/usr/include/libmesh/perf_log.h is in libmesh-dev 0.7.1-2ubuntu1.
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// The libMesh Finite Element Library.
// Copyright (C) 2002-2008 Benjamin S. Kirk, John W. Peterson, Roy H. Stogner
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#ifndef __perflog_h__
#define __perflog_h__
// Local includes
#include "libmesh_common.h"
#include "o_string_stream.h"
// C++ includes
#include <string>
#include <stack>
#include <map>
#include <sys/time.h>
namespace libMesh
{
// Forward Declarations
// class OStringStream;
/**
* The \p PerfData class simply contains the performance
* data that is recorded for individual events.
*/
// ------------------------------------------------------------
// PerfData class definition
class PerfData
{
public:
/**
* Constructor. Initializes data to be empty.
*/
PerfData () :
tot_time(0.),
tot_time_incl_sub(0.),
tstart(),
tstart_incl_sub(),
count(0),
open(false),
called_recursively(0)
{}
/**
* Total time spent in this event.
*/
double tot_time;
/**
* Total time spent in this event, including sub-events.
*/
double tot_time_incl_sub;
/**
* Structure defining when the event
* was last started.
*/
struct timeval tstart;
/**
* Structure defining when the event
* was last started, including sub-events.
*/
struct timeval tstart_incl_sub;
/**
* The number of times this event has
* been executed
*/
unsigned int count;
/**
* Flag indicating if we are currently
* monitoring this event. Should only
* be true while the event is executing.
*/
bool open;
void start ();
void restart ();
double pause ();
double stopit ();
int called_recursively;
protected:
double stop_or_pause(const bool do_stop);
};
/**
* The \p PerfLog class allows monitoring of specific events.
* An event is defined by a unique string that functions as
* a label. Each time the event is executed data are recorded.
* This class is particulary useful for finding performance
* bottlenecks.
*
*/
// ------------------------------------------------------------
// PerfLog class definition
class PerfLog
{
public:
/**
* Constructor. \p label_name is the name of the object, which
* will bw print in the log to distinguish it from other objects.
* \p log_events is a flag to optionally
* disable logging. You can use this flag to turn off
* logging without touching any other code.
*/
PerfLog(const std::string& label_name="",
const bool log_events=true);
/**
* Destructor. Calls \p clear() and \p print_log().
*/
~PerfLog();
/**
* Clears all the internal data and returns the
* data structures to a pristine state. This function
* checks to see if it is currently monitoring any
* events, and if so errors. Be sure you are not
* logging any events when you call this function.
*/
void clear();
/**
* Disables performance logging for an active object.
*/
void disable_logging() { log_events = false; }
/**
* Enables performance logging for an active object.
*/
void enable_logging() { log_events = true; }
/**
* Push the event \p label onto the stack, pausing any active event.
*/
void push (const std::string &label,
const std::string &header="");
/**
* Pop the event \p label off the stack, resuming any lower event.
*/
void pop (const std::string &label,
const std::string &header="");
/**
* Start monitoring the event named \p label.
*/
void start_event(const std::string &label,
const std::string &header="");
/**
* Stop monitoring the event named \p label.
*/
void stop_event(const std::string &label,
const std::string &header="");
/**
* Suspend monitoring of the event.
*/
void pause_event(const std::string &label,
const std::string &header="");
/**
* Restart monitoring the event.
*/
void restart_event(const std::string &label,
const std::string &header="");
/**
* @returns a string containing:
* (1) Basic machine information (if first call)
* (2) The performance log
*/
std::string get_log() const;
/**
* @returns a string containing ONLY the information header.
*/
std::string get_info_header() const;
/**
* @returns a string containing ONLY the log information
*/
std::string get_perf_info() const;
/**
* Print the log.
*/
void print_log() const;
/**
* @returns the total time spent on this event.
*/
double get_elapsed_time() const;
private:
/**
* The label for this object.
*/
const std::string label_name;
/**
* Flag to optionally disable all logging.
