| 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 10:27:41 -0400
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2010/10/25 Mathias Goldau <math@xxxxxxxxxxxxxxxxxxxxxxxxx>:
> Am 25.10.2010 14:22, Benoit Jacob wrote:
>> 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.
>
> I am not 100 percent sure, the cmake build type stuff was not related to
> CMakeLists.txt of Eigen, it was more a problem with our CMakeLists.txt, so
> probably WE should (also) add a check in our CMakeLists.txt, incase of an
> unkown build type => Message( WARNING "Your using an unknown build type" ) or
> something similar.
>
> Do you mean the CMakeLists.txt change with case insensitivity of Debug =>
> debug? I think this is not related to my source of error.
that's pushed now; i meant that we're now erroring out when you make a
typo in the build type.
the cmake build type is case insensitive so our check is.
Benoit
>
> Mathias
>
> --
> Institut für Informatik
> Universität Leipzig
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>
>