lib/Support/Timer.cpp

   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/ManagedStatic.h"
  17 #include "llvm/Support/Streams.h"
  18 #include "llvm/System/Process.h"
  19 #include <algorithm>
  20 #include <fstream>
  21 #include <functional>
  22 #include <map>
  23 using namespace llvm;
  24
  25 // GetLibSupportInfoOutputFile - Return a file stream to print our output on.
  26 namespace llvm { extern std::ostream *GetLibSupportInfoOutputFile(); }
  27
  28 // getLibSupportInfoOutputFilename - This ugly hack is brought to you courtesy
  29 // of constructor/destructor ordering being unspecified by C++.  Basically the
  30 // problem is that a Statistic object gets destroyed, which ends up calling
  31 // 'GetLibSupportInfoOutputFile()' (below), which calls this function.
  32 // LibSupportInfoOutputFilename used to be a global variable, but sometimes it
  33 // would get destroyed before the Statistic, causing havoc to ensue.  We "fix"
  34 // this by creating the string the first time it is needed and never destroying
  35 // it.
  36 static ManagedStatic<std::string> LibSupportInfoOutputFilename;
  37 static std::string &getLibSupportInfoOutputFilename() {
  38   return *LibSupportInfoOutputFilename;
  39 }
  40
  41 namespace {
  42   static cl::opt<bool>
  43   TrackSpace("track-memory", cl::desc("Enable -time-passes memory "
  44                                       "tracking (this may be slow)"),
  45              cl::Hidden);
  46
  47   static cl::opt<std::string, true>
  48   InfoOutputFilename("info-output-file", cl::value_desc("filename"),
  49                      cl::desc("File to append -stats and -timer output to"),
  50                    cl::Hidden, cl::location(getLibSupportInfoOutputFilename()));
  51 }
  52
  53 static TimerGroup *DefaultTimerGroup = 0;
  54 static TimerGroup *getDefaultTimerGroup() {
  55   if (DefaultTimerGroup) return DefaultTimerGroup;
  56   return DefaultTimerGroup = new TimerGroup("Miscellaneous Ungrouped Timers");
  57 }
  58
  59 Timer::Timer(const std::string &N)
  60   : Elapsed(0), UserTime(0), SystemTime(0), MemUsed(0), PeakMem(0), Name(N),
  61     Started(false), TG(getDefaultTimerGroup()) {
  62   TG->addTimer();
  63 }
  64
  65 Timer::Timer(const std::string &N, TimerGroup &tg)
  66   : Elapsed(0), UserTime(0), SystemTime(0), MemUsed(0), PeakMem(0), Name(N),
  67     Started(false), TG(&tg) {
  68   TG->addTimer();
  69 }
  70
  71 Timer::Timer(const Timer &T) {
  72   TG = T.TG;
  73   if (TG) TG->addTimer();
  74   operator=(T);
  75 }
  76
  77
  78 // Copy ctor, initialize with no TG member.
  79 Timer::Timer(bool, const Timer &T) {
  80   TG = T.TG;     // Avoid assertion in operator=
  81   operator=(T);  // Copy contents
  82   TG = 0;
  83 }
  84
  85
  86 Timer::~Timer() {
  87   if (TG) {
  88     if (Started) {
  89       Started = false;
  90       TG->addTimerToPrint(*this);
  91     }
  92     TG->removeTimer();
  93   }
  94 }
  95
  96 static inline size_t getMemUsage() {
  97   if (TrackSpace)
  98     return sys::Process::GetMallocUsage();
  99   return 0;
 100 }
 101
 102 struct TimeRecord {
 103   double Elapsed, UserTime, SystemTime;
 104   ssize_t MemUsed;
 105 };
 106
 107 static TimeRecord getTimeRecord(bool Start) {
 108   TimeRecord Result;
 109
 110   sys::TimeValue now(0,0);
 111   sys::TimeValue user(0,0);
 112   sys::TimeValue sys(0,0);
 113
 114   ssize_t MemUsed = 0;
 115   if (Start) {
 116     MemUsed = getMemUsage();
 117     sys::Process::GetTimeUsage(now,user,sys);
 118   } else {
 119     sys::Process::GetTimeUsage(now,user,sys);
 120     MemUsed = getMemUsage();
 121   }
 122
 123   Result.Elapsed  = now.seconds()  + now.microseconds()  / 1000000.0;
 124   Result.UserTime = user.seconds() + user.microseconds() / 1000000.0;
 125   Result.SystemTime  = sys.seconds()  + sys.microseconds()  / 1000000.0;
 126   Result.MemUsed  = MemUsed;
 127
 128   return Result;
 129 }
 130
 131 static ManagedStatic<std::vector<Timer*> > ActiveTimers;
 132
 133 void Timer::startTimer() {
 134   Started = true;
 135   ActiveTimers->push_back(this);
 136   TimeRecord TR = getTimeRecord(true);
 137   Elapsed    -= TR.Elapsed;
 138   UserTime   -= TR.UserTime;
 139   SystemTime -= TR.SystemTime;
 140   MemUsed    -= TR.MemUsed;
 141   PeakMemBase = TR.MemUsed;
 142 }
