[Insight-users] ITK FFTW vs system FFTW

[Bradley Lowekamp]

Looking at the cmake build scripts:

https://github.com/Kitware/ITK/blob/master/CMake/itkExternal_FFTW.cmake#L44

It looks like CMAKE_C_FLAGS_RELEASE is not getting passed.

I'll see if I can take this on after lunch.

Brad

On Apr 12, 2013, at 11:30 AM, Simon Rit <simon.rit at creatis.insa-lyon.fr> wrote:

> I'm not sure it's the reason: I don't expect a two fold improvement
> and the system has the same version installed, 3.3.2. Are we sure that
> the release flags are passed to FFTW? When I looked at the compilation
> log, I don't see -O3, here is an excerpt:
> 
> /bin/sh ../libtool --tag=CC   --mode=compile /usr/bin/cc -std=gnu99
> -DHAVE_CONFIG_H -I.
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel -I..
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/simd
> -Wno-uninitialized -Wno-unused-parameter -Wall -Wcast-align
> -Wdisabled-optimization -Wextra -Wformat=2 -Winvalid-pch
> -Wno-format-nonliteral -Wpointer-arith -Wshadow -Wunused
> -Wwrite-strings -funit-at-a-time -Wno-strict-overflow  -MT
> cpy2d-pair.lo -MD -MP -MF .deps/cpy2d-pair.Tpo -c -o cpy2d-pair.lo
> /home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel/cpy2d-pair.c
> libtool: compile:  /usr/bin/cc -std=gnu99 -DHAVE_CONFIG_H -I.
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel -I..
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/simd -Wno-uninitialized
> -Wno-unused-parameter -Wall -Wcast-align -Wdisabled-optimization
> -Wextra -Wformat=2 -Winvalid-pch -Wno-format-nonliteral
> -Wpointer-arith -Wshadow -Wunused -Wwrite-strings -funit-at-a-time
> -Wno-strict-overflow -MT cpy2d-pair.lo -MD -MP -MF
> .deps/cpy2d-pair.Tpo -c
> /home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel/cpy2d-pair.c -o
> cpy2d-pair.o
> mv -f .deps/cpy2d-pair.Tpo .deps/cpy2d-pair.Plo
> /bin/sh ../libtool --tag=CC   --mode=compile /usr/bin/cc -std=gnu99
> -DHAVE_CONFIG_H -I.
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel -I..
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/simd
> -Wno-uninitialized -Wno-unused-parameter -Wall -Wcast-align
> -Wdisabled-optimization -Wextra -Wformat=2 -Winvalid-pch
> -Wno-format-nonliteral -Wpointer-arith -Wshadow -Wunused
> -Wwrite-strings -funit-at-a-time -Wno-strict-overflow  -MT cpy2d.lo
> -MD -MP -MF .deps/cpy2d.Tpo -c -o cpy2d.lo
> /home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel/cpy2d.c
> libtool: compile:  /usr/bin/cc -std=gnu99 -DHAVE_CONFIG_H -I.
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel -I..
> -I/home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/simd -Wno-uninitialized
> -Wno-unused-parameter -Wall -Wcast-align -Wdisabled-optimization
> -Wextra -Wformat=2 -Winvalid-pch -Wno-format-nonliteral
> -Wpointer-arith -Wshadow -Wunused -Wwrite-strings -funit-at-a-time
> -Wno-strict-overflow -MT cpy2d.lo -MD -MP -MF .deps/cpy2d.Tpo -c
> /home/srit/src/itk4/lin64-dg/fftwd/src/fftwd/kernel/cpy2d.c -o cpy2d.o
> mv -f .deps/cpy2d.Tpo .deps/cpy2d.Plo
> 
> 
> On Fri, Apr 12, 2013 at 5:21 PM, Bill Lorensen <bill.lorensen at gmail.com> wrote:
>> Looks like the fftw folks have made some efficiency improvements.
>> 
>> 
>> 
>> On Fri, Apr 12, 2013 at 11:18 AM, Simon Rit <simon.rit at creatis.insa-lyon.fr>
>> wrote:
>>> 
>>> I should have mentioned it: yes, it is!
>>> 
>>> On Fri, Apr 12, 2013 at 5:16 PM, Bill Lorensen <bill.lorensen at gmail.com>
>>> wrote:
>>>> Is your ITK built Release?
>>>> 
>>>> 
>>>> 
>>>> On Fri, Apr 12, 2013 at 11:13 AM, Simon Rit
>>>> <simon.rit at creatis.insa-lyon.fr>
>>>> wrote:
>>>>> 
>>>>> Hi,
>>>>> We have recently observed on a fedora distribution that FFTW is two
>>>>> times slower when one uses the ITK compilation
>>>>> (USE_SYSTEM_FFTW:BOOL=OFF, default) than when one uses the system fftw
>>>>> (USE_SYSTEM_FFTW:BOOL=ON).
>>>>> 
>>>>> We have looked for an explanation in the flags (the Fedora flags are
>>>>> available here
>>>>> http://pkgs.fedoraproject.org/cgit/fftw.git/tree/fftw.spec)
>>>>> but we have not managed to figure it out. Would someone happen to have
>>>>> an explanation and solution?
>>>>> 
>>>>> Thanks in advance,
>>>>> Simon
>>>>> _____________________________________
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>>>> 
>>>> 
>>>> 
>>>> --
>>>> Unpaid intern in BillsBasement at noware dot com
>> 
>> 
>> 
>> 
>> --
>> Unpaid intern in BillsBasement at noware dot com
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