Configure swap memory on instances

alces-software / flight-appliance-templates

Orchestration templates for Alces Flight appliances

www.alces-flight.com

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Configure swap memory on instances #18

Open vlj91 opened 7 years ago

vlj91 commented 7 years ago

From @wdm78 on May 15, 2016 16:5

Linux memory management can perform badly when there is no swap memory configured. This enhancement request is to include configuration of a small amount of swap memory on compute and login node instances.

Copied from original issue: alces-software/flight-aws-marketplace#46

vlj91 commented 7 years ago

From @ste78 on May 21, 2016 11:47

@wdm78 what did your investigations find other people are doing with regards to swap on instances that have no local disk?

vlj91 commented 7 years ago

From @wdm78 on May 21, 2016 20:18

General unwritten rule seems to be:

Anything based on EL6 seems to include swap
Any AMIs based on EL7 or Ubuntu seem to not include swap

There are lots of recommendations that swapping on EBS is a terribly bad idea, so possibly we don't want to do this on AWS. I guess it would be useful to be able to have swap enabled, but this is lower priority than I first thought

vlj91 commented 7 years ago

From @mjtko on June 23, 2016 12:44

Seems like this would be a good idea on instances that have ephemeral/instance store available to them, but for others would be a bad plan. Out of our current options, only r3 and g2 nodes have instance store; c4 and m4 types appear not to.