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46d9a64944
but should work on all the platforms we care about. I might revisit this if a totally awesome way to do it occurs to me. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74002 91177308-0d34-0410-b5e6-96231b3b80d8
446 lines
13 KiB
C++
446 lines
13 KiB
C++
//===-- Timer.cpp - Interval Timing Support -------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Interval Timing implementation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Timer.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Streams.h"
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#include "llvm/System/Process.h"
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#include <algorithm>
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#include <fstream>
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#include <functional>
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#include <map>
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using namespace llvm;
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// GetLibSupportInfoOutputFile - Return a file stream to print our output on.
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namespace llvm { extern std::ostream *GetLibSupportInfoOutputFile(); }
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// getLibSupportInfoOutputFilename - This ugly hack is brought to you courtesy
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// of constructor/destructor ordering being unspecified by C++. Basically the
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// problem is that a Statistic object gets destroyed, which ends up calling
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// 'GetLibSupportInfoOutputFile()' (below), which calls this function.
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// LibSupportInfoOutputFilename used to be a global variable, but sometimes it
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// would get destroyed before the Statistic, causing havoc to ensue. We "fix"
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// this by creating the string the first time it is needed and never destroying
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// it.
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static ManagedStatic<std::string> LibSupportInfoOutputFilename;
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static std::string &getLibSupportInfoOutputFilename() {
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return *LibSupportInfoOutputFilename;
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}
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static ManagedStatic<sys::SmartMutex<true> > TimerLock;
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namespace {
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static cl::opt<bool>
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TrackSpace("track-memory", cl::desc("Enable -time-passes memory "
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"tracking (this may be slow)"),
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cl::Hidden);
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static cl::opt<std::string, true>
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InfoOutputFilename("info-output-file", cl::value_desc("filename"),
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cl::desc("File to append -stats and -timer output to"),
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cl::Hidden, cl::location(getLibSupportInfoOutputFilename()));
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}
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static TimerGroup *DefaultTimerGroup = 0;
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static TimerGroup *getDefaultTimerGroup() {
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TimerGroup* tmp = DefaultTimerGroup;
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sys::MemoryFence();
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if (!tmp) {
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llvm_acquire_global_lock();
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tmp = DefaultTimerGroup;
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if (!tmp) {
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tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
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sys::MemoryFence();
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DefaultTimerGroup = tmp;
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}
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llvm_release_global_lock();
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}
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return tmp;
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}
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Timer::Timer(const std::string &N)
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: Elapsed(0), UserTime(0), SystemTime(0), MemUsed(0), PeakMem(0), Name(N),
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Started(false), TG(getDefaultTimerGroup()) {
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TG->addTimer();
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}
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Timer::Timer(const std::string &N, TimerGroup &tg)
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: Elapsed(0), UserTime(0), SystemTime(0), MemUsed(0), PeakMem(0), Name(N),
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Started(false), TG(&tg) {
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TG->addTimer();
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}
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Timer::Timer(const Timer &T) {
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TG = T.TG;
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if (TG) TG->addTimer();
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operator=(T);
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}
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// Copy ctor, initialize with no TG member.
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Timer::Timer(bool, const Timer &T) {
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TG = T.TG; // Avoid assertion in operator=
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operator=(T); // Copy contents
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TG = 0;
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}
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Timer::~Timer() {
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if (TG) {
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if (Started) {
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Started = false;
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TG->addTimerToPrint(*this);
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}
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TG->removeTimer();
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}
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}
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static inline size_t getMemUsage() {
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if (TrackSpace)
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return sys::Process::GetMallocUsage();
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return 0;
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}
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struct TimeRecord {
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double Elapsed, UserTime, SystemTime;
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ssize_t MemUsed;
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};
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static TimeRecord getTimeRecord(bool Start) {
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TimeRecord Result;
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sys::TimeValue now(0,0);
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sys::TimeValue user(0,0);
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sys::TimeValue sys(0,0);
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ssize_t MemUsed = 0;
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if (Start) {
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MemUsed = getMemUsage();
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sys::Process::GetTimeUsage(now,user,sys);
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} else {
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sys::Process::GetTimeUsage(now,user,sys);
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MemUsed = getMemUsage();
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}
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Result.Elapsed = now.seconds() + now.microseconds() / 1000000.0;
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Result.UserTime = user.seconds() + user.microseconds() / 1000000.0;
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Result.SystemTime = sys.seconds() + sys.microseconds() / 1000000.0;
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Result.MemUsed = MemUsed;
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return Result;
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}
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static ManagedStatic<std::vector<Timer*> > ActiveTimers;
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void Timer::startTimer() {
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sys::SmartScopedLock<true> L(&Lock);
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Started = true;
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ActiveTimers->push_back(this);
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TimeRecord TR = getTimeRecord(true);
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Elapsed -= TR.Elapsed;
