cpuinfo is a library to detect essential for performance optimization information about host CPU.
Log processor name:
cpuinfo_initialize();
printf("Running on %s CPU\n", cpuinfo_get_package(0)->name);
Detect if target is a 32-bit or 64-bit ARM system:
#if CPUINFO_ARCH_ARM || CPUINFO_ARCH_ARM64
/* 32-bit ARM-specific code here */
#endif
Check if the host CPU supports ARM NEON
cpuinfo_initialize();
if (cpuinfo_has_arm_neon()) {
neon_implementation(arguments);
}
Check if the host CPU supports x86 AVX
cpuinfo_initialize();
if (cpuinfo_has_x86_avx()) {
avx_implementation(arguments);
}
Check if the thread runs on a Cortex-A53 core
cpuinfo_initialize();
switch (cpuinfo_get_current_core()->uarch) {
case cpuinfo_uarch_cortex_a53:
cortex_a53_implementation(arguments);
break;
default:
generic_implementation(arguments);
break;
}
Get the size of level 1 data cache on the fastest core in the processor (e.g. big core in big.LITTLE ARM systems):
cpuinfo_initialize();
const size_t l1_size = cpuinfo_get_processor(0)->cache.l1d->size;
Pin thread to cores sharing L2 cache with the current core (Linux or Android)
cpuinfo_initialize();
cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
const struct cpuinfo_cache* current_l2 = cpuinfo_get_current_processor()->cache.l2;
for (uint32_t i = 0; i < current_l2->processor_count; i++) {
CPU_SET(cpuinfo_get_processor(current_l2->processor_start + i)->linux_id, &cpu_set);
}
pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &cpu_set);
If you would like to provide your project's build environment with the necessary compiler and linker flags in a portable manner, the library by default when built enables CPUINFO_BUILD_PKG_CONFIG
and will generate a pkg-config manifest (libcpuinfo.pc). Here are several examples of how to use it:
If you used your distro's package manager to install the library, you can verify that it is available to your build environment like so:
$ pkg-config --cflags --libs libcpuinfo
-I/usr/include/x86_64-linux-gnu/ -L/lib/x86_64-linux-gnu/ -lcpuinfo
If you have installed the library from source into a non-standard prefix, pkg-config may need help finding it:
$ PKG_CONFIG_PATH="/home/me/projects/cpuinfo/prefix/lib/pkgconfig/:$PKG_CONFIG_PATH" pkg-config --cflags --libs libcpuinfo
-I/home/me/projects/cpuinfo/prefix/include -L/home/me/projects/cpuinfo/prefix/lib -lcpuinfo
To use with the GNU Autotools include the following snippet in your project's configure.ac
:
# CPU INFOrmation library...
PKG_CHECK_MODULES(
[libcpuinfo], [libcpuinfo], [],
[AC_MSG_ERROR([libcpuinfo missing...])])
YOURPROJECT_CXXFLAGS="$YOURPROJECT_CXXFLAGS $libcpuinfo_CFLAGS"
YOURPROJECT_LIBS="$YOURPROJECT_LIBS $libcpuinfo_LIBS"
To use with Meson you just need to add dependency('libcpuinfo')
as a dependency for your executable.
project(
'MyCpuInfoProject',
'cpp',
meson_version: '>=0.55.0'
)
executable(
'MyCpuInfoExecutable',
sources: 'main.cpp',
dependencies: dependency('libcpuinfo')
)
This project can be built using Bazel.
You can also use this library as a dependency to your Bazel project. Add to the WORKSPACE
file:
load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
git_repository(
name = "org_pytorch_cpuinfo",
branch = "master",
remote = "https://github.com/Vertexwahn/cpuinfo.git",
)
And to your BUILD
file:
cc_binary(
name = "cpuinfo_test",
srcs = [
# ...
],
deps = [
"@org_pytorch_cpuinfo//:cpuinfo",
],
)
To use with CMake use the FindPkgConfig module. Here is an example:
cmake_minimum_required(VERSION 3.6)
project("MyCpuInfoProject")
find_package(PkgConfig)
pkg_check_modules(CpuInfo REQUIRED IMPORTED_TARGET libcpuinfo)
add_executable(${PROJECT_NAME} main.cpp)
target_link_libraries(${PROJECT_NAME} PkgConfig::CpuInfo)
To use within a vanilla makefile, you can call pkg-config directly to supply compiler and linker flags using shell substitution.
CFLAGS=-g3 -Wall -Wextra -Werror ...
LDFLAGS=-lfoo ...
...
CFLAGS+= $(pkg-config --cflags libcpuinfo)
LDFLAGS+= $(pkg-config --libs libcpuinfo)
/proc/cpuinfo
on ARMro.chipname
, ro.board.platform
, ro.product.board
, ro.mediatek.platform
, ro.arch
properties (Android)dmesg
) on ARM Linux/proc/cpuinfo
on 32-bit ARM EABI (Linux)FPSID
and WCID
registers (32-bit ARM)getauxval
(Linux/ARM)/proc/self/auxv
(Android/ARM)/proc/cpuinfo
(Linux/pre-ARMv7)sysctlbyname
(Mach)typology
directories (ARM/Linux)cache
directories (Linux)GetLogicalProcessorInformationEx
on ARM64 Windows/proc/cpuinfo
(Linux)host_info
(Mach)GetLogicalProcessorInformationEx
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