Lightning-AI / Lightning-AI/pytorch-lightning

Datapipe handling with more than 1 GPU gives torch.multiprocessing.spawn.ProcessExitedException: process 1 terminated with exit code 1

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bug data handling strategy: ddp
Dominant language
Python
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Description

## 🐛 Bug

A dataloader around a datapipe works in cpu and gpu but not with 2 gpus

### To Reproduce

Code to reproduce (you need 2 gpus)
https://gist.github.com/franchesoni/7c048c0f0eb56f6aaa2731b0ead78a51#file-issue-py

Output (logged by ussing `python issue.py >> issue.out 2>&1`
https://gist.github.com/franchesoni/7c048c0f0eb56f6aaa2731b0ead78a51#file-issue-out

### Expected behavior

Not break

### Environment

* CUDA:
- GPU:
- TITAN V
- GeForce RTX 2080 Ti
- available: True
- version: 11.3
* Packages:
- numpy: 1.22.3
- pyTorch_debug: False
- pyTorch_version: 1.11.0
- pytorch-lightning: 1.6.3
- tqdm: 4.64.0
* System:
- OS: Linux
- architecture:
- 64bit
- ELF
- processor: x86_64
- python: 3.9.12
- version: #80~18.04.1-Ubuntu SMP Mon Apr 12 23:26:25 UTC 2021
### Additional context

cc @otaj @justusschock @awaelchli @ninginthecloud @rohitgr7 @kaushikb11 @akihironitta

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked issue.py reproduction and issue.out output, running it first with one GPU and then with two GPUs. Trace the dataloader and datapipe path around the reported torch.multiprocessing.spawn.ProcessExitedException. Done means the datapipe-backed dataloader runs on two GPUs without the process exiting with code 1.

Written by the indexing model from the issue text.

Assessment

Tech stack
python, pytorch
Domain
distributed-systems, machine-learning
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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