动态批改JVM 部分参数

动态修改JVM 部分参数

参考地址：?http://rednaxelafx.iteye.com/blog/1049240

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查看哪些参数可动态修改

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$java -XX:+PrintFlagsFinal | grep manageable      intx CMSAbortablePrecleanWaitMillis            = 100             {manageable}             intx CMSWaitDuration                           = 2000            {manageable}             bool HeapDumpAfterFullGC                       = false           {manageable}             bool HeapDumpBeforeFullGC                      = false           {manageable}             bool HeapDumpOnOutOfMemoryError                = false           {manageable}            ccstr HeapDumpPath                              =                 {manageable}             bool PrintClassHistogram                       = false           {manageable}             bool PrintClassHistogramAfterFullGC            = false           {manageable}             bool PrintClassHistogramBeforeFullGC           = false           {manageable}             bool PrintConcurrentLocks                      = false           {manageable}             bool PrintGC                                   = false           {manageable}             bool PrintGCDateStamps                         = false           {manageable}             bool PrintGCDetails                            = false           {manageable}             bool PrintGCTimeStamps                         = false           {manageable}

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执行修改

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$ jps31570 Jps15920 Launcher$ jinfo -flag +HeapDumpBeforeFullGC 15920 $ jinfo -flag +HeapDumpAfterFullGC 15920

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注意：

+HeapDumpBeforeFullGC：+号表示设置当前参数为true，-号为false。

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