{"id":3749,"date":"2024-01-10T14:30:48","date_gmt":"2024-01-10T06:30:48","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/index.php\/jvm\/jvm-21-%e7%9a%84%e8%b0%83%e4%bc%98%e6%8c%87%e5%8d%97%ef%bc%9a%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8cjvm%e8%b0%83%e4%bc%98%ef%bc%8cjvm%e8%b0%83%e4%bc%98%e5%8f%82%e6%95%b0\/"},"modified":"2024-01-10T14:30:48","modified_gmt":"2024-01-10T06:30:48","slug":"jvm-21-%e7%9a%84%e8%b0%83%e4%bc%98%e6%8c%87%e5%8d%97%ef%bc%9a%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8cjvm%e8%b0%83%e4%bc%98%ef%bc%8cjvm%e8%b0%83%e4%bc%98%e5%8f%82%e6%95%b0","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/jvm\/jvm-21-%e7%9a%84%e8%b0%83%e4%bc%98%e6%8c%87%e5%8d%97%ef%bc%9a%e5%a6%82%e4%bd%95%e8%bf%9b%e8%a1%8cjvm%e8%b0%83%e4%bc%98%ef%bc%8cjvm%e8%b0%83%e4%bc%98%e5%8f%82%e6%95%b0\/","title":{"rendered":"\u200bJVM 21 \u7684\u8c03\u4f18\u6307\u5357\uff1a\u5982\u4f55\u8fdb\u884cJVM\u8c03\u4f18\uff0cJVM\u8c03\u4f18\u53c2\u6570"},"content":{"rendered":"
\n
\n

\u804a\u804a\u5173\u4e8eJVM 21\u7684\u4f18\u5316\u6307\u5357\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c06\u4f1a\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u8fdb\u884cJVM\u8c03\u4f18\uff0c\u4ecb\u7ecd\u4e00\u4e9b\u5173\u952e\u7684JVM\u8c03\u4f18\u53c2\u6570\uff0c\u5e76\u63d0\u4f9b12\u4e2a\u5b9e\u7528\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u7531\u4e8e\u7bc7\u5e45\u8f83\u957f\uff0c\u6211\u4f1a\u5206\u51e0\u4e2a\u90e8\u5206\u6765\u8be6\u7ec6\u8bb2\u89e3\u3002<\/p>\n

<\/span>JVM\u8c03\u4f18\u6982\u89c8<\/h2>\n

JVM\uff08Java\u865a\u62df\u673a\uff09\u8c03\u4f18\u662f\u4e00\u4e2a\u590d\u6742\u4f46\u91cd\u8981\u7684\u4efb\u52a1\uff0c\u7279\u522b\u662f\u5728\u5904\u7406\u5927\u578b\u3001\u590d\u6742\u7684\u5e94\u7528\u7a0b\u5e8f\u65f6\u3002JVM\u8c03\u4f18\u7684\u76ee\u7684\u662f\u4f18\u5316JVM\u7684\u6027\u80fd\uff0c\u4ee5\u63d0\u9ad8\u5e94\u7528\u7a0b\u5e8f\u7684\u54cd\u5e94\u901f\u5ea6\u548c\u5904\u7406\u80fd\u529b\u3002JVM 21\u5f15\u5165\u4e86\u4e00\u4e9b\u65b0\u7684\u4f18\u5316\u7279\u6027\u548c\u53c2\u6570\uff0c\u4f7f\u5f97\u8c03\u4f18\u5de5\u4f5c\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n

\u672c\u6587\u5df2\u6536\u5f55\u4e8e\uff0c\u6211\u7684\u6280\u672f\u7f51\u7ad9 ddkk.com\uff0c\u6709\u5927\u5382\u5b8c\u6574\u9762\u7ecf\uff0c\u5de5\u4f5c\u6280\u672f\uff0c\u67b6\u6784\u5e08\u6210\u957f\u4e4b\u8def\uff0c\u7b49\u7ecf\u9a8c\u5206\u4eab<\/p>\n

<\/span>JVM\u8c03\u4f18\u53c2\u6570<\/h2>\n

JVM\u8c03\u4f18\u901a\u5e38\u6d89\u53ca\u5230\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\u7684\u53c2\u6570\uff1a<\/p>\n

