u65f6\u95f4 + \u5783\u573e\u6536\u96c6\u65f6\u95f4)\u3002\u505c\u987f\u65f6\u95f4\u8d8a\u77ed\u5c31\u8d8a\u9002\u5408\u9700\u8981\u4e0e\u7528\u6237\u4ea4\u4e92\u7684\u7a0b\u5e8f\uff0c\u826f\u597d\u7684\u54cd\u5e94\u901f\u5ea6\u80fd\u591f\u63d0\u5347\u7528\u6237\u7684\u4f53\u9a8c\uff1b\u800c\u9ad8\u541e\u5410\u91cf\u5219\u53ef\u4ee5\u6700\u9ad8\u6548\u7387\u5730\u5229\u7528CPU\u65f6\u95f4\uff0c\u5c3d\u5feb\u5730\u5b8c\u6210\u7a0b\u5e8f\u7684\u8fd0\u7b97\u4efb\u52a1\uff0c\u4e3b\u8981\u9002\u5408\u5728\u540e\u53f0\u8fd0\u7b97\u800c\u4e0d\u9700\u8981\u592a\u591a\u4ea4\u4e92\u7684\u4efb\u52a1\u3002<\/p>\n
Parallel Old\u6536\u96c6\u5668\u662fParallel Scavenge\u6536\u96c6\u5668\u7684\u8001\u5e74\u4ee3\u7248\u672c\uff0c\u91c7\u7528\u591a\u7ebf\u7a0b\u548c\u201d\u6807\u8bb0\uff0d\u6574\u7406\u201d\u7b97\u6cd5\u3002\u8fd9\u4e2a\u6536\u96c6\u5668\u662f\u5728jdk1.6\u4e2d\u624d\u5f00\u59cb\u63d0\u4f9b\u7684\uff0c\u5728\u6b64\u4e4b\u524d\uff0c\u65b0\u751f\u4ee3\u7684Parallel Scavenge\u6536\u96c6\u5668\u4e00\u76f4\u5904\u4e8e\u6bd4\u8f83\u5c34\u5c2c\u7684\u72b6\u6001\u3002\u539f\u56e0\u662f\u5982\u679c\u65b0\u751f\u4ee3Parallel Scavenge\u6536\u96c6\u5668\uff0c\u90a3\u4e48\u8001\u5e74\u4ee3\u9664\u4e86Serial Old(PS MarkSweep)\u6536\u96c6\u5668\u5916\u522b\u65e0\u9009\u62e9\u3002\u7531\u4e8e\u5355\u7ebf\u7a0b\u7684\u8001\u5e74\u4ee3Serial Old\u6536\u96c6\u5668\u5728\u670d\u52a1\u7aef\u5e94\u7528\u6027\u80fd\u4e0a\u7684\u201d\u62d6\u7d2f\u201c\uff0c\u5373\u4f7f\u4f7f\u7528\u4e86Parallel Scavenge\u6536\u96c6\u5668\u4e5f\u672a\u5fc5\u80fd\u5728\u6574\u4f53\u5e94\u7528\u4e0a\u83b7\u5f97\u541e\u5410\u91cf\u6700\u5927\u5316\u7684\u6548\u679c\uff0c\u53c8\u56e0\u4e3a\u8001\u5e74\u4ee3\u6536\u96c6\u4e2d\u65e0\u6cd5\u5145\u5206\u5229\u7528\u670d\u52a1\u5668\u591aCPU\u7684\u5904\u7406\u80fd\u529b\uff0c\u5728\u8001\u5e74\u4ee3\u5f88\u5927\u800c\u4e14\u786c\u4ef6\u6bd4\u8f83\u9ad8\u7ea7\u7684\u73af\u5883\u4e2d\uff0c\u8fd9\u79cd\u7ec4\u5408\u7684\u541e\u5410\u91cf\u751a\u81f3\u8fd8\u4e0d\u4e00\u5b9a\u6709ParNew\u52a0CMS\u7684\u7ec4\u5408\u201d\u7ed9\u529b\u201c\u3002\u76f4\u5230Parallel Old\u6536\u96c6\u5668\u51fa\u73b0\u540e\uff0c\u201d\u541e\u5410\u91cf\u4f18\u5148\u201c\u6536\u96c6\u5668\u7ec8\u4e8e\u6709\u4e86\u6bd4\u8f83\u540d\u526f\u5176\u5b9e\u7684\u5e94\u7528\u795d\u8d3a\uff0c\u5728\u6ce8\u91cd\u541e\u5410\u91cf\u53caCPU\u8d44\u6e90\u654f\u611f\u7684\u573a\u5408\uff0c\u90fd\u53ef\u4ee5\u4f18\u5148\u8003\u8651Parallel Scavenge\u52a0Parallel Old\u6536\u96c6\u5668\u3002<\/p>\n
