Changing the Scheduler Configuration With QMON

On the QMON Main Control window, click the Scheduler Configuration button.

The Scheduler Configuration dialog box appears. The dialog box has two tabs:

• General Parameters tab

• Load Adjustment tab

To change general scheduling parameters, click the General Parameters tab. The General Parameters tab looks like the following figure.

Use the General Parameters tab to set the following parameters:

• Algorithm. The scheduling algorithm. See Changing the Scheduling Algorithm.

• Schedule Interval. The regular time interval between scheduler runs.

• Reprioritize Interval. The regular time interval to reprioritize jobs on the execution hosts, based on the current ticket amount for running jobs. To turn reprioritizing off, set this parameter to zero.

• Max Jobs/User. The maximum number of jobs that are allowed to run concurrently per user and per UNIX group. See Restricting the Number of Jobs per User or Group.

• Sort by. The queue sorting scheme, either sorting by load or sorting by sequence number. See Selecting Queue by Sequence Number.

• Job Scheduling Information. Whether job scheduling information is accessible through qstat -j, or whether this information should be collected only for a range of job IDs. You should turn on general collection of job scheduling information only temporarily, in case an extremely high number of jobs are pending.

  Scheduler monitoring can help you find out the reason why certain jobs are not dispatched. However, providing this information for all jobs at all times can consume resources. Such information is usually not needed.

• Load Formula. The load formula to use to sort hosts and queues.

• Flush Submit Seconds. The number of seconds that the scheduler waits after a job is submitted before the scheduler is triggered. To disable the flush after a job is submitted, set this parameter to zero.

• Flush Finish Seconds. The number of seconds that the scheduler waits after a job has finished before the scheduler is triggered. To disable the flush after a job has finished, set this parameter to zero.

• Maximum Reservation. The maximum number of resource reservations that can be scheduled within a scheduling interval. See Resource Reservation and Backfilling.

• Params. Use this setting to specify additional parameters to pass to the scheduler. Params can be PROFILE or MONITOR. If you specify PROFILE, the scheduler logs profiling information that summarizes each scheduling run. If you specify MONITOR, the scheduler records information for each scheduling run in the file sge-root/cell/common/schedule.

By default, the grid engine system schedules job runs in a fixed schedule interval. You can use the Flush Submit Seconds and Flush Finish Seconds parameters to configure immediate scheduling. For more information, see Immediate Scheduling.

To change load adjustment parameters, click the Load Adjustment tab. The Load Adjustment tab looks like the following figure:

Use the Load Adjustment tab to set the following parameters:

• Decay Time. The decay time for the load adjustment.

• A table of load adjustment values listing all load and consumable attributes for which an adjustment value is currently defined.

  To add load values to the list, click the Load or the Value column heading. A selection list appears with all resource attributes that are attached to the hosts.

  The Attribute Selection dialog box is shown in Figure 1–2. To add a resource attribute to the Load column of the Consumable/Fixed Attributes table, select one of the attributes, and then click OK.

  To modify an existing value, double-click the Value field.

  To delete a resource attribute, select it, and then press Control-D or click mouse button 3. A dialog box asks you to confirm the deletion.

See Scaling System Load for background information. See the sched_conf(5) man page for more details about the scheduler configuration.