Optimization of BLAS for Loongson-3A Architecture
Yanjun Liu · Journal of Chinese Computer Systems · 2012
General matrix multiplication of double precision(DGEMM) is one of the most important functions in BLAS library,which is called by many functions in the level-3 BLAS.The theoretical analyses help us find out the best way for loop unrolling contraposing 128-bit memory access instructions of Loongson-3A.By means of address interleaving,cache conflict misses are reduced according to the random cache replacement policy.Considering the limited memory bandwidth of Loongson-3A,task classification on the basis of data sharing is adopted to reduce the data access.The computation speed of the optimized DGEMM on single-core and multi-core is more than twice that of the open source BLAS library of highest performance.