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java -xms是什麼,讓我們一起了解一下?
-xms是用來設定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設定初始Java堆,-Xmx設定最大Java堆。
在Java中,-Xms和-Xmx參數的作用是什麼?
其實在Java中, -Xms設定初始Java堆大小,而-Xmx設定最大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、對於其他選項,請執行此java -X。
> java -X-Xbatch disable background compilation-Xbootclasspath/a:<directories and zip/jar files separated by ;>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-Xinternalversiondisplays more detailed JVM version information than the-version option-Xloggc:<file> log GC status to a file with time stamps-Xmixed mixed mode execution (default)-Xmn<size> sets the initial and maximum size (in bytes) of the heapfor the young generation (nursery)-Xms<size> set initial Java heap size-Xmx<size> 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:allshow all settings and continue-XshowSettings:localeshow all locale related settings and continue-XshowSettings:propertiesshow all property settings and continue-XshowSettings:vmshow all vm related settings and continue-XshowSettings:system(Linux Only) show host system or containerconfiguration and continue-Xss<size> set java thread stack size-Xverify sets the mode of the bytecode verifier