1 /* 2 * libjingle 3 * Copyright 2010 Google Inc. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, 9 * this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright notice, 11 * this list of conditions and the following disclaimer in the documentation 12 * and/or other materials provided with the distribution. 13 * 3. The name of the author may not be used to endorse or promote products 14 * derived from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED 17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO 19 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include "talk/base/cpumonitor.h" 29 30 #include <string> 31 32 #include "talk/base/common.h" 33 #include "talk/base/logging.h" 34 #include "talk/base/scoped_ptr.h" 35 #include "talk/base/systeminfo.h" 36 #include "talk/base/thread.h" 37 #include "talk/base/timeutils.h" 38 39 #ifdef WIN32 40 #include "talk/base/win32.h" 41 #include <winternl.h> 42 #endif 43 44 #ifdef POSIX 45 #include <sys/time.h> 46 #endif 47 48 #if defined(IOS) || defined(OSX) 49 #include <mach/mach_host.h> 50 #include <mach/mach_init.h> 51 #include <mach/host_info.h> 52 #include <mach/task.h> 53 #endif // defined(IOS) || defined(OSX) 54 55 #if defined(LINUX) || defined(ANDROID) 56 #include <sys/resource.h> 57 #include <errno.h> 58 #include <stdio.h> 59 #include "talk/base/fileutils.h" 60 #include "talk/base/pathutils.h" 61 #endif // defined(LINUX) || defined(ANDROID) 62 63 #if defined(IOS) || defined(OSX) 64 static uint64 TimeValueTToInt64(const time_value_t &time_value) { 65 return talk_base::kNumMicrosecsPerSec * time_value.seconds + 66 time_value.microseconds; 67 } 68 #endif // defined(IOS) || defined(OSX) 69 70 // How CpuSampler works 71 // When threads switch, the time they spent is accumulated to system counters. 72 // The time can be treated as user, kernel or idle. 73 // user time is applications. 74 // kernel time is the OS, including the thread switching code itself. 75 // typically kernel time indicates IO. 76 // idle time is a process that wastes time when nothing is ready to run. 77 // 78 // User time is broken down by process (application). One of the applications 79 // is the current process. When you add up all application times, this is 80 // system time. If only your application is running, system time should be the 81 // same as process time. 82 // 83 // All cores contribute to these accumulators. A dual core process is able to 84 // process twice as many cycles as a single core. The actual code efficiency 85 // may be worse, due to contention, but the available cycles is exactly twice 86 // as many, and the cpu load will reflect the efficiency. Hyperthreads behave 87 // the same way. The load will reflect 200%, but the actual amount of work 88 // completed will be much less than a true dual core. 89 // 90 // Total available performance is the sum of all accumulators. 91 // If you tracked this for 1 second, it would essentially give you the clock 92 // rate - number of cycles per second. 93 // Speed step / Turbo Boost is not considered, so infact more processing time 94 // may be available. 95 96 namespace talk_base { 97 98 // Note Tests on Windows show 600 ms is minimum stable interval for Windows 7. 99 static const int32 kDefaultInterval = 950; // Slightly under 1 second. 100 101 CpuSampler::CpuSampler() 102 : min_load_interval_(kDefaultInterval) 103 #ifdef WIN32 104 , get_system_times_(NULL), 105 nt_query_system_information_(NULL), 106 force_fallback_(false) 107 #endif 108 { 109 } 110 111 CpuSampler::~CpuSampler() { 112 } 113 114 // Set minimum interval in ms between computing new load values. Default 950. 