qstat -f or qstat -fx gives the detailed job information.
mem = actual memory
vmem = mem + swap (a kind of)
Ref: PBS Professional 18.2.3 Installation & Upgrade Guide IG-100
If you were using vmem at the queue or server level before the upgrade, then after upgrading you must add vmem to the new resource_unset_infinite sched_config option. Otherwise jobs requesting vmem will not run.
If “vmem” is part of the job request, then it will become part of qstat -f or -fx output
For example: qsub -l select=1:ncpus=1:mem=10gb:vmem=1gb
Otherwise, you can inject available swap and used swap into the job’s data using execjob_epilogue.