[英]java heap allocation
我嘗試如下增加堆大小
C:\Data\Guru\Code\Got\adminservice\adminservice>java -Xms512m -Xmx512m
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.
-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
它給出了如上所述的幫助消息-這是否意味着它已分配?
不,這意味着命令失敗,因為您沒有告訴要運行的內容,例如Main類,例如
java -Xms512m -Xmx512m com.x.MyClass
除此之外,您的選擇是有效的,是的。
不,
您還必須提供類名或jar文件名才能執行。 這些選項僅適用於虛擬機的一個實例。
如果要在應用程序服務器或開發環境中更改Heap分配,則必須查找如何在其中提供JVM選項,並將-Xms選項放入其中。
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