Cluster FFT - undefined reference

[sanjap]

Hi, this is driving me crazy:
Assembled the simplest application just to test FFT on cluster (Linux SUSE 10.0). Could not compile it, always undefined reference just to specific Cluster FFT functions. Regular (non-cluster) FFT works just fine, but I wanted to try running it in parallel on our new cluster,a nd besides this is just a testbed for redesigning some larger project with mkl. Please help.

(Intel compiler 10.1.08, mkl: tried both 10.0.08 and 10.1.1.019, the same behaviour)
Bellow: Source code, command line, compiler/linker error.

--SOURCE------------------------------
include "mkl_cdft.f90"

program ff

Use MKL_CDFT
include "mpif.h"

Complex :: X(64)
type(DFTI_DESCRIPTOR_DM), POINTER :: My_Desc1_Handle
Integer :: Status, j
real :: rx
integer IERROR

call MPI_INIT(IERROR)

!Some simple input array
do j=1,64
rx = -10. +(j-1)*20./63.
x(j) = cmplx(exp(-(rx**2)/2.),0.)
end do

! Perform a complex to complex transform
Status = DftiCreateDescriptorDM(MPI_COMM_WORLD, My_Desc1_Handle, DFTI_SINGLE, DFTI_COMPLEX, 1, 64)
Status = DftiCommitDescriptorDM( My_Desc1_Handle )
Status = DftiComputeForwardDM( My_Desc1_Handle, X )
Status = DftiFreeDescriptorDM(My_Desc1_Handle)

call MPI_FINALIZE(IERROR)

end program ff

--COMPILER COMM. LINE--------------

ifort -O -mcmodel=large -i8 -lmkl_cdft_core -lmpi cfft.f90 -o cfft.exe

--COMPILER ERROR--------------------
/tmp/ifortVZq4Fs.o: In function `MAIN__':
cfft.f90:(.text+0x136): undefined reference to `DftiCreateDescriptorDM1_fortran'
cfft.f90:(.text+0x152): undefined reference to `DftiCommitDescriptorDM_fortran'
cfft.f90:(.text+0x177): undefined reference to `DftiComputeForwardDMi_fortran'
cfft.f90:(.text+0x18f): undefined reference to `DftiFreeDescriptorDM_fortran'
/tmp/ifortVZq4Fs.o: In function `mkl_cdft_mp_dfticreatedescriptordmn_d_':
cfft.f90:(.text+0x1cd): undefined reference to `DftiCreateDescriptorDMn_fortran'
/tmp/ifortVZq4Fs.o: In function `mkl_cdft_mp_dfticreatedescriptordmn_s_':
cfft.f90:(.text+0x1ed): undefined reference to `DftiCreateDescriptorDMn_fortran'
/tmp/ifortVZq4Fs.o: In function `mkl_cdft_mp_dfticreatedescriptordm1_d_':
cfft.f90:(.text+0x210): undefined reference to `DftiCreateDescriptorDM1_fortran'
/tmp/ifortVZq4Fs.o: In function `mkl_cdft_mp_dfticreatedescriptordm1_s_':
cfft.f90:(.text+0x234): undefined reference to `DftiCreateDescriptorDM1_fortran'
-------------------------------------

[Dmitry_B_Intel]

Hi sanjap,

Please refer to MKL User's Guide for correct linking lines, specifically the section "Working with Intel Math Kernel Library Cluster Software." Perhaps, the following line will do what you need:

ifort-O -mcmodel=large -i8 cfft.f90 -o cfft.exe -lmkl_cdft_core -lmkl_blacs_intelmpi_ilp64 -lmkl_intel_ilp64 -lmkl_sequential -lmkl_core -lmpi

Dima

[sanjap]

Hi,
I have already tried all the libraries mentioned in User's Guide - Working with cluster ..., butno progress.Also, when listing library contents with nm,specific cluster fft functions (for example DftiCreateDescriptorDM) are shown in libmkl_cdft_core.a, but I could not link it in, even if forcing static linking.
Perhaps I'm overseeing something wrong in program...?
Thanks anyway

[Vladimir_Petrov__Int]

Hi,

Thank you for your interest in our Cluster FFT library. The symbols like DftiCreateDescriptorDM1_fortran represent the FORTRAN interface for CFFT and have to be resolved from one of the interface libraries libmkl_intel_lp64.a or libmkl_intel_ilp64.a depending on your needs. In general (according to the User's Guide) the link line should look like:

ifort myprog.f -L$MKLPATH -I$MKLINCLUDE -Wl,--start-group $MKLPATH/libmkl_intel_lp64.a $MKLPATH/libmkl_intel_thread.a $MKLPATH/libmkl_core.a $MKLPATH/libmkl_cdft_core.a -Wl,--end-group -liomp5 -lpthread

But the best starting point to learn how to work with MKL is the examples directory (examples/cdftf in this case). In particular using compiler wrappers provided by MPI could save some time figuring out which MPI libraries to link with.

Hope this helps,
-Vladimir