Timer.cpp revision 1f6efa3996dd1929fbc129203ce5009b620e6969
1//===-- Timer.cpp - Interval Timing Support -------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// Interval Timing implementation. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/Support/Timer.h" 15#include "llvm/Support/CommandLine.h" 16#include "llvm/Support/Debug.h" 17#include "llvm/Support/ManagedStatic.h" 18#include "llvm/Support/raw_ostream.h" 19#include "llvm/Support/Format.h" 20#include "llvm/Support/Mutex.h" 21#include "llvm/Support/Process.h" 22#include "llvm/ADT/OwningPtr.h" 23#include "llvm/ADT/StringMap.h" 24using namespace llvm; 25 26// CreateInfoOutputFile - Return a file stream to print our output on. 27namespace llvm { extern raw_ostream *CreateInfoOutputFile(); } 28 29// getLibSupportInfoOutputFilename - This ugly hack is brought to you courtesy 30// of constructor/destructor ordering being unspecified by C++. Basically the 31// problem is that a Statistic object gets destroyed, which ends up calling 32// 'GetLibSupportInfoOutputFile()' (below), which calls this function. 33// LibSupportInfoOutputFilename used to be a global variable, but sometimes it 34// would get destroyed before the Statistic, causing havoc to ensue. We "fix" 35// this by creating the string the first time it is needed and never destroying 36// it. 37static ManagedStatic<std::string> LibSupportInfoOutputFilename; 38static std::string &getLibSupportInfoOutputFilename() { 39 return *LibSupportInfoOutputFilename; 40} 41 42static ManagedStatic<sys::SmartMutex<true> > TimerLock; 43 44namespace { 45 static cl::opt<bool> 46 TrackSpace("track-memory", cl::desc("Enable -time-passes memory " 47 "tracking (this may be slow)"), 48 cl::Hidden); 49 50 static cl::opt<std::string, true> 51 InfoOutputFilename("info-output-file", cl::value_desc("filename"), 52 cl::desc("File to append -stats and -timer output to"), 53 cl::Hidden, cl::location(getLibSupportInfoOutputFilename())); 54} 55 56// CreateInfoOutputFile - Return a file stream to print our output on. 57raw_ostream *llvm::CreateInfoOutputFile() { 58 const std::string &OutputFilename = getLibSupportInfoOutputFilename(); 59 if (OutputFilename.empty()) 60 return new raw_fd_ostream(2, false); // stderr. 61 if (OutputFilename == "-") 62 return new raw_fd_ostream(1, false); // stdout. 63 64 // Append mode is used because the info output file is opened and closed 65 // each time -stats or -time-passes wants to print output to it. To 66 // compensate for this, the test-suite Makefiles have code to delete the 67 // info output file before running commands which write to it. 68 std::string Error; 69 raw_ostream *Result = new raw_fd_ostream(OutputFilename.c_str(), 70 Error, raw_fd_ostream::F_Append); 71 if (Error.empty()) 72 return Result; 73 74 errs() << "Error opening info-output-file '" 75 << OutputFilename << " for appending!\n"; 76 delete Result; 77 return new raw_fd_ostream(2, false); // stderr. 78} 79 80 81static TimerGroup *DefaultTimerGroup = 0; 82static TimerGroup *getDefaultTimerGroup() { 83 TimerGroup *tmp = DefaultTimerGroup; 84 sys::MemoryFence(); 85 if (tmp) return tmp; 86 87 llvm_acquire_global_lock(); 88 tmp = DefaultTimerGroup; 89 if (!tmp) { 90 tmp = new TimerGroup("Miscellaneous Ungrouped Timers"); 91 sys::MemoryFence(); 92 DefaultTimerGroup = tmp; 93 } 94 llvm_release_global_lock(); 95 96 return tmp; 97} 98 99//===----------------------------------------------------------------------===// 100// Timer Implementation 101//===----------------------------------------------------------------------===// 102 103void Timer::init(StringRef N) { 104 assert(TG == 0 && "Timer already initialized"); 105 Name.assign(N.begin(), N.end()); 106 Started = false; 107 TG = getDefaultTimerGroup(); 108 TG->addTimer(*this); 109} 110 111void Timer::init(StringRef N, TimerGroup &tg) { 112 assert(TG == 0 && "Timer already initialized"); 113 Name.assign(N.begin(), N.end()); 114 Started = false; 115 TG = &tg; 116 TG->addTimer(*this); 117} 118 119Timer::~Timer() { 120 if (!TG) return; // Never initialized, or already cleared. 