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• Visibility: Public
• Change Control: Stable
• Details:
  • Scheduler now has additional attributes which can be set in order to run it.
    • sched_priv - to point to the directory where scheduler keeps the fairshare usage, resource_group, holidays file and sched_config
    • sched_logs - to point to the directory where scheduler logs.
    • partitions - list of all the partitions for which this scheduler is going to schedule jobs.
    • host - hostname on which scheduler is running. For default scheduler it is set to pbs server hostname.
    • port - port number on which scheduler is listening.
    • state - This attribute shows the status of the scheduler. It is a parameter that is set only by pbs server.
  • One can set a partition or a comma separated list of partitions to scheduler object. Once set, given scheduler object will only schedule jobs from the queues attached to specified partition"
    • qmgr -c "s sched multi_sched_1 partitions='part1,part2'"
  • If no partition are specified for a given scheduler object, other than the default scheduler where no partition value can be set, then that scheduler will not schedule any jobs.
  • By default, All new queues created will be scheduled by the default scheduler, until they have been assigned to a specific partition.
  • A partition once attached to a scheduler can not be attached to a second scheduler without removing it from the first scheduler. If tried, then it will throw following error:
    • qmgr -c "s sched multi_sched_1 partitions+='part2'"
      Partition part2 is already associated with scheduler <scheduler name>.
  • Scheduler object "state" attribute will show one of these 3 values  - DOWN, IDLE, SCHEDULING
    • If a scheduler object is created but scheduler is not running for some reason state will be shown as "DOWN"
    • If a scheduler is up and running but waiting for a cycle to be triggered the state will be shown as "IDLE"
    • If a scheduler is up and running and also running a scheduling cycle then the state will be shown as "SCHEDULING"
  • The default sched object is the only sched object that cannot be deleted.
  • Trying to set sched_port, sched_priv and sched_host on default scheduler will not be allowed. The following error message is thrown in server_logs when we try to change sched_priv directory.
    • qmgr -c "s sched default sched_priv = /tmp
      Operation is not permitted on default scheduler
  • Trying to start a new scheduler other than the default scheduler, without assigning a partition it won't come up and the following error message is thrown in sched_logs.
             Scheduler should contain at least single partition
  • Trying to start a new scheduler other than the default scheduler which is not known to the server, without assigning a partition it won't come up and the following error message is thrown in sched_logs.

            update_svr_schedobj, Unable to retrieve the scheduler attributes from server

  • If Scheduler fails to update the new value of its sched_log directory to the server then the following error message is shown in the sched_logs.
            Failed to update log_dir value <value or path of the log directory> at the server

  • If Scheduler fails to update the new value of its sched_priv directory to the server then the following error message is shown in the sched_logs. 
           Failed to update sched_priv value <value or path of the log directory> at the server

  • If Scheduler is not able to open the new log directory configured then the following error message is shown in the sched_logs.
           Failed to open the log file in dir <value or path of the log directory>

  • In all of the above three cases scheduler will switch back to its original directory throwing the following error message in the sched_logs.
           Switching back to previous directory <value of path of the log directory>

  • If Scheduler is successful in accepting the new log_dir configured at qmgr then the following error message is thrown in the sched_logs.
           Scheduler log directory is changed to <value of path of the log directory>

  • If Scheduler is successful in accepting the new sched_priv configured at qmgr then the following error message is thrown in the sched_logs.
           Scheduler log directory is changed to <value of path of the log directory> 

  • If sched_priv or sched_log directories does not meet the security validations then the following error message is thrown in the sched_logs.
           PBS failed validation checks for directory <value of path of the log directory>                                                                                                                                                                                                                                                                          

    
    

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