<\/span>1\u3001\u5185\u5b58\u7ba1\u7406\u53c2\u6570\uff1a<\/span><\/h3>\n

-Xms<\/strong> \u548c -Xmx<\/strong>\uff1a\u8bbe\u7f6e\u5806\u7684\u521d\u59cb\u5927\u5c0f\u548c\u6700\u5927\u5927\u5c0f\u3002<\/p>\n

-XX:NewSize<\/strong> \u548c -XX:MaxNewSize<\/strong>\uff1a\u8bbe\u7f6e\u65b0\u751f\u4ee3\u7684\u521d\u59cb\u5927\u5c0f\u548c\u6700\u5927\u5927\u5c0f\u3002<\/p>\n

-XX:PermSize<\/strong> \u548c -XX:MaxPermSize<\/strong>\uff1a\u8bbe\u7f6e\u6c38\u4e45\u4ee3\uff08\u5728JDK 8\u4e4b\u540e\u88ab\u5143\u7a7a\u95f4Metaspace\u66ff\u4ee3\uff09\u7684\u5927\u5c0f\u3002<\/p>\n

<\/span>2\u3001\u5783\u573e\u6536\u96c6\u5668\u53c2\u6570\uff1a<\/span><\/h3>\n

-XX:+UseG1GC<\/strong>\uff1a\u542f\u7528G1\u5783\u573e\u6536\u96c6\u5668\u3002<\/p>\n

-XX:GCTimeRatio<\/strong>\uff1a\u8bbe\u7f6e\u541e\u5410\u91cf\u5927\u5c0f\u3002<\/p>\n

-XX:MaxGCPauseMillis<\/strong>\uff1a\u8bbe\u7f6e\u6700\u5927\u5783\u573e\u6536\u96c6\u505c\u987f\u65f6\u95f4\u3002<\/p>\n

<\/span>3\u3001\u6027\u80fd\u76d1\u63a7\u53c2\u6570\uff1a<\/span><\/h3>\n

-XX:+PrintGCDetails<\/strong>\uff1a\u6253\u5370\u5783\u573e\u56de\u6536\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n

-XX:+UseGCLogFileRotation<\/strong>\uff1a\u542f\u7528GC\u65e5\u5fd7\u6587\u4ef6\u7684\u81ea\u52a8\u65cb\u8f6c\u3002<\/p>\n

<\/span>12\u4e2a\u5b9e\u6218\u6848\u4f8b<\/h2>\n

\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u51e0\u4e2a\u5b9e\u7528\u7684\u4ee3\u7801\u793a\u4f8b\uff0c\u8fd9\u4e9b\u793a\u4f8b\u5c06\u5e2e\u52a9\u4f60\u66f4\u597d\u5730\u7406\u89e3JVM\u8c03\u4f18\u7684\u5b9e\u8df5\u64cd\u4f5c\u3002<\/p>\n

