Hi Burlen, You can free the datatype as soon as you are finished using it. MPI will internally maintain a reference to the datatype so that it is not actually freed until both the MPI library and the application code are finished using it. ~Jim. On 4/22/13 4:29 PM, burlen wrote:

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 _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss