llvm.org GIT mirror llvm / release_40 lib / Support / Timer.cpp
release_40

Tree @release_40 (Download .tar.gz)

Timer.cpp @release_40raw · history · blame

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
//===-- Timer.cpp - Interval Timing Support -------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
/// \file Interval Timing implementation.
//
//===----------------------------------------------------------------------===//

#include "llvm/Support/Timer.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Mutex.h"
#include "llvm/Support/Process.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/YAMLTraits.h"
using namespace llvm;

// This ugly hack is brought to you courtesy of constructor/destructor ordering
// being unspecified by C++.  Basically the problem is that a Statistic object
// gets destroyed, which ends up calling 'GetLibSupportInfoOutputFile()'
// (below), which calls this function.  LibSupportInfoOutputFilename used to be
// a global variable, but sometimes it would get destroyed before the Statistic,
// causing havoc to ensue.  We "fix" this by creating the string the first time
// it is needed and never destroying it.
static ManagedStatic<std::string> LibSupportInfoOutputFilename;
static std::string &getLibSupportInfoOutputFilename() {
  return *LibSupportInfoOutputFilename;
}

static ManagedStatic<sys::SmartMutex<true> > TimerLock;

namespace {
  static cl::opt<bool>
  TrackSpace("track-memory", cl::desc("Enable -time-passes memory "
                                      "tracking (this may be slow)"),
             cl::Hidden);

  static cl::opt<std::string, true>
  InfoOutputFilename("info-output-file", cl::value_desc("filename"),
                     cl::desc("File to append -stats and -timer output to"),
                   cl::Hidden, cl::location(getLibSupportInfoOutputFilename()));
}

std::unique_ptr<raw_fd_ostream> llvm::CreateInfoOutputFile() {
  const std::string &OutputFilename = getLibSupportInfoOutputFilename();
  if (OutputFilename.empty())
    return llvm::make_unique<raw_fd_ostream>(2, false); // stderr.
  if (OutputFilename == "-")
    return llvm::make_unique<raw_fd_ostream>(1, false); // stdout.

  // Append mode is used because the info output file is opened and closed
  // each time -stats or -time-passes wants to print output to it. To
  // compensate for this, the test-suite Makefiles have code to delete the
  // info output file before running commands which write to it.
  std::error_code EC;
  auto Result = llvm::make_unique<raw_fd_ostream>(
      OutputFilename, EC, sys::fs::F_Append | sys::fs::F_Text);
  if (!EC)
    return Result;

  errs() << "Error opening info-output-file '"
    << OutputFilename << " for appending!\n";
  return llvm::make_unique<raw_fd_ostream>(2, false); // stderr.
}


static TimerGroup *DefaultTimerGroup = nullptr;
static TimerGroup *getDefaultTimerGroup() {
  TimerGroup *tmp = DefaultTimerGroup;
  sys::MemoryFence();
  if (tmp) return tmp;

  sys::SmartScopedLock<true> Lock(*TimerLock);
  tmp = DefaultTimerGroup;
  if (!tmp) {
    tmp = new TimerGroup("misc", "Miscellaneous Ungrouped Timers");
    sys::MemoryFence();
    DefaultTimerGroup = tmp;
  }

  return tmp;
}

//===----------------------------------------------------------------------===//
// Timer Implementation
//===----------------------------------------------------------------------===//

void Timer::init(StringRef Name, StringRef Description) {
  init(Name, Description, *getDefaultTimerGroup());
}

void Timer::init(StringRef Name, StringRef Description, TimerGroup &tg) {
  assert(!TG && "Timer already initialized");
  this->Name.assign(Name.begin(), Name.end());
  this->Description.assign(Description.begin(), Description.end());
  Running = Triggered = false;
  TG = &tg;
  TG->addTimer(*this);
}

Timer::~Timer() {
  if (!TG) return;  // Never initialized, or already cleared.
  TG->removeTimer(*this);
}

static inline size_t getMemUsage() {
  if (!TrackSpace) return 0;
  return sys::Process::GetMallocUsage();
}

TimeRecord TimeRecord::getCurrentTime(bool Start) {
  using Seconds = std::chrono::duration<double, std::ratio<1>>;
  TimeRecord Result;
  sys::TimePoint<> now;
  std::chrono::nanoseconds user, sys;

  if (Start) {
    Result.MemUsed = getMemUsage();
    sys::Process::GetTimeUsage(now, user, sys);
  } else {
    sys::Process::GetTimeUsage(now, user, sys);
    Result.MemUsed = getMemUsage();
  }

