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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.