32-bit operating systems (Windows XP and Windows Vista) are capable of addressing 4 GB of virtual address space, however access to this memory is divided evenly between applications and the operating system. On a server with 4GB of RAM installed, and running a 32-bit operating system, only 2GB of address space will be available to applications.
You can direct the operating system to make 3GB of the address space available to applications if you find that VTS requires more than the 2GB of memory that would normally be available. This is likely to occur only in very large applications.
Note: Follow the instructions in this section only if all of the following are true:
• You are running the 32-bit version of VTS.
• Your server has 4GB of RAM installed
• Your server is running a 32-bit operating system.
• You have an application that is currently using more than 1GB of memory.
You can determine the memory in use by opening the About VTS box from the VTS Application Manager.
The 32-bit version of VTS, running on a server with a 64-bit operating system can address 4GB without changes to the system configuration.
The 64-bit version of VTS, running on a server with a 64-bit operating system can address up to 8096GB of memory.
Adjusting the Address Space in Windows XP:
1. Open the Boot.ini file for editing as follows:
a) Right-click My Computer, and then click Properties.
-or-
b) Click Start, click Run, type sysdm.cpl, and then click OK.
c) On the Advanced tab, click Settings under Startup and Recovery.
d) Under System Startup, click Edit.
2. Add the /3G switch to the operating system partition as shown in the following example: (the space marked by “????” in this example, will display your operating system version).
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(2)\WINNT
[operating systems]
multi(0)disk(0)rdisk(0)partition(2)\WINNT="????" /3GB
3. Re-boot your computer.
Further information may be found on Microsoft’s website at:
http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx
Adjusting the Address Space in Windows Vista:
1. Type the following at a Windows command prompt that has been opened with Administrative privileges.
BCDEDIT /Set IncreaseUserVa 3072
2. Re-boot your computer.