<\/span>\u793a\u4f8b1\uff1a\u57fa\u672c\u7684JVM\u5185\u5b58\u8bbe\u7f6e<\/h2>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u8bbe\u7f6eJVM\u7684\u521d\u59cb\u5806\u5927\u5c0f\u548c\u6700\u5927\u5806\u5927\u5c0f<\/span>public<\/span>class<\/span>JvmMemoryExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u8fd9\u91cc\u7684\u4ee3\u7801\u4e3b\u8981\u7528\u4e8e\u5c55\u793a\uff0c\u5b9e\u9645JVM\u7684\u53c2\u6570\u8bbe\u7f6e\u662f\u5728\u542f\u52a8JVM\u65f6\u901a\u8fc7\u547d\u4ee4\u884c\u5b8c\u6210\u7684<\/span>System.out.println(\"JVMMemoryExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-Xms512m-Xmx1024mJvmMemoryExample<\/code><\/pre>\n
\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u8bbe\u7f6e\u4e86JVM\u7684\u521d\u59cb\u5806\u5927\u5c0f\u4e3a512MB\uff0c\u6700\u5927\u5806\u5927\u5c0f\u4e3a1024MB\u3002<\/p>\n
<\/span>\u793a\u4f8b2\uff1a\u4f7f\u7528G1\u5783\u573e\u6536\u96c6\u5668<\/h2>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u4f7f\u7528G1\u5783\u573e\u6536\u96c6\u5668<\/span>public<\/span>class<\/span>G1GCExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/G1\u5783\u573e\u6536\u96c6\u5668\u7684\u4f7f\u7528\u4e3b\u8981\u662f\u901a\u8fc7JVM\u542f\u52a8\u53c2\u6570\u6765\u8bbe\u7f6e<\/span>System.out.println(\"G1GarbageCollectorExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+UseG1GCG1GCExample<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c\u6211\u4eec\u901a\u8fc7JVM\u53c2\u6570\u542f\u7528\u4e86G1\u5783\u573e\u6536\u96c6\u5668\u3002<\/p>\n
<\/span>\u793a\u4f8b3\uff1a\u6253\u5370GC\u8be6\u7ec6\u4fe1\u606f<\/h2>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u6253\u5370GC\u7684\u8be6\u7ec6\u4fe1\u606f<\/span>public<\/span>class<\/span>GCDetailsExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u6253\u5370GC\u8be6\u7ec6\u4fe1\u606f\u662f\u901a\u8fc7JVM\u53c2\u6570\u6765\u5b9e\u73b0\u7684<\/span>System.out.println(\"GCDetailsExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+PrintGCDetailsGCDetailsExample<\/code><\/pre>\n
\u8fd9\u91cc\uff0c\u6211\u4eec\u901a\u8fc7JVM\u53c2\u6570\u6765\u6253\u5370\u5783\u573e\u56de\u6536\u7684\u8be6\u7ec6\u4fe1\u606f\u3002<\/p>\n
<\/span>\u793a\u4f8b4\uff1a\u8bbe\u7f6e\u6700\u5927\u505c\u987f\u65f6\u95f4\u76ee\u6807<\/h2>\n
\u8fd9\u4e2a\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u8bbe\u7f6e\u5783\u573e\u56de\u6536\u7684\u6700\u5927\u505c\u987f\u65f6\u95f4\u76ee\u6807\uff0c\u4ee5\u51cf\u5c11\u5783\u573e\u56de\u6536\u5bf9\u5e94\u7528\u6027\u80fd\u7684\u5f71\u54cd\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u8bbe\u7f6e\u6700\u5927\u505c\u987f\u65f6\u95f4\u76ee\u6807<\/span>public<\/span>class<\/span>MaxGCPauseMillisExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u8bbe\u7f6e\u6700\u5927\u505c\u987f\u65f6\u95f4\u662f\u901a\u8fc7JVM\u542f\u52a8\u53c2\u6570\u5b9e\u73b0\u7684\uff0c\u4ee3\u7801\u672c\u8eab\u4e0d\u6d89\u53ca<\/span>System.out.println(\"MaxGCPauseMillisExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:MaxGCPauseMillis=200<\/span>MaxGCPauseMillisExample<\/code><\/pre>\n
