How to use Intel fortran compiler with MKL at command line
I recently installed Intel® Parallel Studio XE Composer Edition for Fortran OS X * (Student Edition). It comes with the Math Kernel library, so I bought it. I find it difficult to get started with MKL. Here's what I did step by step.
1) Installed Intel® Parallel Studio XE Composer Edition for Fortran OS X * (no problem). I can run the "hello world" script with ifort
and drop the link command -mkl
at the end without issue (without calling any mkl commands yet).
2) Following these instructions, I set the environment variables using the script provided by intel (located at opt / intel / bin to be exact). I have Intel 64-bit architecture (as per ifort -V
) so I am using bash mklvars.sh intel64 mod ilp64
. It works without error (or any output).
3) I am writing the following code to use the MKL gemm command for fortran95. By simply multiplying 2 matrices.
program test
implicit none
real, dimension(2,2) :: testA, testB, testC
testA = 1
testB = 1
testC = 0 ! I don't think I need this line, but it shouldn't matter
call gemm(testA, testB, testC)
write(*,*) testC
end program test
4) I will compile ifort test_mkl.f90 -o test -mkl
. I am getting the following error:
Undefined symbols for architecture x86_64:
"_gemm_", referenced from:
_MAIN__ in ifortSTVOrB.o
ld: symbol(s) not found for architecture x86_64
5) I try ifort test_mkl.f90 -o test -L/opt/intel/mkl/lib -mkl
and get the same result.
I notice that a lot of people using MKL start their code with USE mkl95_blas, ONLY: gemm
, so I put that above implicit none
in both of the examples above and get:
test_mkl.f90(4): error #7002: Error in opening the compiled module file. Check INCLUDE paths. [MKL95_BLAS]
USE mkl95_blas, ONLY: gemm
--------^
test_mkl.f90(12): error #6406: Conflicting attributes or multiple declaration of name. [GEMM]
call gemm(testA, testB, testC )
---------^
test_mkl.f90(4): error #6580: Name in only-list does not exist. [GEMM]
USE mkl95_blas, ONLY: gemm
--------------------------^
compilation aborted for test_mkl.f90 (code 1)
Any ideas as to what the problem is or how to fix it? I have successfully run a simple script in XCODE using MKL, so this is definitely what I am doing and not my installation.
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The documentation states that you use the "source" command on the provided compilervars.sh script to make all the resources available. For example:
source // bin / compilervars.sh
This will add MKL to the include and library paths so that the compiler and linker can find them. If you need more help, please refer to https://software.intel.com/en-us/forums/intel-fortran-compiler-for-linux-and-mac-os-x . You can get special help for MKL at https://software.intel.com/en-us/forums/intel-math-kernel-library
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