| Message passing based MPP is now the mainstream of the supercomputing market. Low communication overhead and the overlap of communications and computations are key to make better use of the computing capability of current MPPs.In this paper, performance of the NX message passing software currently running on the Dawning 1000 is analyzed. It is showed that the complex buffer management policy and slow memory copy used are the most important reasons of the poor performance of NX. To provide better communication performance, a much more efficient yet simple message passing software, DAM, is designed and implemented on the Dawn 1000, based on the Active Message mechanism. And a magnitude of performance gain is achieved. |
PDF Full Text Request