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Enabling scheduling information in qstat -j

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Introduction

sge_execd controls the Sun Grid Engine queues local to the machine on which sge_execd is running and executes/controls the jobs sent from sge_qmaster(8) to be run on these queues. 

The scheduler can keep track why jobs could not be scheduled   during the last scheduler run. This parameter enables or disables the   observation. The value true enables the monitoring false turns it off.

If  schedd_job_info=true, the user can obtain the collected information with the command

qstat  -j job number

The parameter schedd_job_info  is one of the most important parameters that initially set wrong in the default configuration that comes with Grid Engine (Chris Dagdigian)

In this case the change is that with 6.2 the parameter "schedd_job_info" now defaults to FALSE where in the past it was TRUE.

I *completely* understand why the change happened since the 6.2 design goal was for massive scalability and schedd_job_info can put a massive load on the SGE system particularly in massive clusters like Ranger where 6.2 was tested out.

But ... are most 6.2 deployments going on to systems where the exechost count or job throughput rates means that setting schedd_job_info=FALSE has a measurable performance gain, significant enough to offset the massive loss of end-user-accessible troubleshooting information? I suspect ... not.

The schedd_job_info output appended in the output of "qstat -j" is the single most effective troubleshooting and "why does my job not get dispatched" resource that is available to non SGE administrators. Taking this tool away from users (in my opinion) has a bigger negative impact than any performance gains realized (at least for the types of systems I work on most often).

So -- just like I recommend and tell people to use classic spooling on smaller systems I also plan on telling people to re-enable schedd_job_info feature on their 6.2 systems (if their system and workflow allows).

I'm bringing this up on the list for two reasons:

- Just to see what others think

Changing schedd_conf parameter

Change setting of sched_conf from false to true. This setting defines the configuration file format for Grid Engineís scheduler. In order to modify the configuration, use the graphical userís interface qmon(1) or the -msconf option of the qconf command.

A default configuration is provided with the Grid Engine distribution package, but it usually has  the setting  schedd_job_info=false which should be changed to schedd_job_info=true

The command is

qconf -msconf

List of scheduling parameters

  1 algorithm                         default
  2 schedule_interval                 0:0:15
  3 maxujobs                          0
  4 queue_sort_method                 load
  5 job_load_adjustments              np_load_avg=0.50
  6 load_adjustment_decay_time        0:7:30
  7 load_formula                      np_load_avg
  8 schedd_job_info                 true
  9 flush_submit_sec                  0
 10 flush_finish_sec                  0
 11 params                            none
 12 reprioritize_interval             0:0:0
 13 halftime                          168
 14 usage_weight_list                 cpu=1.000000,mem=0.000000,io=0.000000
 15 compensation_factor               5.000000
 16 weight_user                       0.250000
 17 weight_project                    0.250000
 18 weight_department                 0.250000
 19 weight_job                        0.250000
 20 weight_tickets_functional         0
 21 weight_tickets_share              0
 22 share_override_tickets            TRUE
 23 share_functional_shares           TRUE
 24 max_functional_jobs_to_schedule   200
 25 report_pjob_tickets               TRUE
 26 max_pending_tasks_per_job         50
 27 halflife_decay_list               none
 28 policy_hierarchy                  OFS
 29 weight_ticket                     0.010000
 30 weight_waiting_time               0.000000
 31 weight_deadline                   3600000.000000
 32 weight_urgency                    0.100000
 33 weight_priority                   1.000000
 34 max_reservation                   0
 35 default_duration                  INFINITY

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Scheduler monitoring can be helpful to find out the reason why certain jobs are not dispatched (displayed via qstat). However, providing this information for all jobs at any time can be resource consuming (memory and cpu time) and is usually not needed. To disable scheduler monitoring set schedd_job_info to false in scheduler configuration sched_conf(5).

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