\u8fd9\u4e2a\u53c2\u6570\u8bbe\u7f6e\u4e86\u5783\u573e\u56de\u6536\u7684\u6700\u5927\u505c\u987f\u65f6\u95f4\u4e3a200\u6beb\u79d2\u3002<\/p>\n
<\/span>\u793a\u4f8b5\uff1a\u4f7f\u7528\u5e76\u884c\u5783\u573e\u6536\u96c6\u5668<\/h2>\n
\u8fd9\u4e2a\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u542f\u7528\u5e76\u884c\u5783\u573e\u6536\u96c6\u5668\uff0c\u8fd9\u6709\u52a9\u4e8e\u5728\u591a\u6838\u5904\u7406\u5668\u4e0a\u63d0\u9ad8\u5783\u573e\u56de\u6536\u7684\u6548\u7387\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u4f7f\u7528\u5e76\u884c\u5783\u573e\u6536\u96c6\u5668<\/span>public<\/span>class<\/span>ParallelGCExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u542f\u7528\u5e76\u884c\u5783\u573e\u6536\u96c6\u5668\u662f\u901a\u8fc7JVM\u542f\u52a8\u53c2\u6570\u6765\u8bbe\u7f6e\u7684<\/span>System.out.println(\"ParallelGarbageCollectorExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+UseParallelGCParallelGCExample<\/code><\/pre>\n
\u8fd9\u4e2a\u53c2\u6570\u542f\u7528\u4e86\u5e76\u884c\u5783\u573e\u6536\u96c6\u5668\uff0c\u5229\u7528\u591a\u6838\u5904\u7406\u5668\u6765\u63d0\u9ad8\u5783\u573e\u56de\u6536\u6548\u7387\u3002<\/p>\n
<\/span>\u793a\u4f8b6\uff1a\u5f00\u542fGC\u65e5\u5fd7\u548c\u65e5\u5fd7\u6587\u4ef6\u8f6e\u6362<\/h2>\n
\u8fd9\u4e2a\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u5f00\u542fGC\u65e5\u5fd7\u8bb0\u5f55\uff0c\u5e76\u4e14\u542f\u7528\u65e5\u5fd7\u6587\u4ef6\u8f6e\u6362\u529f\u80fd\uff0c\u4ee5\u4fbf\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5206\u6790GC\u65e5\u5fd7\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u5f00\u542fGC\u65e5\u5fd7\u548c\u65e5\u5fd7\u6587\u4ef6\u8f6e\u6362<\/span>public<\/span>class<\/span>GCLogExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u5f00\u542fGC\u65e5\u5fd7\u548c\u65e5\u5fd7\u6587\u4ef6\u8f6e\u6362\u662f\u901a\u8fc7JVM\u53c2\u6570\u5b9e\u73b0\u7684<\/span>System.out.println(\"GCLogandLogRotationExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+PrintGC-XX:+UseGCLogFileRotation-XX:NumberOfGCLogFiles=5<\/span>-XX:GCLogFileSize=10<\/span>MGCLogExample<\/code><\/pre>\n
\u8fd9\u4e9b\u53c2\u6570\u7ec4\u5408\u5b9e\u73b0\u4e86\u5f00\u542fGC\u65e5\u5fd7\u8bb0\u5f55\uff0c\u5e76\u8bbe\u7f6e\u4e86\u65e5\u5fd7\u6587\u4ef6\u8f6e\u6362\uff0c\u4fdd\u6301\u6700\u591a5\u4e2aGC\u65e5\u5fd7\u6587\u4ef6\uff0c\u6bcf\u4e2a\u6587\u4ef6\u5927\u5c0f\u4e0d\u8d85\u8fc710MB\u3002<\/p>\n
<\/span>\u793a\u4f8b7\uff1a\u5f00\u542f\u7ebf\u7a0b\u672c\u5730\u5206\u914d\u7f13\u51b2\uff08TLAB\uff09<\/h2>\n
\u8fd9\u4e2a\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u5f00\u542f\u7ebf\u7a0b\u672c\u5730\u5206\u914d\u7f13\u51b2\uff08TLAB\uff09\uff0c\u8fd9\u662f\u4e00\u79cd\u4f18\u5316\u6280\u672f\uff0c\u53ef\u4ee5\u51cf\u5c11\u7ebf\u7a0b\u95f4\u7684\u7ade\u4e89\uff0c\u63d0\u9ad8\u5bf9\u8c61\u5206\u914d\u7684\u6548\u7387\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u5f00\u542f\u7ebf\u7a0b\u672c\u5730\u5206\u914d\u7f13\u51b2\uff08TLAB\uff09<\/span>public<\/span>class<\/span>TLABExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u5f00\u542fTLAB\u662f\u901a\u8fc7JVM\u53c2\u6570\u5b9e\u73b0\u7684<\/span>System.out.println(\"ThreadLocalAllocationBuffer(TLAB)Example\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+UseTLABTLABExample<\/code><\/pre>\n
