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CASA-5 seems to max out at 8 threads per python process. Here is top output
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND nTH
283497 krowe 20 0 309188 23924 11228 S 0.0 0.0 0:00.06 Xvfb 17
283499 krowe 20 0 309188 23912 11228 S 0.0 0.0 0:00.05 Xvfb 17
283500 krowe 20 0 309188 23924 11228 S 0.0 0.0 0:00.06 Xvfb 17
283502 krowe 20 0 309188 23916 11228 S 0.0 0.0 0:00.06 Xvfb 17
283505 krowe 20 0 309188 23924 11228 S 0.0 0.0 0:00.04 Xvfb 17
283507 krowe 20 0 309188 23916 11228 S 0.0 0.0 0:00.06 Xvfb 17
283508 krowe 20 0 309188 23916 11228 S 0.0 0.0 0:00.06 Xvfb 17
282789 krowe 20 0 1924676 184516 83300 S 0.0 0.0 0:07.27 python 10
282790 krowe 20 0 3862980 2.2g 82424 S 99.7 0.4 0:36.25 python 8
282791 krowe 20 0 3207512 1.6g 82408 S 99.7 0.3 0:35.87 python 8
282792 krowe 20 0 3862964 2.2g 82432 S 99.7 0.4 0:36.07 python 8
282793 krowe 20 0 3207528 1.6g 82412 S 99.3 0.3 0:35.74 python 8
282794 krowe 20 0 3862984 2.2g 82432 S 99.3 0.4 0:36.10 python 8
282795 krowe 20 0 3207548 1.6g 82420 S 99.7 0.3 0:35.73 python 8
282796 krowe 20 0 3886436 2.2g 82084 S 99.7 0.4 0:18.52 python 8
282784 krowe 20 0 105304 3520 2520 S 0.0 0.0 0:00.16 mpirun 2
283407 krowe 20 0 1617236 91660 888 S 0.0 0.0 0:00.00 python 2
283408 krowe 20 0 1617200 91660 888 S 0.0 0.0 0:00.00 python 2
283409 krowe 20 0 1617188 93676 896 S 0.0 0.0 0:00.00 python 2
283411 krowe 20 0 1617240 91652 888 S 0.0 0.0 0:00.00 python 2
283413 krowe 20 0 1617236 91656 888 S 0.0 0.0 0:00.00 python 2
283414 krowe 20 0 1617236 93688 888 S 0.0 0.0 0:00.00 python 2
283415 krowe 20 0 1617232 91648 888 S 0.0 0.0 0:00.00 python 2
...
CASA-6 seems to max out at 39 threads per python3 process. Here is top output
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND nTH
285759 krowe 20 0 4866784 2.2g 69296 S 93.7 0.4 0:35.54 python3 39
285760 krowe 20 0 4964980 2.2g 69300 S 155.6 0.4 0:38.87 python3 39
285761 krowe 20 0 4932320 2.2g 69304 S 75.2 0.4 0:35.55 python3 39
285762 krowe 20 0 4997844 2.2g 69280 S 159.9 0.4 0:38.60 python3 39
285763 krowe 20 0 4997856 2.2g 69300 S 70.5 0.4 0:35.34 python3 39
285764 krowe 20 0 4866776 2.2g 69300 S 160.9 0.4 0:39.06 python3 39
285765 krowe 20 0 4374072 2.2g 68888 S 82.1 0.4 0:14.55 python3 24
285909 krowe 20 0 311248 23936 11232 S 0.0 0.0 0:00.05 Xvfb 17
285911 krowe 20 0 311248 23932 11232 S 0.0 0.0 0:00.04 Xvfb 17
285913 krowe 20 0 311248 23932 11232 S 0.0 0.0 0:00.04 Xvfb 17
285914 krowe 20 0 311248 23932 11232 S 0.0 0.0 0:00.04 Xvfb 17
285916 krowe 20 0 311248 23936 11232 S 0.0 0.0 0:00.04 Xvfb 17
285917 krowe 20 0 311248 23932 11232 S 0.0 0.0 0:00.03 Xvfb 17
285922 krowe 20 0 311248 23936 11232 S 0.0 0.0 0:00.04 Xvfb 17
285758 krowe 20 0 1983876 205980 71444 S 0.3 0.0 0:04.69 python3 12
285756 krowe 20 0 105276 3468 2480 S 0.0 0.0 0:00.17 mpirun 2
277642 krowe 20 0 178140 2760 1200 S 0.0 0.0 0:00.09 sshd 1
277647 krowe 20 0 121564 4180 1900 S 0.0 0.0 0:00.28 bash 1
285720 krowe 20 0 115244 1492 1268 S 0.0 0.0 0:00.00 imagin+ 1
285729 krowe 20 0 115240 1528 1280 S 0.0 0.0 0:00.00 xvfb-r+ 1
285741 krowe 20 0 101684 8072 3448 S 0.0 0.0 0:00.06 Xvfb 1
...