CAD Forum - tips, tricks, discussion and utilities for AutoCAD, Inventor, Revit and other Autodesk products []
CZ | EN | DE
Login or
  Visitors: 5831

CAD tip CAD tip # 4905:

Question CAD 
 %  platform  category 
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.

100% WinXP,Vista  CAD 
19.3.2006    86802×   FAQ  
Prices - CAD eShop:

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?

Back   All CAD Tips

Have we helped you? If you want to support the CAD Forum web service, consider buying one of our CAD applications, or our custom software development offerings, or donating via PayPal (see above). You may also add a link to your web - like this "fan" link: CAD Forum - tips, utilities, blocks for Autodesk products
CAD:    OS:    Categ: 
Text:  FAQ glossary   

Use Google Earth images in your AutoCAD projects with the Plex.Earth Tools More info

Please use these tips at your own risk.
Arkance Systems is not responsible for possible problems that may occur as a result of using any of these tips.