121 TG->removeTimer(*this); 122} 123 124static inline size_t getMemUsage() { 125 if (!TrackSpace) return 0; 126 return sys::Process::GetMallocUsage(); 127} 128 129TimeRecord TimeRecord::getCurrentTime(bool Start) { 130 TimeRecord Result; 131 sys::TimeValue now(0,0), user(0,0), sys(0,0); 132 133 if (Start) { 134 Result.MemUsed = getMemUsage(); 135 sys::Process::GetTimeUsage(now, user, sys); 136 } else { 137 sys::Process::GetTimeUsage(now, user, sys); 138 Result.MemUsed = getMemUsage(); 139 } 140 141 Result.WallTime = now.seconds() + now.microseconds() / 1000000.0; 142 Result.UserTime = user.seconds() + user.microseconds() / 1000000.0; 143 Result.SystemTime = sys.seconds() + sys.microseconds() / 1000000.0; 144 return Result; 145} 146 147static ManagedStatic<std::vector<Timer*> > ActiveTimers; 148 149void Timer::startTimer() { 150 Started = true; 151 ActiveTimers->push_back(this); 152 Time -= TimeRecord::getCurrentTime(true); 153} 154 155void Timer::stopTimer() { 156 Time += TimeRecord::getCurrentTime(false); 157 158 if (ActiveTimers->back() == this) { 159 ActiveTimers->pop_back(); 160 } else { 161 std::vector<Timer*>::iterator I = 162 std::find(ActiveTimers->begin(), ActiveTimers->end(), this); 163 assert(I != ActiveTimers->end() && "stop but no startTimer?"); 164 ActiveTimers->erase(I); 165 } 166} 167 168static void printVal(double Val, double Total, raw_ostream &OS) { 169 if (Total < 1e-7) // Avoid dividing by zero. 170 OS << " ----- "; 171 else { 172 OS << " " << format("%7.4f", Val) << " ("; 173 OS << format("%5.1f", Val*100/Total) << "%)"; 174 } 175} 176 177void TimeRecord::print(const TimeRecord &Total, raw_ostream &OS) const { 178 if (Total.getUserTime()) 179 printVal(getUserTime(), Total.getUserTime(), OS); 180 if (Total.getSystemTime()) 181 printVal(getSystemTime(), Total.getSystemTime(), OS); 182 if (Total.getProcessTime()) 183 printVal(getProcessTime(), Total.getProcessTime(), OS); 184 printVal(getWallTime(), Total.getWallTime(), OS); 185 186 OS << " "; 187 188 if (Total.getMemUsed()) 189 OS << format("%9lld", (long long)getMemUsed()) << " "; 190} 191 192 193//===----------------------------------------------------------------------===// 194// NamedRegionTimer Implementation 195//===----------------------------------------------------------------------===// 196 197namespace { 198 199typedef StringMap<Timer> Name2TimerMap; 200 201class Name2PairMap { 202 StringMap<std::pair<TimerGroup*, Name2TimerMap> > Map; 203public: 204 ~Name2PairMap() { 205 for (StringMap<std::pair<TimerGroup*, Name2TimerMap> >::iterator 206 I = Map.begin(), E = Map.end(); I != E; ++I) 207 delete I->second.first; 208 } 209 210 Timer &get(StringRef Name, StringRef GroupName) { 211 sys::SmartScopedLock<true> L(*TimerLock); 212 213 std::pair<TimerGroup*, Name2TimerMap> &GroupEntry = Map[GroupName]; 214 215 if (!GroupEntry.first) 216 GroupEntry.first = new TimerGroup(GroupName); 217 218 Timer &T = GroupEntry.second[Name]; 219 if (!T.isInitialized()) 220 T.init(Name, *GroupEntry.first); 221 return T; 222 } 223}; 224 225} 226 227static ManagedStatic<Name2TimerMap> NamedTimers; 228static ManagedStatic<Name2PairMap> NamedGroupedTimers; 229 230static Timer &getNamedRegionTimer(StringRef Name) { 231 sys::SmartScopedLock<true> L(*TimerLock); 232 233 Timer &T = (*NamedTimers)[Name]; 234 if (!T.isInitialized()) 235 T.init(Name); 236 return T; 237} 238 239NamedRegionTimer::NamedRegionTimer(StringRef Name, 240 bool Enabled) 241 : TimeRegion(!Enabled ? 0 : &getNamedRegionTimer(Name)) {} 242 243NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef GroupName, 244 bool Enabled) 245 : TimeRegion(!Enabled ? 0 : &NamedGroupedTimers->get(Name, GroupName)) {} 246 247//===----------------------------------------------------------------------===// 248// TimerGroup Implementation 249//===----------------------------------------------------------------------===// 250 251/// TimerGroupList - This is the global list of TimerGroups, maintained by the 252/// TimerGroup ctor/dtor and is protected by the TimerLock lock. 253static TimerGroup *TimerGroupList = 0; 254 255TimerGroup::TimerGroup(StringRef name) 256 : Name(name.begin(), name.end()), FirstTimer(0) { 257 258 // Add the group to TimerGroupList. 