Differentiate slots between CPU and memory usage

[pmenzel]

Currently, configured memory is divided by the number of configured threads, and that is assigned to one slot. This causes bad resource usage, if there is a job with a few threads and a lot of memory, and a job with a lot of threads but low memory requirement.

Example

Machine with 40 threads and 2 TB of memory. So 40 slots in total.

Job A requests 16 threads and 30 GB of memory, and occupies 16 slots. Now job B with 1 thread and 1.8 TB of memory is not run despite the resources being free.

group=joey(1993):86926 jobs_max=1 slots_max=36 memory_max=1843200 slots_per_job=36 memory_per_job_thread=1843200.000000 :: group initialized.