  Result.WallTime = Seconds(now.time_since_epoch()).count();
  Result.UserTime = Seconds(user).count();
  Result.SystemTime = Seconds(sys).count();
  return Result;
}

void Timer::startTimer() {
  assert(!Running && "Cannot start a running timer");
  Running = Triggered = true;
  StartTime = TimeRecord::getCurrentTime(true);
}

void Timer::stopTimer() {
  assert(Running && "Cannot stop a paused timer");
  Running = false;
  Time += TimeRecord::getCurrentTime(false);
  Time -= StartTime;
}

void Timer::clear() {
  Running = Triggered = false;
  Time = StartTime = TimeRecord();
}

static void printVal(double Val, double Total, raw_ostream &OS) {
  if (Total < 1e-7)   // Avoid dividing by zero.
    OS << "        -----     ";
  else
    OS << format("  %7.4f (%5.1f%%)", Val, Val*100/Total);
}

void TimeRecord::print(const TimeRecord &Total, raw_ostream &OS) const {
  if (Total.getUserTime())
    printVal(getUserTime(), Total.getUserTime(), OS);
  if (Total.getSystemTime())
    printVal(getSystemTime(), Total.getSystemTime(), OS);
  if (Total.getProcessTime())
    printVal(getProcessTime(), Total.getProcessTime(), OS);
  printVal(getWallTime(), Total.getWallTime(), OS);

  OS << "  ";

  if (Total.getMemUsed())
    OS << format("%9" PRId64 "  ", (int64_t)getMemUsed());
}


//===----------------------------------------------------------------------===//
//   NamedRegionTimer Implementation
//===----------------------------------------------------------------------===//

namespace {

typedef StringMap<Timer> Name2TimerMap;

class Name2PairMap {
  StringMap<std::pair<TimerGroup*, Name2TimerMap> > Map;
public:
  ~Name2PairMap() {
    for (StringMap<std::pair<TimerGroup*, Name2TimerMap> >::iterator
         I = Map.begin(), E = Map.end(); I != E; ++I)
      delete I->second.first;
  }

  Timer &get(StringRef Name, StringRef Description, StringRef GroupName,
             StringRef GroupDescription) {
    sys::SmartScopedLock<true> L(*TimerLock);

    std::pair<TimerGroup*, Name2TimerMap> &GroupEntry = Map[GroupName];

    if (!GroupEntry.first)
      GroupEntry.first = new TimerGroup(GroupName, GroupDescription);

    Timer &T = GroupEntry.second[Name];
    if (!T.isInitialized())
      T.init(Name, Description, *GroupEntry.first);
    return T;
  }
};

}

static ManagedStatic<Name2PairMap> NamedGroupedTimers;

NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef Description,
                                   StringRef GroupName,
                                   StringRef GroupDescription, bool Enabled)
  : TimeRegion(!Enabled ? nullptr
                 : &NamedGroupedTimers->get(Name, Description, GroupName,
                                            GroupDescription)) {}

//===----------------------------------------------------------------------===//
//   TimerGroup Implementation
//===----------------------------------------------------------------------===//

/// This is the global list of TimerGroups, maintained by the TimerGroup
/// ctor/dtor and is protected by the TimerLock lock.
static TimerGroup *TimerGroupList = nullptr;

TimerGroup::TimerGroup(StringRef Name, StringRef Description)
  : Name(Name.begin(), Name.end()),
    Description(Description.begin(), Description.end()) {
  // Add the group to TimerGroupList.
  sys::SmartScopedLock<true> L(*TimerLock);
  if (TimerGroupList)
    TimerGroupList->Prev = &Next;
  Next = TimerGroupList;
  Prev = &TimerGroupList;
  TimerGroupList = this;
}

TimerGroup::~TimerGroup() {
  // If the timer group is destroyed before the timers it owns, accumulate and
  // print the timing data.
  while (FirstTimer)
    removeTimer(*FirstTimer);

  // Remove the group from the TimerGroupList.
  sys::SmartScopedLock<true> L(*TimerLock);
  *Prev = Next;
  if (Next)
    Next->Prev = Prev;
}


void TimerGroup::removeTimer(Timer &T) {
  sys::SmartScopedLock<true> L(*TimerLock);

  // If the timer was started, move its data to TimersToPrint.
  if (T.hasTriggered())
    TimersToPrint.emplace_back(T.Time, T.Name, T.Description);

  T.TG = nullptr;

  // Unlink the timer from our list.
  *T.Prev = T.Next;
  if (T.Next)
    T.Next->Prev = T.Prev;

