[ofiwg] DS/DA - updated slides for today

Atchley, Scott atchleyes at ornl.gov
Tue Feb 2 09:07:56 PST 2016

Hi Paul,

Regarding slide 31 and your comment about adding yellow NVDIMM on the left side of the client, if we are talking about userspace processes, than I would definitely say yes. I assume that the userspace libfabric will have a shared memory provider that uses mmapped bounce buffer in the worst case and single-copy mechanisms such as Linux’s Cross Memory Attach (CMA) or SGI’s XPMEM. Because the processes have different address spaces and each process will end up with a copy of the data, using message queues and RMA make sense.

In the kernel, however, there is a single address space and I am not sure if having two copies is beneficial in any way. If so, then I am not sure if it makes sense to access local resources via kfabric.


> On Feb 2, 2016, at 10:54 AM, Paul Grun <grun at cray.com> wrote:
> Incorporated comments from Bernard and Stan
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