[libfabric-users] Collectives

Biddiscombe, John A. john.biddiscombe at cscs.ch
Tue Feb 15 13:34:49 PST 2022

Endpoint Types  gni     nd      psm2    rxd     rxm     shm     tcp     udp     verbs   efa     usnic   psm3
FI_EP_DGRAM     ✓       [:x:]   ✓       [:x:]   [:x:]   [:x:]
        ✓       *       ✓       ✓       ✓
FI_EP_MSG       ✓       ✓       [:x:]   [:x:]   [:x:]   [:x:]   ✓       [:x:]   ✓       [:x:]   [:x:]   [:x:]


Rxm will layer over verbs and tcp, but not gni.  Rxm layers over msg endpoints (this is what the 'm' stands for).
You should be able to test FI_COLLECTIVE over either of those two.


why not gni? it supports FI_EP_MSG doesn't it? How does one know if rxm is supported or not if we ignore the FI_EP_MSG entry?


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