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+ | ====== More Memory for Rhino 4 - from 2GB to 3GB ====== | ||
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+ | > **Summary: | ||
+ | |||
+ | **Warning: | ||
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+ | **Update:** //4 Nov 2007 - Recently, a Rhino user running dual screens on an ATI fireGL 5200 w/256, reported scrambled display problems. | ||
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+ | **Update 2:** 4 Dec 2007 - After setting the /3GB switch on my own WinXP Pro system, I began having problems getting MSIE7 to exit reliably. | ||
+ | |||
+ | =====Detail===== | ||
+ | Add the /3GB parameter in your **C: | ||
+ | |||
+ | **In Windows 2000 Pro** | ||
+ | |||
+ | multi(0)disk(0)rdisk(0)partition(2)\WINNT=" | ||
+ | |||
+ | **In Windows XP Pro** | ||
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+ | multi(0)disk(0)rdisk(0)partition(2)\WINDOWS=" | ||
+ | |||
+ | **Note:** //To avoid further confusion that by default, the Windows File Explorer does not display " | ||
+ | |||
+ | **In Windows Vista** | ||
+ | |||
+ | C:\Boot.ini has been replaced with the Boot Configuration Data Store | ||
+ | |||
+ | BCDEDIT /export " | ||
+ | |||
+ | BCDEDIT /set increaseuserva <color red> | ||
+ | |||
+ | **Note:** //In Windows Vista the BCDEDIT utility is used to first export and then modify the BCD store.// | ||
+ | BCDEDIT is a command line utility and is run from a CMD Window. | ||
+ | |||
+ | =====Background===== | ||
+ | |||
+ | Operating systems based on Microsoft® Windows NT® technologies have always provided applications with a flat 32-bit virtual address space that describes 4 gigabytes (GB) of virtual memory. | ||
+ | |||
+ | The address space is usually split so that 2 GB of address space is directly accessible to the application and the other 2 GB is only accessible to the Windows executive software. | ||
+ | |||
+ | In response to customer requests, Microsoft Windows XP Professional provides applications with a 3-GB flat virtual address space, with the kernel and executive components using only 1 GB. | ||
+ | |||
+ | The virtual address space of processes and applications is still limited to 2 GB unless the /3GB switch is used in the Boot.ini file. | ||
+ | |||
+ | The /3GB switch allocates 3 GB of virtual address space to an application that uses IMAGE_FILE_LARGE_ADDRESS_AWARE in the process header. This switch allows applications to address 1 GB of additional virtual address space above 2 GB. | ||
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+ | =====If you experience video driver problems when using the /3GB switch (WinNT/ | ||
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+ | If after adding the /3GB switch to boot.ini, you find upon rebooting that your video driver is not working properly (you' | ||
+ | |||
+ | <color red> | ||
+ | |||
+ | You can find more information on this switch at: http:// | ||
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+ | Also, when modifying boot.ini, we advise you to include your changes as a second copy of the OS, so that if your changes are unsuccessful you can simply choose your original configuration on bootup. Here's an example Windows XP Pro boot.ini which might be useful while testing the /3GB & /USERVA switches: | ||
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+ | |||
+ | [boot loader] | ||
+ | timeout=30 | ||
+ | |||
+ | default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS | ||
+ | |||
+ | [operating systems] | ||
+ | multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=" | ||
+ | |||
+ | multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=" | ||
+ | |||
+ | =====If you experience problems when using the " | ||
+ | |||
+ | If after changing the memory setting using BCDEDIT, you can restore your original setting provided you made a backup. | ||
+ | |||
+ | BCDEDIT /import " | ||
+ | |||
+ | More information on BCDEDIT: | ||
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+ | http:// | ||
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+ | http:// | ||
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+ | |||