CAD tip # 4905:

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Using multiprocessing in AutoCAD.

All Autodesk's CAD products based on AutoCAD 2000i, 2002, 2004, 2005, 2006, 2007, 2008, 2009 and higher are multi-threaded, display operations run on multiple processors.

The WHIPTHREAD variable controls the way how AutoCAD uses the second processor (or core) for display operations.

0 - use only a single processor (as A2000)
1 - regen done on multiple CPUs
2 - redraw done on multiple CPUs
3 - both regens and redraws done on multiple CPUs

Multi-CPU and multithreading systems are used by AutoCAD also for other operations, e.g. for the mental ray rendering (2007 and higher), background publishing, xref loading, or for background loading of .NET Framework.

Intel processors with the hyperthreading (HT) and dual-core technology are considered by the operating system as multiprocessor PCs.

ACAD2000iACAD2002ACAD2004ACAD2006ACAD2009MDTADT

WinXP,Vista CAD

19.3.2006 29477x FAQ

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applies to: AutoCAD 2000i · AutoCAD 2002 · AutoCAD 2004 · AutoCAD 2006 · AutoCAD 2009 · Mechanical Desktop · AutoCAD Architecture ·

See also:
Tip 5847:	An undocumented AutoCAD command sets CPU affinity.
Tip 2075:	How to enable multiple CPU support in 3D Studio VIZ or MAX or Inventor?
Tip 1215:	Does 3D Studio VIZ, MAX and LightScape make use of a second processor in my PC?
Tip 991:	Will Inventor run faster on a multiprocessor PC?
Tip 774:	AutoCAD crashes on a 2-processor PC.

Selected tip: How to find the viewport scale?

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