Unter Windows XP wird die Speicheradressierung für Bereiche über 2GB erläutert. Mit der Voreinstellung unter XP nützt CATIA V5 nur den Adressbereich bis 2GB Mem aus. Mit dieser nachfolgenden Installationsanweisung geht es über diese Grenze hinaus bis 3 GB. Wie immer gilt, was unten auf unserer Website zum Thema Nutzung der Scripts und Informationen steht.

Accessing more than 2.0 GB of memory onWindows XP

This section describes necessary settings to get access to more than 2.0 GB of memory on WindowsXP within a V5 process.

Background

By default, Version 5 processes on Windows can allocate up to 2.0 GB of memory for storing data and code. The 4 GB address space offered by the operating system being split in two areas of 2 GB each, first 2 GB for user mode, 2 other GB being reserved by the kernel.

On Windows XP, it is possible to increase the default allocation capabilities up to 3.0 GB (3 GB for user mode, 1 GB reserved for kernel). Such capability requires additional tunings in order to be effective : From an operating system standpoint From a Version 5 standpoint Operating System requirements Windows XP Professional is required.

A modification of boot.ini file is needed to activate this capability at the system level. The boot.ini switch /3GB needs to be added in order to make 3 GB available for user mode applications.

For example :

[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="Microsoft Windows XP Professional 3GB" /fastdetect /3GB

multi(0)disk(0)rdisk(0)partition(1)WINDOWS="Microsoft Windows XP Professional" /fastdetect

Notes : Improper modification of the boot.ini file can cause the operating system to be inoperable. For testing purposes of a given hardware configuration, it might be preferable to create several entries in the [operating systems] stanza, as documented in above example, as well as leave a non zero timeout, to allow user selection at boot time between regular boot and boot with the /3GB option; this can allow easy recovery in case the /3GB option causes a problem described in section Additional Operating Considerations below. Modification of the boot.ini file requires administrative privileges.

Do not add the /3GB switch if running Windows NT 4.0 Workstation or Windows 2000 Professional. boot.ini file can me modified using bootcfg.exe utility delivered with Windows XP (see http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q291980 for further details on bootcfg.exe utility) or by editing the file :

1. boot.ini is generally found at the root of C: drive; in a command session (cmd.exe), make file editable : attrib C:boot.ini -r -s

2. edit, modify and save file

3. reset file attributes : attrib C:boot.ini +r +s

4. reboot system to make the change effective Amount of Real memory and paging space should be sized accordingly.

Version 5 required customizations

The Version 5 main executable needs to be made "Large Address Space Aware" in order to effectively take advantage of 3 GB of address space.

In order to do so, one should : locate and make a backup copy of the main executable (say, for example, CNEXT.exe, generally found in C:Program FilesDassault SystemesB10intel_acodein; the same pattern is applicable for DMU.exe or Delmia.exe) run imagecfg.exe on CNEXT.exe in a command session, execute imagecfg.exe -l CNEXT.exe output of above command should be similar to :

CNEXT.exe contains the following configuration information: Subsystem Version of 4.0 Stack Reserve Size: 0x100000 Stack Commit Size: 0x1000 CNEXT.exe updated with the following configuration information: CNEXT.exe contains the following configuration information: Subsystem Version of 4.0 Image can handle large (>2GB) addresses Stack Reserve Size: 0x100000 Stack Commit Size: 0x1000 imagecfg.exe utility can be found on the Windows 2000 Server Resource Kit Supplement One, or from supportdebugi386 folder of a Windows NT 4.0 CD-ROM.

Customers having access to Microsoft Visual Studio 6 development environment can use editbin.exe as an alternative to imagecfg.exe. Using editbin.exe utility, generally found in C:Program FilesMicrosoft Visual StudioVC98in, the syntax is as follows : editbin.exe /LARGEADDRESSAWARE CNEXT.exe One can go back to initial behavior by restoring the original copy of CNEXT.exe (or original copy of main executable modified) and removing /3GB switch from the boot.ini file.

Additional Operating System considerations Some driver may not load correctly when /3GB switch is added to boot.ini. In such case, one would need to apply Service Pack 1 on Windows XP, and tune /3GB configurations with /USERVA switch in boot.ini file. See : Driver May Not Be Loaded with the /3GB Switch http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q319043 If you upgrade your computer to Windows XP Service Pack 1 (SP1) and you are using the /3GB switch or the /USERVA switch with the /3GB switch, Windows may not start. You may also receive an error message that states that one of the registry hives is corrupted.

A supported fix is available from Microsoft through article http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q328269