Microsoft Windows
E.1.1 Memory usage
E.1.1.1 Allow up to 3GB of memory usage under 32-bit Windows
By default, 32-bit Windows versions allow applications to run in a 2GB memory space. Applications that attempt to use more than this 2GB limit will crash. When working with very large data sets, it may no longer be possible to fit the required data into the default memory space supplied by Windows. Using the /3GB switch in boot.ini allows certain applications to access up to 3GB of virtual address space leaving 1GB for the windows kernel.
To allow HelixTree to use more than 2GB of memory, you can edit your system’s boot.ini file.
To open the boot.ini file:
- Click Start, click Run.
- Enter sysdm.cpl, and click OK.
On the resulting window, select the Advanced tab, and click Settings under Startup and Recovery. Next, click the Edit button in the System startup group.
Now the boot.ini file should be open in a Notepad editor. Before you edit the file, it is recommended that you create a backup of the original. To do this: select File->Save As..., and choose a location to create the backup file. Close the Notepad editor, and click the Edit button again. Now you should be ready to edit the file.
To allow HelixTree to use up to 3GB of memory add the entry /3GB to the end of the line under the [operating systems] section corresponding to your current configuration. Save the file to keep this option. A reboot is required before the change will take effect.
E.1.1.2 Memory Availability Under 64-bit Windows
Windows XP Professional x64 Edition (for PCs with x86-64 processors) is capable of running HelixTree in its 32-bit emulation mode efficiently and allows the application to address up to 4 GB of virtual memory if available. Windows XP 64-bit Edition (built for Intel’s IA-64 Itanium processors) is discontinued as an operating system as of 2005, and is not supported by Golden Helix Inc.
