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Community discussion is located here: http://community.pbspro.org/t/pp-719-enhance-setup-in-ptl-specifically-for-cray-platforms/463

InterfaceOverview: setUp() 

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PBSTestSuite

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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

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out-of-box configurations.

Out-of-box configuration of PBS on Cray:

• PBS is installed and configured on Cray which result in specific settings. These initial settings are referred to as the out-of-box settings below.  These settings should also apply to the Cray ALPS simulator when PBS is properly configured.  These are settings for a freshly installed and configured PBS on Cray or Cray ALPS simulator.

• As of current support for Cray CLE 5.2 and 6.0, below are the out-of-box configuration settings per PBS daemon:

1)  MoM

• • These settings lines should appear in PBS_HOME/mom_priv/config:
  •         $vnodedef_additive 0
  •         $alps_client /opt/cray/alps/default/bin/apbasilclient <path to ALPS API>
  •         $usecp ' *:<Absolute path to /home /home'directory>  <Absolute path to /home directory>
    
    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_EXECHOME/etcsched_priv/pbs_sched_config will have 'vntype' in the resources line.

3) Server

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In pbspro/test/fw/ptl/lib/pbs_testlib.py, class MoM, method
• • 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 below:

1) MoM:

• • • workq

Interface:  MoM.__init__() 

• Visibility: Public
• Change Control: Stable
• Synopsis: Modifications to include initial MoM config settings for Cray.
  
• Standing of the interface : modified interface
  
• Details
  • 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' '*:/home /home')

2) Scheduler:

• In pbspro/test/fw/ptl/lib/pbs_testlib.py, class Scheduler, method
  • initialize the PBS_HOME/mom_priv/config to have these:

  • $vnodedef_additive 0

  • $alps_client <path to ALPS API>

  •                $usecp *:<Absolute path to /home directory>  <Absolute path to /home directory>

Interface:  Scheduler.revert_to_defaults() 

• Visibility: Public
• Change Control: Stable
• Synopsis: Modifications to include 'vntype' in sched_config out-of-box settings for Cray.
  
• Standing of the interface : modified interface
  
• Details
  • 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:

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Interface:  PBSTestSuite.revert_mom()

• Visibility: Public
• Change Control: Stable
• Synopsis: Modifications to have additional steps of deleting and creating nodes back, for retaining Cray specific resources.
• Standing of the interface : modified interface
• Details
  • If on a 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 settings
  • return True for revert_to_defaults()
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) hooksIn pbspro/test/fw/ptl/lib/pbs_testlib.py, class Server, method revert_to_defaults()
• in the "if reverthooks:" clause, after all 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
• • then perform below:
    • Delete all nodes and create them back.

Interface: Server.revert_to_defaults()

• Visibility: Public
• Change Control: Stable
• Synopsis: Modifications to hooks settings for Cray.
• Standing of the interface : modified interface
• Details
  
  • If on a Cray or Cray ALPS simulator then perform below:
    • Restore the default 'PBS_translate_mpp' hook by:
      • Copying PBS_EXEC/lib/python/altair/pbs_hooks/PBS_translate_mpp.HK to PBS_HOME/server_priv/hooks/PBS_translate_mpp.HK
hook, then an exception is raised.  This will cause revert_to_defaults() to return False
• • • • • In this way, the shipped version (i.e. default version) of the hook will be in PBS_HOME for any PTL test to enable if desired.