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[Solved] Acad: 50% CPU when hanging; 9% CPU when working

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Peter2:
(This happened on Map 2018; but I suppose this is a basic question).

AFAIK AutoCAD uses is not "multi-threading", so it uses only one thread. My PC has 6 Cores and 12 Threads, and when I run the Cadalyst-benchmark, I get a CPU of approx. 8% (100%Total / 12cores = 8% full load of one core).

See Picture.

When it "began to hang" in MAP 2018 - I can still work, but I see that the CPU is going to 20-25%. Continuing work, and then close database and close drawing - so Acad should to absolutely nothing - I have a stable CPU load of 50%, spread over all cores.

See other picture.

How can this happen? 50% on a one-thread-application?

Does it happen to others too?

rkmcswain:
Who knows. I doubt anyone at Autodesk could even answer this.
There are certain functions that are multi-threaded in ACAD however, such as rendering and Regen.

This document says only 2D regens....
https://knowledge.autodesk.com/support/autocad/learn-explore/caas/sfdcarticles/sfdcarticles/Support-for-multi-core-processors-with-AutoCAD.html

while this Autodesk employee says it's for 2D regens _and_ rendering:
https://forums.autodesk.com/t5/autocad-forum/new-multithread-multi-core-support/m-p/8718450#M975483

dgorsman:
Change to something like System Monitor to look at actual activity.  Seeing as this is Map3D there may be extra daemons/database "stuff" involved that doesn't apply to vanilla.

Peter2:
Just to add more information: I found that when Acad hangs (run with 16.6% CPU load) I have
- 8.33% CPU from acad.exe
- 8.33% CPU from AdDownloaderCore.dll

See image



EDIT:
Seem to be solved. Searching for AdDownloaderCore.dll brings a lot of results, starting from 2012 until 2018.
Solution:
rename the DLL

Links:
http://docs.autodesk.com/MAP/2013/ENU/files/readme-map.htm
https://forums.autodesk.com/t5/autocad-forum/autocad-uses-100-cpu-core/m-p/8402750/highlight/false
https://knowledge.autodesk.com/support/autocad/troubleshooting/caas/sfdcarticles/sfdcarticles/AutoCAD-does-not-respond-waiting-for-svchost-exe-process-in-Resource-Monitor.html

rkmcswain:
@Peter2 - thanks for this valuable information, the screen shot, and the links!

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