Patent ID: 8332460

Claim:
A method of performing a local reduction operation on a parallel computer, the parallel computer comprising a plurality of compute nodes coupled for data communications with a high speed, low latency network, the compute nodes organized for collective operations, each compute node comprising at least four processing cores, each processing core assigned an input buffer, the at least four processing cores including two reduction processing cores dedicated to executing reduction operations, a network write processing core dedicated to writing results of reduction operations to the network, and a network read processing core dedicated to receiving data from the network, the method comprising: copying, in interleaved chunks by the reduction processing cores, contents of the reduction processing cores' input buffers to an interleaved buffer in shared memory; copying, by one of the reduction processing cores, contents of the network write processing core's input buffer to shared memory; copying, by another of the reduction processing cores, contents of the network read processing core's input buffer to shared memory; and locally reducing in parallel by the reduction processing cores: the contents of the reduction processing cores' input buffers; every other interleaved chunk of the interleaved buffer; the copied contents of the network write processing core's input buffer; and the copied contents of the network read processing core's input buffer.