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UserTime -= TR.UserTime;
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SystemTime -= TR.SystemTime;
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MemUsed -= TR.MemUsed;
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PeakMemBase = TR.MemUsed;
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}
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void Timer::stopTimer() {
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sys::SmartScopedLock<true> L(&Lock);
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TimeRecord TR = getTimeRecord(false);
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Elapsed += TR.Elapsed;
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UserTime += TR.UserTime;
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SystemTime += TR.SystemTime;
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MemUsed += TR.MemUsed;
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if (ActiveTimers->back() == this) {
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ActiveTimers->pop_back();
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} else {
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std::vector<Timer*>::iterator I =
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std::find(ActiveTimers->begin(), ActiveTimers->end(), this);
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assert(I != ActiveTimers->end() && "stop but no startTimer?");
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ActiveTimers->erase(I);
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}
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}
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void Timer::sum(const Timer &T) {
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if (&T < this) {
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T.Lock.acquire();
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Lock.acquire();
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} else {
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Lock.acquire();
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T.Lock.acquire();
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}
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Elapsed += T.Elapsed;
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UserTime += T.UserTime;
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SystemTime += T.SystemTime;
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MemUsed += T.MemUsed;
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PeakMem += T.PeakMem;
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if (&T < this) {
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T.Lock.release();
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Lock.release();
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} else {
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Lock.release();
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T.Lock.release();
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}
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}
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/// addPeakMemoryMeasurement - This method should be called whenever memory
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/// usage needs to be checked. It adds a peak memory measurement to the
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/// currently active timers, which will be printed when the timer group prints
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///
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void Timer::addPeakMemoryMeasurement() {
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size_t MemUsed = getMemUsage();
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for (std::vector<Timer*>::iterator I = ActiveTimers->begin(),
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E = ActiveTimers->end(); I != E; ++I) {
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(*I)->Lock.acquire();
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(*I)->PeakMem = std::max((*I)->PeakMem, MemUsed-(*I)->PeakMemBase);
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(*I)->Lock.release();
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}
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}
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//===----------------------------------------------------------------------===//
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// NamedRegionTimer Implementation
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//===----------------------------------------------------------------------===//
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namespace {
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typedef std::map<std::string, Timer> Name2Timer;
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typedef std::map<std::string, std::pair<TimerGroup, Name2Timer> > Name2Pair;
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}
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static ManagedStatic<Name2Timer> NamedTimers;
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static ManagedStatic<Name2Pair> NamedGroupedTimers;
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static Timer &getNamedRegionTimer(const std::string &Name) {
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sys::SmartScopedLock<true> L(&*TimerLock);
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Name2Timer::iterator I = NamedTimers->find(Name);
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if (I != NamedTimers->end())
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return I->second;
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return NamedTimers->insert(I, std::make_pair(Name, Timer(Name)))->second;
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}
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static Timer &getNamedRegionTimer(const std::string &Name,
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const std::string &GroupName) {
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sys::SmartScopedLock<true> L(&*TimerLock);
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Name2Pair::iterator I = NamedGroupedTimers->find(GroupName);
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if (I == NamedGroupedTimers->end()) {
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TimerGroup TG(GroupName);
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std::pair<TimerGroup, Name2Timer> Pair(TG, Name2Timer());
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I = NamedGroupedTimers->insert(I, std::make_pair(GroupName, Pair));
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}
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Name2Timer::iterator J = I->second.second.find(Name);
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if (J == I->second.second.end())
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J = I->second.second.insert(J,
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std::make_pair(Name,
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Timer(Name,
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I->second.first)));
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return J->second;
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}
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NamedRegionTimer::NamedRegionTimer(const std::string &Name)
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: TimeRegion(getNamedRegionTimer(Name)) {}
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NamedRegionTimer::NamedRegionTimer(const std::string &Name,
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const std::string &GroupName)
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: TimeRegion(getNamedRegionTimer(Name, GroupName)) {}
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//===----------------------------------------------------------------------===//
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// TimerGroup Implementation
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//===----------------------------------------------------------------------===//
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// printAlignedFP - Simulate the printf "%A.Bf" format, where A is the
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// TotalWidth size, and B is the AfterDec size.
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//
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static void printAlignedFP(double Val, unsigned AfterDec, unsigned TotalWidth,
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std::ostream &OS) {
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assert(TotalWidth >= AfterDec+1 && "Bad FP Format!");
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OS.width(TotalWidth-AfterDec-1);
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char OldFill = OS.fill();
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OS.fill(' ');
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OS << (int)Val; // Integer part;
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OS << ".";
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OS.width(AfterDec);
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OS.fill('0');
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unsigned ResultFieldSize = 1;
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while (AfterDec--) ResultFieldSize *= 10;
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OS << (int)(Val*ResultFieldSize) % ResultFieldSize;
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OS.fill(OldFill);
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}
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static void printVal(double Val, double Total, std::ostream &OS) {
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if (Total < 1e-7) // Avoid dividing by zero...
