![]() The -X options are non-standard and subject to change without notice. Show all locale related settings and continue Show all property settings and continue -XshowSettings:locale Show all settings and continue -XshowSettings:vm show all vm related settings and continue -XshowSettings:properties XshowSettings show all settings and continue -XshowSettings:all Xshare:auto use shared class data if possible (default ) -Xshare:on require using shared class data, otherwise fail. Xshare:off do not attempt to use shared class data Xrs reduce use of OS signals by Java/VM (see documentation ) -Xcheck:jni perform additional checks for JNI functions Xfuture enable strictest checks, anticipating future default Xloggc: log GC status to a file with time stamps ![]() Xincgc enable incremental garbage collection Xnoclassgc disable class garbage collection Xdiag show additional diagnostic messages ![]() Set search path for bootstrap classes and resources $ java -X -Xmixed mixed mode execution (default ) -Xint interpreted mode execution only You’ll need to convert manually to MB or GB. It will show xms (InitialHeapSize) and xmx (MaxHeapSize) in bytes. Maximum heap size of 1/4 of physical memory (for Xmx)Īn easy way to determine the default settings is to use the Print Flags option.Initial heap size of 1/64 of physical memory (for Xms).Typically, the default values are calculated as follows: The answer is that the HotSpot JVM contains performance-boosting just-in-time (JIT) compilation technology that profiles your program’s execution and selectively optimizes the parts it decides will benefit the most. server vs -client) and other factors like JVM implementation and version. It depends on the amount of physical memory of the system, JVM mode (e.g. The default values vary and depend on different factors. Xms: we can use this command to set a minimum or initial heap size. If these are not provided, the Java Virtual Machine (JVM) will use default values for them. Xmx to set maximum heap size (max memory) This command sets the maximum heap size as 512Mb. It’s important to note that both Xmx and Xms are optional. Xmx1024000k or Xmx1024000K: Sets the maximum memory size to 1024000 kilobytes. ![]()
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