Squashed 'third_party/google-benchmark/' content from commit 785e2c3
Change-Id: Iaaca5eca89f717081452e643a233e86425b03e89
git-subtree-dir: third_party/google-benchmark
git-subtree-split: 785e2c3158589e8ef48c59ba80e48d76bdbd8902
diff --git a/src/sysinfo.cc b/src/sysinfo.cc
new file mode 100644
index 0000000..c0c07e5
--- /dev/null
+++ b/src/sysinfo.cc
@@ -0,0 +1,650 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "internal_macros.h"
+
+#ifdef BENCHMARK_OS_WINDOWS
+#include <shlwapi.h>
+#undef StrCat // Don't let StrCat in string_util.h be renamed to lstrcatA
+#include <versionhelpers.h>
+#include <windows.h>
+#include <codecvt>
+#else
+#include <fcntl.h>
+#ifndef BENCHMARK_OS_FUCHSIA
+#include <sys/resource.h>
+#endif
+#include <sys/time.h>
+#include <sys/types.h> // this header must be included before 'sys/sysctl.h' to avoid compilation error on FreeBSD
+#include <unistd.h>
+#if defined BENCHMARK_OS_FREEBSD || defined BENCHMARK_OS_MACOSX || \
+ defined BENCHMARK_OS_NETBSD || defined BENCHMARK_OS_OPENBSD
+#define BENCHMARK_HAS_SYSCTL
+#include <sys/sysctl.h>
+#endif
+#endif
+#if defined(BENCHMARK_OS_SOLARIS)
+#include <kstat.h>
+#endif
+
+#include <algorithm>
+#include <array>
+#include <bitset>
+#include <cerrno>
+#include <climits>
+#include <cstdint>
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <limits>
+#include <memory>
+#include <sstream>
+#include <locale>
+
+#include "check.h"
+#include "cycleclock.h"
+#include "internal_macros.h"
+#include "log.h"
+#include "sleep.h"
+#include "string_util.h"
+
+namespace benchmark {
+namespace {
+
+void PrintImp(std::ostream& out) { out << std::endl; }
+
+template <class First, class... Rest>
+void PrintImp(std::ostream& out, First&& f, Rest&&... rest) {
+ out << std::forward<First>(f);
+ PrintImp(out, std::forward<Rest>(rest)...);
+}
+
+template <class... Args>
+BENCHMARK_NORETURN void PrintErrorAndDie(Args&&... args) {
+ PrintImp(std::cerr, std::forward<Args>(args)...);
+ std::exit(EXIT_FAILURE);
+}
+
+#ifdef BENCHMARK_HAS_SYSCTL
+
+/// ValueUnion - A type used to correctly alias the byte-for-byte output of
+/// `sysctl` with the result type it's to be interpreted as.
+struct ValueUnion {
+ union DataT {
+ uint32_t uint32_value;
+ uint64_t uint64_value;
+ // For correct aliasing of union members from bytes.
+ char bytes[8];
+ };
+ using DataPtr = std::unique_ptr<DataT, decltype(&std::free)>;
+
+ // The size of the data union member + its trailing array size.
