Re: EPICS shared library performance

["Konrad, Martin via Core-talk" <core-talk at aps.anl.gov>]

Hi Mark,
> However, the really good news is that when I build with the 3.3.2 
> dynamic version of libfftw3f.so the new build is actually ~20%
> faster than the old static build.  So now I am happy, I have gained
> performance rather than lost performance when rebuilding.
Good to hear. If performance matters try building FFTW with

-O3 -march=native -mtune=native -mavx (Sandy Bridge and higher) -mavx2
(Haswell and higher)

You might need to configure FFTW with --enable-avx2. Sounds like you
have a state-of-the-art CPU and with FFTW >=3.3 you might actually be
able to leverage some of its features. BTW: FFTW 3.3.2 is more than 8
years old - there's a good chance newer versions will perform better on
modern hardware.

-Martin

-- 
Martin Konrad
Facility for Rare Isotope Beams
Michigan State University
640 South Shaw Lane
East Lansing, MI 48824-1321, USA
Tel. 517-908-7253
Email: konrad at frib.msu.edu