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/*
Copyright (C) 2014 Tim Mayberry
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __libpbd_timing_h__
#define __libpbd_timing_h__
#include <glib.h>
#include <stdint.h>
#include <string>
#include <vector>
#include "pbd/libpbd_visibility.h"
namespace PBD {
LIBPBD_API bool get_min_max_avg_total (const std::vector<uint64_t>& values, uint64_t& min, uint64_t& max, uint64_t& avg, uint64_t& total);
LIBPBD_API std::string timing_summary (const std::vector<uint64_t>& values);
/**
* This class allows collecting timing data using two different
* techniques. The first is using start() and update() and then
* calling elapsed() to get the elapsed time. This is useful when
* you want to measure the elapsed time between two different
* execution points. e.g
*
* timing.start();
* do_stuff();
* timing.update();
* cerr << "do_stuff took: "
* << timing.elapsed()
* << "usecs" << endl;
*
* The other is timing intervals using start() and calling
* get_interval() periodically to measure the time intervals
* between the same execution point. The difference is necessary
* to get the most accurate timing information when timing
* intervals but I didn't feel it necessary to have two separate
* classes.
*/
class LIBPBD_API Timing
{
public:
Timing ()
: m_start_val(0)
, m_last_val(0)
{ start ();}
bool valid () const {
return (m_start_val != 0 && m_last_val != 0);
}
void start () {
m_start_val = g_get_monotonic_time ();
m_last_val = 0;
}
void update () {
m_last_val = g_get_monotonic_time ();
}
void reset () {
m_start_val = m_last_val = 0;
}
uint64_t get_interval () {
uint64_t elapsed = 0;
update ();
if (valid()) {
elapsed = m_last_val - m_start_val;
m_start_val = m_last_val;
m_last_val = 0;
}
return elapsed;
}
/// @return Elapsed time in microseconds
uint64_t elapsed () const {
return m_last_val - m_start_val;
}
/// @return Elapsed time in milliseconds
uint64_t elapsed_msecs () const {
return elapsed () / 1000;
}
private:
uint64_t m_start_val;
uint64_t m_last_val;
};
class LIBPBD_API TimingData
{
public:
TimingData () : m_reserve_size(256)
{ reset (); }
void start_timing () {
m_timing.start ();
}
void add_elapsed () {
m_timing.update ();
if (m_timing.valid()) {
m_elapsed_values.push_back (m_timing.elapsed());
}
}
void add_interval () {
uint64_t interval = m_timing.get_interval ();
m_elapsed_values.push_back (interval);
}
void reset () {
m_elapsed_values.clear ();
m_elapsed_values.reserve (m_reserve_size);
}
std::string summary () const
{ return timing_summary (m_elapsed_values); }
bool get_min_max_avg_total (uint64_t& min,
uint64_t& max,
uint64_t& avg,
uint64_t& total) const
{ return PBD::get_min_max_avg_total (m_elapsed_values, min, max, avg, total); }
void reserve (uint32_t reserve_size)
{ m_reserve_size = reserve_size; reset (); }
uint32_t size () const
{ return m_elapsed_values.size(); }
private:
Timing m_timing;
uint32_t m_reserve_size;
std::vector<uint64_t> m_elapsed_values;
};
class LIBPBD_API Timed
{
public:
Timed (TimingData& data)
: m_data(data)
{
m_data.start_timing ();
}
~Timed ()
{
m_data.add_elapsed ();
}
private:
TimingData& m_data;
};
} // namespace PBD
#endif // __libpbd_timing_h__
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