java -xms是什么，讓我們一起了解一下？
-xms是用來設置你的應用程序能夠使用的最大內存數，如果程序要花很大內存的話，那就需要修改增加此數的值。-Xms設置初始Java堆，-Xmx設置最大Java堆。
在Java中，-Xms和-Xmx參數的作用是什么？
其實在Java中， -Xms設置初始Java堆大小，而-Xmx設置最大Java堆大小。
1、一些java -Xms -Xmx示例：
#?Start?with?128MB?of?memory,?and?allow?the?Java?process?to?use?up?to?1024MB?of?memory.?
java?-Xms128m?-Xmx1024m
#?Start?with?256MB?of?memory,?and?allow?the?Java?process?to?use?up?to?4G?(4096MB)?of?memory.
java?-Xms256m?-Xmx4g
2、默認的初始和最大Java堆大小是根據這種人體工程學算法分配的。
3、如果Java進程超出了-Xmx最大Java堆大小，則將引發流行的java.lang.OutOfMemoryError?。
4、對于其他選項，請運行此java -X。
>?java?-X
-Xbatch???????????disable?background?compilation
-Xbootclasspath/a:
append?to?end?of?bootstrap?class?path
-Xcheck:jni???????perform?additional?checks?for?JNI?functions
-Xcomp????????????forces?compilation?of?methods?on?first?invocation
-Xdebug???????????provided?for?backward?compatibility
-Xdiag????????????show?additional?diagnostic?messages
-Xfuture??????????enable?strictest?checks,?anticipating?future?default
-Xint?????????????interpreted?mode?execution?only
-Xinternalversion
displays?more?detailed?JVM?version?information?than?the
-version?option
-Xloggc:????log?GC?status?to?a?file?with?time?stamps
-Xmixed???????????mixed?mode?execution?(default)
-Xmn????????sets?the?initial?and?maximum?size?(in?bytes)?of?the?heap
for?the?young?generation?(nursery)
-Xms????????set?initial?Java?heap?size
-Xmx????????set?maximum?Java?heap?size
-Xnoclassgc???????disable?class?garbage?collection
-Xrs??????????????reduce?use?of?OS?signals?by?Java/VM?(see?documentation)
-Xshare:auto??????use?shared?class?data?if?possible?(default)
-Xshare:off???????do?not?attempt?to?use?shared?class?data
-Xshare:on????????require?using?shared?class?data,?otherwise?fail.
-XshowSettings????show?all?settings?and?continue
-XshowSettings:all
show?all?settings?and?continue
-XshowSettings:locale
show?all?locale?related?settings?and?continue
-XshowSettings:properties
show?all?property?settings?and?continue
-XshowSettings:vm
show?all?vm?related?settings?and?continue
-XshowSettings:system
(Linux?Only)?show?host?system?or?container
configuration?and?continue
-Xss????????set?java?thread?stack?size
-Xverify??????????sets?the?mode?of?the?bytecode?verifier
以上就是小編今天的分享了，希望可以幫助到大家。
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