Hi, all!

I want using ACML-GPU lib and HD4870x2 graphical card to run high-performance linpack.

when NB<=478, ||Ax-b||_oo/(eps*(||A||_oo*||x||_oo+||b||_oo)*N) will be equal to zero, this calculation is passed.

but when N>1000 and NB>478, ||Ax-b||_oo/(eps*(||A||_oo*||x||_oo+||b||_oo)*N) will not be equal to zero, the result is wrong, the calculation is failed!

I want to know why NB cant greater than 458, and how can I increase my linpack benchmark score.

The 1.1 version of ACML-GPU has a bug that causes this problem. We have resolved the bug and released as 1.1.1. Please try this new version, it was released specifically for this problem.

Using the new version and a 5870 card, best results were obtained with N=22000, and NB=2560. This system has 8GB of memory.