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GH-47229: [C++][Arm] Force mimalloc to generate armv8.0 binary - #47766
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pitrou
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Oct 9, 2025
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Can you check if this patch is still necessary if we apply #47589 ? |
pitrou
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cyb70289
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Oct 9, 2025
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Looks necessary for mimalloc 3.1.5. The default setting is still armv8.1-a unless this option is set. |
…ble binary Mimalloc default generates LSE atomic instructions only work on armv8.1. This causes illegal instruction on armv8.0 platforms like Raspberry4. This PR sets mimalloc build flag -DMI_NO_OPT_ARCH=ON to disable LSE instruction. Please note even with flag set, compiler and libc will replace the atmoic call with an ifunc that matches hardware best at runtime. That means LSE is used only if the running platform supports it.
pitrou
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pitrou
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Oct 9, 2025
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@github-actions crossbow submit -g cpp |
pitrou
commented
Oct 9, 2025
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@github-actions crossbow submit wheelcp313* |
Co-authored-by: Antoine Pitrou <pitrou@free.fr>
Revision: ff8e8c3 Submitted crossbow builds: ursacomputing/crossbow @ actions-7e9ea384fd
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Revision: ff8e8c3 Submitted crossbow builds: ursacomputing/crossbow @ actions-a989831826
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raulcd pushed a commit
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Oct 9, 2025
### Rationale for this change Mimalloc default generates LSE atomic instructions only work on armv8.1. This causes illegal instruction on armv8.0 platforms like Raspberry4. This PR sets mimalloc build flag -DMI_NO_OPT_ARCH=ON to disable LSE instruction. Please note even with flag set, compiler and libc will replace the atmoic call with an ifunc that matches hardware best at runtime. That means LSE is used only if the running platform supports it. ### What changes are included in this PR? Force mimalloc build flag -DMI_NO_OPT_ARCH=ON. ### Are these changes tested? Manually tested. ### Are there any user-facing changes? No. **This PR contains a "Critical Fix".** Fixes crashes on Armv8.0 platform. * GitHub Issue: #47229 Lead-authored-by: Yibo Cai <cyb70289@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr> Signed-off-by: Antoine Pitrou <antoine@python.org>
After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 8496d4e. There were no benchmark performance regressions. 🎉 The full Conbench report has more details. |
zanmato1984 pushed a commit
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Oct 15, 2025
…pache#47766) ### Rationale for this change Mimalloc default generates LSE atomic instructions only work on armv8.1. This causes illegal instruction on armv8.0 platforms like Raspberry4. This PR sets mimalloc build flag -DMI_NO_OPT_ARCH=ON to disable LSE instruction. Please note even with flag set, compiler and libc will replace the atmoic call with an ifunc that matches hardware best at runtime. That means LSE is used only if the running platform supports it. ### What changes are included in this PR? Force mimalloc build flag -DMI_NO_OPT_ARCH=ON. ### Are these changes tested? Manually tested. ### Are there any user-facing changes? No. **This PR contains a "Critical Fix".** Fixes crashes on Armv8.0 platform. * GitHub Issue: apache#47229 Lead-authored-by: Yibo Cai <cyb70289@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr> Signed-off-by: Antoine Pitrou <antoine@python.org>
Mottl pushed a commit
to Mottl/arrow
that referenced
this pull request
May 26, 2026
…pache#47766) ### Rationale for this change Mimalloc default generates LSE atomic instructions only work on armv8.1. This causes illegal instruction on armv8.0 platforms like Raspberry4. This PR sets mimalloc build flag -DMI_NO_OPT_ARCH=ON to disable LSE instruction. Please note even with flag set, compiler and libc will replace the atmoic call with an ifunc that matches hardware best at runtime. That means LSE is used only if the running platform supports it. ### What changes are included in this PR? Force mimalloc build flag -DMI_NO_OPT_ARCH=ON. ### Are these changes tested? Manually tested. ### Are there any user-facing changes? No. **This PR contains a "Critical Fix".** Fixes crashes on Armv8.0 platform. * GitHub Issue: apache#47229 Lead-authored-by: Yibo Cai <cyb70289@gmail.com> Co-authored-by: Antoine Pitrou <pitrou@free.fr> Signed-off-by: Antoine Pitrou <antoine@python.org>
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Rationale for this change
Mimalloc default generates LSE atomic instructions only work on armv8.1. This causes illegal instruction on armv8.0 platforms like Raspberry4. This PR sets mimalloc build flag -DMI_NO_OPT_ARCH=ON to disable LSE instruction.
Please note even with flag set, compiler and libc will replace the atmoic call with an ifunc that matches hardware best at runtime. That means LSE is used only if the running platform supports it.
What changes are included in this PR?
Force mimalloc build flag -DMI_NO_OPT_ARCH=ON.
Are these changes tested?
Manually tested.
Are there any user-facing changes?
No.
This PR contains a "Critical Fix".
Fixes crashes on Armv8.0 platform.