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build: mark --enable-heterogeneous as experimental #9815

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build: mark --enable-heterogeneous as experimental #9815

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thesamesam
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@thesamesam thesamesam commented Jan 3, 2022

If this change is accepted, we should do something similar for 4.0.x too.

@jsquyres has very kindly updated the downstream Gentoo bug and the READMEs in the repository to avoid anyone enabling this option downstream, but I think adding this to the ./configure --help text will be useful too.

We could possibly add a warning to the ./configure output too (some projects do this if they don't "like" a configuration that's been used / it's experimental) but this is probably enough? Let me know what you think.

Bug: #9697 (comment)
Bug: https://bugs.gentoo.org/828123
Signed-off-by: Sam James [email protected]

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Can one of the admins verify this patch?

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jsquyres commented Jan 3, 2022

@thesamesam Thanks! Check out the conversation on #9811 (particularly starting with #9811 (comment)) -- I'm trying to get clarity from @bosilca (one of the main maintainers of the heterogeneous stuff in Open MPI) on what exactly it is that we should do. Let's see what the resolution is over there.

@jsquyres jsquyres added this to the v4.1.3 milestone Jan 3, 2022
@gpaulsen gpaulsen requested review from AboorvaDevarajan, bosilca and jsquyres and removed request for AboorvaDevarajan January 12, 2022 16:10
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@gpaulsen I still need feedback from @bosilca on #9811. I think I actually had a verbal discussion with him about it, but I forgot what he told me. ☹️ I'm pinging him again for additional clarification...

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jsquyres commented Feb 4, 2022

@thesamesam Thanks for this PR! I have a few updates for you:

  1. We fixed the compile breakages with --enable-heterogeneous. Hence, the original issue reported at https://bugs.gentoo.org/828123 is now fully resolved for the v4.1.x branch (see v4.1.x: Fix compile failure with enable-heterogeneous. #9863) -- it wasn't an issue on the v4.0.x branch.
  2. That being said, we still do not encourage packagers to use --enable-heterogeneous by default. It does incur a small performance penalty. This option should only be used by users who actually need it.
  3. I have filed a few PRs to update the README text about --enable-heterogeneous to clarify what it does and does not support:

I think the above PRs should make this PR moot.

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jsquyres commented Feb 8, 2022

@thesamesam Are you ok with me closing this PR / is the text we added to the README's elsewhere sufficient?

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Hi @jsquyres! Really appreciate the summary. I think it looks plenty clear to me now!

Thanks a lot for your help here 😃

@thesamesam thesamesam closed this Feb 10, 2022
@thesamesam thesamesam deleted the v4.1.x branch February 10, 2022 07:11
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