TDA4VM: Executing the SDK parallelly in two different processes in Emulation mode.

Sundarraj Nataraj

Part Number: TDA4VM

We have installed/configured "ti-processor-sdk-rtos-j721e-evm-08_04_00_02" in WSL ubuntu. Our use case requires, Executing this in parallel in two different processes. What we can notice is that when the second process starts, the first process hits a segmentation fault. Particularly we are trying to run app_dof from basic_demos. Our question is, can this SDK run/process two independent set of images in parallel without affecting each other. We have a shell script that makes sure these two instances are launched as different processes. But, somehow, second process makes the first process hit segmentation fault.

over 1 year ago

0 Keerthy J over 1 year ago

TI__Guru**** 162500 points

Hi Sundar,

We will need more details on the above. Could you please share the steps to reproduce the issue you are seeing?

It will help us get to the right expert.

- Keerthy

0 Sundarraj Nataraj over 1 year ago in reply to Keerthy J

Prodigy 120 points

1. compile the sdk as usual.

2. Create a shell script that spins up two processes. In our case app_dof.

3. You can notice that one of the processes that launched early will hit a seg fault.

0 Nikhil Dasan over 1 year ago in reply to Sundarraj Nataraj

TI__Guru* 84746 points

Hi Sundarraj,

Could you provide the shell script that you are using? So that we would be aligned on the environment?

Could you also share the logs from your end?

Regards,

Nikhil

0 Sundarraj Nataraj over 1 year ago in reply to Nikhil Dasan

Prodigy 120 points

BEGINNING OF SHELL SCRIPT

#!/bin/bash

export APP_DOF_DATA_PATH=/home/user/ti-processor-sdk-rtos-j721e-evm-08_04_00_02/vision_apps/apps/basic_demos/app_dof

cd ~/ti-processor-sdk-rtos-j721e-evm-08_04_00_02/vision_apps/out/PC/x86_64/LINUX/release

./vx_app_dense_optical_flow --cfg /home/user/ti-processor-sdk-rtos-j721e-evm-08_04_00_02/vision_apps/apps/basic_demos/app_dof/config/app.cfg

END OF SCRIPT

The above file, an external program is triggering multiple times. Every trigger will open the program in different process. We have modified our dof code. We can clearly see that multiple processes are opened. But what happens is the previous process hits Seg fault.

0 Nikhil Dasan over 1 year ago in reply to Sundarraj Nataraj

TI__Guru* 84746 points

Hi,

Thank you for sharing the script.
I shall try to reproduce this and get back to you by Thursday.

Regards,

Nikhil

0 Sundarraj Nataraj over 1 year ago in reply to Nikhil Dasan

Prodigy 120 points

Hi Nikhil, We are still waiting for you Reply.

0 Nikhil Dasan over 1 year ago in reply to Sundarraj Nataraj

TI__Guru* 84746 points

Hi,

Sorry for the delay in response.

Are you seeing this only on the PC emulation or are you seeing the same on the EVM?

I tried this on EVM i.e. run TIDL object detection demo (without display ofcourse) and I was able to run the same application 3 times in parallel as shown below.

./run_app_tidl_od.sh &

./run_app_tidl_od.sh

Is this something you are trying too?

Regards

Nikhil

0 Sundarraj Nataraj over 1 year ago in reply to Nikhil Dasan

Prodigy 120 points

I'm seeing this in PC emulation mode. It says it cannot allocate the memory on the second instance while the first instance is running.

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TDA4VM: Executing the SDK parallelly in two different processes in Emulation mode.