video_objects_scalable slows down when increasing ncs number

[idata]

Hi,

I'm using ncs v1 with a pi 3+. With one ncs I have 8fps, 2: 15 fps. But with 3, the fps number doesn't change, and with 4 ncs, the fps slows down to 7 .

[idata]

@spi100

Are you using Python?

If you are using Python, the performance of MultiThread will be exacerbated by GIL (Global Interpreter Lock).Performance improves when using MultiProcess.

Sample of MultiProcess + MultiThread + MultiStick + MultiGraph + etc…

https://github.com/PINTO0309/MobileNet-SSD-RealSense.git

[idata]

@PINTO yes, I do. Thanks for the tip, I'm going to have a look.

Regards

[idata]

@PINTO I've read your git hub page, a clear and pretty good job. Now I've a better understanding of what you explained in your previous post.

If I want to reach the 25 fps real time, at first, to avoid the GIL issue, I can write my code in C or C++.Perphaps also using an aaeon card and a realsense camera is likely a better solution than using a simple pi 3+ with a piCam.

[idata]

@spi100

If I want to reach the 25 fps real time

I realized the performance of over 30 FPS over NCS2 x2 + RaspberryPi3.

Perphaps also using an aaeon card and a realsense camera is likely a better solution than using a simple pi 3+ with a piCam.

There are points to be noted.

The minimum resolution of RealSense is 640x480.Inference by NCS or NCS 2 is very fast, but it is a very bottleneck because of the high load (640x480) on the preprocessing and post-processing CPUs.My benchmark understands that pre-processing and post-processing abilities are overwhelmingly deficient in ARM CPUs.Perhaps aaeon is a very good choice.

If you plan to introduce OpenVINO, I encourage you to refer to this benchmark.

When using Intel's CPU, OpenVINO has been optimized considerably.https://ncsforum.movidius.com/discussion/1329/lattepanda-alpha-openvino-cpu-core-m3-vs-ncs1-vs-ncs2-performance-comparison

[idata]

@PINTO Hi, I've tried to run your sample

python3 SingleStickSSDwithUSBCamera_OpenVINO_NCS2.py -mod 1 -wd 640 -ht 480 after installing openVino on my pi3+.I haven't any error message displayed on the console but no window is displayed on the screen.

Have you got any idea ?

regards

[idata]

The call to cv2.VideoCapture(0) is not ended. I use 'modprobe bcm2835_v4l2 ' to simulate an usb camera with a piCam. It could be the root cause of my issue ?

[idata]

@spi100

The following posts may be helpful.

https://raspberrypi.stackexchange.com/questions/32840/camera-ubuntu-modprobe-bcm2835-v4l2-error-could-not-insert-bcm2835-v4l2-op

Have you run raspi-config?