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ANSWER: No. I used ls --time=atime --sort=time -r /usr/lib64/libfft* to see if the access time changes after running CASA. They did not. But when running my own installation of CASA6, the fft libraries in that installation did update their access time.
QUESTION: does adding system.resources.cores: 1 to ~/.casarc change threading in CASA-6?
ANSWER: No. and images are still different depending on cpuset.
- cpuset=0,2,4,6,8,10,12,14 -n 8 produces max threads of 23
- cpuset=0,1,2,3,5,7,9,11 -n 8 produces max threads of 19