sys_profiler.hh File Reference

#include "global_defs.h"
#include <mpi.h>
#include <ostream>
#include <boost/functional/hash/hash.hpp>
#include <boost/ref.hpp>
#include <boost/tuple/detail/tuple_basic.hpp>
#include <boost/unordered/unordered_map.hpp>
#include <nlohmann/json.hpp>
#include "time_point.hh"
#include "petscsys.h"
#include "simple_allocator.hh"

Go to the source code of this file.

Classes
struct	boost::hash< T >
class	MPI_Functions
class	Profiler

Namespaces
	boost

Macros
#define	CONSTEXPR_   constexpr
#define	_PASTE(a, b)   a ## b
#define	PASTE(a, b)   _PASTE(a, b)
#define	START_TIMER(tag)
	Starts a timer with specified tag. More...
#define	START_TIMER_EXT(tag, subtag)
	Starts a timer with specified tag and subtag. More...
#define	END_TIMER(tag)
	Ends a timer with specified tag. More...
#define	END_START_TIMER(tag)
#define	ADD_CALLS(n_calls)
	Increase number of calls in actual timer. More...

Detailed Description

 * Copyright (C) 2015 Technical University of Liberec. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License version 3 as published by the Free Software Foundation. (http://www.gnu.org/licenses/gpl-3.0.en.html)

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.

Todo:

• START_GLOBAL_TIMER(tag) - this calls the start_timer, which creates local timer on the correct place in the hierarchy, further this timer is added to the list of global timers, this contains groups of timers with same tag, and collect/sum data from these timers in the report.

• Allow output even during calculation (not complete, but at least some thing) Report should contain time of start as well as time of creation of the report or time from start of the program.
• When generating report we has to deal with possibly different trees at every MPI process.
• test memory profiling in our own new and xmalloc functions - register allocatied and deallocated memory to active Profiler frame.
• test in parallel
• extended output: cas na jedno volani (jina redukce nez pro kumulativni cas, pokud je pocet volani ruzny) procenta vuci predkovi code point (az nekde na konci radky)

!!! Unfortunately using constexpr is worse (without optimization).
This is probably due to use of static variable for
CodePoint, the access could be slow, and computation of hash is done only once. Actually timing results
are:

OPTIONS     OVERHEAD (compared to call 2x clock())
-g, no c++11 : 18%
-g,    c++11 : 60%
-O3,no c++11 : 6%
-O3,   c++11 : 6%

Definition in file sys_profiler.hh.

Macro Definition Documentation

#define _PASTE	(		a,
			b
	)		a ## b

Definition at line 90 of file sys_profiler.hh.

#define ADD_CALLS

(

n_calls

)

Increase number of calls in actual timer.

Some time you want to measure a performance of a cycle with body that is below resolution of the Timer implementation. If you know number of cycles, you can use this macro in following way:

START_TIMER("cycle");
unsigned int i;
for(i =0; i<1000000; i++) i*i*i;
ADD_CALLS(i);
END_TIMER("cycle");

In the profiler report you get the total time spent in the cycle, and time per one call which will be average time spent in the body of the cycle.

Definition at line 184 of file sys_profiler.hh.

#define CONSTEXPR_   constexpr

Definition at line 84 of file sys_profiler.hh.

#define END_START_TIMER

(

tag

)

Ends current timer and starts the new one with given tag. Again this expands into two lines, see ATTENTION in previous macro.

Definition at line 158 of file sys_profiler.hh.

#define END_TIMER

(

tag

)

Ends a timer with specified tag.

Use only if you want to end timer before the end of block. Again this expands into two lines, see ATTENTION in previous macro.

Definition at line 147 of file sys_profiler.hh.

#define PASTE	(		a,
			b
	)		_PASTE(a, b)

Definition at line 91 of file sys_profiler.hh.

#define START_TIMER

(

tag

)

Starts a timer with specified tag.

In fact it creates an static constant expression that identifies the point in the code and contains tag of the involved timer and its hash. Then it creates local variable that calls Profiler::start_timer() in constructor and Profiler::stop_timer() in destructor. This way the timer is automatically closed at the end of current block.

ATTENTION: This macro expands to two statements so following code is illegal:

if (some_condition) START_TIMER(tag);

Definition at line 113 of file sys_profiler.hh.

#define START_TIMER_EXT	(		tag,
			subtag
	)

Starts a timer with specified tag and subtag.

In fact it creates an static constant expression that identifies the point in the code and contains tag and subtag of the involved timer and its hash. Then it creates local variable that calls Profiler::start_timer() in constructor and Profiler::stop_timer() in destructor. This way the timer is automatically closed at the end of current block.

ATTENTION: This macro expands to two statements so following code is illegal:

if (some_condition) START_TIMER_EXT(tag, subtag);

Definition at line 134 of file sys_profiler.hh.