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Follows the PBS Pro Design Document Guidelines.

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• Link to Developer Forum
• PP-725
• Link to pull request: <Not Yet Implemented>
• Ref :
  1. pbs command "pbs_release_nodes",  section 2.32 in Reference Guide v19.2.3
  2. sub section tittled titled "17.6.2.5 Releasing Vnodes" in Reference Guide v19.2.3

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$ qsub -l select=3:model=abc:mpiprocsncpus=5+3:model=abc:bigmem=true:mpiprocsncpus=1+3:model=def:mpiprocsncpus=32 32  job.scr
120.pbssrv

Now grepping for assigned vnodes we may see :

$ qstat -f 120| egrep exec_vnode
exec_vnode = (nd_abc_1:ncpus=15)+(nd_abc_2:ncpus=15)+(nd_abc_3[0]:ncpus=15)+(nd_abc_3[1]:ncpus=1)+(nd_abc_4_bm:ncpus=1)+(nd_abc_5_bm:ncpus=1)+(nd_abc_6_bm:ncpus=1)+(nd_def_1:ncpus=32)+(nd_def_2:ncpus=32)

Here the first chunk "(nd_abc_1:ncpus=5)" represents the mother superior node while each of the remaining others represent a sister node.

and node statuses as :

$ pbsnodes -av
nd_abc_1
    Mom = nd_abc_1.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = abc
    resources_available.ncpus = 110
    resources_assigned.ncpus = 15

nd_abc_2
    Mom = nd_abc_2.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = abc
    resources_available.ncpus = 110
    resources_assigned.ncpus = 15

nd_abc_3[0]
    Mom = nd_abc_3.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = abc
    resources_available.ncpus = 15
    resources_assigned.ncpus = 15

nd_abc_3[1]
    Mom = nd_abc_3.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = abc
    resources_available.ncpus = 15
    resources_assigned.ncpus = 1

nd_abc_4_bm
    Mom = nd_abc_4_bm.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.bigmem = True
    resources_available.model = abc
    resources_available.ncpus = 1
    resources_assigned.ncpus = 1

nd_abc_5_bm
    Mom = nd_abc_5_bm.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.bigmem = True
    resources_available.model = abc
    resources_available.ncpus = 1
    resources_assigned.ncpus = 1

nd_abc_6_bm
    Mom = nd_abc_6_bm.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.bigmem = True
    resources_available.model = abc
    resources_available.ncpus = 1
    resources_assigned.ncpus = 1

nd_def_1
    Mom = nd_def_1.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = def
    resources_available.ncpus = 32
    resources_assigned.ncpus = 32

nd_def_2
    Mom = nd_def_2.pbspro.com
    state = job-busy
    jobs = 120.pbssrv/0
    resources_available.model = def
    resources_available.ncpus = 32
    resources_assigned.ncpus = 32

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$ pbs_release_nodes -j 120 -k select=model=abc:mpiprocsncpus=5+2:model=abc:bigmem=true:mpiprocsncpus=1

will release the nodes (nd_abc_3[0]:ncpus=15)+(nd_abc_3[1]:ncpus=1)+(nd_abc_6_bm:ncpus=1)+(nd_def_1:ncpus=32)+(nd_def_2:ncpus=32) from the job while retaining the nodes (nd_abc_1:ncpus=15)+(nd_abc_2:ncpus=15)+(nd_abc_4_bm:ncpus=1)+(nd_abc_5_bm:ncpus=1).

The new phase of the job will have below vnodes associated with it 

$ qstat -f 120| egrep exec_vnode
exec_vnode = (nd_abc_1:ncpus=15)+(nd_abc_2:ncpus=15)+(nd_abc_4_bm:ncpus=1)+(nd_abc_5_bm:ncpus=1)

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• The "select" string parameter will be passed to "pbs_relnodesjob()" using its "extend" argument which is of type "char * "

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