Slurm memory resource management

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Despite a thorough read of https://slurm.schedmd.com/slurm.conf.html, there is several things I don't understand regarding how Slurm manages the memory resource. My slurm.conf contains

DefMemPerCPU=1000
SchedulerType=sched/backfill
SelectType=select/cons_res
SelectTypeParameters=CR_Core_Memory
NodeName=orion Gres=gpu:RTX2080Ti:4 MemSpecLimit=2048 RealMemory=95232
  1. When not specifying --mem, jobs are launched with MIN_MEMORY=0 and don't seem to fail when allocating memory. What is the maximum memory job can use and how to display it?
  2. When specifying --mem=0, jobs are pending waiting for resources. How can this be?
  3. The value provided in DefMemPerCPU=1000 doesn't seem to have an effect. Is it related to SelectTypeParameters=CR_Core_Memory? If so, what is the equivalent for CPU cores?
  4. Ultimately, what should be the configuration for having a default memory limit?
slurm
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