OpenBLAS Warning: Detect OpenMP Loop and this application may hang. Please rebuild the library with USE_OPENMP = 1 option

Autonomous Machines Jetson & Embedded Systems Jetson Nano
,
1

Hello,

I am using yolov5 from YoloV5 but when I run that on my Nvidia Jetson Nano B01 I get the following message.

OpenBLAS Warning: Detect OpenMP Loop and this application may hang. Please rebuild the library with USE_OPENMP = 1 option.

I think that has something to do with OpenCV, why the Jetson Nano is so slow even then.

Does anyone have any idea why this is and how I can fix it?

Thank you

Screenshot from 2021-04-21 13-00-22
Screenshot from 2021-04-21 13-00-221920×1080 1.25 MB

3

Hi,

The error indicates the OpenBLAS doesn’t build with OpenMP support.
But YOLOv5 source do use OpenMP for acceleration.

To workaround this, you can try to set OMP_NUM_THREADS=1 to turn-off multi-thread.
Or you can re-install OpenBLAS from source by compiling it with USE_OPENMP=1.

Thanks.

4

Hi,

OK. Can you tell me how to reinstall OpenBlas from the source and compile with USE_OPENMP = 1

Thanks

5

Hi,

Please check the below for the details:

Thanks.

7

Hi, did reinstalling speed it up?