115 void CpuSampler::set_load_interval(int min_load_interval) { 116 min_load_interval_ = min_load_interval; 117 } 118 119 bool CpuSampler::Init() { 120 sysinfo_.reset(new SystemInfo); 121 cpus_ = sysinfo_->GetMaxCpus(); 122 if (cpus_ == 0) { 123 return false; 124 } 125 #ifdef WIN32 126 // Note that GetSystemTimes is available in Windows XP SP1 or later. 127 // http://msdn.microsoft.com/en-us/library/ms724400.aspx 128 // NtQuerySystemInformation is used as a fallback. 129 if (!force_fallback_) { 130 get_system_times_ = GetProcAddress(GetModuleHandle(L"kernel32.dll"), 131 "GetSystemTimes"); 132 } 133 nt_query_system_information_ = GetProcAddress(GetModuleHandle(L"ntdll.dll"), 134 "NtQuerySystemInformation"); 135 if ((get_system_times_ == NULL) && (nt_query_system_information_ == NULL)) { 136 return false; 137 } 138 #endif 139 #if defined(LINUX) || defined(ANDROID) 140 Pathname sname("/proc/stat"); 141 sfile_.reset(Filesystem::OpenFile(sname, "rb")); 142 if (!sfile_) { 143 LOG_ERR(LS_ERROR) << "open proc/stat failed:"; 144 return false; 145 } 146 if (!sfile_->DisableBuffering()) { 147 LOG_ERR(LS_ERROR) << "could not disable buffering for proc/stat"; 148 return false; 149 } 150 #endif // defined(LINUX) || defined(ANDROID) 151 GetProcessLoad(); // Initialize values. 152 GetSystemLoad(); 153 // Help next user call return valid data by recomputing load. 154 process_.prev_load_time_ = 0u; 155 system_.prev_load_time_ = 0u; 156 return true; 157 } 158 159 float CpuSampler::UpdateCpuLoad(uint64 current_total_times, 160 uint64 current_cpu_times, 161 uint64 *prev_total_times, 162 uint64 *prev_cpu_times) { 163 float result = 0.f; 164 if (current_total_times < *prev_total_times || 165 current_cpu_times < *prev_cpu_times) { 166 LOG(LS_ERROR) << "Inconsistent time values are passed. ignored"; 167 } else { 168 const uint64 cpu_diff = current_cpu_times - *prev_cpu_times; 169 const uint64 total_diff = current_total_times - *prev_total_times; 170 result = (total_diff == 0ULL ? 0.f : 171 static_cast<float>(1.0f * cpu_diff / total_diff)); 172 if (result > static_cast<float>(cpus_)) { 173 result = static_cast<float>(cpus_); 174 } 175 *prev_total_times = current_total_times; 176 *prev_cpu_times = current_cpu_times; 177 } 178 return result; 179 } 180 181 float CpuSampler::GetSystemLoad() { 182 uint32 timenow = Time(); 183 int elapsed = static_cast<int>(TimeDiff(timenow, system_.prev_load_time_)); 184 if (min_load_interval_ != 0 && system_.prev_load_time_ != 0u && 185 elapsed < min_load_interval_) { 186 return system_.prev_load_; 187 } 188 #ifdef WIN32 189 uint64 total_times, cpu_times; 190 191 typedef BOOL (_stdcall *GST_PROC)(LPFILETIME, LPFILETIME, LPFILETIME); 192 typedef NTSTATUS (WINAPI *QSI_PROC)(SYSTEM_INFORMATION_CLASS, 193 PVOID, ULONG, PULONG); 194 195 GST_PROC get_system_times = reinterpret_cast<GST_PROC>(get_system_times_); 196 QSI_PROC nt_query_system_information = reinterpret_cast<QSI_PROC>( 197 nt_query_system_information_); 198 199 if (get_system_times) { 200 FILETIME idle_time, kernel_time, user_time; 201 if (!get_system_times(&idle_time, &kernel_time, &user_time)) { 202 LOG(LS_ERROR) << "::GetSystemTimes() failed: " << ::GetLastError(); 203 return 0.f; 204 } 205 // kernel_time includes Kernel idle time, so no need to 206 // include cpu_time as total_times 207 total_times = ToUInt64(kernel_time) + ToUInt64(user_time); 208 cpu_times = total_times - ToUInt64(idle_time); 209 210 } else { 211 if (nt_query_system_information) { 212 ULONG returned_length = 0; 213 scoped_array<SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION> processor_info( 214 new SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION[cpus_]); 215 nt_query_system_information( 216 ::SystemProcessorPerformanceInformation, 217 reinterpret_cast<void*>(processor_info.get()), 218 cpus_ * sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION), 219 &returned_length); 220 221 if (returned_length != 222 (cpus_ * sizeof(SYSTEM_PROCESSOR_PERFORMANCE_INFORMATION))) { 223 LOG(LS_ERROR) << "NtQuerySystemInformation has unexpected size"; 224 return 0.f; 225 } 226 227 uint64 current_idle = 0; 228 uint64 current_kernel = 0; 229 uint64 current_user = 0; 230 for (int ix = 0; ix < cpus_; ++ix) { 231 current_idle += processor_info[ix].IdleTime.QuadPart; 232 current_kernel += processor_info[ix].UserTime.QuadPart; 233 current_user += processor_info[ix].KernelTime.QuadPart; 234 } 235 total_times = current_kernel + current_user; 236 cpu_times = total_times - current_idle; 237 } else { 238 return 0.f; 239 } 240 } 241 #endif // WIN32 242 243 #if defined(IOS) || defined(OSX) 244 host_cpu_load_info_data_t cpu_info; 245 mach_msg_type_number_t info_count = HOST_CPU_LOAD_INFO_COUNT; 246 if (KERN_SUCCESS != host_statistics(mach_host_self(), HOST_CPU_LOAD_INFO, 247 reinterpret_cast<host_info_t>(&cpu_info), 248 &info_count)) { 249 LOG(LS_ERROR) << "::host_statistics() failed"; 250 return 0.f; 251 } 252 253 const uint64 cpu_times = cpu_info.cpu_ticks[CPU_STATE_NICE] + 254 cpu_info.cpu_ticks[CPU_STATE_SYSTEM] + 255 cpu_info.cpu_ticks[CPU_STATE_USER]; 256 const uint64 total_times = cpu_times + cpu_info.cpu_ticks[CPU_STATE_IDLE]; 257 #endif // defined(IOS) || defined(OSX) 258 259 #if defined(LINUX) || defined(ANDROID) 260 if (!sfile_) { 261 LOG(LS_ERROR) << "Invalid handle for proc/stat"; 262 return 0.f; 263 } 264 std::string statbuf; 265 sfile_->SetPosition(0); 266 if (!sfile_->ReadLine(&statbuf)) { 267 LOG_ERR(LS_ERROR) << "Could not read proc/stat file"; 268 return 0.f; 269 } 270 271 unsigned long long user; 272 unsigned long long nice; 273 unsigned long long system; 274 unsigned long long idle; 275 if (sscanf(statbuf.c_str(), "cpu %Lu %Lu %Lu %Lu", 276 &user, &nice, 277 &system, &idle) != 4) { 278 LOG_ERR(LS_ERROR) << "Could not parse cpu info"; 279 return 0.f; 280 } 281 const uint64 cpu_times = nice + system + user; 282 const uint64 total_times = cpu_times + idle; 283 #endif // defined(LINUX) || defined(ANDROID) 284 system_.prev_load_time_ = timenow; 285 system_.prev_load_ = UpdateCpuLoad(total_times, 286 cpu_times * cpus_, 287 &system_.prev_total_times_, 288 &system_.prev_cpu_times_); 289 return system_.prev_load_; 290 } 291 292 float CpuSampler::GetProcessLoad() { 293 uint32 timenow = Time(); 294 int elapsed = static_cast<int>(TimeDiff(timenow, process_.prev_load_time_)); 295 if (min_load_interval_ != 0 && process_.prev_load_time_ != 0u && 296 elapsed < min_load_interval_) { 297 return process_.prev_load_; 298 } 299 #ifdef WIN32 300 FILETIME current_file_time; 301 ::GetSystemTimeAsFileTime(¤t_file_time); 302 303 FILETIME create_time, exit_time, kernel_time, user_time; 304 if (!::GetProcessTimes(::GetCurrentProcess(), 305 &create_time, &exit_time, &kernel_time, &user_time)) { 306 LOG(LS_ERROR) << "::GetProcessTimes() failed: " << ::GetLastError(); 307 return 0.f; 308 } 309 310 const uint64 total_times = 311 ToUInt64(current_file_time) - ToUInt64(create_time); 312 const uint64 cpu_times = 313 (ToUInt64(kernel_time) + ToUInt64(user_time)); 314 #endif // WIN32 315 316 #ifdef POSIX 317 // Common to both OSX and Linux. 