[Beowulf] physical memory

Greg Lindahl lindahl at pbm.com
Wed Apr 24 11:27:49 PDT 2013


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



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