topic Re: Technical question - crash using MKL functions in Intel® oneAPI Math Kernel Library

Technical question - crash using MKL functions

lsheva — Sun, 10 Feb 2008 15:53:53 GMT

Hello,

I am trying to run my tester, which tests a dll using MKL libraries.

It works great on release mode, but on debug mode it crashes and screams Access Violation.

This is my call stack, if it can help in any way:

MyTester.exe!_mkl_blas_p4m_dgcopyan() + 0x15b bytesFortran
MyTester.exe!_mkl_blas_p4m_xdgemm() + 0x32a bytesC
MyTester.exe!_mkl_blas_p4m_dgemm() + 0xb89 bytesC
MyTester.exe!_mkl_blas_p4m_dtrsm() + 0x7ff bytesC
MyTester.exe!_mkl_blas_dgemm() + 0x56 bytesC

I would like to know if you have any idea what might cause it.

Maybe something in my configurations isnt set right.

I am using libguide40.lib, MKL 9.0

Thank you in advance,

Liad.

Re: Technical question - crash using MKL functions

TimP — Sun, 10 Feb 2008 16:44:28 GMT

Among the possibilities are that the data arrays you supply to DGEMM aren't large enough for the array size parameters you have given.

Re: Technical question - crash using MKL functions

lsheva — Mon, 11 Feb 2008 12:40:26 GMT

Hello again,

I debugged the code that I am testing (the sources of the dll), and saw the crash happens only after more than 2500 calls to the same code.

It crashes on a call to the dgetrf(...) function, which, as I asume, calls to dgemm(...) .

I tried to locate memory leaks before the crash, but I couldn't find any.

Is there anything you know about the impementation of the dgetrf(...) that may cause the stack look like it is in my previous message?

Thank you,

Liad.

Re: Technical question - crash using MKL functions

Andrey_G_Intel2 — Mon, 11 Feb 2008 13:48:09 GMT

Liad,

am I understand correctly what you are trying to build your own dll where MKL used?

With which MKL libraries you are linking your project?

Andrey

Re: Technical question - crash using MKL functions

lsheva — Mon, 11 Feb 2008 14:23:58 GMT

Hi Andrey,

I am trying to test my dll.

The dlluses mkl_c.lib and libguide40.lib, from MKL 9.0.

In the dll, the following files are included:

mkl_lapack.h,

mkl_vml.h, mkl_service.h

I have the dll sources so I can debug it.

I am not trying to build dll, I have a simple cpp file to allow me using the dll functions. (unit test)

It crashes inside one of the source files of the dll, exactly when I am calling the dgetrf(...) ( at the 2812th call ).

On the stack view, I see only a call to dgemm(...) and other MKL functions.

Thanks a lot,

Liad.

Re: Technical question - crash using MKL functions

Andrey_G_Intel2 — Tue, 12 Feb 2008 05:04:36 GMT

Liad,

in general, it`s prohibited to use statical MKL libraries in your own dll. Try to rebuild your dll with mkl_c_dll.lib library.

Andrey

Re: Technical question - crash using MKL functions

lsheva — Tue, 12 Feb 2008 09:46:39 GMT

Hi,

Ok, Thanks, I'll try it.

Meanwhile, I removed a frequent call to MKLFreeBuffers() , and changed it to one call at the ent of my tester.

For now it works fine, without any memory leaks or exceptions.

If you think there might be a problem with it - please let me know.

Thanks a lot for your help,

Liad.

Re: Technical question - crash using MKL functions

Andrey_G_Intel2 — Wed, 13 Feb 2008 13:20:26 GMT

In my best knowledge, some problems (memory leaks) in memory manager exists in MKL 9.0 and these problems were fixed in MKL 10.0 update 1.

You can try newes version of MKL.

Andrey