search

HiFiLES / HiFiLES-solver

High Fidelity Large Eddy Simulation Solver
Other
172 stars 131 forks source link

What is the benefit of using BLAS Lib in HiFiLES? #104

Closed popstar0426 closed 8 years ago

popstar0426 commented 8 years ago

Hi: I have a question of using BLAS lib in HiFiLES. What is the benefit of using BLAS Lib in HiFiLES? Will it speed the calculation? Or will it make the simulation more faster?

Best regards! Yue

JacobCrabill commented 8 years ago

BLAS (Basic Linear Algebra Subroutines) is a generic name for any of a number of libraries with similar/identical API calls. If you've never heard of BLAS before, I highly suggest you do a quick Google search to understand why it's so commonly used, and why it makes numerical linear-algebra routines so much faster. I would also recommend taking a basic class (or doing some reading) on computer architecture (specifically the CPU cache), as the performance you gain from using BLAS vs. a naive implementation of matrix-matrix / matrix-vector multiplications comes completely from writing code to use the underlying hardware in an intelligent way.