*/
bool log_events;
/**
* The total running time for recorded events.
*/
double total_time;
/**
* The time we were constructed or last cleared.
*/
struct timeval tstart;
/**
* The actual log.
*/
std::map<std::pair<std::string,
std::string>,
PerfData> log;
/**
* A stack to hold the current performance log trace.
*/
std::stack<PerfData*> log_stack;
/**
* Flag indicating if print_log() has been called.
* This is used to print a header with machine-specific
* data the first time that print_log() is called.
*/
static bool called;
/**
* Prints a line of 'n' repeated characters 'c'
* to the output string stream "out".
*/
void _character_line(const unsigned int n,
const char c,
OStringStream& out) const;
};
// ------------------------------------------------------------
// PerfData class member funcions
inline
void PerfData::start ()
{
this->count++;
this->called_recursively++;
gettimeofday (&(this->tstart), NULL);
this->tstart_incl_sub = this->tstart;
}
inline
void PerfData::restart ()
{
gettimeofday (&(this->tstart), NULL);
}
inline
double PerfData::pause ()
{
return this->stop_or_pause(false);
}
inline
double PerfData::stop_or_pause(const bool do_stop)
{
// save the start times, reuse the structure we have rather than create
// a new one.
const time_t
tstart_tv_sec = this->tstart.tv_sec,
tstart_tv_usec = this->tstart.tv_usec;
gettimeofday (&(this->tstart), NULL);
const double elapsed_time = (static_cast<double>(this->tstart.tv_sec - tstart_tv_sec) +
static_cast<double>(this->tstart.tv_usec - tstart_tv_usec)*1.e-6);
this->tot_time += elapsed_time;
if(do_stop)
{
const double elapsed_time_incl_sub = (static_cast<double>(this->tstart.tv_sec - this->tstart_incl_sub.tv_sec) +
static_cast<double>(this->tstart.tv_usec - this->tstart_incl_sub.tv_usec)*1.e-6);
this->tot_time_incl_sub += elapsed_time_incl_sub;
}
return elapsed_time;
}
inline
double PerfData::stopit ()
{
// stopit is just similar to pause except that it decrements the
// recursive call counter
this->called_recursively--;
return this->stop_or_pause(true);
}
// ------------------------------------------------------------
// PerfLog class inline member funcions
inline
void PerfLog::push (const std::string &label,
const std::string &header)
{
if (this->log_events)
{
// Get a reference to the event data to avoid
// repeated map lookups
PerfData *perf_data = &(log[std::make_pair(header,label)]);
if (!log_stack.empty())
total_time +=
log_stack.top()->pause();
perf_data->start();
log_stack.push(perf_data);
}
}
inline
void PerfLog::pop (const std::string &label,
const std::string &header)
{
if (this->log_events)
{
libmesh_assert (!log_stack.empty());
#ifndef NDEBUG
PerfData *perf_data = &(log[std::make_pair(header,label)]);
if (perf_data != log_stack.top())
{
std::cerr << "PerfLog can't pop (" << header << ',' << label << ')' << std::endl;
std::cerr << "From top of stack of running logs:" << std::endl;
std::map<std::pair<std::string, std::string>, PerfData>::iterator
i = log.begin(), endi = log.end();
for (; i != endi; ++i)
if (&(i->second) == log_stack.top())
std::cerr << '(' << i->first.first << ',' << i->first.second << ')' << std::endl;
libmesh_assert(perf_data == log_stack.top());
}
#endif
total_time += log_stack.top()->stopit();
log_stack.pop();
if (!log_stack.empty())
log_stack.top()->restart();
}
}
inline
double PerfLog::get_elapsed_time () const
{
struct timeval tnow;
gettimeofday (&tnow, NULL);
const double elapsed_time = (static_cast<double>(tnow.tv_sec - tstart.tv_sec) +
static_cast<double>(tnow.tv_usec - tstart.tv_usec)*1.e-6);
return elapsed_time;
}
} // namespace libMesh
#endif
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