AWS SDK Secure Tunneling causing an individual core to persistently stay at 100%

[JosepTeruel]

Describe the bug

As referenced on this issue (#596). We have made some changes to our code to start using the v2 SDK and to eliminate the unnecessary infinite loop. However, we are still experiencing 100% CPU usage on one core.

You mentioned that we might consider using Greengrass, but since we don’t require offline communication between IPCs, we are currently using AWS IoT Core Things.

Are there specific scenarios where Greengrass could provide better advantages? Our primary focus is ensuring secure tunneling within our IPC setup.

Regression Issue

• Select this option if this issue appears to be a regression.

Expected Behavior

CPU usage is very low

Current Behavior

CPU usage is at 100%

Reproduction Steps

We run the attached script as a service within the IPC which is based on AWS documentation.

secure_tunneling.txt

Possible Solution

No response

Additional Information/Context

No response

SDK version used

1.5.4

Environment details (OS name and version, etc.)

Ubuntu 22.04

[jmklix]

It looks like you are still running into the same problem. In your code you have this while loop:

while True:
    output = process.stdout.readline()
    if output == b'' and process.poll() is not None:
        break
    if output:
        output_str = output.decode('utf-8').strip()
        if "[error]" in output_str:
            logger.error("Error detected, stopping process.")
            process.terminate()
            break

Your program will still run in a continuous loop in some cases. That is likely the cause of the 100% cpu usage. Take a look at this stack overflow answer on possible solutions: https://stackoverflow.com/a/28010179

[github-actions]

Greetings! It looks like this issue hasn’t been active in longer than a week. We encourage you to check if this is still an issue in the latest release. Because it has been longer than a week since the last update on this, and in the absence of more information, we will be closing this issue soon. If you find that this is still a problem, please feel free to provide a comment or add an upvote to prevent automatic closure, or if the issue is already closed, please feel free to open a new one.