+ size_t Size;
+ DataPtr Buff;
+
+ public:
+ ValueUnion() : Size(0), Buff(nullptr, &std::free) {}
+
+ explicit ValueUnion(size_t BuffSize)
+ : Size(sizeof(DataT) + BuffSize),
+ Buff(::new (std::malloc(Size)) DataT(), &std::free) {}
+
+ ValueUnion(ValueUnion&& other) = default;
+
+ explicit operator bool() const { return bool(Buff); }
+
+ char* data() const { return Buff->bytes; }
+
+ std::string GetAsString() const { return std::string(data()); }
+
+ int64_t GetAsInteger() const {
+ if (Size == sizeof(Buff->uint32_value))
+ return static_cast<int32_t>(Buff->uint32_value);
+ else if (Size == sizeof(Buff->uint64_value))
+ return static_cast<int64_t>(Buff->uint64_value);
+ BENCHMARK_UNREACHABLE();
+ }
+
+ uint64_t GetAsUnsigned() const {
+ if (Size == sizeof(Buff->uint32_value))
+ return Buff->uint32_value;
+ else if (Size == sizeof(Buff->uint64_value))
+ return Buff->uint64_value;
+ BENCHMARK_UNREACHABLE();
+ }
+
+ template <class T, int N>
+ std::array<T, N> GetAsArray() {
+ const int ArrSize = sizeof(T) * N;
+ CHECK_LE(ArrSize, Size);
+ std::array<T, N> Arr;
+ std::memcpy(Arr.data(), data(), ArrSize);
+ return Arr;
+ }
+};
+
+ValueUnion GetSysctlImp(std::string const& Name) {
+#if defined BENCHMARK_OS_OPENBSD
+ int mib[2];
+
+ mib[0] = CTL_HW;
+ if ((Name == "hw.ncpu") || (Name == "hw.cpuspeed")){
+ ValueUnion buff(sizeof(int));
+
+ if (Name == "hw.ncpu") {
+ mib[1] = HW_NCPU;
+ } else {
+ mib[1] = HW_CPUSPEED;
+ }
+
+ if (sysctl(mib, 2, buff.data(), &buff.Size, nullptr, 0) == -1) {
+ return ValueUnion();
+ }
+ return buff;
+ }
+ return ValueUnion();
+#else
+ size_t CurBuffSize = 0;
+ if (sysctlbyname(Name.c_str(), nullptr, &CurBuffSize, nullptr, 0) == -1)
+ return ValueUnion();
+
+ ValueUnion buff(CurBuffSize);
+ if (sysctlbyname(Name.c_str(), buff.data(), &buff.Size, nullptr, 0) == 0)
+ return buff;
+ return ValueUnion();
+#endif
+}
+
+BENCHMARK_MAYBE_UNUSED
+bool GetSysctl(std::string const& Name, std::string* Out) {
+ Out->clear();
+ auto Buff = GetSysctlImp(Name);
+ if (!Buff) return false;
+ Out->assign(Buff.data());
+ return true;
+}
+
+template <class Tp,
+ class = typename std::enable_if<std::is_integral<Tp>::value>::type>
+bool GetSysctl(std::string const& Name, Tp* Out) {
+ *Out = 0;
+ auto Buff = GetSysctlImp(Name);
+ if (!Buff) return false;
+ *Out = static_cast<Tp>(Buff.GetAsUnsigned());
+ return true;
+}
+
+template <class Tp, size_t N>
+bool GetSysctl(std::string const& Name, std::array<Tp, N>* Out) {
+ auto Buff = GetSysctlImp(Name);
+ if (!Buff) return false;
+ *Out = Buff.GetAsArray<Tp, N>();
+ return true;
+}
+#endif
+
+template <class ArgT>
+bool ReadFromFile(std::string const& fname, ArgT* arg) {
+ *arg = ArgT();
+ std::ifstream f(fname.c_str());
+ if (!f.is_open()) return false;
+ f >> *arg;
+ return f.good();
+}
+
+bool CpuScalingEnabled(int num_cpus) {
+ // We don't have a valid CPU count, so don't even bother.
+ if (num_cpus <= 0) return false;
+#ifndef BENCHMARK_OS_WINDOWS
+ // On Linux, the CPUfreq subsystem exposes CPU information as files on the
+ // local file system. If reading the exported files fails, then we may not be
+ // running on Linux, so we silently ignore all the read errors.