 143
 144 void Timer::stopTimer() {
 145   TimeRecord TR = getTimeRecord(false);
 146   Elapsed    += TR.Elapsed;
 147   UserTime   += TR.UserTime;
 148   SystemTime += TR.SystemTime;
 149   MemUsed    += TR.MemUsed;
 150
 151   if (ActiveTimers->back() == this) {
 152     ActiveTimers->pop_back();
 153   } else {
 154     std::vector<Timer*>::iterator I =
 155       std::find(ActiveTimers->begin(), ActiveTimers->end(), this);
 156     assert(I != ActiveTimers->end() && "stop but no startTimer?");
 157     ActiveTimers->erase(I);
 158   }
 159 }
 160
 161 void Timer::sum(const Timer &T) {
 162   Elapsed    += T.Elapsed;
 163   UserTime   += T.UserTime;
 164   SystemTime += T.SystemTime;
 165   MemUsed    += T.MemUsed;
 166   PeakMem    += T.PeakMem;
 167 }
 168
 169 /// addPeakMemoryMeasurement - This method should be called whenever memory
 170 /// usage needs to be checked.  It adds a peak memory measurement to the
 171 /// currently active timers, which will be printed when the timer group prints
 172 ///
 173 void Timer::addPeakMemoryMeasurement() {
 174   size_t MemUsed = getMemUsage();
 175
 176   for (std::vector<Timer*>::iterator I = ActiveTimers->begin(),
 177          E = ActiveTimers->end(); I != E; ++I)
 178     (*I)->PeakMem = std::max((*I)->PeakMem, MemUsed-(*I)->PeakMemBase);
 179 }
 180
 181 //===----------------------------------------------------------------------===//
 182 //   NamedRegionTimer Implementation
 183 //===----------------------------------------------------------------------===//
 184
 185 namespace {
 186
 187 typedef std::map<std::string, Timer> Name2Timer;
 188 typedef std::map<std::string, std::pair<TimerGroup, Name2Timer> > Name2Pair;
 189
 190 }
 191
 192 static ManagedStatic<Name2Timer> NamedTimers;
 193
 194 static ManagedStatic<Name2Pair> NamedGroupedTimers;
 195
 196 static Timer &getNamedRegionTimer(const std::string &Name) {
 197   Name2Timer::iterator I = NamedTimers->find(Name);
 198   if (I != NamedTimers->end())
 199     return I->second;
 200
 201   return NamedTimers->insert(I, std::make_pair(Name, Timer(Name)))->second;
 202 }
 203
 204 static Timer &getNamedRegionTimer(const std::string &Name,
 205                                   const std::string &GroupName) {
 206
 207   Name2Pair::iterator I = NamedGroupedTimers->find(GroupName);
 208   if (I == NamedGroupedTimers->end()) {
 209     TimerGroup TG(GroupName);
 210     std::pair<TimerGroup, Name2Timer> Pair(TG, Name2Timer());
 211     I = NamedGroupedTimers->insert(I, std::make_pair(GroupName, Pair));
 212   }
 213
 214   Name2Timer::iterator J = I->second.second.find(Name);
 215   if (J == I->second.second.end())
 216     J = I->second.second.insert(J,
 217                                 std::make_pair(Name,
 218                                                Timer(Name,
 219                                                      I->second.first)));
 220
 221   return J->second;
 222 }
 223
 224 NamedRegionTimer::NamedRegionTimer(const std::string &Name)
 225   : TimeRegion(getNamedRegionTimer(Name)) {}
 226
 227 NamedRegionTimer::NamedRegionTimer(const std::string &Name,
 228                                    const std::string &GroupName)
 229   : TimeRegion(getNamedRegionTimer(Name, GroupName)) {}
 230
 231 //===----------------------------------------------------------------------===//
 232 //   TimerGroup Implementation
 233 //===----------------------------------------------------------------------===//
 234
 235 // printAlignedFP - Simulate the printf "%A.Bf" format, where A is the
 236 // TotalWidth size, and B is the AfterDec size.
 237 //
 238 static void printAlignedFP(double Val, unsigned AfterDec, unsigned TotalWidth,
 239                            std::ostream &OS) {
 240   assert(TotalWidth >= AfterDec+1 && "Bad FP Format!");
 241   OS.width(TotalWidth-AfterDec-1);
 242   char OldFill = OS.fill();
 243   OS.fill(' ');
 244   OS << (int)Val;  // Integer part;
 245   OS << ".";
 246   OS.width(AfterDec);
 247   OS.fill('0');
 248   unsigned ResultFieldSize = 1;
 249   while (AfterDec--) ResultFieldSize *= 10;
 250   OS << (int)(Val*ResultFieldSize) % ResultFieldSize;
 251   OS.fill(OldFill);
 252 }
 253
 254 static void printVal(double Val, double Total, std::ostream &OS) {
 255   if (Total < 1e-7)   // Avoid dividing by zero...
