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From Ted Dunning <>
Subject Re: Current state of (dense) matrix multiplication?
Date Mon, 12 Apr 2010 03:53:29 GMT

We don't have any distributed dense multiplication operations because we
have not yet found much application demand for distributed dense matrix
multiplication.  Distributed sparse matrix operations are a big deal,

If you are interested in working on the problem in the context of Mahout, we
would love to help.  This is especially true if you have an application that
needs dense operations and could benefit from some of the other capabilities
in Mahout.

On Sun, Apr 11, 2010 at 1:27 PM, Vimal Mathew <> wrote:

> Hi,
>  What's the current state of matrix-matrix multiplication in Mahout?
> Are there any performance results available for large matrices?
>  I have been working on a Hadoop-compatible distributed storage for
> matrices. I can currently multiply two 40K x 40K dense double
> precision matrices in around 1 hour using 34 systems (16GB RAM, two
> Core2Quads' per node). I was wondering how this compares with Mahout.
> Regards,
>  Vimal

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