259 sys::SmartScopedLock<true> L(*TimerLock); 260 if (TimerGroupList) 261 TimerGroupList->Prev = &Next; 262 Next = TimerGroupList; 263 Prev = &TimerGroupList; 264 TimerGroupList = this; 265} 266 267TimerGroup::~TimerGroup() { 268 // If the timer group is destroyed before the timers it owns, accumulate and 269 // print the timing data. 270 while (FirstTimer != 0) 271 removeTimer(*FirstTimer); 272 273 // Remove the group from the TimerGroupList. 274 sys::SmartScopedLock<true> L(*TimerLock); 275 *Prev = Next; 276 if (Next) 277 Next->Prev = Prev; 278} 279 280 281void TimerGroup::removeTimer(Timer &T) { 282 sys::SmartScopedLock<true> L(*TimerLock); 283 284 // If the timer was started, move its data to TimersToPrint. 285 if (T.Started) 286 TimersToPrint.push_back(std::make_pair(T.Time, T.Name)); 287 288 T.TG = 0; 289 290 // Unlink the timer from our list. 291 *T.Prev = T.Next; 292 if (T.Next) 293 T.Next->Prev = T.Prev; 294 295 // Print the report when all timers in this group are destroyed if some of 296 // them were started. 297 if (FirstTimer != 0 || TimersToPrint.empty()) 298 return; 299 300 raw_ostream *OutStream = CreateInfoOutputFile(); 301 PrintQueuedTimers(*OutStream); 302 delete OutStream; // Close the file. 303} 304 305void TimerGroup::addTimer(Timer &T) { 306 sys::SmartScopedLock<true> L(*TimerLock); 307 308 // Add the timer to our list. 309 if (FirstTimer) 310 FirstTimer->Prev = &T.Next; 311 T.Next = FirstTimer; 312 T.Prev = &FirstTimer; 313 FirstTimer = &T; 314} 315 316void TimerGroup::PrintQueuedTimers(raw_ostream &OS) { 317 // Sort the timers in descending order by amount of time taken. 318 std::sort(TimersToPrint.begin(), TimersToPrint.end()); 319 320 TimeRecord Total; 321 for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i) 322 Total += TimersToPrint[i].first; 323 324 // Print out timing header. 325 OS << "===" << std::string(73, '-') << "===\n"; 326 // Figure out how many spaces to indent TimerGroup name. 327 unsigned Padding = (80-Name.length())/2; 328 if (Padding > 80) Padding = 0; // Don't allow "negative" numbers 329 OS.indent(Padding) << Name << '\n'; 330 OS << "===" << std::string(73, '-') << "===\n"; 331 332 // If this is not an collection of ungrouped times, print the total time. 333 // Ungrouped timers don't really make sense to add up. We still print the 334 // TOTAL line to make the percentages make sense. 335 if (this != DefaultTimerGroup) { 336 OS << " Total Execution Time: "; 337 OS << format("%5.4f", Total.getProcessTime()) << " seconds ("; 338 OS << format("%5.4f", Total.getWallTime()) << " wall clock)\n"; 339 } 340 OS << '\n'; 341 342 if (Total.getUserTime()) 343 OS << " ---User Time---"; 344 if (Total.getSystemTime()) 345 OS << " --System Time--"; 346 if (Total.getProcessTime()) 347 OS << " --User+System--"; 348 OS << " ---Wall Time---"; 349 if (Total.getMemUsed()) 350 OS << " ---Mem---"; 351 OS << " --- Name ---\n"; 352 353 // Loop through all of the timing data, printing it out. 354 for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i) { 355 const std::pair<TimeRecord, std::string> &Entry = TimersToPrint[e-i-1]; 356 Entry.first.print(Total, OS); 357 OS << Entry.second << '\n'; 358 } 359 360 Total.print(Total, OS); 361 OS << "Total\n\n"; 362 OS.flush(); 363 364 TimersToPrint.clear(); 365} 366 367/// print - Print any started timers in this group and zero them. 368void TimerGroup::print(raw_ostream &OS) { 369 sys::SmartScopedLock<true> L(*TimerLock); 370 371 // See if any of our timers were started, if so add them to TimersToPrint and 372 // reset them. 373 for (Timer *T = FirstTimer; T; T = T->Next) { 374 if (!T->Started) continue; 375 TimersToPrint.push_back(std::make_pair(T->Time, T->Name)); 376 377 // Clear out the time. 378 T->Started = 0; 379 T->Time = TimeRecord(); 380 } 381 382 // If any timers were started, print the group. 383 if (!TimersToPrint.empty()) 384 PrintQueuedTimers(OS); 385} 386 387/// printAll - This static method prints all timers and clears them all out. 388void TimerGroup::printAll(raw_ostream &OS) { 389 sys::SmartScopedLock<true> L(*TimerLock); 390 391 for (TimerGroup *TG = TimerGroupList; TG; TG = TG->Next) 392 TG->print(OS); 393} 394