debug_app.md

Debugging Slow Response on Hugging Face Spaces

How to Check Logs

1. Go to your Space: https://huggingface.co/spaces/nocapdev/my-gradio-momask
2. Click the "Logs" tab at the top
3. Look for errors or warnings

Common Issues & What to Look For

Issue 1: Models Not Loading

Look for in logs:

FileNotFoundError: [Errno 2] No such file or directory: './checkpoints/...'

Cause: Model checkpoints aren't uploaded to HF Spaces

Issue 2: CUDA Not Available

Look for in logs:

RuntimeError: CUDA not available

Cause: HF free tier uses CPU, not GPU

Issue 3: Out of Memory

Look for in logs:

torch.cuda.OutOfMemoryError
SIGKILL (killed by system)

Cause: Model too large for available RAM/VRAM

Issue 4: Stuck on Generation

Look for in logs:

[Last line shows generation started but never completes]

Cause: Slow CPU inference or infinite loop

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Quick Fixes

Fix 1: Check if it's using CPU instead of GPU

The app defaults to CUDA but HF Spaces free tier only has CPU.

Action: Tell me what you see in the logs, and I'll help optimize for CPU or upgrade to GPU Space.

Fix 2: Models might be missing

Check logs for: "FileNotFoundError" or "checkpoint not found"

If missing: Models aren't uploaded. You need to either:

1. Upload models to HF Space (if <5GB)
2. Host models on HF Model Hub and download on startup
3. Use Spaces Secrets for large files

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What to Share

Copy from HF Spaces Logs tab and share:

1. Startup logs (first 20 lines)
2. Error messages (any red text)
3. Last 10 lines of logs when you submitted the prompt

This will help me identify the exact issue!