6f29cdeee4
Buildroot would automatically enable multithreading in OpenBLAS if the
architecture supports it. However, one may want to avoid OpenBLAS creating
threads itself and configure single-threaded operation. To accommodate this
use case, add a config option for multithreading.
When multithreading is disabled but OpenBLAS functions are called in the
same application by multiple threads, then locking is mandatory. The
USE_LOCKING flag was added in version 0.3.7 with following release note:
a new option USE_LOCKING was added to ensure thread safety when OpenBLAS
itself is built without multithreading but will be called from multiple
threads.
However, if one knows that OpenBLAS will only be called from single-threaded
applications, then passing USE_LOCKING is not necessary, so make it a config
option too.
When multithreading is enabled, locking is implicitly enabled inside
openblas, so only provide the locking option when multithreading is
disabled.
Signed-off-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
98 lines
3.8 KiB
Plaintext
98 lines
3.8 KiB
Plaintext
config BR2_PACKAGE_OPENBLAS_DEFAULT_TARGET
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string
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default "P2" if BR2_x86_pentium2
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default "KATMAI" if BR2_x86_pentium3
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default "NORTHWOOD" if BR2_x86_pentium4
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default "PRESCOTT" if BR2_x86_prescott || BR2_x86_nocona
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default "BANIAS" if BR2_x86_pentium_m
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default "CORE2" if BR2_x86_core2
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default "NEHALEM" if BR2_x86_corei7 || BR2_x86_silvermont || BR2_x86_westmere
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default "SANDYBRIDGE" if BR2_x86_corei7_avx
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default "HASWELL" if BR2_x86_core_avx2
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default "ATOM" if BR2_x86_atom
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default "ATHLON" if BR2_x86_athlon || BR2_x86_athlon_4
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default "OPTERON" if BR2_x86_opteron
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default "OPTERON_SSE3" if BR2_x86_opteron_sse3
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default "BARCELONA" if BR2_x86_barcelona
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default "BOBCAT" if BR2_x86_jaguar
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default "STEAMROLLER" if BR2_x86_steamroller
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default "VIAC3" if BR2_x86_c3 || BR2_x86_c32
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default "POWER4" if BR2_powerpc_power4
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default "POWER5" if BR2_powerpc_power5
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default "POWER6" if BR2_powerpc_power6
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default "POWER7" if BR2_powerpc_power7
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default "POWER8" if BR2_powerpc_power8
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default "PPCG4" if BR2_powerpc_7400 || BR2_powerpc_7450
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default "PPC970" if BR2_powerpc_970
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default "PPC440" if BR2_powerpc_440
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default "PPC440FP2" if BR2_powerpc_440fp
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# P5600 is built with MSA support which is only available in Codescape toolchains
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default "P5600" if BR2_mips_p5600 && BR2_TOOLCHAIN_EXTERNAL_CODESCAPE_MTI_MIPS
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default "SICORTEX" if BR2_MIPS_CPU_MIPS64
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# I6400 is built with MSA support which is only available in Codescape toolchains
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default "I6400" if BR2_mips_i6400 && BR2_TOOLCHAIN_EXTERNAL_CODESCAPE_IMG_MIPS
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# OpenBLAS assumes SPARC=Sparc v9
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default "SPARC" if BR2_sparc_v9
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# Cortex-A15 always have a VFPv4
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default "CORTEXA15" if (BR2_cortex_a15 && BR2_ARM_EABIHF)
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# Cortex-A9 have an optional VFPv3, so we need to make sure it
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# is available
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default "CORTEXA9" if (BR2_cortex_a9 && BR2_ARM_EABIHF && \
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BR2_ARM_CPU_HAS_VFPV3)
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default "ARMV5" if BR2_ARM_CPU_ARMV5
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# On ARMv6, OpenBLAS assumes that a VFP is available, and
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# EABIhf is used
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default "ARMV6" if (BR2_ARM_CPU_ARMV6 && BR2_ARM_EABIHF && \
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BR2_ARM_CPU_HAS_VFPV2)
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# On ARMv7, OpenBLAS assumes that a full VFPv3+ is available
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# (and not the more limited D16 variant), and that EABIhf is
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# used.
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default "ARMV7" if (BR2_ARM_CPU_ARMV7A && BR2_ARM_EABIHF && \
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BR2_ARM_CPU_HAS_VFPV3)
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default "ARMV8" if BR2_aarch64 || BR2_aarch64_be
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help
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OpenBLAS target CPU. See TargetList.txt in the source tree for
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the possible target strings. A possible value is set
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automatically based on your Target Architecture Variant.
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config BR2_PACKAGE_OPENBLAS_ARCH_SUPPORTS
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bool
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default y if BR2_PACKAGE_OPENBLAS_DEFAULT_TARGET != ""
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config BR2_PACKAGE_OPENBLAS
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bool "openblas"
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depends on BR2_PACKAGE_OPENBLAS_ARCH_SUPPORTS
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help
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An optimized BLAS library based on GotoBLAS2 1.13 BSD version.
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https://www.openblas.net/
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if BR2_PACKAGE_OPENBLAS
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config BR2_PACKAGE_OPENBLAS_TARGET
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string "OpenBLAS target CPU"
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default BR2_PACKAGE_OPENBLAS_DEFAULT_TARGET
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config BR2_PACKAGE_OPENBLAS_USE_THREAD
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bool "use multithreading"
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default y
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depends on BR2_TOOLCHAIN_HAS_THREADS
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depends on !BR2_STATIC_LIBS
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help
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Tell OpenBLAS to use multithreading, by passing USE_THREAD=1.
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config BR2_PACKAGE_OPENBLAS_USE_LOCKING
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bool "use locking"
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default y
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depends on BR2_TOOLCHAIN_HAS_THREADS
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depends on !BR2_PACKAGE_OPENBLAS_USE_THREAD
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help
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Tell OpenBLAS to use locking, by passing USE_LOCKING=1.
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Locking is implicitly enabled when USE_THREAD=1.
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However, if USE_THREAD=0 (i.e. OpenBLAS itself will run in
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single-threaded mode) but an application makes OpenBLAS
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function calls from multiple threads, then locking is
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mandatory for correct operation.
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endif
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