[Insight-users] ITK FFTW vs system FFTW

[Simon Rit]

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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