-UseParallelGC: \u865a\u62df\u673a\u8fd0\u884c\u5728Server\u6a21\u5f0f\u4e0b\u7684\u9ed8\u8ba4\u503c\uff0c\u6253\u5f00\u6b64\u5f00\u5173\u540e\uff0c\u4f7f\u7528Parallel Scavenge + Serial Old\u7684\u6536\u96c6\u5668\u7ec4\u5408\u8fdb\u884c\u5185\u5b58\u56de\u6536\u3002-UseParallelOldGC: \u6253\u5f00\u6b64\u5f00\u5173\u540e\uff0c\u4f7f\u7528Parallel Scavenge + Parallel Old\u7684\u6536\u96c6\u5668\u7ec4\u5408\u8fdb\u884c\u5783\u573e\u56de\u6536<\/p>\n
CMS\u6536\u96c6\u5668<\/p>\n
CMS(Concurrent Mark Swep)\u6536\u96c6\u5668\u662f\u4e00\u4e2a\u6bd4\u8f83\u91cd\u8981\u7684\u56de\u6536\u5668\uff0c\u73b0\u5728\u5e94\u7528\u975e\u5e38\u5e7f\u6cdb\uff0c\u6211\u4eec\u91cd\u70b9\u6765\u770b\u4e00\u4e0b\uff0cCMS\u4e00\u79cd\u83b7\u53d6\u6700\u77ed\u56de\u6536\u505c\u987f\u65f6\u95f4\u4e3a\u76ee\u6807\u7684\u6536\u96c6\u5668\uff0c\u8fd9\u4f7f\u5f97\u5b83\u5f88\u9002\u5408\u7528\u4e8e\u548c\u7528\u6237\u4ea4\u4e92\u7684\u4e1a\u52a1\u3002\u4ece\u540d\u5b57(Mark Swep)\u5c31\u53ef\u4ee5\u770b\u51fa\uff0cCMS\u6536\u96c6\u5668\u662f\u57fa\u4e8e\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5\u5b9e\u73b0\u7684\u3002\u5b83\u7684\u6536\u96c6\u8fc7\u7a0b\u5206\u4e3a\u56db\u4e2a\u6b65\u9aa4\uff1a<\/p>\n
\u521d\u59cb\u6807\u8bb0(initial mark)<\/p>\n
\u5e76\u53d1\u6807\u8bb0(concurrent mark)<\/p>\n
\u91cd\u65b0\u6807\u8bb0(remark)<\/p>\n
\u5e76\u53d1\u6e05\u9664(concurrent sweep)<\/p>\n
\u6ce8\u610f\u521d\u59cb\u6807\u8bb0\u548c\u91cd\u65b0\u6807\u8bb0\u8fd8\u662f\u4f1astop the world\uff0c\u4f46\u662f\u5728\u8017\u8d39\u65f6\u95f4\u66f4\u957f\u7684\u5e76\u53d1\u6807\u8bb0\u548c\u5e76\u53d1\u6e05\u9664\u4e24\u4e2a\u9636\u6bb5\u90fd\u53ef\u4ee5\u548c\u7528\u6237\u8fdb\u7a0b\u540c\u65f6\u5de5\u4f5c\u3002<\/p>\n
\u00a0<\/p>\n
G1\u6536\u96c6\u5668<\/p>\n
G1\u6536\u96c6\u5668\u662f\u4e00\u6b3e\u9762\u5411\u670d\u52a1\u7aef\u5e94\u7528\u7684\u5783\u573e\u6536\u96c6\u5668\u3002HotSpot\u56e2\u961f\u8d4b\u4e88\u5b83\u7684\u4f7f\u547d\u662f\u5728\u672a\u6765\u66ff\u6362\u6389JDK1.5\u4e2d\u53d1\u5e03\u7684CMS\u6536\u96c6\u5668\u3002\u4e0e\u5176\u4ed6GC\u6536\u96c6\u5668\u76f8\u6bd4\uff0cG1\u5177\u5907\u5982\u4e0b\u7279\u70b9\uff1a<\/p>\n
\u5e76\u884c\u4e0e\u5e76\u53d1\uff1aG1\u80fd\u66f4\u5145\u5206\u7684\u5229\u7528CPU\uff0c\u591a\u6838\u73af\u5883\u4e0b\u7684\u786c\u4ef6\u4f18\u52bf\u6765\u7f29\u77edstop the world\u7684\u505c\u987f\u65f6\u95f4\u3002<\/p>\n
\u5206\u4ee3\u6536\u96c6\uff1a\u548c\u5176\u4ed6\u6536\u96c6\u5668\u4e00\u6837\uff0c\u5206\u4ee3\u7684\u6982\u5ff5\u5728G1\u4e2d\u4f9d\u7136\u5b58\u5728\uff0c\u4e0d\u8fc7G1\u4e0d\u9700\u8981\u5176\u4ed6\u7684\u5783\u573e\u56de\u6536\u5668\u7684\u914d\u5408\u5c31\u53ef\u4ee5\u72ec\u81ea\u7ba1\u7406\u6574\u4e2aGC\u5806\u3002<\/p>\n
