Re: [eigen] Propagating Max*AtCompileTime template parameters to decomp

On Thu, Mar 4, 2010 at 6:00 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx> wrote:

Supreme refinement is to add a unit test for that. We already have the
skeleton in the nomalloc test (test/nomalloc.cpp). Indeed, when
EIGEN_NO_MALLOC is defined, any heap allocation will cause an assert
failure, which in the context of unit tests we convert into an
exception.

So don't hesitate to expand the nomalloc.cpp test, just with new
executable targets (CALL_SUBTEST_x for a new value of x up to 16) so
that no single executable gets too big. Testing only 'float' is good
enough.

I was just thinking of that. I'll try to squeeze some time for that, too ;). Thanks for pointing me to the skeleton, that will speed up things. Should EIGEN_STACK_ALLOCATION_LIMIT 0 be defined as well, or am I good to go with only EIGEN_NO_MALLOC?. The tests I've been playing with were triggering assertions made by EIGEN_NO_MALLOC only.

Benoit

2010/3/4 Benoit Jacob <jacob..benoit.1@xxxxxxxxx>:

> 2010/3/4 Adolfo Rodríguez Tsouroukdissian <dofo79@xxxxxxxxx>:
>>
>>
>> On Thu, Mar 4, 2010 at 5:25 PM, Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
>> wrote:
>>>
>>> Hi Adolfo,
>>>
>>> Many thanks for this patch. It's been sitting in the back of my mind
>>> nagging me for a while :) These fixes are definitely wanted.
>>>
>>> Just 2 things:
>>>
>>> 1. All the MatrixType:: is a bit heavy so could you please introduce
>>> enums like is being done in ColPivHouseholderQR.h, in other
>>> decompositions? So MatrixType::MaxBlabla becomes just MaxBlaBla.
>>
>> OK, no problem. The enum approach is definitely much cleaner. I just didn't
>> want to impose it if it was not used in some files :)
>>
>> One more thing, now that I'm on it, are there any other files that I might
>> have overlooked that could benefit from similar changes?
>
> Any decomposition is affected in the same way. Have you had a look at
> the Eigenvalues directory?
>
>
>>
>>>
>>> 2. You generated this patch with "diff" so it doesn't credit you, and
>>> you haven't written your commit msg. Could you please follow the
>>> instructions given there:
>>>
>>> http://eigen.tuxfamily..org/index.php?title=Developer%27s_Corner#Generating_a_patch
>>>
>>
>> Ack.
>>
>> Adolfo
>>
>>>
>>> Yes, this mailing list is the right place for such patches... the
>>> issue tracker is useful to report bugs without being immediately able
>>> to fix them.
>>>
>>> Benoit
>>>
>>>
>>> 2010/3/4 Adolfo Rodríguez Tsouroukdissian <dofo79@xxxxxxxxx>:
>>> > Hi all,
>>> >
>>> > I've been performing some tests with dynamic matrices that have a
>>> > compile-time max size, and found out that for most matrix
>>> > decompositions,
>>> > the MaxRowsAtCompileTime and MaxColsAtCompileTime template parameters of
>>> > the
>>> > input matrix are not propagated to the decomposition's members and
>>> > temporaries. This leads to undesired and preventable heap allocations.
>>> > The
>>> > following is a minimal example of what I mean:
>>> >
>>> > typedef Matrix<double, dynamic, dynamic, 0, 10, 10> Mat;
>>> > Mat A(Mat::Random(5, 5));
>>> >
>>> > FullPivLU<Mat> ldlt(A); // Allocates 4 temps
>>> > LDLT<Mat> ldlt(A); // Allocates 3 temps
>>> >
>>> > I'm attaching a patch against the devel branch (commit
>>> > 2589:8a8f4e9e04bf)
>>> > that deals with this issue for the Cholesky, LU, QR and SVD modules.
>>> > Since
>>> > most of these modules are experimental and undergoing heavy work, the
>>> > style
>>> > of the modifications changes form file to file (some use convenience
>>> > enums,
>>> > some not). However, I tried to stay consistent within the context of
>>> > each
>>> > file. Please let me know your thoughts on the matter.
>>>
>>> Yes so actually, please introduce enums everywhere :)
>>>
>>> > One very specific
>>> > note: in line 65 of HouseHolderQR.h I left the Options template
>>> > parameter
>>> > as-is, but don't know if it should be changed to that of MatrixType.
>>>
>>> Great catch! Please change that to Options (as defined on line 57).
>>>
>>> Thanks
>>> Benoit
>>>
>>> >
>>> > Cheers,
>>> >
>>> > Adolfo.
>>> >
>>> > P.S. Is there a better way to submit small patches, something like a
>>> > bugtracker, or is this the currently recommended way?
>>> >
>>> > --
>>> > 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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>>
>>
>