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[1.13] openblas: Carry upstream fix for allocator contention between threads - #64257
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ViralBShah merged 2 commits intoOct 26, 2026
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…threads OpenBLAS's default (non-TLS) buffer allocator, which Julia uses, serializes threads that call BLAS concurrently. Small level-2 calls such as `trsv` from several threads then run slower than the same calls made one after another, and so do parallel solves with one supernodal CHOLMOD factor, which make many such calls. Carry the five commits of OpenMathLib/OpenBLAS#6105, which remove that contention and fix a crash once more buffers are in use than the main table holds. This is the 0.3.30 counterpart of #64249. The fix builds on the buffer table's fields being `_Atomic`, which upstream did after 0.3.30, so the patch starts with that part of the earlier upstream change alone. As on master, the overflow area's release table keeps its `malloc` instead of upstream's `calloc`. Assisted-by: Claude Code (Opus 5.5)
Use the build of OpenBLAS 0.3.30 that carries the allocator contention fix from the previous commit, so that the binaries get it too. Assisted-by: Claude Code (Opus 5.5)
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…threads (#64257) * [1.13] openblas: Carry upstream fix for allocator contention between threads OpenBLAS's default (non-TLS) buffer allocator, which Julia uses, serializes threads that call BLAS concurrently. Small level-2 calls such as `trsv` from several threads then run slower than the same calls made one after another, and so do parallel solves with one supernodal CHOLMOD factor, which make many such calls. Carry the five commits of OpenMathLib/OpenBLAS#6105, which remove that contention and fix a crash once more buffers are in use than the main table holds. This is the 0.3.30 counterpart of #64249. The fix builds on the buffer table's fields being `_Atomic`, which upstream did after 0.3.30, so the patch starts with that part of the earlier upstream change alone. As on master, the overflow area's release table keeps its `malloc` instead of upstream's `calloc`. Assisted-by: Claude Code (Opus 5.5) * [1.13] openblas: Update OpenBLAS_jll to 0.3.30+1 Use the build of OpenBLAS 0.3.30 that carries the allocator contention fix from the previous commit, so that the binaries get it too. Assisted-by: Claude Code (Opus 5.5)
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The 1.13 version of #64249: carries the fix from OpenMathLib/OpenBLAS#6105 for lock contention in OpenBLAS's default buffer allocator, as a patch on 0.3.30. Parallel supernodal CHOLMOD solves and small
trsvcalls from many threads get an order of magnitude faster.The first commit adds the patch to the source build. On 0.3.30 it also includes the small part of an earlier upstream change that the fix depends on, which makes the buffer table's fields
_Atomic. The second updatesOpenBLAS_jllto 0.3.30+1, built with the same patch in JuliaPackaging/Yggdrasil#15326.🤖 Generated with Claude Code