...
- Not cpuset
- Not the -n argument to mpicasa.
- OMP_NUM_THREADS but it seems to only increase the thread count if is is greater than 1.
- OMP_NUM_THREADS=1 max threads seen for a python process is 10
- OMP_NUM_THREADS=2 max threads seen for a python process is 11
- OMP_NUM_THREADS=4 max threads seen for a python process is 15
- OMP_NUM_THREADS=8 max threads seen for a python process is 27
- OMP_NUM_THREADS=16 max threads seen for a python process is 51
...
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