Overlapped rendezvous memory registration

A non-transient machine-readable media having instruction stored thereon, including instructions configured to be executed via first and second processes, the first process corresponding to a sender and the second process corresponding to a receiver, wherein execution of the instructions enable the first and second processes to:

• send a PUT request message from a sender to a receiver, the PUT request message including first and second match indicia and including payload data that is stored in a send buffer on the sender;
• subsequent to initiating sending of the PUT request message, initiate exposing the send buffer;
• determine, at the receiver and via use of the first match indicia, whether the PUT request is expected or unexpected;
• and
• when the message is unexpected,
• drop the payload data included in the PUT request message;
• initiate a remote memory access (RMA) GET from the receiver, the RMA GET including a GET request message sent from the receiver to the sender including the second match indicia;
• and
• return the payload data in the send buffer from the sender to the receiver using an RMA operation, wherein the send buffer is identified via use of the second match indicia.

A system comprising a plurality of nodes, each executing a respective process enabling each node to operate as a sender and receiver, wherein under a given data transfer from a first node to a second node the first node comprises a sender and the second node comprises a receiver, and the given data transfer comprises:

• sending a PUT request message from a sender to a receiver, the PUT request message including first and second match indicia and including payload data that is stored in a send buffer on the sender;
• after sending the PUT request message, initiating exposing the send buffer;
• determining, at the receiver and via use of the first match indicia, whether the PUT request is expected or unexpected;
• and
• when the message is unexpected,
• dropping the payload data included in the PUT request message;
• initiating a remote memory access (RMA) GET from the receiver, the RMA GET including a GET request message sent from the receiver to the sender including the second match indicia;
• and
• returning the payload data in the send buffer from the sender to the receiver using an RMA operation, wherein the send buffer is identified via use of the second match indicia.