\u901a\u8fc7\u8fd9\u4e2a\u53c2\u6570\uff0cJVM\u4f1a\u4e3a\u6bcf\u4e2a\u7ebf\u7a0b\u5206\u914d\u4e00\u4e2a\u672c\u5730\u7f13\u51b2\u533a\uff0c\u7528\u4e8e\u5bf9\u8c61\u5206\u914d\uff0c\u4ece\u800c\u51cf\u5c11\u7ebf\u7a0b\u95f4\u7684\u7ade\u4e89\u3002<\/p>\n
<\/span>\u793a\u4f8b8\uff1a\u8bbe\u7f6e\u5143\u7a7a\u95f4\u5927\u5c0f<\/h2>\n
\u5143\u7a7a\u95f4\uff08Metaspace\uff09\u662f\u5b58\u653e\u7c7b\u5143\u6570\u636e\u7684\u533a\u57df\u3002\u8fd9\u4e2a\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u8bbe\u7f6e\u5143\u7a7a\u95f4\u7684\u5927\u5c0f\uff0c\u907f\u514d\u56e0\u5143\u7a7a\u95f4\u4e0d\u8db3\u800c\u5bfc\u81f4\u7684\u95ee\u9898\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u8bbe\u7f6e\u5143\u7a7a\u95f4\u5927\u5c0f<\/span>public<\/span>class<\/span>MetaspaceSizeExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u8bbe\u7f6e\u5143\u7a7a\u95f4\u5927\u5c0f\u662f\u901a\u8fc7JVM\u53c2\u6570\u6765\u5b9e\u73b0\u7684<\/span>System.out.println(\"MetaspaceSizeExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:MetaspaceSize=128<\/span>m-XX:MaxMetaspaceSize=256<\/span>mMetaspaceSizeExample<\/code><\/pre>\n
\u8fd9\u91cc\u6211\u4eec\u8bbe\u7f6e\u4e86\u5143\u7a7a\u95f4\u7684\u521d\u59cb\u5927\u5c0f\u4e3a128MB\uff0c\u6700\u5927\u5927\u5c0f\u4e3a256MB\u3002<\/p>\n
<\/span>\u793a\u4f8b9\uff1a\u5f00\u542f\u7c7b\u6570\u636e\u5171\u4eab\uff08CDS\uff09<\/h2>\n
\u7c7b\u6570\u636e\u5171\u4eab\uff08CDS\uff09\u53ef\u4ee5\u52a0\u5febJVM\u7684\u542f\u52a8\u901f\u5ea6\uff0c\u5e76\u51cf\u5c11\u8fd0\u884c\u65f6\u5185\u5b58\u7684\u5360\u7528\u3002\u8fd9\u4e2a\u793a\u4f8b\u6f14\u793a\u4e86\u5982\u4f55\u5f00\u542fCDS\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u5f00\u542f\u7c7b\u6570\u636e\u5171\u4eab\uff08CDS\uff09<\/span>public<\/span>class<\/span>CDSExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u5f00\u542fCDS\u662f\u901a\u8fc7JVM\u53c2\u6570\u5b9e\u73b0\u7684<\/span>System.out.println(\"ClassDataSharing(CDS)Example\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+UseCDSCDSExample<\/code><\/pre>\n
\u901a\u8fc7\u8fd9\u4e2a\u53c2\u6570\uff0cJVM\u4f1a\u5c1d\u8bd5\u5171\u4eab\u5e38\u7528\u7c7b\u7684\u6570\u636e\uff0c\u4ee5\u6b64\u6765\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
<\/span>\u793a\u4f8b10\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u7684\u6bd4\u4f8b<\/h2>\n
\u5728JVM\u4e2d\uff0c\u5806\u5185\u5b58\u88ab\u5206\u4e3a\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u3002\u5408\u7406\u8bbe\u7f6e\u8fd9\u4e24\u8005\u7684\u6bd4\u4f8b\u53ef\u4ee5\u4f18\u5316\u5783\u573e\u6536\u96c6\u7684\u6027\u80fd\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u7684\u6bd4\u4f8b<\/span>public<\/span>class<\/span>YoungOldGenerationRatioExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u548c\u8001\u5e74\u4ee3\u7684\u6bd4\u4f8b\u662f\u901a\u8fc7JVM\u53c2\u6570\u6765\u5b9e\u73b0\u7684<\/span>System.out.println(\"Young\/OldGenerationRatioExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:NewRatio=2<\/span>YoungOldGenerationRatioExample<\/code><\/pre>\n
