llvm-6502/lib/Support/Timer.cpp
2010-05-19 01:21:34 +00:00

392 lines
12 KiB
C++

//===-- 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.
//
//===----------------------------------------------------------------------===//
//
// Interval Timing implementation.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Timer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Format.h"
#include "llvm/System/Mutex.h"
#include "llvm/System/Process.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/StringMap.h"
using namespace llvm;
// CreateInfoOutputFile - Return a file stream to print our output on.
namespace llvm { extern raw_ostream *CreateInfoOutputFile(); }
// getLibSupportInfoOutputFilename - 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()));
}
// CreateInfoOutputFile - Return a file stream to print our output on.
raw_ostream *llvm::CreateInfoOutputFile() {
const std::string &OutputFilename = getLibSupportInfoOutputFilename();
if (OutputFilename.empty())
return new raw_fd_ostream(2, false); // stderr.
if (OutputFilename == "-")
return new 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::string Error;
raw_ostream *Result = new raw_fd_ostream(OutputFilename.c_str(),
Error, raw_fd_ostream::F_Append);
if (Error.empty())
return Result;
errs() << "Error opening info-output-file '"
<< OutputFilename << " for appending!\n";
delete Result;
return new raw_fd_ostream(2, false); // stderr.
}
static TimerGroup *DefaultTimerGroup = 0;
static TimerGroup *getDefaultTimerGroup() {
TimerGroup *tmp = DefaultTimerGroup;
sys::MemoryFence();
if (tmp) return tmp;
llvm_acquire_global_lock();
tmp = DefaultTimerGroup;
if (!tmp) {
tmp = new TimerGroup("Miscellaneous Ungrouped Timers");
sys::MemoryFence();
DefaultTimerGroup = tmp;
}
llvm_release_global_lock();
return tmp;
}
//===----------------------------------------------------------------------===//
// Timer Implementation
//===----------------------------------------------------------------------===//
void Timer::init(StringRef N) {
assert(TG == 0 && "Timer already initialized");
Name.assign(N.begin(), N.end());
Started = false;
TG = getDefaultTimerGroup();
TG->addTimer(*this);
}
void Timer::init(StringRef N, TimerGroup &tg) {
assert(TG == 0 && "Timer already initialized");
Name.assign(N.begin(), N.end());
Started = 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) {
TimeRecord Result;
sys::TimeValue now(0,0), user(0,0), sys(0,0);
if (Start) {
Result.MemUsed = getMemUsage();
sys::Process::GetTimeUsage(now, user, sys);
} else {
sys::Process::GetTimeUsage(now, user, sys);
Result.MemUsed = getMemUsage();
}
Result.WallTime = now.seconds() + now.microseconds() / 1000000.0;
Result.UserTime = user.seconds() + user.microseconds() / 1000000.0;
Result.SystemTime = sys.seconds() + sys.microseconds() / 1000000.0;
return Result;
}
static ManagedStatic<std::vector<Timer*> > ActiveTimers;
void Timer::startTimer() {
Started = true;
ActiveTimers->push_back(this);
Time -= TimeRecord::getCurrentTime(true);
}
void Timer::stopTimer() {
Time += TimeRecord::getCurrentTime(false);
if (ActiveTimers->back() == this) {
ActiveTimers->pop_back();
} else {
std::vector<Timer*>::iterator I =
std::find(ActiveTimers->begin(), ActiveTimers->end(), this);
assert(I != ActiveTimers->end() && "stop but no startTimer?");
ActiveTimers->erase(I);
}
}
static void printVal(double Val, double Total, raw_ostream &OS) {
if (Total < 1e-7) // Avoid dividing by zero.
OS << " ----- ";
else {
OS << " " << format("%7.4f", Val) << " (";
OS << format("%5.1f", 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("%9lld", (long long)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 GroupName) {
sys::SmartScopedLock<true> L(*TimerLock);
std::pair<TimerGroup*, Name2TimerMap> &GroupEntry = Map[GroupName];
if (!GroupEntry.first)
GroupEntry.first = new TimerGroup(GroupName);
Timer &T = GroupEntry.second[Name];
if (!T.isInitialized())
T.init(Name, *GroupEntry.first);
return T;
}
};
}
static ManagedStatic<Name2TimerMap> NamedTimers;
static ManagedStatic<Name2PairMap> NamedGroupedTimers;
static Timer &getNamedRegionTimer(StringRef Name) {
sys::SmartScopedLock<true> L(*TimerLock);
Timer &T = (*NamedTimers)[Name];
if (!T.isInitialized())
T.init(Name);
return T;
}
NamedRegionTimer::NamedRegionTimer(StringRef Name)
: TimeRegion(getNamedRegionTimer(Name)) {}
NamedRegionTimer::NamedRegionTimer(StringRef Name, StringRef GroupName)
: TimeRegion(NamedGroupedTimers->get(Name, GroupName)) {}
//===----------------------------------------------------------------------===//
// TimerGroup Implementation
//===----------------------------------------------------------------------===//
/// TimerGroupList - This is the global list of TimerGroups, maintained by the
/// TimerGroup ctor/dtor and is protected by the TimerLock lock.
static TimerGroup *TimerGroupList = 0;
TimerGroup::TimerGroup(StringRef name)
: Name(name.begin(), name.end()), FirstTimer(0) {
// 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 != 0)
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.Started)
TimersToPrint.push_back(std::make_pair(T.Time, T.Name));
T.TG = 0;
// 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 != 0 || TimersToPrint.empty())
return;
raw_ostream *OutStream = CreateInfoOutputFile();
PrintQueuedTimers(*OutStream);
delete OutStream; // Close the file.
}
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 (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i)
Total += TimersToPrint[i].first;
// Print out timing header.
OS << "===" << std::string(73, '-') << "===\n";
// Figure out how many spaces to indent TimerGroup name.
unsigned Padding = (80-Name.length())/2;
if (Padding > 80) Padding = 0; // Don't allow "negative" numbers
OS.indent(Padding) << Name << '\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 << " Total Execution Time: ";
OS << format("%5.4f", Total.getProcessTime()) << " seconds (";
OS << format("%5.4f", Total.getWallTime()) << " wall clock)\n";
}
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 (unsigned i = 0, e = TimersToPrint.size(); i != e; ++i) {
const std::pair<TimeRecord, std::string> &Entry = TimersToPrint[e-i-1];
Entry.first.print(Total, OS);
OS << Entry.second << '\n';
}
Total.print(Total, OS);
OS << "Total\n\n";
OS.flush();
TimersToPrint.clear();
}
/// print - Print any started timers in this group and zero them.
void TimerGroup::print(raw_ostream &OS) {
sys::SmartScopedLock<true> L(*TimerLock);
// 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->Started) continue;
TimersToPrint.push_back(std::make_pair(T->Time, T->Name));
// Clear out the time.
T->Started = 0;
T->Time = TimeRecord();
}
// If any timers were started, print the group.
if (!TimersToPrint.empty())
PrintQueuedTimers(OS);
}
/// printAll - This static method prints all timers and clears them all out.
void TimerGroup::printAll(raw_ostream &OS) {
sys::SmartScopedLock<true> L(*TimerLock);
for (TimerGroup *TG = TimerGroupList; TG; TG = TG->Next)
TG->print(OS);
}