A Fast GEMM Implementation on a Cypress GPU

by N.Nakasato (University of Aizu), submitted September 7, 2010. Accepted for presentation October 10, 2010.

We will present out results on this paper at 1st International Workshop on Performance Modeling, Benchmarking and Simulation of High Performance Computing Systems (PMBS 10) held as part of SC10, New Orleans, November 13-19, 2010.

PMBS 10 ​http://www.dcs.warwick.ac.uk/~sdh/pmbs10/pmbs10/Workshop_Home.html

abstract

We present benchmark results of optimized dense matrix multiplication kernels for a Cypress GPU. We write general matrix multiply (GEMM) kernels for single (SP), double (DP) and double-double (DDP) precision. Our SGEMM and DGEMM kernels show 73% and 87% of the theoretical performance of the GPU, respectively. Currently, our SGEMM and DGEMM kernels are fastest with one GPU chip to our knowledge. Furthermore, the performance of our matrix multiply kernel in DDP is 31 Gflop/s. This performance in DDP is more than 200 times faster than the performance in DDP on single core of a recent CPU (with mpack version 0.6.5). We describe our GEMM kernels with main focus on the SGEMM implementation since all GEMM kernels share common programming and optimization techniques. While a conventional wisdom of GPU programming recommends us to heavily use shared memory on GPUs, we show that texture cache is very effective on the Cypress architecture.

Sample program for DGEMM

​http://github.com/dadeba/dgemm_cypress/

preliminary results

• GEMM_Performance_Cypress
• MatrixMultiply

preprint

Posted later.