| Re: [eigen] Low performance in DEBUG mode |
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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Low performance in DEBUG mode
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Mon, 25 Oct 2010 08:22:09 -0400
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2010/10/25 Mathias Goldau <math@xxxxxxxxxxxxxxxxxxxxxxxxx>:
> Am 25.10.2010 13:22, Benoit Jacob wrote:
> [snip]
>
>>> The last third is specific to Eigen's unit tests. They enable special
>>> Eigen debugging code that makes them slower than regular debug mode
>>> (EIGEN_INTERNAL_DEBUGGING). Basically, every coefficient access, even
>>> internal ones, is checked to be in range (default debug mode skips
>>> that on eigen-internal coefficient addressing and only checks user
>>> addressing).
>>>
>>>> , is there a way
>>>> around to compile my unit tests also in debug mode, but with a bit more
>>>> performance in the end?
>>>> Even setting our cmake build type to: RelWithDebugInfo resulting effective in
>>>> those CXX flags: "-g -DDEBUG -O2" shows no improvement. I assume this depends
>>>> on the "-DDEBUG", am I right?
>>>
>>> No, -DDEBUG is just enabling regular assertions, that's not too slow.
>>>
>>> It's weird that RelWithDebInfo wasn't any faster for you. I checked
>>> the whole command line with VERBOSE=1 make, and it should really be
>>> optimized and fast:
>>>
>>> -g2 -O2 -g -O2 -g2
>>>
>>> (redundancy is no problem)
>>
>> Please try today's hg development branch with RelWithDebInfo. a Cmake
>> issue was recently fixed.
>
> Oh dear!, I tried it with new checkout from hg, but with no success since I've
> should checked earlier with VERBOSE=1! I typed: RelWithDebugInfo instead of
> RelWithDebInfo, now I've fast unittests with debug info :D, so thank you for
> your help and explanation from above.
ok, let me add back the cmake code checking the cmake build type, so
that in the future you get a good error message.
Benoit
>
> Mathias
>
> --
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> Universität Leipzig
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>