Patent ID: 9081739
Filing Date: 2015-07-14
Classification: G06F,H04L

Abstract:
1. A method for fencing direct memory access (DMA) data transfers in a parallel active messaging interface (‘PAMI’), the method comprising: receiving, at an origin endpoint in the PAMI, a DMA PUT instruction from an origin application, wherein the DMA PUT instruction specifies a data transfer between the origin endpoint to a target endpoint in the PAMI, wherein the DMA PUT instruction, upon execution, transmits data from the origin endpoint directly into a target random access memory (RAM) for the target endpoint, wherein each endpoint specifies a client, a context, and a task; receiving, at an origin endpoint, a FENCE instruction corresponding to data transfer between the origin endpoint and the target endpoint, wherein the FENCE instruction advises the application when the transfers between the origin endpoint and the target endpoint are complete, and wherein the transfer between the origin endpoint and the target endpoint occur across a deterministic network connecting the origin endpoint and the target endpoint; posting the DMA PUT instructions and the FENCE instruction to a work queue of the context for the origin endpoint, wherein the FENCE instruction is posted at a location in the ordered sequence such that the FENCE instruction is processed after the plurality of DMA PUT instructions is processed; and executing, through the PAMI, by the origin endpoint, an advance function that executes instructions in the work queue strictly in the ordered sequence, wherein execution of the FENCE instruction indicates to the origin application that the execution of the DMA PUT instruction is complete.