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Update OpenBLAS and raise NUM_THREADS on Windows #287

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Update OpenBLAS and raise NUM_THREADS on Windows #287

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242c3f8
Update to v0.3.34-497
ndabas Oct 28, 2026
ddda0e1
Increase NUM_THREADS on Windows to match other platforms
ndabas Oct 28, 2026
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9 changes: 9 additions & 0 deletions CHANGELOG.md
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Original file line number Diff line number Diff line change
@@ -1,5 +1,14 @@
## OpenBLAS v0.3.34 (v0.3.34)

### 0.3.34.497.0 (2026-10-28)

- update to OpenBLAS develop 791b02a1, which includes OpenMathLib/OpenBLAS#6105.
This fixes a crash in the default allocator's overflow area: overflow slots
re-mapped a new buffer on every allocation and eventually wrote past the end
of `new_release_info`. Seen on Windows ARM64 with many concurrent callers.
- raise `NUM_THREADS` from 24 to 64 on Windows (amd64 and arm64), matching
the Linux and macOS builds.

### 0.3.34.481.0 (2026-10-20)

- update to latest develop HEAD, fix `NO_LIBGFORTRAN` patch
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2 changes: 1 addition & 1 deletion OpenBLAS
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Submodule OpenBLAS updated from 5137bb to 791b02
2 changes: 1 addition & 1 deletion openblas_commit.txt
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@@ -1 +1 @@
v0.3.34-481-g5137bb62
v0.3.34-497-g791b02a1
4 changes: 2 additions & 2 deletions pyproject.toml
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Expand Up @@ -8,8 +8,8 @@ build-backend = "setuptools.build_meta"

[project]
name = "scipy-openblas64"
# 0.3.34-481-g5137bb62
version = "0.3.34.481.0"
# v0.3.34-497-g791b02a1
version = "0.3.34.497.0"
requires-python = ">=3.7"
description = "Provides OpenBLAS for python packaging"
readme = "README.md"
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2 changes: 1 addition & 1 deletion tools/build_steps_win_arm64.bat
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Expand Up @@ -161,7 +161,7 @@ cmake .. -G Ninja ^
-DSYMBOLPREFIX="scipy_" ^
-DLIBNAMEPREFIX="scipy_" ^
-DUSE_THREADS=1 ^
-DNUM_THREADS=24 ^
-DNUM_THREADS=64 ^
%interface_flags%

if errorlevel 1 exit /b 1
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2 changes: 1 addition & 1 deletion tools/build_steps_windows.sh
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Expand Up @@ -106,7 +106,7 @@ sed -e "s/^VERSION = .*/VERSION = ${version}/" -i.bak Makefile.rule
# Build OpenBLAS
CFLAGS="$CFLAGS -fvisibility=protected -fno-ident" \
make BINARY=$build_bits DYNAMIC_ARCH=1 USE_THREAD=1 USE_OPENMP=0 \
NUM_THREADS=24 NO_WARMUP=1 NO_AFFINITY=1 CONSISTENT_FPCSR=1 \
NUM_THREADS=64 NO_WARMUP=1 NO_AFFINITY=1 CONSISTENT_FPCSR=1 \
BUILD_LAPACK_DEPRECATED=1 TARGET=PRESCOTT BUFFERSIZE=20 \
LDFLAGS="$LDFLAGS" \
DYNAMIC_LIST="$dynamic_list" \
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