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• Visibility: Public
• Change Control: Stable
• Synopsis: PBSTestSuite.setUp() needs to be able to revert to the 'out-of-box' PBS configuration on Cray.
  
• Details: PBSTestSuite.setUp() calls several functions. The changes made in the settings in these functions are often not desirable on Cray because the MoM, scheduler, and server settings get reverted to plain Linux default settingsout-of-box configurations.

Out-of-box configuration of PBS on Cray:

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• • These lines should appear in PBS_HOME/mom_priv/config:
  •         $vnodedef_additive 0
  •         $alps_client /opt/cray/alps/default/bin/apbasil
  •         $usecp ' *:/home /home'
    
    Notes: $usecp setting above is used to enable local copy of job output of jobs that ran on compute nodes.
    $vnodedef_additive 0 will allow MoM to tell the server that there are vnodes missing, which the server will mark as stale.

2) Scheduler

• • PBS_HOME/sched_priv/sched_config will have 'vntype' in the resources line.

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• • The hook PBS_HOME/server_priv/hooks/PBS_translate_mpp.HK is enabled.
  • Based on what is returned by the ALPS inventory :
    • vnodes representing the compute nodes will get created
    • the Cray-specific custom resources (e.g. PBScraynid, PBScrayhost, etc) will get created in PBS_HOME/server_priv/resourcedef.
    • the appropriate Cray-specific custom resources will be added to the vnodes.
    • since the mom config $vnode_per_numa_node is unset by default, there will be no PBScrayseg attribute on the vnodes representing the compute nodes.
  • Server settings :
    • flatuid = true
      
    • scheduling = true
    the default queue is workq 
    
    • 
      

Design of PBSTestSuite.setUp() for Cray

The affected functions are shown belowIn order to revert o out-of-box configuration of PBS on Cray, per PBS daemon:

1) MoM:

• In pbspro/test/fw/ptl/lib/pbs_testlib.py, class MoM, method __init__()if on real Cray or Cray ALPS simulator, then add these (key, value) pairs to the dictionary self.dflt_config :
• ('$vnodedef_additive', 0)
• ('$alps_client', '<path to apbasil>')
('$usecp' 'initialize the PBS_HOME/mom_priv/config to have these:

$vnodedef_additive 0

$alps_client /opt/cray/alps/default/bin/apbasil

$usecp *:/home /home

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2) Scheduler:

• In pbspro/test/fw/ptl/lib/pbs_testlib.py, class Scheduler, method revert_to_defaults()After copying the out-of-box scheduler configuration in PBS_EXEC/etc/pbs_sched_config to PBS_HOME/sched_priv/sched_config :
  • If platform is a real Cray or Cray ALPS simulator, then add "vntype" to resources line of PBS_HOME/sched_priv/sched_config.

3) Server:

• • 3a) resources
    • In pbspro/test/fw/ptl/lib/pbs_testlib.py, class Server, method revert_to_defaults()in the "if revertresources:" clause, after removing resourcedef,As part of reverting resources, the PBS_HOME/server_priv/resourcedef file is removed.
      
      • if on Cray or Cray ALPS simulator, then recreate the out-of-box Cray-specific custom resources and vnodes,
        including the ones PBS creates from reading the ALPS inventory, by:
        • Checking that $alps_client and its value exists in PBS_HOME/mom_priv/config, and if so:
          • delete all the vnodes: qmgr -c "delete node @default"
          • add back the MoMs: qmgr -c "c n <MoM hostname>"
          • if successful, then
            
            • the resourcedef file and the vnodes would have reverted to the out-of-box Cray settingsreturn True for revert_to_defaults()configuration.
          • If there is an error during one of the following:
            • checking if $alps_client is properly configured
            • deleting all vnodes
            • adding MoMs
            then raise an exception. This will cause revert_to_defaults() to return False.
            
            
  • 3b) hooks
    • In pbspro/test/fw/ptl/lib/pbs_testlib.py, class Server, method revert_to_defaults()in the "if reverthooks:" clause, after all hooks are disabled,As part of reverting hooks, all hooks, except built-in hooks, are disabled.
      
      • if on a Cray ALPS simulator, then enable the PBS_translate_mpp.HK hook.
      • If there is an error during enabling of the PBS_translate_mpp.HK hook, then raise an exception is raised.  This will cause revert_to_defaults() to return False.