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CAD tip CAD tip # 4905:

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Q - question

Using multiprocessing in AutoCAD.

A - answer 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
100% WinXP,Vista  CAD 
19.3.2006    64345x   FAQ  
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See also:
Tip 10881:What is the process acwebbrowser.exe resp. Chromium host executable?
Tip 10219:Can Autodesk Fusion 360 make use of multicore CPUs?
Tip 8529:How to use CUDA GPU to accelerate rendering in 3ds Max?
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?


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