Fast read/write between networked computers via RDMA-based RPC requests

A system, comprising:

• a plurality of networked servers in communication via RDMA-enabled NICs, each networked server acting as either a sender or a receiver with respect to one or more of the other networked servers;
• an RDMA-based messaging API hosted on each server;
• applying the API of one of the servers acting as a sender to intercept an RPC request initiated by the sender;
• applying the API of the sender to direct a NIC of sender to transmit an RDMA read message to a NIC of one of the servers acting as a receiver, the RDMA read message configured to request control data comprising a list of free slots of an RDMA message buffer hosted on the receiver;
• applying the API of the sender to direct the NIC of sender to transmit an RDMA CAS message to the NIC of the receiver, the RDMA CAS message configured to reserve a selected one of the free slots of the RDMA message buffer of the receiver;
• applying the API of the sender to direct the NIC of sender to transmit an RDMA write message to the NIC of the receiver, the RDMA write message configured to write the RPC request to the reserved slot of the RDMA message buffer;
• and
• applying the API of the receiver to execute the RPC request on the receiver.

A computer-readable storage device having computer executable instructions stored therein, said instructions causing a computing device to execute a method comprising:

• receiving a request from a process executing on a sender to transmit an RPC request to a receiver for execution;
• transmitting a reservation request from a NIC of the sender to a NIC of the receiver to reserve a particular free slot of an RDMA message buffer hosted on the receiver via an RDMA CAS message;
• transmitting the RPC request from the NIC of the sender to the reserved slot of the RDMA message buffer via an RDMA write message to the NIC of the receiver;
• and
• applying a thread executing on the receiver to pull the RPC request from the RDMA message buffer and pass that RPC request to be executed on the receiver.