+ std::string res;
+ for (int cpu = 0; cpu < num_cpus; ++cpu) {
+ std::string governor_file =
+ StrCat("/sys/devices/system/cpu/cpu", cpu, "/cpufreq/scaling_governor");
+ if (ReadFromFile(governor_file, &res) && res != "performance") return true;
+ }
+#endif
+ return false;
+}
+
+int CountSetBitsInCPUMap(std::string Val) {
+ auto CountBits = [](std::string Part) {
+ using CPUMask = std::bitset<sizeof(std::uintptr_t) * CHAR_BIT>;
+ Part = "0x" + Part;
+ CPUMask Mask(benchmark::stoul(Part, nullptr, 16));
+ return static_cast<int>(Mask.count());
+ };
+ size_t Pos;
+ int total = 0;
+ while ((Pos = Val.find(',')) != std::string::npos) {
+ total += CountBits(Val.substr(0, Pos));
+ Val = Val.substr(Pos + 1);
+ }
+ if (!Val.empty()) {
+ total += CountBits(Val);
+ }
+ return total;
+}
+
+BENCHMARK_MAYBE_UNUSED
+std::vector<CPUInfo::CacheInfo> GetCacheSizesFromKVFS() {
+ std::vector<CPUInfo::CacheInfo> res;
+ std::string dir = "/sys/devices/system/cpu/cpu0/cache/";
+ int Idx = 0;
+ while (true) {
+ CPUInfo::CacheInfo info;
+ std::string FPath = StrCat(dir, "index", Idx++, "/");
+ std::ifstream f(StrCat(FPath, "size").c_str());
+ if (!f.is_open()) break;
+ std::string suffix;
+ f >> info.size;
+ if (f.fail())
+ PrintErrorAndDie("Failed while reading file '", FPath, "size'");
+ if (f.good()) {
+ f >> suffix;
+ if (f.bad())
+ PrintErrorAndDie(
+ "Invalid cache size format: failed to read size suffix");
+ else if (f && suffix != "K")
+ PrintErrorAndDie("Invalid cache size format: Expected bytes ", suffix);
+ else if (suffix == "K")
+ info.size *= 1000;
+ }
+ if (!ReadFromFile(StrCat(FPath, "type"), &info.type))
+ PrintErrorAndDie("Failed to read from file ", FPath, "type");
+ if (!ReadFromFile(StrCat(FPath, "level"), &info.level))
+ PrintErrorAndDie("Failed to read from file ", FPath, "level");
+ std::string map_str;
+ if (!ReadFromFile(StrCat(FPath, "shared_cpu_map"), &map_str))
+ PrintErrorAndDie("Failed to read from file ", FPath, "shared_cpu_map");
+ info.num_sharing = CountSetBitsInCPUMap(map_str);
+ res.push_back(info);
+ }
+
+ return res;
+}
+
+#ifdef BENCHMARK_OS_MACOSX
+std::vector<CPUInfo::CacheInfo> GetCacheSizesMacOSX() {
+ std::vector<CPUInfo::CacheInfo> res;
+ std::array<uint64_t, 4> CacheCounts{{0, 0, 0, 0}};
+ GetSysctl("hw.cacheconfig", &CacheCounts);
+
+ struct {
+ std::string name;
+ std::string type;
+ int level;
+ uint64_t num_sharing;
+ } Cases[] = {{"hw.l1dcachesize", "Data", 1, CacheCounts[1]},
+ {"hw.l1icachesize", "Instruction", 1, CacheCounts[1]},
+ {"hw.l2cachesize", "Unified", 2, CacheCounts[2]},
+ {"hw.l3cachesize", "Unified", 3, CacheCounts[3]}};
+ for (auto& C : Cases) {
+ int val;
+ if (!GetSysctl(C.name, &val)) continue;
+ CPUInfo::CacheInfo info;
+ info.type = C.type;
+ info.level = C.level;
+ info.size = val;
+ info.num_sharing = static_cast<int>(C.num_sharing);
+ res.push_back(std::move(info));
+ }
+ return res;
+}
+#elif defined(BENCHMARK_OS_WINDOWS)
+std::vector<CPUInfo::CacheInfo> GetCacheSizesWindows() {
+ std::vector<CPUInfo::CacheInfo> res;
+ DWORD buffer_size = 0;
+ using PInfo = SYSTEM_LOGICAL_PROCESSOR_INFORMATION;
+ using CInfo = CACHE_DESCRIPTOR;
+
+ using UPtr = std::unique_ptr<PInfo, decltype(&std::free)>;
+ GetLogicalProcessorInformation(nullptr, &buffer_size);
+ UPtr buff((PInfo*)malloc(buffer_size), &std::free);
+ if (!GetLogicalProcessorInformation(buff.get(), &buffer_size))
+ PrintErrorAndDie("Failed during call to GetLogicalProcessorInformation: ",
+ GetLastError());
+
+ PInfo* it = buff.get();
+ PInfo* end = buff.get() + (buffer_size / sizeof(PInfo));
+
+ for (; it != end; ++it) {
+ if (it->Relationship != RelationCache) continue;
+ using BitSet = std::bitset<sizeof(ULONG_PTR) * CHAR_BIT>;
