动态修改JVM 部分参数

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

?

查看哪些参数可动态修改

?

$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}

?

执行修改

?

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

?

注意：

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

?