Re: [Matlisp-commit] [matlisp-git]matlisp branch tensor updated. 2012-02-23-92-g0f1b57f

[Akshay S. <aks...@gm...>]

On 06/25/2012 03:51 PM, Akshay Srinivasan wrote:
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> commit 0f1b57f2c90f00aac4aa5ea6e7240ae69690409f
> Author: Akshay Srinivasan <aks...@gm...>
> Date:   Mon Jun 25 15:46:15 2012 +0530
> 
>     Added mod-loop for doing multi-index loops seemlessly. Must add more checks.
>     Added tensor-copy; can run things at about 3x BLAS (dcopy) speed (!) :)

Sorry the point about 3x BLAS speed is plainly wrong. It is about 3-4
times faster running on SBCL compared to fortran/C, when working with
*strided* tensors. Basically, I mean that multi-index loops in C are
much slower than on SBCL.

BLAS-dcopy is only useful for copying linearly ordered tensors, and is
about 10 times faster than using a multi-index loop in lisp; which is
hardly surprising.

Akshay