On May 14, 2012, at 2:16 AM, Andreas Schäfer wrote:
> Not much more surprising than an array allocated by malloc() not being
> automatically deallocated once the pointer dies. The datatype variable
> is merely a handle, Open MPI has an internal data store for each
> user-defines datatype. Same for requests AFAIK.
More specifically: the MPI standard defines the behavior this way. It's not an Open MPI-specific artifact.
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