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CAD tip CAD tip # 4905:

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Q - question

Using multiprocessing in AutoCAD (how many cores can AutoCAD use?)

A - answer All Autodesk's CAD products based on AutoCAD 2000i, 2002, 2004, 2005, 2006, 2007, 2008, 2009 and higher are multi-threaded, multi-core, display operations run on multiple processors. Nevertheless all geometrical operations in CAD applications and in principle performed as single-threaded (on a single CPU core). For performance comparisons, for most geometric operations it will help better to use a faster CPU with less cores than a CPU with as much cores as possible.

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 (a recommended setting since release 2020)
  • 2 - redraw done on multiple CPUs
  • 3 - both regens and redraws done on multiple CPUs

Multi-CPU, multi-core and multithreading systems are used by AutoCAD also for other operations, e.g. for:

  • mental ray rendering (2007 and higher)
  • background publishing
  • xref loading
  • CAD format conversions
  • background loading of .NET Framework

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

ACAD2000iACAD2002ACAD2004ACAD2006ACAD2009MDTADT
100% WinXP,Vista  CAD 
19.3.2006    77480×   FAQ  

See also:
Tip 12127:AutoCAD slower after obeying the recommendation from DELL Precision Optimizer.
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.


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