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//------------------------------------------------------------------------------
// Author: Andrey Kuznetsov
// Description: Profiler class.
// Copyright (c) 2015 EPAM Systems
//------------------------------------------------------------------------------
/*
This file is part of Nfstrace.
Nfstrace 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, version 2 of the License.
Nfstrace 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 Nfstrace. If not, see <http://www.gnu.org/licenses/>.
*/
//------------------------------------------------------------------------------
#ifndef PROFILER_H
#define PROFILER_H
//------------------------------------------------------------------------------
#include <functional>
#include <iostream>
#include <numeric>
#include <vector>
#include <sys/time.h>
//------------------------------------------------------------------------------
#ifdef PROFILING
#define PROF Profiler<__COUNTER__> p(__func__)
#else
#define PROF
#endif
//------------------------------------------------------------------------------
/*! \class Profiler class. Just for profiling, it is not production!
* \param id - identificator of profiler. For different functions we have to use different id
* How to use? You have to insert this class in the begining of only 1 function (callback?)
* ...
* void function() {
* Profiler<__COUNTER__> p(__func__);
* // or just
* PROF;
* ...
*/
template <int id>
class Profiler
{
const char* name = ""; //!< Name of function
const static size_t reservedBytes = 50 * 1000; //!< Reserved - calls count
struct timespec startTime; //!< Timestamp of start function
class Local
{
const char* name = "";
public:
std::vector<std::uint64_t> values;
Local(const char* name)
: name(name)
{
values.reserve(reservedBytes);
}
~Local()
{
std::uint64_t sum = std::accumulate(values.begin(), values.end(), 0, std::plus<std::uint64_t>());
std::cout << name << "(" << id << "): calls count=" << values.size() << ", avg time=" << sum / values.size() << " nanosecs" << std::endl;
}
};
public:
/*! Constructor
* \param name - name of function, which you are going to profile
*/
Profiler(const char* name)
: name(name)
{
clock_gettime(CLOCK_REALTIME, &startTime);
}
~Profiler()
{
struct timespec stopTime;
clock_gettime(CLOCK_REALTIME, &stopTime);
static Local local(name); // Time of vector initialization is not included into statistics
local.values.push_back(stopTime.tv_nsec - startTime.tv_nsec); // Assume, that time < 1 second!
}
};
//------------------------------------------------------------------------------
#endif // PROFILER_H
//------------------------------------------------------------------------------
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