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Java Java内存分配

[英]java jvm memory assignment

原文 2013-07-26 19:48:47 5 1 java/ memory

I have a program that is very memory consuming and thought to assign more maximum memory to the java jvm using -Xmx2048m. 我有一个程序非常消耗内存，并考虑使用-Xmx2048m为Java jvm分配更多的最大内存。 But when starting I get a 'Could not reserve enough space for object heap' error. 但是启动时，出现“无法为对象堆保留足够的空间”错误。

When trying several values and found out that my greatest value is -Xmx1560m and it starts. 当尝试多个值时，发现我的最大价值是-Xmx1560m并开始。 But I like to assign 2GB. 但是我喜欢分配2GB。 I have 6GB physical Memory and Taskmanager shows 3400MB available after I started the java-process with -Xmx1560m. 我使用-Xmx1560m启动Java进程后，我具有6GB的物理内存，并且Taskmanager显示3400MB可用。

Do anyone know why I can't assign 2GB ? 有谁知道为什么我不能分配2GB？

1 个解决方案

32-bit windows limits programs to around 1.2 - 1.5 GB of continuous memory. 32位Windows将程序限制为大约1.2-1.5 GB的连续内存。 This limit applies even if you have a 64-bit OS but you are emulating a 32-bit environment for a 32-bit JVM. 即使您具有64位操作系统，但您正在为32位JVM模拟32位环境，此限制也适用。

The way to avoid this limit is to use a 64-bit OS and a 64-bit JVM and the limit is much higher depending on the flavour of Windows you have bought. 避免此限制的方法是使用64位操作系统和64位JVM，并且该限制要高得多，具体取决于您购买的Windows的风格。 Professional edition is limited to 192 GB. 专业版限制为192 GB。