| -sf_type | - implementation type, see PetscSFSetType()
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| -sf_rank_order | - sort composite points for gathers and scatters in rank order, gathers are non-deterministic otherwise
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| -sf_use_default_stream | - Assume callers of SF computed the input root/leafdata with the default cuda stream. SF will also
use the default stream to process data. Therefore, no stream synchronization is needed between SF and its caller (default: true).
If true, this option only works with -use_cuda_aware_mpi 1.
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| -sf_use_stream_aware_mpi | - Assume the underlying MPI is cuda-stream aware and SF won't sync streams for send/recv buffers passed to MPI (default: false).
If true, this option only works with -use_cuda_aware_mpi 1.
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