CPU extension non-portable

[Jordan_S_1]

Hi,

I have a Windows 10 laptop that I build an application that runs OpenVino inference engine. However, when I move this application to a Windows 10 tablet the application crashes straight away. I have narrowed this down to cpu_extension.dll. If I use the DLL of openVino built on the tablet itself, it is fine. 

Is there a way to create the cpu_extension.dll on my laptop such that it is portable to the tablet? 

[Shubha_R_Intel]

Dear Jordan,

Does your Windows 10 tablet run ARM or Intel X86 ? OpenVino is not supported on all Intel processors. There is also a GPU dependency.

Please read this:

https://github.com/intel/compute-runtime/blob/master/README.md

https://software.intel.com/en-us/openvino-toolkit/hardware

Thanks,

Shubha

[Jordan_S_1]

Hi Shubha,

It is an Intel tablet. We can run OpenVino on it. But we need to use the cpu extension built on the tablet itself in the OpenVino samples.

Thanks,

Jordan

[Shubha_R_Intel]

Dear Jordan,

I understand. If you study the source code that goes into building cpu_extensions.dll,  the answer to your question can be found in C:\Program Files (x86)\IntelSWTools\openvino_2019.1.087\deployment_tools\inference_engine\src\extension\cmake\CPUID.cmake . Reading the CPUID plays a role in building cpu_extensions.dll . So if you build that DLL on your laptop, there is no way it can work on your tablet, unless you modify that file somehow (which I don't suggest).

To experiment with such things, I'd rather you go for the dldt  github:

https://github.com/opencv/dldt/tree/2019

I'm sure it's possible to build on the laptop and transfer the cpu_extensions.dll onto your tablet, but you'd have to hardcode stuff which the CPUID command automatically returns.

Hope it helps

Thanks for using OpenVino

Shubha

[Wong__Jeremy]

Dear Jordan,

I guess that your tablet is using Intel ATOM processor which supports SSE instruction set only, while your desktop computer is using modern CPU which supports AVX2 instruction set / AVX512 instruction set. In my computer, the file name of the CPU extension is "cpu_extension_avx2.dll" which suggests that the DLL file is for processors supporting AVX2 instruction set. How's yours?