topic Re: MKL 10 fails the standard LAPACK tests in Intel® oneAPI Math Kernel Library

MKL 10 fails the standard LAPACK tests

celismr — Wed, 09 Apr 2008 22:52:40 GMT

When running the LAPACK tests that come with the reference LAPACK library from netlib with MKL 10 (10.0.1.14 and 10.0.2.18), the tests produce a segmentation fault.

The tests check the error exits, so they pass parameters to LAPACK routines that are not valid to see if the routine will identify an error. This seems to be causing the segmentation faults in the iterative refinement (e,g, DGERFS) and condition estimation (e.g. DGECON) LAPACK routines.

A segmentation fault also occurs if the routines like DGECON are called with N=0, which is a valid imput parameter.

When I change the input file for the tests so it does not run the error exit tests and all dimensions are greater than zero, then the tests pass successfully.

The system I am using is running Redhat 4 64-bit and has a dual core Pentium 2.80 GHZ processor. Tests are being compiled with Intel Fortran version 10.0.023 compilers. MKL libraries used in link line are -lmkl -lmkl_lapack -lguide -lpthread.

Any advice?

Re: MKL 10 fails the standard LAPACK tests

TimP — Thu, 10 Apr 2008 05:20:47 GMT

A minor nitpick: You shouldn't need to link libraries more than once, by using both the libmkl and the libmkl_lapack scripts. It shouldn't be harmful, given that it should make an MKL 9.1 link sequence work.
It seems that error handling should be consistent with reference lapack; if this interests you, file a problem report on premier.intel.com

Re: MKL 10 fails the standard LAPACK tests

Michael_C_Intel4 — Wed, 30 Apr 2008 13:35:57 GMT

There's an issue that some routines get seg.fault on non-positive inputparameters in LP64 model. It's going to be fixed soon.

Michael.

Re: MKL 10 fails the standard LAPACK tests

g_f_thomas — Wed, 30 Apr 2008 16:25:46 GMT

I know it's hardly a consolation but ditto for gerfs and gecon on Windows. Genuine Lapack 3 has been available since ca 2000 iirc so why hasn't Intel got its variant of it to perform without seg faults and access violations?

Gerry

Re: MKL 10 fails the standard LAPACK tests

Shane_S_Intel — Wed, 30 Apr 2008 16:46:38 GMT

Gerry,

I can assure you that the MKL team is working to address the issues reported and putting forth their best efforts to keep new issues from being introduced in the product.