318 struct timeval tv; 319 gettimeofday(&tv, NULL); 320 const uint64 total_times = tv.tv_sec * kNumMicrosecsPerSec + tv.tv_usec; 321 #endif 322 323 #if defined(IOS) || defined(OSX) 324 // Get live thread usage. 325 task_thread_times_info task_times_info; 326 mach_msg_type_number_t info_count = TASK_THREAD_TIMES_INFO_COUNT; 327 328 if (KERN_SUCCESS != task_info(mach_task_self(), TASK_THREAD_TIMES_INFO, 329 reinterpret_cast<task_info_t>(&task_times_info), 330 &info_count)) { 331 LOG(LS_ERROR) << "::task_info(TASK_THREAD_TIMES_INFO) failed"; 332 return 0.f; 333 } 334 335 // Get terminated thread usage. 336 task_basic_info task_term_info; 337 info_count = TASK_BASIC_INFO_COUNT; 338 if (KERN_SUCCESS != task_info(mach_task_self(), TASK_BASIC_INFO, 339 reinterpret_cast<task_info_t>(&task_term_info), 340 &info_count)) { 341 LOG(LS_ERROR) << "::task_info(TASK_BASIC_INFO) failed"; 342 return 0.f; 343 } 344 345 const uint64 cpu_times = (TimeValueTToInt64(task_times_info.user_time) + 346 TimeValueTToInt64(task_times_info.system_time) + 347 TimeValueTToInt64(task_term_info.user_time) + 348 TimeValueTToInt64(task_term_info.system_time)); 349 #endif // defined(IOS) || defined(OSX) 350 351 #if defined(LINUX) || defined(ANDROID) 352 rusage usage; 353 if (getrusage(RUSAGE_SELF, &usage) < 0) { 354 LOG_ERR(LS_ERROR) << "getrusage failed"; 355 return 0.f; 356 } 357 358 const uint64 cpu_times = 359 (usage.ru_utime.tv_sec + usage.ru_stime.tv_sec) * kNumMicrosecsPerSec + 360 usage.ru_utime.tv_usec + usage.ru_stime.tv_usec; 361 #endif // defined(LINUX) || defined(ANDROID) 362 process_.prev_load_time_ = timenow; 363 process_.prev_load_ = UpdateCpuLoad(total_times, 364 cpu_times, 365 &process_.prev_total_times_, 366 &process_.prev_cpu_times_); 367 return process_.prev_load_; 368 } 369 370 int CpuSampler::GetMaxCpus() const { 371 return cpus_; 372 } 373 374 int CpuSampler::GetCurrentCpus() { 375 return sysinfo_->GetCurCpus(); 376 } 377 378 /////////////////////////////////////////////////////////////////// 379 // Implementation of class CpuMonitor. 380 CpuMonitor::CpuMonitor(Thread* thread) 381 : monitor_thread_(thread) { 382 } 383 384 CpuMonitor::~CpuMonitor() { 385 Stop(); 386 } 387 388 void CpuMonitor::set_thread(Thread* thread) { 389 ASSERT(monitor_thread_ == NULL || monitor_thread_ == thread); 390 monitor_thread_ = thread; 391 } 392 393 bool CpuMonitor::Start(int period_ms) { 394 if (!monitor_thread_ || !sampler_.Init()) return false; 395 396 monitor_thread_->SignalQueueDestroyed.connect( 397 this, &CpuMonitor::OnMessageQueueDestroyed); 398 399 period_ms_ = period_ms; 400 monitor_thread_->PostDelayed(period_ms_, this); 401 402 return true; 403 } 404 405 void CpuMonitor::Stop() { 406 if (monitor_thread_) { 407 monitor_thread_->Clear(this); 408 } 409 } 410 411 void CpuMonitor::OnMessage(Message* msg) { 412 int max_cpus = sampler_.GetMaxCpus(); 413 int current_cpus = sampler_.GetCurrentCpus(); 414 float process_load = sampler_.GetProcessLoad(); 415 float system_load = sampler_.GetSystemLoad(); 416 SignalUpdate(current_cpus, max_cpus, process_load, system_load); 417 418 if (monitor_thread_) { 419 monitor_thread_->PostDelayed(period_ms_, this); 420 } 421 } 422 423 } // namespace talk_base 424
