Re: [eigen] Allocation policy of eigen decompositions

[Benoit Jacob <jacob.benoit.1@xxxxxxxxx>]

Sorry, my bad! I added this eval() for debugging and forgot to remove it.

Can you retry now? This should remove 1 heap allocation. I really
don't know where the 3 others can be coming from, but that would be a
bug that we (I...) introduced, so you don't have to block your stuff
because of it.

Benoit


2010/4/19 Adolfo Rodríguez Tsouroukdissian <adolfo.rodriguez@xxxxxxxxxxxxxxxxx>:
> Some updates,
>
> The patch is coming out quite well, but there is something that I'd like to
> ask the devs about firs. Up until this morning I had all decompositions
> except those in the Eigenvalues module (will talk about that in a separate
> email) working as expected, then I pulled in recent changes (storageorders
> branch included) and something changed in the behavior of the
> applyHouseholderOnTheLeft method of MatrixBase<Derived>.
>
> Line 101 of Householder/HouseHolder.h states:
>
> tmp.noalias() = essential.adjoint().eval() * bottom;
>                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> When using dynamic matrices, the highlighted part performs four heap
> allocations, and since all QR decompositions use applyHouseholderOnTheLeft,
> their compute() method ends up heap-allocating as well, which is what I'm
> trying to avoid. My question is then, can these allocations be prevented?,
> and if so what would be the best way?. I would also appreciate some insight
> into why these heap allocations weren't occurring before.
>
> Thanks in advance,
>
> Adolfo
>
>
> --
> Adolfo Rodríguez Tsouroukdissian, Ph. D.
>
> Robotics engineer
> PAL ROBOTICS S.L
> http://www.pal-robotics.com
> Tel. +34.93.414.53.47
> Fax.+34.93.209.11.09
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