  // Print the report when all timers in this group are destroyed if some of
  // them were started.
  if (FirstTimer || TimersToPrint.empty())
    return;

  std::unique_ptr<raw_ostream> OutStream = CreateInfoOutputFile();
  PrintQueuedTimers(*OutStream);
}

void TimerGroup::addTimer(Timer &T) {
  sys::SmartScopedLock<true> L(*TimerLock);

  // Add the timer to our list.
  if (FirstTimer)
    FirstTimer->Prev = &T.Next;
  T.Next = FirstTimer;
  T.Prev = &FirstTimer;
  FirstTimer = &T;
}

void TimerGroup::PrintQueuedTimers(raw_ostream &OS) {
  // Sort the timers in descending order by amount of time taken.
  std::sort(TimersToPrint.begin(), TimersToPrint.end());

  TimeRecord Total;
  for (const PrintRecord &Record : TimersToPrint)
    Total += Record.Time;

  // Print out timing header.
  OS << "===" << std::string(73, '-') << "===\n";
  // Figure out how many spaces to indent TimerGroup name.
  unsigned Padding = (80-Description.length())/2;
  if (Padding > 80) Padding = 0;         // Don't allow "negative" numbers
  OS.indent(Padding) << Description << '\n';
  OS << "===" << std::string(73, '-') << "===\n";

  // If this is not an collection of ungrouped times, print the total time.
  // Ungrouped timers don't really make sense to add up.  We still print the
  // TOTAL line to make the percentages make sense.
  if (this != DefaultTimerGroup)
    OS << format("  Total Execution Time: %5.4f seconds (%5.4f wall clock)\n",
                 Total.getProcessTime(), Total.getWallTime());
  OS << '\n';

  if (Total.getUserTime())
    OS << "   ---User Time---";
  if (Total.getSystemTime())
    OS << "   --System Time--";
  if (Total.getProcessTime())
    OS << "   --User+System--";
  OS << "   ---Wall Time---";
  if (Total.getMemUsed())
    OS << "  ---Mem---";
  OS << "  --- Name ---\n";

  // Loop through all of the timing data, printing it out.
  for (const PrintRecord &Record : make_range(TimersToPrint.rbegin(),
                                              TimersToPrint.rend())) {
    Record.Time.print(Total, OS);
    OS << Record.Description << '\n';
  }

  Total.print(Total, OS);
  OS << "Total\n\n";
  OS.flush();

  TimersToPrint.clear();
}

void TimerGroup::prepareToPrintList() {
  // See if any of our timers were started, if so add them to TimersToPrint and
  // reset them.
  for (Timer *T = FirstTimer; T; T = T->Next) {
    if (!T->hasTriggered()) continue;
    TimersToPrint.emplace_back(T->Time, T->Name, T->Description);

    // Clear out the time.
    T->clear();
  }
}

void TimerGroup::print(raw_ostream &OS) {
  sys::SmartScopedLock<true> L(*TimerLock);

  prepareToPrintList();

  // If any timers were started, print the group.
  if (!TimersToPrint.empty())
    PrintQueuedTimers(OS);
}

void TimerGroup::printAll(raw_ostream &OS) {
  sys::SmartScopedLock<true> L(*TimerLock);

  for (TimerGroup *TG = TimerGroupList; TG; TG = TG->Next)
    TG->print(OS);
}

void TimerGroup::printJSONValue(raw_ostream &OS, const PrintRecord &R,
                                const char *suffix, double Value) {
  assert(!yaml::needsQuotes(Name) && "TimerGroup name needs no quotes");
  assert(!yaml::needsQuotes(R.Name) && "Timer name needs no quotes");
  OS << "\t\"time." << Name << '.' << R.Name << suffix << "\": " << Value;
}

const char *TimerGroup::printJSONValues(raw_ostream &OS, const char *delim) {
  prepareToPrintList();
  for (const PrintRecord &R : TimersToPrint) {
    OS << delim;
    delim = ",\n";

    const TimeRecord &T = R.Time;
    printJSONValue(OS, R, ".wall", T.getWallTime());
    OS << delim;
    printJSONValue(OS, R, ".user", T.getUserTime());
    OS << delim;
    printJSONValue(OS, R, ".sys", T.getSystemTime());
  }
  TimersToPrint.clear();
  return delim;
}

const char *TimerGroup::printAllJSONValues(raw_ostream &OS, const char *delim) {
  sys::SmartScopedLock<true> L(*TimerLock);
  for (TimerGroup *TG = TimerGroupList; TG; TG = TG->Next)
    delim = TG->printJSONValues(OS, delim);
  return delim;
}

void TimerGroup::ConstructTimerLists() {
  (void)*NamedGroupedTimers;
}