+ BitSet B(it->ProcessorMask);
+ // To prevent duplicates, only consider caches where CPU 0 is specified
+ if (!B.test(0)) continue;
+ CInfo* Cache = &it->Cache;
+ CPUInfo::CacheInfo C;
+ C.num_sharing = static_cast<int>(B.count());
+ C.level = Cache->Level;
+ C.size = Cache->Size;
+ switch (Cache->Type) {
+ case CacheUnified:
+ C.type = "Unified";
+ break;
+ case CacheInstruction:
+ C.type = "Instruction";
+ break;
+ case CacheData:
+ C.type = "Data";
+ break;
+ case CacheTrace:
+ C.type = "Trace";
+ break;
+ default:
+ C.type = "Unknown";
+ break;
+ }
+ res.push_back(C);
+ }
+ return res;
+}
+#endif
+
+std::vector<CPUInfo::CacheInfo> GetCacheSizes() {
+#ifdef BENCHMARK_OS_MACOSX
+ return GetCacheSizesMacOSX();
+#elif defined(BENCHMARK_OS_WINDOWS)
+ return GetCacheSizesWindows();
+#else
+ return GetCacheSizesFromKVFS();
+#endif
+}
+
+std::string GetSystemName() {
+#if defined(BENCHMARK_OS_WINDOWS)
+ std::string str;
+ const unsigned COUNT = MAX_COMPUTERNAME_LENGTH+1;
+ TCHAR hostname[COUNT] = {'\0'};
+ DWORD DWCOUNT = COUNT;
+ if (!GetComputerName(hostname, &DWCOUNT))
+ return std::string("");
+#ifndef UNICODE
+ str = std::string(hostname, DWCOUNT);
+#else
+ //Using wstring_convert, Is deprecated in C++17
+ using convert_type = std::codecvt_utf8<wchar_t>;
+ std::wstring_convert<convert_type, wchar_t> converter;
+ std::wstring wStr(hostname, DWCOUNT);
+ str = converter.to_bytes(wStr);
+#endif
+ return str;
+#else // defined(BENCHMARK_OS_WINDOWS)
+#ifdef BENCHMARK_OS_MACOSX //Mac Doesnt have HOST_NAME_MAX defined
+#define HOST_NAME_MAX 64
+#endif
+ char hostname[HOST_NAME_MAX];
+ int retVal = gethostname(hostname, HOST_NAME_MAX);
+ if (retVal != 0) return std::string("");
+ return std::string(hostname);
+#endif // Catch-all POSIX block.
+}
+
+int GetNumCPUs() {
+#ifdef BENCHMARK_HAS_SYSCTL
+ int NumCPU = -1;
+ if (GetSysctl("hw.ncpu", &NumCPU)) return NumCPU;
+ fprintf(stderr, "Err: %s\n", strerror(errno));
+ std::exit(EXIT_FAILURE);
+#elif defined(BENCHMARK_OS_WINDOWS)
+ SYSTEM_INFO sysinfo;
+ // Use memset as opposed to = {} to avoid GCC missing initializer false
+ // positives.
+ std::memset(&sysinfo, 0, sizeof(SYSTEM_INFO));
+ GetSystemInfo(&sysinfo);
+ return sysinfo.dwNumberOfProcessors; // number of logical
+ // processors in the current
+ // group
+#elif defined(BENCHMARK_OS_SOLARIS)
+ // Returns -1 in case of a failure.
+ int NumCPU = sysconf(_SC_NPROCESSORS_ONLN);
+ if (NumCPU < 0) {
+ fprintf(stderr,
+ "sysconf(_SC_NPROCESSORS_ONLN) failed with error: %s\n",
+ strerror(errno));
+ }
+ return NumCPU;
+#else
+ int NumCPUs = 0;
+ int MaxID = -1;
+ std::ifstream f("/proc/cpuinfo");
+ if (!f.is_open()) {
+ std::cerr << "failed to open /proc/cpuinfo\n";
+ return -1;
+ }
+ const std::string Key = "processor";
+ std::string ln;
+ while (std::getline(f, ln)) {
+ if (ln.empty()) continue;
+ size_t SplitIdx = ln.find(':');
+ std::string value;
+#if defined(__s390__)
+ // s390 has another format in /proc/cpuinfo
+ // it needs to be parsed differently
+ if (SplitIdx != std::string::npos) value = ln.substr(Key.size()+1,SplitIdx-Key.size()-1);
+#else
+ if (SplitIdx != std::string::npos) value = ln.substr(SplitIdx + 1);
+#endif
+ if (ln.size() >= Key.size() && ln.compare(0, Key.size(), Key) == 0) {
+ NumCPUs++;
+ if (!value.empty()) {
+ int CurID = benchmark::stoi(value);
+ MaxID = std::max(CurID, MaxID);
+ }
+ }
+ }
+ if (f.bad()) {
+ std::cerr << "Failure reading /proc/cpuinfo\n";
+ return -1;
+ }
+ if (!f.eof()) {
+ std::cerr << "Failed to read to end of /proc/cpuinfo\n";
+ return -1;
+ }
+ f.close();
+
+ if ((MaxID + 1) != NumCPUs) {
+ fprintf(stderr,
+ "CPU ID assignments in /proc/cpuinfo seem messed up."
