| Re: [eigen] Slow matrix-matrix multiply |
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- To: eigen <eigen@xxxxxxxxxxxxxxxxxxx>
- Subject: Re: [eigen] Slow matrix-matrix multiply
- From: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>
- Date: Mon, 8 Apr 2013 13:21:32 +0200
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Hi,
On Thu, Apr 4, 2013 at 1:13 AM, Sameer Agarwal <sameeragarwal@xxxxxxxxxx> wrote:
> The thing which is common to all the problems above is that the matrices in
> question are all statically sized. Another problem we are interested in
> involves semi-statically sized matrices, and there the performance
> improvements are much more dramatic.
>
> 8. 8 Cameras 1 Shared calibration 2190 points
> old-eigen new-eigen new-blas
> gcc 0.17 0.15 0.04
> clang 0.16 0.13 0.03
>
> In summary, for fixed sized matrices Clang and Eigen have some talking to
> do. For dynamic/semi-static matrices it seems (based on one example) for
> both GCC and Clang custom routines beat Eigen.
This last example is more interesting, and something we expected. How
can I reproduce it?
gael