[Wien] fftw 3.3.10 cycle counter warning during configure

[Michael Fechtelkord]

Dear all,

when I configure fftw 3.3.10 using:

C=ifx F77=ifx CC=gcc CFLAGS="-O3 -march=native -mavx2" FCFLAGS="-O3 -xAVX2"\
   ./configure --prefix=/usr/local/ --enable-shared --enable-mpi 
--enable-openmp --enable-threads --enable-avx --enable-avx2


I get a warning from configure:


checking whether a cycle counter is available... no
***************************************************************
WARNING: No cycle counter found.  FFTW will use ESTIMATE mode
         for all plans.  See the manual for more information.
***************************************************************

I am using gcc 14.2, ifx 2025.0 on opensuse leap 15.6

I am not sure if I had this in older versions of gcc / ifort.

My question: Is the estimate mode a performance problem or can I just 
neglect the warning?


Best regards,

Michael


-- 
Dr. Michael Fechtelkord

Institut für Geologie, Mineralogie und Geophysik
Ruhr-Universität Bochum
Universitätsstr. 150
D-44780 Bochum

Phone: +49 (234) 32-24380
Fax:  +49 (234) 32-04380
Email:Michael.Fechtelkord at ruhr-uni-bochum.de
Web Page:https://www.ruhr-uni-bochum.de/kristallographie/kc/mitarbeiter/fechtelkord/ 
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