c++ cpu_features 调研使用

news2025/11/11 23:02:54

一、背景

很多时候我们都会去关注内核，但是忽略了硬件本身的能力；尤其是可观测领域，大家一直在追求 trace、log的采样，metric也一直围绕集中在机器使用情况进行采集。

最近我一直在思考，如何能发觉机器的硬件能力？经过一段时间调研，我发现了谷歌的一个非常好用的cpu能力探测的工具，他的名字叫cpu_features,我们能不能发现机器硬件的cpu feature 然后上报成指标呢？

二、项目地址

https://github.com/google/cpu_features

三、编译

build_target_with_cmake() {

local BUILD_ROOT=$1

local LIB=$2

# check if already installed

if [ -f $INSTALL_PREFIX/lib/${LIB_FILES[$LIB]} ]; then

format_print "$LIB" "$INSTALL_PREFIX/lib/${LIB_FILES[$LIB]}"

return

fi

echo "Building $LIB..."

local BUILD_OPTIONS=$UNIVERSAL_OPTIONS

# check if there are additional options

if [[ -v LIB_OPTIONS[$LIB] ]]; then

BUILD_OPTIONS="${BUILD_OPTIONS} ${LIB_OPTIONS[$LIB]}"

fi

local LIB_SRC_DIR=$(pwd)/$LIB

local LIB_BUILD_DIR=$BUILD_ROOT/$LIB-build

mkdir -p $LIB_BUILD_DIR

cmake -S $LIB_SRC_DIR -B $LIB_BUILD_DIR $BUILD_OPTIONS

cmake --build $LIB_BUILD_DIR -j $(nproc)

cmake --install $LIB_BUILD_DIR

}

四、轻松发现cpu feature

#include <opentelemetry/metrics/meter.h>

#include <cpu_features/cpu_features_macros.h>

#if defined(CPU_FEATURES_ARCH_X86)

#include <cpu_features/cpuinfo_x86.h>

#include <opentelemetry/metrics/provider.h>

#elif defined(CPU_FEATURES_ARCH_ARM)

#include <cpu_features/cpuinfo_arm.h>

#elif defined(CPU_FEATURES_ARCH_AARCH64)

#include <cpu_features/cpuinfo_aarch64.h>

#elif defined(CPU_FEATURES_ARCH_MIPS)

#include <cpu_features/cpuinfo_mips.h>

#elif defined(CPU_FEATURES_ARCH_PPC)

#include <cpu_features/cpuinfo_ppc.h>

#elif defined(CPU_FEATURES_ARCH_S390X)

#include <cpu_features/cpuinfo_s390x.h>

#elif defined(CPU_FEATURES_ARCH_RISCV)

#include <cpu_features/cpuinfo_riscv.h>

#elif defined(CPU_FEATURES_ARCH_LOONGARCH)

#include <cpu_features/cpuinfo_loongarch.h>

#endif

void Collector::run() {

#if defined(CPU_FEATURES_ARCH_X86)

const ::cpu_features::X86Info info = ::cpu_features::GetX86Info();

const ::cpu_features::CacheInfo cache_info = ::cpu_features::GetX86CacheInfo();

#elif defined(CPU_FEATURES_ARCH_ARM)

const ArmInfo info = GetArmInfo();

AddMapEntry(root, "arch", CreateString("ARM"));

AddMapEntry(root, "implementer", CreateInt(info.implementer));

AddMapEntry(root, "architecture", CreateInt(info.architecture));

AddMapEntry(root, "variant", CreateInt(info.variant));

AddMapEntry(root, "part", CreateInt(info.part));

AddMapEntry(root, "revision", CreateInt(info.revision));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_AARCH64)

const Aarch64Info info = GetAarch64Info();

AddMapEntry(root, "arch", CreateString("aarch64"));

AddMapEntry(root, "implementer", CreateInt(info.implementer));

AddMapEntry(root, "variant", CreateInt(info.variant));

AddMapEntry(root, "part", CreateInt(info.part));

AddMapEntry(root, "revision", CreateInt(info.revision));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_MIPS)

const MipsInfo info = GetMipsInfo();

AddMapEntry(root, "arch", CreateString("mips"));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_PPC)

const PPCInfo info = GetPPCInfo();

const PPCPlatformStrings strings = GetPPCPlatformStrings();

AddMapEntry(root, "arch", CreateString("ppc"));

AddMapEntry(root, "platform", CreateString(strings.platform));

AddMapEntry(root, "model", CreateString(strings.model));

AddMapEntry(root, "machine", CreateString(strings.machine));

AddMapEntry(root, "cpu", CreateString(strings.cpu));

AddMapEntry(root, "instruction", CreateString(strings.type.platform));

AddMapEntry(root, "microarchitecture",

CreateString(strings.type.base_platform));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_S390X)

const S390XInfo info = GetS390XInfo();

const S390XPlatformStrings strings = GetS390XPlatformStrings();

AddMapEntry(root, "arch", CreateString("s390x"));

AddMapEntry(root, "platform", CreateString("zSeries"));

AddMapEntry(root, "model", CreateString(strings.type.platform));

AddMapEntry(root, "# processors", CreateInt(strings.num_processors));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_RISCV)

const RiscvInfo info = GetRiscvInfo();

AddMapEntry(root, "arch", CreateString("risc-v"));

AddMapEntry(root, "vendor", CreateString(info.vendor));

AddMapEntry(root, "microarchitecture", CreateString(info.uarch));

AddFlags(root, &info.features);

#elif defined(CPU_FEATURES_ARCH_LOONGARCH)

const LoongArchInfo info = GetLoongArchInfo();

AddMapEntry(root, "arch", CreateString("loongarch"));

AddFlags(root, &info.features);

#endif

}

五、效果展示

{"arch":"x86","brand":"12th Gen Intel(R) Core(TM) i5-1240P","family":6,"model":154,"stepping":3,"uarch":"INTEL_ADL","flags":["adx","aes","avx","avx2","avx_vnni","bmi1","bmi2","clflushopt","clfsh","clwb","cx16","cx8","erms","f16c","fma3","fpu","fs_rep_mov","fs_rep_stosb","gfni","lzcnt","mmx","movbe","movdir64b","movdiri","pclmulqdq","popcnt","rdrnd","rdseed","sha","smx","ss","sse","sse2","sse3","sse4_1","sse4_2","ssse3","tsc","vaes","vpclmulqdq"],"cache_info":[{"level":1,"cache_type":"data","cache_size":49152,"ways":12,"line_size":64,"tlb_entries":64,"partitioning":1},{"level":1,"cache_type":"instruction","cache_size":32768,"ways":8,"line_size":64,"tlb_entries":64,"partitioning":1},{"level":2,"cache_type":"unified","cache_size":1310720,"ways":10,"line_size":64,"tlb_entries":2048,"partitioning":1},{"level":3,"cache_type":"unified","cache_size":12582912,"ways":8,"line_size":64,"tlb_entries":24576,"partitioning":1}]}

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