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

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

ACAD2000iACAD2002ACAD2004ACAD2006ACAD2009MDTADT

WinXP,Vista CAD

19.3.2006 87336× 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: Can I change or add value to the list of displayed lineweights?

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