Sagemaker AI Notebook : Cell execution takes forever.

Question

Hi all,

In Sagemaker AI, I have noticed that executing notebook cells takes forever very often times. Even a simple execution(e.g., 3+1) is not finished forever. To solve this, I reopen the notebook and execute the cell again, which works. But the problem happens very often times that it is very annoying to reopen it. Does anyone know the cause behind it?

Best,
DL

re:Post Agent · Answer

When notebook cells in SageMaker AI take forever to execute, even for simple operations, this typically indicates resource or kernel issues. Here are several potential causes and solutions:

**Check Resource Utilization**: The notebook instance may be running out of resources. Monitor your notebook instance's resource utilization to see if CPU, memory, or other resources are being exhausted. This can cause the kernel to become unresponsive.

**Review Jupyter Logs**: Check your Jupyter logs for kernel-related issues. You can monitor these logs in Amazon CloudWatch Logs, or access them directly by running `tail -f /var/log/jupyter.log` on your instance. This can help identify what's causing the kernel to hang.

**Reduce Output**: If your previous cells generated large amounts of output, this can cause subsequent cells to hang or execute slowly. Try reducing the amount of output your code prints.

**Browser and Network Issues**: Clear your browser cache and cookies, as these can sometimes interfere with notebook functionality. Also check for any firewalls or network configurations that might be blocking communication between your browser and the notebook instance.

**Update Your Instance**: Consider updating your notebook instance to ensure you're running the latest software versions, which may include bug fixes and performance improvements.

**Instance Type**: If you're working with large datasets or computationally intensive operations, you may need a larger instance type with more resources allocated to it.

If the problem persists after trying these solutions, you may want to contact AWS Support with details including your notebook instance ARN, Jupyter and Python versions, and any relevant error messages from the logs.  
**Sources**  
[Resolve missing output from cells in SageMaker AI notebook | AWS re:Post](https://repost.aws/knowledge-center/sagemaker-resolve-missing-output)

Venkata Thej Deep Jakkaraju · Answer

Instead of reopening the whole notebook, try:

1) Restart the kernel (quickest fix)
From the notebook menu → Kernel → Restart Kernel

2) If it keeps happening, reset the Studio app:
aws sagemaker list-apps --domain-id  --user-profile-name

aws sagemaker delete-app \
  --domain-id  \
  --user-profile-name  \
  --app-type KernelGateway \
  --app-name

It will auto-recreate on next launch.

Sagemaker AI Notebook : Cell execution takes forever.

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