Performance Tuning

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Memory Tuning

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Concept

Procedure

Performance can also be improved by adding memory to your system. This is especially true when working on larger models.

The system requirements for AutoCAD require at least 512 MB of physical memory (RAM) for working in 2D. For creating and working with 3D models, at least 2 GB of RAM is required.

The size and complexity of a model often defines how efficiently an application runs. If you notice increased hard drive activity, it means that physical memory has been exceeded and data is being passed to a swap file (virtual memory).

A swap file is an area on the hard drive that Windows uses as if it were physical memory (RAM). The swap file size is basically a limit which restricts the total virtual size of the AutoCAD process. A good rule of thumb for configuring your swap file is three times the amount of physical memory on your system. This usually sets the limit high enough that AutoCAD doesn't run out of swap space.

Typically, systems are limited to a maximum of 2 GB of virtual memory. On some systems, you can set the /3GB switch that allows applications to use up to 3 GB of virtual memory. Before attempting to set the switch, you need to find out the following:

• If your system supports the switch.
• If other device drivers (video card, plotter drivers, etc.) may be affected if the switch is set.
• How to set the switch.

Refer to the Microsoft website for details regarding the /3GB switch.