Hyperthreading being rolled out all over LXBATCH

A significant fraction of the available batch hardware now support SMT (hyperthreading).
 
Studies have shown that a significant CPU capacity improvement can be made by turning on hyperthreading, so it is being configured on all hardware that supports it - this will effectively double the number of CPU cores visible to those nodes (although the individual cores will be less powerful).
 
The number of batch slots on these machines will not always double due to memeory constraints: there will always be at least 2 GB of memory per batch slot.
 
The configuration is in the BIOS, so requires a server reboot, and the reboot campaign is currently under way. Users of some of the smaller dedicated resources may observe some unavailability of a fraction of their resources while the draining/rebooting campaign is ongoing.

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