JuliaGPU/CUDA.jl

Add stream pool to avoid cuStreamCreate overhead

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#2,012 opened on Jul 29, 2023

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Description

Describe the bug

I tried adding multithreading to our code, and now we see occasional pauses due to CuStreamCreate:

Could be fixed by adding a Stream pool?

To reproduce

Available on request

Expected behavior

No pauses

Version info

Not sure exactly, I think it was Julia 1.8.5 with CUDA.jl 3.13.1 and CUDA 11.2.

Once our cluster upgrades the drivers, I can rerun with CUDA 12.

Additional context

cc @lcw

Contributor guide

Research direction
Investigate the usage of cuStreamCreate in the codebase and design a stream pool to reuse streams instead of creating new ones each time.
Tech stack
None
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JuliaCUDAGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45