+ " This is usually caused by a bad BIOS.\n");
+ }
+ return NumCPUs;
+#endif
+ BENCHMARK_UNREACHABLE();
+}
+
+double GetCPUCyclesPerSecond() {
+#if defined BENCHMARK_OS_LINUX || defined BENCHMARK_OS_CYGWIN
+ long freq;
+
+ // If the kernel is exporting the tsc frequency use that. There are issues
+ // where cpuinfo_max_freq cannot be relied on because the BIOS may be
+ // exporintg an invalid p-state (on x86) or p-states may be used to put the
+ // processor in a new mode (turbo mode). Essentially, those frequencies
+ // cannot always be relied upon. The same reasons apply to /proc/cpuinfo as
+ // well.
+ if (ReadFromFile("/sys/devices/system/cpu/cpu0/tsc_freq_khz", &freq)
+ // If CPU scaling is in effect, we want to use the *maximum* frequency,
+ // not whatever CPU speed some random processor happens to be using now.
+ || ReadFromFile("/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq",
+ &freq)) {
+ // The value is in kHz (as the file name suggests). For example, on a
+ // 2GHz warpstation, the file contains the value "2000000".
+ return freq * 1000.0;
+ }
+
+ const double error_value = -1;
+ double bogo_clock = error_value;
+
+ std::ifstream f("/proc/cpuinfo");
+ if (!f.is_open()) {
+ std::cerr << "failed to open /proc/cpuinfo\n";
+ return error_value;
+ }
+
+ auto startsWithKey = [](std::string const& Value, std::string const& Key) {
+ if (Key.size() > Value.size()) return false;
+ auto Cmp = [&](char X, char Y) {
+ return std::tolower(X) == std::tolower(Y);
+ };
+ return std::equal(Key.begin(), Key.end(), Value.begin(), Cmp);
+ };
+
+ std::string ln;
+ while (std::getline(f, ln)) {
+ if (ln.empty()) continue;
+ size_t SplitIdx = ln.find(':');
+ std::string value;
+ if (SplitIdx != std::string::npos) value = ln.substr(SplitIdx + 1);
+ // When parsing the "cpu MHz" and "bogomips" (fallback) entries, we only
+ // accept positive values. Some environments (virtual machines) report zero,
+ // which would cause infinite looping in WallTime_Init.
+ if (startsWithKey(ln, "cpu MHz")) {
+ if (!value.empty()) {
+ double cycles_per_second = benchmark::stod(value) * 1000000.0;
+ if (cycles_per_second > 0) return cycles_per_second;
+ }
+ } else if (startsWithKey(ln, "bogomips")) {
+ if (!value.empty()) {
+ bogo_clock = benchmark::stod(value) * 1000000.0;
+ if (bogo_clock < 0.0) bogo_clock = error_value;
+ }
+ }
+ }
+ if (f.bad()) {
+ std::cerr << "Failure reading /proc/cpuinfo\n";
+ return error_value;
+ }
+ if (!f.eof()) {
+ std::cerr << "Failed to read to end of /proc/cpuinfo\n";
+ return error_value;
+ }
+ f.close();
+ // If we found the bogomips clock, but nothing better, we'll use it (but
+ // we're not happy about it); otherwise, fallback to the rough estimation
+ // below.
