Don't multiversion on 32bit #308
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utilities/build_envs.sh
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| # Add sandybridge level similar to x86_64 above | ||
| "sandybridge,-xsaveopt,clone_all" | ||
| # Target only sandybridge because we run out of memory when multiversioning | ||
| "sandybridge" |
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Uhm... I think technically we must support pentium4.
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Or it would at least be a bigger decision than I thought.
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Why must we support it?
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I agree with Valentin. Unless we're willing to officially deprecate things, we must error on the side of caution. Let's throw away sandbridge and keep pentium4 for now, until we decide to jump the gun to sandybridge. For the record, sandybridge was released "only" 12 years ago, so it's not outside of the realm of possibility that computers built 10 years ago had pre-sandybridge chipsets.
I have an alternative idea on how to help this; I don't think it's multiversioning that's crashing, I think it's LLVM image generation, which we're multithreading by default. I'll try limiting that to one thread and seeing if it helps.
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We already don't multithread, not multiversioning does solve it for me, so it does affect stuff.
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We already don't multithread
What makes you say that? It looks to me like we set JULIA_IMAGE_THREADS to JULIA_CPU_THREADS unconditionally.
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I'm sure not multiversioning does help, as it decreases the amount of code we have to link at the end significantly.
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Right, but IIRC the Julia code has a 32 bit define for this.
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I was unaware of this, you're correct: https://github.com/JuliaLang/julia/blob/a8ef87369749abc16e334014108f3080b76ab507/src/aotcompile.cpp#L1407-L1410
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We run out of memory when multiversioning on 32 bit. Target only sandybridge which should be a reasonable default anyway.