\u7a7a\u95f4\u6574\u5408\uff1aG1\u6536\u96c6\u5668\u6709\u5229\u4e8e\u7a0b\u5e8f\u957f\u65f6\u95f4\u8fd0\u884c\uff0c\u5206\u914d\u5927\u5bf9\u8c61\u65f6\u4e0d\u4f1a\u65e0\u6cd5\u5f97\u5230\u8fde\u7eed\u7684\u7a7a\u95f4\u800c\u63d0\u524d\u89e6\u53d1\u4e00\u6b21GC\u3002<\/p>\n
\u53ef\u9884\u6d4b\u7684\u975e\u505c\u987f\uff1a\u8fd9\u662fG1\u76f8\u5bf9\u4e8eCMS\u7684\u53e6\u4e00\u5927\u4f18\u52bf\uff0c\u964d\u4f4e\u505c\u987f\u65f6\u95f4\u662fG1\u548cCMS\u5171\u540c\u7684\u5173\u6ce8\u70b9\uff0c\u80fd\u8ba9\u4f7f\u7528\u8005\u660e\u786e\u6307\u5b9a\u5728\u4e00\u4e2a\u957f\u5ea6\u4e3aM\u6beb\u79d2\u7684\u65f6\u95f4\u7247\u6bb5\u5185\uff0c\u6d88\u8017\u5728\u5783\u573e\u6536\u96c6\u4e0a\u7684\u65f6\u95f4\u4e0d\u5f97\u8d85\u8fc7N\u6beb\u79d2\u3002<\/p>\n
CMS\uff1a\u91c7\u7528\u6807\u8bb0\u6e05\u9664\u7b97\u6cd5<\/p>\n
\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u529e\u6cd5\u5c31\u662f\u53ef\u4ee5\u8ba9CMS\u5728\u8fdb\u884c\u4e00\u5b9a\u6b21\u6570\u7684Full GC\uff08\u6807\u8bb0\u6e05\u9664\uff09\u7684\u65f6\u5019\u8fdb\u884c\u4e00\u6b21\u6807\u8bb0\u6574\u7406\u7b97\u6cd5\uff0cCMS\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u53c2\u6570\u6765\u63a7\u5236\uff1a<\/p>\n
-XX:UseCMSCompactAtFullCollection -XX:CMSFullGCBeforeCompaction=5<\/p>\n
\u4e5f\u5c31\u662fCMS\u5728\u8fdb\u884c5\u6b21Full GC\uff08\u6807\u8bb0\u6e05\u9664\uff09\u4e4b\u540e\u8fdb\u884c\u4e00\u6b21\u6807\u8bb0\u6574\u7406\u7b97\u6cd5\uff0c\u4ece\u800c\u53ef\u4ee5\u63a7\u5236\u8001\u5e74\u5e26\u7684\u788e\u7247\u5728\u4e00\u5b9a\u7684\u6570\u91cf\u4ee5\u5185\uff0c\u751a\u81f3\u53ef\u4ee5\u914d\u7f6eCMS\u5728\u6bcf\u6b21Full GC\u7684\u65f6\u5019\u90fd\u8fdb\u884c\u5185\u5b58\u7684\u6574\u7406\u3002<\/p>\n
\u00a0<\/p>\n
\u00a0<\/p>\n
“`<\/p>\n","protected":false},"excerpt":{"rendered":"
“`\u8003\u5bdf\u70b9\uff1aJVM \u5783\u573e\u56de\u6536\u7b97\u6cd5 \u6807\u8bb0\u6e05\u9664 \u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5c06\u5783\u573e\u56de\u6536\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a\u6807\u8bb0\u9636\u6bb5\u548c\u6e05\u9664\u9636 […]<\/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-39143","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/39143","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=39143"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/39143\/revisions"}],"predecessor-version":[{"id":39144,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/39143\/revisions\/39144"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=39143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=39143"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=39143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}