Does GDRcopy support the HPE/Cray "SlingShot" backbone?

[cponder]

I'm looking into a performance issue with an app. If you could tell me up-front whether you support this kind of cluster, it would save some troubleshooting time.

[AddyLaddy]

Carl, the libfabric plugin and the NCCL plugin have both been able to use GDRCopy on a SlingShot based machine.

See Jim's patch: https://github.com/aws/aws-ofi-nccl/pull/146

[cponder]

Do you know if UCX can use it? I'll check with the UCX people...

[pakmarkthub]

Do you mean "can UCX use GDRCopy?" ? I believe that UCX will use GDRCopy if the compile-time options / runtime environments are satisfied. The code is here: https://github.com/openucx/ucx/tree/master/src/uct/cuda/gdr_copy.