Hajime Fujita comments

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                                            Hajime Fujita

bug: ch4/ofi/psm2: poor put/get performance when both origin and target datatypes are noncontig

Tagging @shawnccx @nusislam

bug: ch4 memory corruption in MPI_Datatype management exposed by GA

@pkcoff Thank you for reporting. @raffenet can you assign this to me? @mblockso you might want to jump in too because I think you saw another crash here before.

bug: ch4 memory corruption in MPI_Datatype management exposed by GA

@pkcoff I'm not sure if this is still an issue, but our recent patches #2876 completely rewrote the RMA datatype handling (`MPIDI_OFI_win_datatype_unmap` no longer exists, for example), so it may...