topic The USE MKL95_LAPACK in Intel® oneAPI Math Kernel Library

Using mkl with linux

Dmitriy_F_ — Fri, 22 Mar 2013 19:27:11 GMT

When i write ifort -mkl -c %fname% there's an error:

/tmp/ifortkyko2F.o: In function `MAIN__':
%fname%:(.text+0x1233): undefined reference to `sygst_'

mkl is installed and i used mklvars

You did not show any code, so

mecej4 — Fri, 22 Mar 2013 20:45:09 GMT

You did not show any code, so this is a guess: you probably forgot to add USE MKL95_LAPACK in the subprogram/main program from which sygst() is called, and did not tell the linker to search the appropriate Lapack95 library (depends on target architecture; see the MKL Link Line Adviser).

Quote:mecej4 wrote:

Dmitriy_F_ — Fri, 22 Mar 2013 21:06:32 GMT

mecej4 wrote:

you probably forgot to add USE MKL95_LAPACK

and did not tell the linker to search the appropriate Lapack95 library (depends on target architecture; see the MKL Link Line Adviser).

i didn't know about use, ty

MKL Link Line Adviser offers me use this:

$(MKLROOT)/lib/ia32/libmkl_lapack95.a -Wl,--start-group $(MKLROOT)/lib/ia32/libmkl_intel.a $(MKLROOT)/lib/ia32/libmkl_sequential.a $(MKLROOT)/lib/ia32/libmkl_core.a -Wl,--end-group -lpthread -lm

and i don't know how to use it( what should i run in terminal? sorry, i'm new in fortran and linux

The USE MKL95_LAPACK

mecej4 — Fri, 22 Mar 2013 21:59:56 GMT

The USE MKL95_LAPACK statement is needed because the generic subroutine name SYGST is called from your code, and the subroutine has optional arguments. The information in the module USEd is needed by the compiler to select the specific subroutine and to pass the arguments properly.

From a console window, with the Intel compiler and MKL environment properly set, you use the command

$ ifort <myprog.f90> <list of libraries given by link-line-adviser>

Note the blank space between the command and the first argument (the source file name) and another between the latter and the list of libraries.

i've tried

Dmitriy_F_ — Fri, 22 Mar 2013 22:17:00 GMT

i've tried

ifort curs1.f90 /opt/intel/composer_xe_2013.2.146/mkl/lib/ia32/libmkl_lapack95.a -Wl,--start-group /opt/intel/composer_xe_2013.2.146/mkl/lib/ia32/libmkl_intel.a /opt/intel/composer_xe_2013.2.146/mkl/lib/ia32/libmkl_sequential.a /opt/intel/composer_xe_2013.2.146/mkl/lib/ia32/libmkl_core.a -Wl,--end-group -lpthread -lm

with USE MKL95_LAPACK and got

error #7002: Error in opening the compiled module file. Check INCLUDE paths. [MKL95_LAPACK]
USE MKL95_LAPACK
----^
compilation aborted for curs1.f90 (code 1)

and then

ifort curs1.f90 -I /opt/intel/composer_xe_2013.2.146/mkl/include/ia32

with USE MKL95_LAPACK and got

/tmp/ifortNJbKDO.o: In function `MAIN__':
curs1.f90:(.text+0x270d): undefined reference to `dsygst_mkl95_'

Your first command line did

mecej4 — Fri, 22 Mar 2013 23:29:29 GMT

Your first command line did not work because the -I option was not given; the second failed since you did not specify the MKL libraries. Both are needed for the compilation and linking to succeed. We do not know which version of IFort and which version of MKL you have.

Try the following two alternatives:

1, To your first command line, add the -mkl option.

2, To your second command line, add the list of libraries given by the MKL link adviser.

the first alternative is

Dmitriy_F_ — Sat, 23 Mar 2013 13:01:03 GMT

the first alternative is working! thank you!