Required and optional features to support the ch4 ofi netmod

required capabilities

• FI_EP_RDM
• FI_THREAD_DOMAIN
  • MPICH serializes all access libfabric. Stronger thread guarantees will work, but may cause performance loss.
• FI_MSG
• FI_MULTIRECV
• FI_READ (for large message rndv)
  • planned to make optional
• FI_TAGGED (for dynamic process support)
  • planned to make optional
• iov_limit >= 4

optional capabilities

• for tagged send/recv
  • FI_TAGGED + FI_DIRECTED_RECV + FI_REMOTE_CQ_DATA >= 4 bytes
• for rma
  • FI_RMA + FI_READ + FI_WRITE + FI_REMOTE_READ + FI_REMOTE_WRITE
• for atomics
  • FI_ATOMICS

ch4 supports all of the following modes

• memory registration
  • FI_MR_BASIC
  • FI_MR_SCALABLE
• auto progress
  • FI_PROGRESS_AUTO
  • FI_PROGRESS_MANUAL
• endpoint creation
  • fi_endpoint()
  • fi_scalable_ep()