 256     OS << "        -----     ";
 257   else {
 258     OS << "  ";
 259     printAlignedFP(Val, 4, 7, OS);
 260     OS << " (";
 261     printAlignedFP(Val*100/Total, 1, 5, OS);
 262     OS << "%)";
 263   }
 264 }
 265
 266 void Timer::print(const Timer &Total, std::ostream &OS) {
 267   if (Total.UserTime)
 268     printVal(UserTime, Total.UserTime, OS);
 269   if (Total.SystemTime)
 270     printVal(SystemTime, Total.SystemTime, OS);
 271   if (Total.getProcessTime())
 272     printVal(getProcessTime(), Total.getProcessTime(), OS);
 273   printVal(Elapsed, Total.Elapsed, OS);
 274
 275   OS << "  ";
 276
 277   if (Total.MemUsed) {
 278     OS.width(9);
 279     OS << MemUsed << "  ";
 280   }
 281   if (Total.PeakMem) {
 282     if (PeakMem) {
 283       OS.width(9);
 284       OS << PeakMem << "  ";
 285     } else
 286       OS << "           ";
 287   }
 288   OS << Name << "\n";
 289
 290   Started = false;  // Once printed, don't print again
 291 }
 292
 293 // GetLibSupportInfoOutputFile - Return a file stream to print our output on...
 294 std::ostream *
 295 llvm::GetLibSupportInfoOutputFile() {
 296   std::string &LibSupportInfoOutputFilename = getLibSupportInfoOutputFilename();
 297   if (LibSupportInfoOutputFilename.empty())
 298     return cerr.stream();
 299   if (LibSupportInfoOutputFilename == "-")
 300     return cout.stream();
 301
 302   std::ostream *Result = new std::ofstream(LibSupportInfoOutputFilename.c_str(),
 303                                            std::ios::app);
 304   if (!Result->good()) {
 305     cerr << "Error opening info-output-file '"
 306          << LibSupportInfoOutputFilename << " for appending!\n";
 307     delete Result;
 308     return cerr.stream();
 309   }
 310   return Result;
 311 }
 312
 313
 314 void TimerGroup::removeTimer() {
 315   if (--NumTimers == 0 && !TimersToPrint.empty()) { // Print timing report...
 316     // Sort the timers in descending order by amount of time taken...
 317     std::sort(TimersToPrint.begin(), TimersToPrint.end(),
 318               std::greater<Timer>());
 319
 320     // Figure out how many spaces to indent TimerGroup name...
 321     unsigned Padding = (80-Name.length())/2;
 322     if (Padding > 80) Padding = 0;         // Don't allow "negative" numbers
 323
 324     std::ostream *OutStream = GetLibSupportInfoOutputFile();
 325
 326     ++NumTimers;
 327     {  // Scope to contain Total timer... don't allow total timer to drop us to
 328        // zero timers...
 329       Timer Total("TOTAL");
 330
 331       for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
 332         Total.sum(TimersToPrint[i]);
 333
 334       // Print out timing header...
 335       *OutStream << "===" << std::string(73, '-') << "===\n"
 336                  << std::string(Padding, ' ') << Name << "\n"
 337                  << "===" << std::string(73, '-')
 338                  << "===\n";
 339
 340       // If this is not an collection of ungrouped times, print the total time.
 341       // Ungrouped timers don't really make sense to add up.  We still print the
 342       // TOTAL line to make the percentages make sense.
 343       if (this != DefaultTimerGroup) {
 344         *OutStream << "  Total Execution Time: ";
 345
 346         printAlignedFP(Total.getProcessTime(), 4, 5, *OutStream);
 347         *OutStream << " seconds (";
 348         printAlignedFP(Total.getWallTime(), 4, 5, *OutStream);
 349         *OutStream << " wall clock)\n";
 350       }
 351       *OutStream << "\n";
 352
 353       if (Total.UserTime)
 354         *OutStream << "   ---User Time---";
 355       if (Total.SystemTime)
 356         *OutStream << "   --System Time--";
 357       if (Total.getProcessTime())
 358         *OutStream << "   --User+System--";
 359       *OutStream << "   ---Wall Time---";
 360       if (Total.getMemUsed())
 361         *OutStream << "  ---Mem---";
 362       if (Total.getPeakMem())
 363         *OutStream << "  -PeakMem-";
 364       *OutStream << "  --- Name ---\n";
 365
 366       // Loop through all of the timing data, printing it out...
 367       for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
 368         TimersToPrint[i].print(Total, *OutStream);
 369
 370       Total.print(Total, *OutStream);
 371       *OutStream << std::endl;  // Flush output
 372     }
 373     --NumTimers;
 374
 375     TimersToPrint.clear();
 376
 377     if (OutStream != cerr.stream() && OutStream != cout.stream())
 378       delete OutStream;   // Close the file...
 379   }
 380
 381   // Delete default timer group!
 382   if (NumTimers == 0 && this == DefaultTimerGroup) {
 383     delete DefaultTimerGroup;
 384     DefaultTimerGroup = 0;
 385   }
 386 }
 387