\u8fd9\u4e2a\u53c2\u6570\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\uff08New Generation\uff09\u4e0e\u8001\u5e74\u4ee3\uff08Old Generation\uff09\u7684\u5927\u5c0f\u6bd4\u4f8b\u4e3a1:2\u3002<\/p>\n
<\/span>\u793a\u4f8b11\uff1a\u5f00\u542f\u5b57\u7b26\u4e32\u53bb\u91cd<\/h2>\n
\u5b57\u7b26\u4e32\u53bb\u91cd\u662fJVM\u5728Java 8u20\u53ca\u4ee5\u540e\u7248\u672c\u5f15\u5165\u7684\u4e00\u4e2a\u7279\u6027\uff0c\u53ef\u4ee5\u51cf\u5c11\u91cd\u590d\u5b57\u7b26\u4e32\u7684\u5185\u5b58\u5360\u7528\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u5f00\u542f\u5b57\u7b26\u4e32\u53bb\u91cd<\/span>public<\/span>class<\/span>StringDeduplicationExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u5f00\u542f\u5b57\u7b26\u4e32\u53bb\u91cd\u662f\u901a\u8fc7JVM\u53c2\u6570\u6765\u5b9e\u73b0\u7684<\/span>System.out.println(\"StringDeduplicationExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:+UseStringDeduplicationStringDeduplicationExample<\/code><\/pre>\n
\u8fd9\u4e2a\u53c2\u6570\u542f\u7528\u4e86\u5b57\u7b26\u4e32\u53bb\u91cd\u529f\u80fd\uff0c\u5e2e\u52a9\u8282\u7701\u5185\u5b58\u7a7a\u95f4\u3002<\/p>\n
<\/span>\u793a\u4f8b12\uff1a\u8bbe\u7f6e\u4ee3\u7801\u7f13\u5b58\u5927\u5c0f<\/h2>\n
\u4ee3\u7801\u7f13\u5b58\u662fJVM\u4e2d\u5b58\u50a8\u5df2\u7f16\u8bd1\u65b9\u6cd5\u7684\u5730\u65b9\u3002\u8c03\u6574\u4ee3\u7801\u7f13\u5b58\u7684\u5927\u5c0f\u53ef\u4ee5\u5f71\u54cd\u7f16\u8bd1\u65b9\u6cd5\u7684\u6570\u91cf\u548c\u6027\u80fd\u3002<\/p>\n
\/\/\u793a\u4f8b\u4ee3\u7801\uff1a\u8bbe\u7f6e\u4ee3\u7801\u7f13\u5b58\u5927\u5c0f<\/span>public<\/span>class<\/span>CodeCacheSizeExample<\/span><\/span>{public<\/span>static<\/span>void<\/span>main<\/span>(String[]args)<\/span><\/span>{\/\/\u8bbe\u7f6e\u4ee3\u7801\u7f13\u5b58\u5927\u5c0f\u662f\u901a\u8fc7JVM\u53c2\u6570\u6765\u5b9e\u73b0\u7684<\/span>System.out.println(\"CodeCacheSizeExample\"<\/span>);}}<\/code><\/pre>\n
\u542f\u52a8\u53c2\u6570\uff1a<\/p>\n
java-XX:InitialCodeCacheSize=32<\/span>m-XX:ReservedCodeCacheSize=64<\/span>mCodeCacheSizeExample<\/code><\/pre>\n
\u8fd9\u4e9b\u53c2\u6570\u8bbe\u7f6e\u4e86\u4ee3\u7801\u7f13\u5b58\u7684\u521d\u59cb\u5927\u5c0f\u4e3a32MB\uff0c\u6700\u5927\u4fdd\u7559\u5927\u5c0f\u4e3a64MB\u3002<\/p>\n
<\/span>\u7ed3\u8bed<\/h2>\n
\u4ee5\u4e0a\u793a\u4f8b\u5c55\u73b0\u4e86JVM\u8c03\u4f18\u7684\u4e0d\u540c\u65b9\u9762\uff0c\u5305\u62ec\u5185\u5b58\u7ba1\u7406\u3001\u6027\u80fd\u4f18\u5316\u548c\u8d44\u6e90\u5229\u7528\u7387\u7684\u63d0\u5347\u3002\u6bcf\u4e2a\u5e94\u7528\u7684\u5177\u4f53\u60c5\u51b5\u90fd\u4e0d\u5c3d\u76f8\u540c\uff0c\u56e0\u6b64\u5728\u8fdb\u884cJVM\u8c03\u4f18\u65f6\uff0c\u9700\u8981\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8fdb\u884c\u7ec6\u81f4\u7684\u8c03\u6574\u548c\u6d4b\u8bd5\u3002\u5e0c\u671b\u8fd9\u4e9b\u793a\u4f8b\u80fd\u591f\u4e3a\u4f60\u638c\u63e1JVM\u8c03\u4f18\u63d0\u4f9b\u5b9e\u7528\u7684\u53c2\u8003\u3002\u8bb0\u4f4f\uff0c\u6709\u6548\u7684JVM\u8c03\u4f18\u7b56\u7565\u662f\u57fa\u4e8e\u5bf9\u5e94\u7528\u6027\u80fd\u548c\u8d44\u6e90\u4f7f\u7528\u7684\u6df1\u5165\u4e86\u89e3\u3002\u6301\u7eed\u76d1\u63a7\u548c\u9002\u65f6\u8c03\u6574\uff0c\u624d\u80fd\u786e\u4fdd\u5e94\u7528\u7684\u6700\u4f73\u6027\u80fd\u3002<\/p>\n
