Memory's using limitation

It’s a part of pbs_cgroups.json:


I don’t know if I understand, does it mean that, if I don’t apply memory explicitly, pbs will limit the memory to use under 256MB?

If in case your job does not request any memory when submitting a job via qsub. Then 256MB of memory is assigned to the job by default.
e.g.:

qsub -l select=1:ncpus=2 -- /bin/sleep 1000

Refer: https://help.altair.com/2024.1.0/PBS%20Professional/PBS2024.1.pdf
Section:
6.5.3.9.iii Assigning a Default Amount of Memory to Jobs
6.5.3.9.ix memory Subsystem Configuration Parameters