Kaskade::TaskTiming Class Reference

A class that gathers data on task timing and provides gnuplot visualization. More...

#include <timing.hh>

Detailed Description

A class that gathers data on task timing and provides gnuplot visualization.

This is particularly useful as a performance investigation tool in multithreaded computations, where one can investigate which task is performed during which time interval.

Template Parameters

n	the maximal number of segments for each task

Example usage:

TaskTiming tt(2);
start(0); doSomeWork(); stop(0);
start(1); doSomeOtherWork(); stop(1);
std::ofstream timings("timings.gnu"); timings << tt; 

For visualization in form of horizontal task durations in second scale, use gnuplot as

plot "timings.gnu" with linepoints

Definition at line 290 of file timing.hh.

Public Member Functions
	TaskTiming (int nTasks, int m=1)
	Constructor. More...
void	start (int task)
	defines the start of given task. More...
void	stop (int task)
	defines the start of given task. More...

Friends
std::ostream &	operator<< (std::ostream &out, TaskTiming const &tt)

Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &out, TaskTiming const &tt)
	output of task timing to gnuplot file More...

Constructor & Destructor Documentation

TaskTiming()

Kaskade::TaskTiming::TaskTiming	(	int	nTasks,
		int	m = 1
	)

Constructor.

Parameters

nTasks	number of tasks to measure. Has to be nonnegative.
m	maximal number of segments per task to measure. Has to be nonnegative.

Member Function Documentation

start()

void Kaskade::TaskTiming::start

(

int

task

)

defines the start of given task.

Parameters

task	the task number in [0,nTasks[ If called multiple times for a task, only the last call counts.

Referenced by Kaskade::parallelFor(), and Kaskade::PatchDomainDecompositionPreconditioner< Space, m, StorageTag, SparseMatrixIndex >::PatchDomainDecompositionPreconditioner().

stop()

void Kaskade::TaskTiming::stop

(

int

task

)

defines the start of given task.

Parameters

task	the task number in [0,nTasks[ If called multiple times for a task, only the last call counts.

Referenced by Kaskade::parallelFor(), and Kaskade::PatchDomainDecompositionPreconditioner< Space, m, StorageTag, SparseMatrixIndex >::PatchDomainDecompositionPreconditioner().

Friends And Related Function Documentation

operator<< [1/2]

std::ostream & operator<< ( std::ostream &  out, TaskTiming const &  tt  )

friend

operator<<() [2/2]

std::ostream & operator<< ( std::ostream &  out, TaskTiming const &  tt  )

related

output of task timing to gnuplot file

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The documentation for this class was generated from the following file:

• timing.hh