Memory Tuning for Large Applications

OutOfMemory errors can occur when you migrate, compile, or build a large PowerBuilder .NET application. To prevent these errors, you can turn on 3G memory support for your operating system.

1. Turn on the /3GB switch for your operating system:
   • On Windows XP, add the "/3GB" switch immediately after the "/fastdetect" switch in the system boot.ini file.

     See http://www.fmepedia.com/index.php/How_do_I_turn_on_the_3GB_Switch or http://technet.microsoft.com/en-us/library/bb124810(EXCHG.65).aspx for information on editing the boot.ini file.

   • On Windows Vista or Windows 7, right-click Command Prompt in the Accessories program group of the Start menu, select Run as Administrator, then enter "bcdedit /set IncreaseUserVa 3072" and restart the computer.

     You can later remove the /3GB switch by entering "bcdedit /deletevalue IncreaseUserVa" in the same Command Prompt dialog box and restarting the computer.

2. Download and install a tool to enable applications to be large address aware.
3. Use the tool to enable msbuild.exe and csc.exe to be large address aware.
   These build and compile executables are under C:\Windows\Microsoft.NET\Framework, in the subdirectory for the current version. You must enable the executables in separate operations.