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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.
Execds report load status periodically to qmaster
Balance between load and information
Execd goes into unknown state after max_unheard
Options: -help Prints a listing of all options.
sge_execd usually is started from root on each machine in the Sun Grid Engine pool. If started by a normal user, a spool directory must be used to which the user has read/write access. In this case only jobs being submitted by that same user are handled correctly by the system.
sgepasswd contains a list of user names and their corresponding encrypted passwords. If available, the password file will be used by sge_execd. To change the contents of this file please use the sgepasswd command. It is not advised to change that file manually.
$SGE_ROOT/$SGE_CELL/common/configuration Sun Grid Engine global configuration
$SGE_ROOT/$SGE_CELL/common/local_conf/<host> Sun Grid Engine host specific configuration
$SGE_ROOT/$SGE_CELL/spool/<host> Default execution host spool directory
$SGE_ROOT/$SGE_CELL/common/act_qmaster Sun Grid Engine master host file
sched_conf defines the configuration file format for Grid Engine’s scheduler. In order to modify the configuration, use the graphical user’s interface qmon(1) or the -msconf option of the qconf(1) 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 default 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.
It is also possible to activate the observation only for certain jobs.
This will be done if the parameter is set to job_list followed by a
comma separated list of job ids.
If schedd_job_info=true, the user can obtain the collected information with the command
qstat -j job number
One of the important parameters in this file is schedd_job_info which determined whether qstat -j provides information about jobs (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
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
If a load sensor is configured for sge_execd via either the global host configuration or the execution-host-specific cluster configuration (See sge_conf(5).), the executable path of the load sensor is invoked by sge_execd on a regular basis and delivers one or multiple load figures for the execution host (e.g. users currently logged in) or the complete cluster (e.g. free disk space on a network wide scratch file system). The load sensor may be a script or a binary executable. In either case its handling of the STDIN and STDOUT streams and its control flow must comply to the following rules:
The load sensor must be written as an infinite loop waiting at a certain point for input from STDIN. If the string "quit" is read from STDIN, the load sensor should exit. When an end-of-line is read from STDIN, a load data retrieval cycle should start. The load sensor then performs whatever operation is necessary to compute the desired load figures. At the end of the cycle the load sensor writes the result to stdout. The format is as follows:
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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
- Because I am legitimately concerned that this change removes a massively useful tool from the hands of the users and SGE admins who are deploying on small to midsized clusters. Small cluster operators won't see by default a crucial troubleshooting resource just so that big cluster operators get better scalability out of the box.
I'm not advocating that the default be changed but perhaps we need (if people agree) to be very vocal about the usefulness of schedd_job_info=TRUE. I'm thinking that this needs to go into some tuning howtos or wiki pages that concentrate on getting the most out of your SGE systems. I just have a gut feeling that new people deploying SGE 6.2 are going to be unaware of a really useful troubleshooting tool because it is now disabled in the default installation template.
-Chris
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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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