How many videos may I decode with one GPU at the same time ?
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- C++
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Description
I'm tryint to use DALI to accelerate my project. There are 6 videos to decode and each video contians 30 frames.
If I build the pipe and decode them one by one, it takes around 4.8 seconds. Then I set both batch size and num_threads to 6. The running time becomes 2.8 seconds.
It seems that only copy time is saved and the GPU still decodes the videos sequentially.
I wonder if I can decode all the 6 videos parallelly? Then the processing time will be around 4.8/6 ≈ 0.8 second?
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with DALI's video decoding pipeline and the reported batch size and num_threads settings. Compare the one-by-one and batched decoding cases described in the issue, then determine whether parallel GPU decoding is supported. Done means documenting the observed concurrency behavior and any supported configuration or limitation.
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Assessment
- Tech stack
- cpp, python
- Domain
- machine-learning, performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100