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AutoCAD randomly uses 100% CPU
We have written a small test executable which does the following:
1) Launch autocad using the command line "acad.exe /product ACAD /b startup.scr"
2) Observe the CPU usage of the acad process for 30 seconds.
3) If the last 10 seconds of CPU usage average more than 40%, quit and show an error.
4) Kill the acad.exe process and repeat.
Contents of startup.scr can be just some comments.
We have found that, randomly, acad.exe will attempt to grab all CPU usage (90%+) ... we have observed this behaviour within as little as 3 iterations, and as many as 440. The test was executed on a Windows 10 VMware machine.
Launching acad.exe without the /b switch ran for over 1000 iterations without error before we stopped it, so it is definitely related to that startup switch. I notice that using this switch automatically creates a blank drawing, so that may be related.