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OS << " ----- ";
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else {
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OS << " ";
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printAlignedFP(Val, 4, 7, OS);
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OS << " (";
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printAlignedFP(Val*100/Total, 1, 5, OS);
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OS << "%)";
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}
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}
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void Timer::print(const Timer &Total, std::ostream &OS) {
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if (&Total < this) {
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Total.Lock.acquire();
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Lock.acquire();
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} else {
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Lock.acquire();
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Total.Lock.acquire();
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}
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if (Total.UserTime)
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printVal(UserTime, Total.UserTime, OS);
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if (Total.SystemTime)
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printVal(SystemTime, Total.SystemTime, OS);
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if (Total.getProcessTime())
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printVal(getProcessTime(), Total.getProcessTime(), OS);
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printVal(Elapsed, Total.Elapsed, OS);
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OS << " ";
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if (Total.MemUsed) {
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OS.width(9);
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OS << MemUsed << " ";
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}
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if (Total.PeakMem) {
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if (PeakMem) {
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OS.width(9);
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OS << PeakMem << " ";
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} else
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OS << " ";
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}
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OS << Name << "\n";
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Started = false; // Once printed, don't print again
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if (&Total < this) {
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Total.Lock.release();
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Lock.release();
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} else {
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Lock.release();
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Total.Lock.release();
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}
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}
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// GetLibSupportInfoOutputFile - Return a file stream to print our output on...
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std::ostream *
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llvm::GetLibSupportInfoOutputFile() {
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std::string &LibSupportInfoOutputFilename = getLibSupportInfoOutputFilename();
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if (LibSupportInfoOutputFilename.empty())
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return cerr.stream();
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if (LibSupportInfoOutputFilename == "-")
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return cout.stream();
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std::ostream *Result = new std::ofstream(LibSupportInfoOutputFilename.c_str(),
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std::ios::app);
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if (!Result->good()) {
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cerr << "Error opening info-output-file '"
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<< LibSupportInfoOutputFilename << " for appending!\n";
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delete Result;
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return cerr.stream();
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}
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return Result;
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}
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void TimerGroup::removeTimer() {
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sys::SmartScopedLock<true> L(&*TimerLock);
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if (--NumTimers == 0 && !TimersToPrint.empty()) { // Print timing report...
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// Sort the timers in descending order by amount of time taken...
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std::sort(TimersToPrint.begin(), TimersToPrint.end(),
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std::greater<Timer>());
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// Figure out how many spaces to indent TimerGroup name...
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unsigned Padding = (80-Name.length())/2;
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if (Padding > 80) Padding = 0; // Don't allow "negative" numbers
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std::ostream *OutStream = GetLibSupportInfoOutputFile();
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++NumTimers;
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{ // Scope to contain Total timer... don't allow total timer to drop us to
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// zero timers...
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Timer Total("TOTAL");
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for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
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Total.sum(TimersToPrint[i]);
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// Print out timing header...
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*OutStream << "===" << std::string(73, '-') << "===\n"
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<< std::string(Padding, ' ') << Name << "\n"
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<< "===" << std::string(73, '-')
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<< "===\n";
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// If this is not an collection of ungrouped times, print the total time.
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// Ungrouped timers don't really make sense to add up. We still print the
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// TOTAL line to make the percentages make sense.
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if (this != DefaultTimerGroup) {
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*OutStream << " Total Execution Time: ";
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printAlignedFP(Total.getProcessTime(), 4, 5, *OutStream);
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*OutStream << " seconds (";
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printAlignedFP(Total.getWallTime(), 4, 5, *OutStream);
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*OutStream << " wall clock)\n";
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}
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*OutStream << "\n";
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if (Total.UserTime)
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*OutStream << " ---User Time---";
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if (Total.SystemTime)
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*OutStream << " --System Time--";
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if (Total.getProcessTime())
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*OutStream << " --User+System--";
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*OutStream << " ---Wall Time---";
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if (Total.getMemUsed())
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*OutStream << " ---Mem---";
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if (Total.getPeakMem())
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*OutStream << " -PeakMem-";
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*OutStream << " --- Name ---\n";
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// Loop through all of the timing data, printing it out...
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for (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
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TimersToPrint[i].print(Total, *OutStream);
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Total.print(Total, *OutStream);
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*OutStream << std::endl; // Flush output
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}
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--NumTimers;
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TimersToPrint.clear();
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if (OutStream != cerr.stream() && OutStream != cout.stream())
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delete OutStream; // Close the file...
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}
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}
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void TimerGroup::addTimer() {
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sys::SmartScopedLock<true> L(&*TimerLock);
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++NumTimers;
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}
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void TimerGroup::addTimerToPrint(const Timer &T) {
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sys::SmartScopedLock<true> L(&*TimerLock);
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TimersToPrint.push_back(Timer(true, T));
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}
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