[bot-automerge] nccl v2.15.5-1

[regro-cf-autotick-bot]

It is very likely that the current package version for this feedstock is out of date.

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• Dependencies have been updated if changed: see upstream
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Closes: #79

Dependency Analysis

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[conda-forge-linter]

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I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[github-actions]

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[jakirkham]

@leofang, do you know what the conclusion was with issue ( #78 )? See this came up in comment ( #79 (review) )

Note: Stopped CI here so it doesn't automerge yet

[leofang]

Hi @jakirkham I believe @cliffwoolley made a patch that's included since NCCL v2.15.1-1: NVIDIA/nccl@78313a6. But the lesson here is we should statically link cudart like all other CUDA libraries to avoid issues (sorry, can't find internal guideline for this, but this is standard practice 😅). We need to change CUDARTLIB to cudart_static.

Should we make the change in #79 and let it propagate to newer versions?

[jakirkham]

@kkraus14 or @jaimergp, do you have thoughts on this?

[kkraus14]

@kkraus14 or @jaimergp, do you have thoughts on this?

IIRC there's some implications for some things related to the CUDA context related to dynamic vs static linking. I don't remember exactly what these implications are, but maybe you could ask around a bit internally @jakirkham?

If there aren't any implications I don't see why we would differ from the standard conda-forge policy regarding static vs dynamic linking unless explicitly necessary.

[leofang]

sorry, can't find internal guideline for this, but this is standard practice

IIRC there's some implications for some things related to the CUDA context related to dynamic vs static linking. I don't remember exactly what these implications are, but maybe you could ask around a bit internally

@kkraus14 @jakirkham Actually there is a public reference for this:
https://docs.nvidia.com/deploy/cuda-compatibility/index.html#faq

If we build our CUDA application using CUDA 11.0, can it continue to be used with newer NVIDIA drivers (e.g. CUDA 11.1/R455, 11.x etc.)? Or is it only the other way around?
Drivers have always been backwards compatible with CUDA. This means that a CUDA 11.0 application will be compatible with R450 (11.0), R455 (11.1) and beyond. CUDA applications typically statically include all the libraries (for example cudart, CUDA math libraries such as cuBLAS, cuFFT) they need, so they should work on new drivers or CUDA Toolkit installations.

[jakirkham]

Sorry for the slow reply. Got caught up with other things.

Not following why that means we need to statically link. It just seems to suggest there are users out there that choose to (and what happens in that case), which is a different thing.

[cliffwoolley]

You're not required to statically link the CUDA Runtime (libcudart_static.a), but doing so has a number of advantages. Further, static linking to cudart is the default selection when nvcc is used for linking as well as the method used in all of NVIDIA's prebuilt binaries.

[jakirkham]

Static linking in package management has several downsides:

• Larger binaries with duplicated material
• Less visibility as to what is included in those binaries
• More cumbersome process of getting bug fixes/features
• Potential complications around licensing

This is covered in more detail in CFEP 18.

As Keith noted above, unless there is a compelling reason (not seeing it yet), we should be using dynamic libraries here.

[leofang]

John, what do you propose to fix #78?

[leofang]

Also, this discussion is very odd to me. We only have this discussion as we choose to build NCCL here, instead of using the pre-built binary as done in all other NVIDIA-related feedstocks. I would prefer to pick one decision quickly and move on. There are a lot of other public challenges to discuss and pan out, and this is not on my list 😅

[jakirkham]

Sorry for the slow reply here

As part of the CUDA 12 bringup work recently, we decided to use cudart statically generally. Relevant discussion starts with comment ( conda-forge/staged-recipes#21723 (comment) )

Given we are generally preferring linking cudart statically, it seems reasonable to do the same here

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[leofang]

@conda-forge-admin, please rerender

[github-actions]

Hi! This is the friendly conda-forge automerge bot!

It appears that not all commits to this PR were made by the bot. Thus this PR is not being automatically merged. Please add the automerge label again (or ask a maintainer to do so) if you'd like to enable automerge again!

[github-actions]

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I tried to rerender for you, but it looks like there was nothing to do.

This message was generated by GitHub actions workflow run https://github.com/conda-forge/nccl-feedstock/actions/runs/4678170947.

[leofang]

Merge and retry on main.

[jakirkham]

Awesome! Thank you Leo for shepherding all of these in ❤️

[leofang]

All 11 packages are up on anaconda.org.