BLACS -- Advanced Topics

• The BLACS provide “globally-blocking” point-to-point receive, broadcasts and combines. The BLACS point-to-point send is “locally-blocking”.

  • Globally blocking: The return from the operation implies that the buffer is available for re-use. The operation may not complete unless the complement of the operation is called.
  • Locally blocking: The return from the send implies that the buffer is available for re-use. The send will complete regardless of whether the corresponding receive is posted.

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