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Diffstat (limited to 'third-party/benchmark/src/sysinfo.cc')
| -rw-r--r-- | third-party/benchmark/src/sysinfo.cc | 726 |
1 files changed, 0 insertions, 726 deletions
diff --git a/third-party/benchmark/src/sysinfo.cc b/third-party/benchmark/src/sysinfo.cc deleted file mode 100644 index c1969ea2d3fe..000000000000 --- a/third-party/benchmark/src/sysinfo.cc +++ /dev/null @@ -1,726 +0,0 @@ -// 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 || \ - defined BENCHMARK_OS_DRAGONFLY -#define BENCHMARK_HAS_SYSCTL -#include <sys/sysctl.h> -#endif -#endif -#if defined(BENCHMARK_OS_SOLARIS) -#include <kstat.h> -#endif -#if defined(BENCHMARK_OS_QNX) -#include <sys/syspage.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 <utility> - -#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(); -} - -CPUInfo::Scaling CpuScaling(int num_cpus) { - // We don't have a valid CPU count, so don't even bother. - if (num_cpus <= 0) return CPUInfo::Scaling::UNKNOWN; -#ifdef BENCHMARK_OS_QNX - return CPUInfo::Scaling::UNKNOWN; -#endif -#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 CPUInfo::Scaling::ENABLED; - } - return CPUInfo::Scaling::DISABLED; -#endif - return CPUInfo::Scaling::UNKNOWN; -} - -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 *= 1024; - } - 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; -} -#elif BENCHMARK_OS_QNX -std::vector<CPUInfo::CacheInfo> GetCacheSizesQNX() { - std::vector<CPUInfo::CacheInfo> res; - struct cacheattr_entry *cache = SYSPAGE_ENTRY(cacheattr); - uint32_t const elsize = SYSPAGE_ELEMENT_SIZE(cacheattr); - int num = SYSPAGE_ENTRY_SIZE(cacheattr) / elsize ; - for(int i = 0; i < num; ++i ) { - CPUInfo::CacheInfo info; - switch (cache->flags){ - case CACHE_FLAG_INSTR : - info.type = "Instruction"; - info.level = 1; - break; - case CACHE_FLAG_DATA : - info.type = "Data"; - info.level = 1; - break; - case CACHE_FLAG_UNIFIED : - info.type = "Unified"; - info.level = 2; - break; - case CACHE_FLAG_SHARED : - info.type = "Shared"; - info.level = 3; - break; - default : - continue; - break; - } - info.size = cache->line_size * cache->num_lines; - info.num_sharing = 0; - res.push_back(std::move(info)); - cache = SYSPAGE_ARRAY_ADJ_OFFSET(cacheattr, cache, elsize); - } - return res; -} -#endif - -std::vector<CPUInfo::CacheInfo> GetCacheSizes() { -#ifdef BENCHMARK_OS_MACOSX - return GetCacheSizesMacOSX(); -#elif defined(BENCHMARK_OS_WINDOWS) - return GetCacheSizesWindows(); -#elif defined(BENCHMARK_OS_QNX) - return GetCacheSizesQNX(); -#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) -#ifndef HOST_NAME_MAX -#ifdef BENCHMARK_HAS_SYSCTL // BSD/Mac Doesnt have HOST_NAME_MAX defined -#define HOST_NAME_MAX 64 -#elif defined(BENCHMARK_OS_NACL) -#define HOST_NAME_MAX 64 -#elif defined(BENCHMARK_OS_QNX) -#define HOST_NAME_MAX 154 -#elif defined(BENCHMARK_OS_RTEMS) -#define HOST_NAME_MAX 256 -#else -#warning "HOST_NAME_MAX not defined. using 64" -#define HOST_NAME_MAX 64 -#endif -#endif // def HOST_NAME_MAX - 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; -#elif defined(BENCHMARK_OS_QNX) - return static_cast<int>(_syspage_ptr->num_cpu); -#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(CPUInfo::Scaling scaling) { - // Currently, scaling is only used on linux path here, - // suppress diagnostics about it being unused on other paths. - (void)scaling; - -#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 disabled, use the the *current* frequency. - // Note that we specifically don't want to read cpuinfo_cur_freq, - // because it is only readable by root. - || (scaling == CPUInfo::Scaling::DISABLED && - ReadFromFile("/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq", - &freq)) - // Otherwise, if CPU scaling may be 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"; -#elif defined BENCHMARK_OS_DRAGONFLY - "hw.tsc_frequency"; -#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; -#elif defined (BENCHMARK_OS_QNX) - return static_cast<double>((int64_t)(SYSPAGE_ENTRY(cpuinfo)->speed) * - (int64_t)(1000 * 1000)); -#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 || defined BENCHMARK_OS_DRAGONFLY) && \ - !defined(__ANDROID__) - 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()), - scaling(CpuScaling(num_cpus)), - cycles_per_second(GetCPUCyclesPerSecond(scaling)), - caches(GetCacheSizes()), - load_avg(GetLoadAvg()) {} - -const SystemInfo& SystemInfo::Get() { - static const SystemInfo* info = new SystemInfo(); - return *info; -} - -SystemInfo::SystemInfo() : name(GetSystemName()) {} -} // end namespace benchmark |