• Maximizing Scheduling Efficiency
• Logging Power-Related Events
• Enabling and Disabling Power Management for All Nodes
• Using Reservations to Lock Down Powered-Off Nodes

18.4.1 Maximizing Scheduling Efficiency

To facilitate more efficient scheduling, it is a good idea to specify the maximum amount of time a power on action will take to complete.

PARCFG[torque]     NODEPOWERONDURATION=2:00

PARCFG[torque]     NODEPOWEROFFDURATION=2:00

With the NODEIDLEPOWERTHRESHOLD parameter, Moab can turn nodes off after they've been idle for a specific amount of seconds. The default value is 60 seconds.

NODEIDLEPOWERTHRESHOLD 600

18.4.2 Logging Power-Related Events

Power actions are considered NODEMODIFY events that are not, by default, recorded. Adding the following line to your configuration file enables recording power-related actions in the events file.

RECORDEVENTLIST +NODEMODIFY

18.4.3 Enabling and Disabling Power Management for All Nodes

You can enable or disable green power management for all nodes while Moab runs by using the changeparam command. For example:

To enable green power management: changeparam NODECFG[DEFAULT] POWERPOLICY=OnDemand
To disable green power management: changeparam NODECFG[DEFAULT] POWERPOLICY=STATIC

The default POWERPOLICY setting is STATIC.

NODECFG[DEFAULT]   POWERPOLICY=OnDemand

18.4.4 Using reservations to lock powered-off nodes

If you power off a node, a green policy may try to turn it back on. If you want the node to remain powered off, you must associate a reservation with it.