+ if (bogo_clock >= 0.0) return bogo_clock;
+
+#elif defined BENCHMARK_HAS_SYSCTL
+ constexpr auto* FreqStr =
+#if defined(BENCHMARK_OS_FREEBSD) || defined(BENCHMARK_OS_NETBSD)
+ "machdep.tsc_freq";
+#elif defined BENCHMARK_OS_OPENBSD
+ "hw.cpuspeed";
+#else
+ "hw.cpufrequency";
+#endif
+ unsigned long long hz = 0;
+#if defined BENCHMARK_OS_OPENBSD
+ if (GetSysctl(FreqStr, &hz)) return hz * 1000000;
+#else
+ if (GetSysctl(FreqStr, &hz)) return hz;
+#endif
+ fprintf(stderr, "Unable to determine clock rate from sysctl: %s: %s\n",
+ FreqStr, strerror(errno));
+
+#elif defined BENCHMARK_OS_WINDOWS
+ // In NT, read MHz from the registry. If we fail to do so or we're in win9x
+ // then make a crude estimate.
+ DWORD data, data_size = sizeof(data);
+ if (IsWindowsXPOrGreater() &&
+ SUCCEEDED(
+ SHGetValueA(HKEY_LOCAL_MACHINE,
+ "HARDWARE\\DESCRIPTION\\System\\CentralProcessor\\0",
+ "~MHz", nullptr, &data, &data_size)))
+ return static_cast<double>((int64_t)data *
+ (int64_t)(1000 * 1000)); // was mhz
+#elif defined (BENCHMARK_OS_SOLARIS)
+ kstat_ctl_t *kc = kstat_open();
+ if (!kc) {
+ std::cerr << "failed to open /dev/kstat\n";
+ return -1;
+ }
+ kstat_t *ksp = kstat_lookup(kc, (char*)"cpu_info", -1, (char*)"cpu_info0");
+ if (!ksp) {
+ std::cerr << "failed to lookup in /dev/kstat\n";
+ return -1;
+ }
+ if (kstat_read(kc, ksp, NULL) < 0) {
+ std::cerr << "failed to read from /dev/kstat\n";
+ return -1;
+ }
+ kstat_named_t *knp =
+ (kstat_named_t*)kstat_data_lookup(ksp, (char*)"current_clock_Hz");
+ if (!knp) {
+ std::cerr << "failed to lookup data in /dev/kstat\n";
+ return -1;
+ }
+ if (knp->data_type != KSTAT_DATA_UINT64) {
+ std::cerr << "current_clock_Hz is of unexpected data type: "
+ << knp->data_type << "\n";
+ return -1;
+ }
+ double clock_hz = knp->value.ui64;
+ kstat_close(kc);
+ return clock_hz;
+#endif
+ // If we've fallen through, attempt to roughly estimate the CPU clock rate.
+ const int estimate_time_ms = 1000;
+ const auto start_ticks = cycleclock::Now();
+ SleepForMilliseconds(estimate_time_ms);
+ return static_cast<double>(cycleclock::Now() - start_ticks);
+}
+
+std::vector<double> GetLoadAvg() {
+#if defined BENCHMARK_OS_FREEBSD || defined(BENCHMARK_OS_LINUX) || \
+ defined BENCHMARK_OS_MACOSX || defined BENCHMARK_OS_NETBSD || \
+ defined BENCHMARK_OS_OPENBSD
+ constexpr int kMaxSamples = 3;
+ std::vector<double> res(kMaxSamples, 0.0);
+ const int nelem = getloadavg(res.data(), kMaxSamples);
+ if (nelem < 1) {
+ res.clear();
+ } else {
+ res.resize(nelem);
+ }
+ return res;
+#else
+ return {};
+#endif
+}
+
+} // end namespace
+
+const CPUInfo& CPUInfo::Get() {
+ static const CPUInfo* info = new CPUInfo();
+ return *info;
+}
+
+CPUInfo::CPUInfo()
+ : num_cpus(GetNumCPUs()),
+ cycles_per_second(GetCPUCyclesPerSecond()),
+ caches(GetCacheSizes()),
+ scaling_enabled(CpuScalingEnabled(num_cpus)),
+ load_avg(GetLoadAvg()) {}
+
+
+const SystemInfo& SystemInfo::Get() {
+ static const SystemInfo* info = new SystemInfo();
+ return *info;
+}
+
+SystemInfo::SystemInfo() : name(GetSystemName()) {}
+} // end namespace benchmark