topic Re:Custom MKL DLL generating unwanted dependencies in Intel® oneAPI Math Kernel Library

Custom MKL DLL generating unwanted dependencies

carsou — Mon, 09 May 2022 00:44:03 GMT

I am trying to create a custom MKL DLL via Visual Studio using the builder found in the "C:\Program Files (x86)\Intel\oneAPI\mkl\latest\tools\builder\MSVS_Projects\VS2022\libintel64" directory. I am also following the instructions found here: Building a Custom Dynamic-link Library in the Visual Studio*... (intel.com). I am simply trying to export the "cblas_dgemm" function. However, the generated DLL has the following dependencies:

Dump of file libmkl.dll File Type: DLL Image has the following dependencies: mkl_intel_thread.2.dll VCRUNTIME140.dll api-ms-win-crt-heap-l1-1-0.dll api-ms-win-crt-runtime-l1-1-0.dll KERNEL32.dll api-ms-win-crt-stdio-l1-1-0.dll

The problem is the "mkl_intel_thread.2.dll", which in turn has the following dependencies (and so on):

Dump of file mkl_intel_thread.2.dll File Type: DLL Image has the following dependencies: KERNEL32.dll Image has the following delay load dependencies: mkl_core.2.dll libiomp5md.dll

In past experiences in building custom DLLs for MKL, I was expecting the custom DLL to only be dependent on the "libiomp5md.dll", and not on the "mkl_intel_thread.2.dll". According to Distributing Your Custom Dynamic-link Library (intel.com), this should indeed be the case.

Any help would be greatly appreciated.

Re:Custom MKL DLL generating unwanted dependencies

ShanmukhS_Intel — Mon, 09 May 2022 11:22:27 GMT

Hi,

Thank you for posting on Intel Communities.

We would like to request you to try creating oneMKL custom dll using command prompt.

>>In past experiences in building custom DLLs for MKL, I was expecting the custom DLL to only be dependent on the "libiomp5md.dll", and not on the "mkl_intel_thread.2.dll".

Could you please let us know the previous version you used which was only dependent on libiomp5md.dll and current oneAPI version as well.

Best Regards,

Shanmukh.SS

Re: Re:Custom MKL DLL generating unwanted dependencies

carsou — Mon, 09 May 2022 12:20:26 GMT

Thank you for you suggestion.

If I build using the command prompt, as shown here: Using the Custom Dynamic-link Library Builder in the Command-line... (intel.com), it works fine (in the sense that the custom DLL is only dependent on "libiomp5md.dll", and not on other MKL libraries):

Dump of file mkl_custom.dll File Type: DLL Image has the following dependencies: KERNEL32.dll VCRUNTIME140.dll api-ms-win-crt-heap-l1-1-0.dll api-ms-win-crt-string-l1-1-0.dll api-ms-win-crt-convert-l1-1-0.dll api-ms-win-crt-stdio-l1-1-0.dll api-ms-win-crt-environment-l1-1-0.dll api-ms-win-crt-runtime-l1-1-0.dll libiomp5md.dll api-ms-win-crt-time-l1-1-0.dll

And the size of the custom DLL is now much larger (7 600 KB vs 18 KB).

So it appears that the problem is within the provided Visual Studio projects (I am using VS 2022).

>> Could you please let us know the previous version you used which was only dependent on libiomp5md.dll and current oneAPI version as well.

The previous version I used (where I ran into no problems regarding the DLL dependencies) was via one of latest Intel Parallel Studio XE 2020 distributions (can't recall exact version). Currently, I am using MKL via the latest oneAPI distribution (2022.1.0).

Re:Custom MKL DLL generating unwanted dependencies

ShanmukhS_Intel — Wed, 11 May 2022 16:14:52 GMT

Hi,

Since your initial query is resolved, Could you please let us know if we could close the thread at our end.

If this resolves your issue, make sure to accept this as a solution. This would help others with similar issue.

Thank you!

Best Regards,

Shanmukh.SS

Re:Custom MKL DLL generating unwanted dependencies

ShanmukhS_Intel — Fri, 20 May 2022 03:34:09 GMT

Hi,

Reminder:

Has the solution provided helped? Is your issue resolved? Kindly let us know if we could close this thread at our end.

Best Regards,

Shanmukh.SS

Re:Custom MKL DLL generating unwanted dependencies

ShanmukhS_Intel — Fri, 27 May 2022 04:00:41 GMT

Hi,

We assume that your issue is resolved, If you need any additional information, please post a new question as this thread will no longer be monitored by Intel.

Best Regards,

Shanmukh.SS