MueLu_MutuallyExclusiveTime.cpp

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#include <map>
#include <iostream>                     // for basic_ostream, etc
#include <utility>                      // for pair
#include "Teuchos_FancyOStream.hpp"     // for basic_FancyOStream, etc
#include "Teuchos_RCP.hpp"              // for RCP::operator->, etc
#include "Teuchos_TestForException.hpp"  // for TEUCHOS_TEST_FOR_EXCEPTION
#include "Teuchos_Time.hpp"
#include "Teuchos_TimeMonitor.hpp"
#include "MueLu_ConfigDefs.hpp"
#include "MueLu_Exceptions.hpp"
#include "MueLu_BaseClass.hpp"
#include "MueLu_VerbosityLevel.hpp"     // for MsgType::Debug, etc
#include "MueLu_MutuallyExclusiveTime.hpp"
#include "MueLu_FactoryBase.hpp"
#include "MueLu_Level.hpp"

namespace MueLu {

  std::map<std::string,std::string> myParent_;

  template <class TagName>
  MutuallyExclusiveTime<TagName>::MutuallyExclusiveTime(const std::string &name, bool startFlag)
    : name_(name),
      timer_(rcp(new Teuchos::Time(name, false))),  // second argument is false in any case, because if start==true,
                                                    // timer has to be started by MutuallyExclusiveTime::start() instead of Teuchos::Time::start().
      isPaused_(false)
  {
    if (startFlag == true) timer_->start();
  }

  template <class TagName>
  MutuallyExclusiveTime<TagName>::~MutuallyExclusiveTime() {
    // This timer can only be destroyed if it is not in the stack
    if (isPaused()) {
      // error message because cannot throw an exception in destructor
      GetOStream(Errors) << "MutuallyExclusiveTime::~MutuallyExclusiveTime(): Error: destructor called on a paused timer." << std::endl;
      //TODO: Even if timing results will be wrong, the timer can be removed from the stack to avoid a segmentation fault.
    }

    stop(); // if isRunning(), remove from the stack, resume previous timer
  }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::start(bool reset) {
    TEUCHOS_TEST_FOR_EXCEPTION(isPaused(), Exceptions::RuntimeError, "MueLu::MutuallyExclusiveTime::start(): timer is paused. Use resume().");

    if (isRunning()) { return; } // If timer is already running, do not pause/push-in-the-stack/start the timer.
                                 // Otherwise, something bad will happen when this.stop() will be called

    // pause currently running timer
    if (!timerStack_.empty()) {
      GetOStream(Debug) << "pausing parent timer " << timerStack_.top()->name_ << std::endl;
      timerStack_.top()->pause();
      GetOStream(Debug) << "starting child timer " << this->name_ << std::endl;
      myParent_[this->name_] = timerStack_.top()->name_;
    } else {
      GetOStream(Debug) << "starting orphan timer " << this->name_ << std::endl;
      myParent_[this->name_] = "no parent";
    }

    // start this timer
    timer_->start(reset);
    timerStack_.push(this);
  }

  template <class TagName>
  double MutuallyExclusiveTime<TagName>::stop() {
    if(isPaused())
      GetOStream(Errors) << "MueLu::MutuallyExclusiveTime::stop(): timer is paused. Use resume()" << std::endl;

    if (!isRunning()) { return timer_->stop(); } // stop() can be called on stopped timer

    // Here, timer is running, so it is the head of the stack
    TopOfTheStack();

    timerStack_.pop();
    double r = timer_->stop();

    if (!timerStack_.empty()) {
          GetOStream(Debug) << "resuming timer " << timerStack_.top()->name_ << std::endl;
          timerStack_.top()->resume();
    }

    return r;
  }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::pause() {
    if (isPaused()) // calling twice pause() is allowed
      return;

    TopOfTheStack();

    timer_->stop();
    isPaused_ = true;
  }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::resume() {
    TopOfTheStack();

    // no 'shortcut' test necessary:
    // - if timer is stop, it is in pause (cannot be stop and not in pause because this timer is the head of the stack).
    // - if timer is running, nothing is changed by this function.

    timer_->start(false);
    isPaused_ = false;
  }

  template <class TagName>
  bool MutuallyExclusiveTime<TagName>::isRunning() {
    if (timer_->isRunning()) {
             // TEUCHOS_TEST_FOR_EXCEPTION(timerStack_.top() != this, Exceptions::RuntimeError,
             //            "MueLu::MutuallyExclusiveTime::isRunning(): this timer is active so it is supposed to be the head of the stack");
    }
    return timer_->isRunning();
  }

  template <class TagName>
  bool MutuallyExclusiveTime<TagName>::isPaused() {
    TEUCHOS_TEST_FOR_EXCEPTION(isPaused_ && timer_->isRunning(), Exceptions::RuntimeError, "");
    return isPaused_;
  }

  template <class TagName>
  RCP<MutuallyExclusiveTime<TagName> > MutuallyExclusiveTime<TagName>::getNewTimer(const std::string& name) {
    RCP<MutuallyExclusiveTime<TagName> > timer = rcp(new MutuallyExclusiveTime<TagName>(Teuchos::TimeMonitor::getNewTimer(name)));
    timer->name_ = name;
    return timer;
  }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::incrementNumCalls() { timer_->incrementNumCalls(); }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::PrintParentChildPairs() {
    //key is child, value is parent
    RCP<Teuchos::FancyOStream> fos = Teuchos::fancyOStream(Teuchos::rcpFromRef(std::cout)); fos->setOutputToRootOnly(0);
    *fos << "Parent Child Map" << std::endl;
    std::map<std::string, std::string >::const_iterator iter;
    for (iter = ::MueLu::myParent_.begin(); iter != ::MueLu::myParent_.end(); ++iter) {
      *fos << "Key: " << iter->first << "  Value: " << iter->second << std::endl;
    }
  }

  template <class TagName>
  MutuallyExclusiveTime<TagName>::MutuallyExclusiveTime(RCP<Teuchos::Time> timer)
    : timer_(timer), isPaused_(false)
  { }

  template <class TagName>
  void MutuallyExclusiveTime<TagName>::TopOfTheStack() {
    TEUCHOS_TEST_FOR_EXCEPTION(timerStack_.empty(), Exceptions::RuntimeError, "MueLu::MutuallyExclusiveTime::TopOfTheStack(): timer is not the head of the stack (stack is empty).");
    // TEUCHOS_TEST_FOR_EXCEPTION(timerStack_.top() != this, Exceptions::RuntimeError,  "MueLu::MutuallyExclusiveTime::TopOfTheStack(): timer is not the head of the stack.");
    TEUCHOS_TEST_FOR_EXCEPTION(!(isRunning() || isPaused()), Exceptions::RuntimeError,  "MueLu::MutuallyExclusiveTime::TopOfTheStack(): head of the stack timer is neither active nor paused.");
  }

  template <class TagName>
  std::stack<MutuallyExclusiveTime<TagName>*> MutuallyExclusiveTime<TagName>::timerStack_;

  //FIXME: move this:
  template class MutuallyExclusiveTime<FactoryBase>;
  template class MutuallyExclusiveTime<Level>;
  template class MutuallyExclusiveTime<BaseClass>;

} // namespace MueLu