[Beowulf] physical memory

[Greg Lindahl]

On Wed, Apr 24, 2013 at 10:30:14AM -0400, Lawrence Stewart wrote:
> Does linux recombine physical memory into contiguous regions?

See: https://lwn.net/Articles/368869/

We find that it's awfully expensive when it's on with our search
engine/nosql workload.

In an HPC setting, you could explicitly trigger it between jobs.
Worth experimenting to see if a drop caches helps or hurts when you do
this -- less stuff to copy around.

-- greg