\u672c\u6587\u5df2\u6536\u5f55\u4e8e\uff0c\u6211\u7684\u6280\u672f\u7f51\u7ad9 ddkk.com\uff0c\u6709\u5927\u5382\u5b8c\u6574\u9762\u7ecf\uff0c\u5de5\u4f5c\u6280\u672f\uff0c\u67b6\u6784\u5e08\u6210\u957f\u4e4b\u8def\uff0c\u7b49\u7ecf\u9a8c\u5206\u4eab<\/p>\n<\/section>\n
<\/mp-style-type><\/p>\n
\n
\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7:                 \u7a0b\u5e8f\u5458\u9e4f\u78ca              <\/p>\n<\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"
\u804a\u804a\u5173\u4e8eJVM 21\u7684\u4f18\u5316\u6307\u5357\u3002\u8fd9\u7bc7\u6587\u7ae0\u5c06\u4f1a\u6df1\u5165\u63a2\u8ba8\u5982\u4f55\u8fdb\u884cJVM\u8c03\u4f18\uff0c\u4ecb\u7ecd\u4e00\u4e9b\u5173\u952e\u7684JVM\u8c03\u4f18\u53c2\u6570\uff0c\u5e76\u63d0\u4f9b12\u4e2a\u5b9e\u7528\u7684\u4ee3\u7801\u793a\u4f8b\u3002 …<\/p>\n","protected":false},"author":1,"featured_media":3747,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[27],"tags":[],"class_list":["post-3749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-jvm"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279-150x150.png","content_first_image":null,"post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279-300x167.png","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279-1024x569.png","post_frist_image":null,"post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279-300x167.png","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279-1024x569.png","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/01\/20240110143416279.png","post_all_images":[],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"JVM","post_date":"2024-01-10","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":403,"next_post_id":5252,"next_post_title":"\u751f\u4ea7\u73af\u5883\u9891\u7e41\u5806\u5185\u5b58\u4f7f\u7528\u7387 90% \u544a\u8b66\uff0c\u8c03\u5927\u5185\u5b58\u7adf\u7136\u6ca1\u6709\u6548\u679c\uff01\u8bb0\u4e00\u6b21\u7ebf\u4e0aJVM \u4f18\u5316\u3002","previous_post_id":3099,"previous_post_title":"\u8bb0\u4e00\u6b21 JVM CPU \u4f7f\u7528\u7387\u98d9\u9ad8\u95ee\u9898\u7684\u6392\u67e5\u8fc7\u7a0b","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/3749","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=3749"}],"version-history":[{"count":0,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/3749\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media\/3747"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=3749"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=3749"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=3749"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}