[SciPy-dev] sparse matrix multiplication - poor performance
oliphant at ee.byu.edu
Thu Dec 7 16:35:33 CST 2006
Nathan Bell wrote:
>On 12/7/06, Nathan Bell <wnbell at gmail.com> wrote:
>On 12/7/06, Joachim Dahl <dahl.joachim at gmail.com> wrote:
>> yes, this happens consistently for me with Matlab 220.127.116.114 on a Linux P4
>I suggest you ask for your money back then :) That should always be
>an O(N) operation, no matter how convoluted the sparse storage format.
>Anyway I've done some digging and I think the following are true:
> SPARSKIT is not actually used, although it is mentioned
> sparsetools is what actually computes the matrix matrix products
> sparsetools does an O(N^2) (in time) operation for sparse matrix multiplies
>I don't know Fortran so I can't say the last for certain. My timing
>results certainly suggest sub-optimal complexity.
>Can anyone confirm this? Should we look to alternatives such as
>SPARSKIT  or SMMP and the like? SPARSKIT seems to provide a
>number of important utility routines that are also currently slow
>(e.g. sparse matrix format conversions).
The licensing for SPARSKIT is (was) not suitable for use in SciPy. I
have used it in the past but couldn't because of licensing issues.
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