[mpich-discuss] non-blocking communication and subarray data type

[burlen]

Can anyone clarify about using subarray datatype with irecv, When is ok 
to free the subarray data type? Can I do so immediately after calling 
irecv? or must I wait until the recv really finishes? I didn't see any 
specific language about this in the documentation , but I'm experiencing 
segfaults when MPI accesses previously free'd memory in the datatype.

Thanks
Burlen