CAD tip # 4905:

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

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
opening DWG files with raster images

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

ACAD2000iACAD2002ACAD2004ACAD2006ACAD2009MDTADT

WinXP,Vista,Win10,Win11CAD

19.3.2006 87677× FAQ

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

See also:
Tip 14110:	Comparison of speed and CPU core usage in CAM operations of commercial and non-commercial versions of Autodesk Fusion.
Tip 13635:	How to speed up background publishing in AutoCAD?
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?

Selected tip: After creating of new Profile, EN commands (_line e.g.) in old profile cause crash of AutoCAD.

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