为内存密集型应用程序增加JVM最大堆大小

I need to run a Java memory intensive application that uses more than 2GB, but I am having problems to increase the heap maximum size. So far, I have tried the following approaches:

我需要运行一个使用超过2GB的Java内存密集型应用程序，但是我在增加堆最大大小方面存在问题。到目前为止，我尝试了以下方法:

Setting the -Xmx parameter, e.g. -Xmx3000m. This approaches fails at the creation of the JVM. From what I've googled, it looks like that -Xmx must be less than 2GB.
设置-Xmx参数，例如-Xmx3000m。这种方法在创建JVM时失败。从我用谷歌搜索的结果来看，-Xmx应该小于2GB。
Using the -XX:+AggressiveHeap option. When I try this approach I get an 'Not enough memory' error that tells that the heap size is 1273.4 MB, even though my computer has 8GB of memory.
使用- xx:+ AggressiveHeap选项。当我尝试这种方法时，我得到一个“内存不足”的错误，提示堆大小为1273.4 MB，尽管我的计算机有8GB的内存。

Is there another approach that I can try to increase the maximum heap size of the JVM? Here's a summary of the computer specs:

是否有其他方法可以尝试增加JVM的最大堆大小?以下是电脑规格简介:

OS: Windows 7 (64 bit)
操作系统:Windows 7(64位)
Processor: Intel Core i7 (2.66 GHz)
处理器:英特尔酷睿i7 (2.66 GHz)
Memory: 8 GB
8 GB内存:
java -version:
java - version:

java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode, sharing)

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