g1:
job1
g2:
job2
> parallel dates back to around the same time. It was originally a wrapper that generated a makefile and used make -j to do the parallelization.
find . -type f -name | parallel --jobs 5 process_file
find . -type f -name | xargs -I {} -n 1 -P 5 process_file {} parallel --progress --wd '.' -S '4/fourworkers@blehworker.org,8/eightworkers@eightworkers.org,2/:' "./complicated_command --param1={1} --param2={2} ::: $(some_shellcommand_to_generate_param1_values.sh) ::: $(some_shellcommand_to_generate_param2_values.sh)