impala::StopWatch Class Reference

#include <stopwatch.h>

Collaboration diagram for impala::StopWatch:

Public Member Functions
	StopWatch ()
void	Start ()
void	Stop ()
uint64_t	ElapsedTime () const
	Returns time in cpu ticks. More...

Static Public Member Functions
static uint64_t	Rdtsc ()

Private Attributes
uint64_t	start_
uint64_t	total_time_
bool	running_

Detailed Description

Utility class to measure time. This is measured using the cpu tick counter which is very low overhead but can be inaccurate if the thread is switched away. This is useful for measuring cpu time at the row batch level (too much overhead at the row granularity).

Definition at line 28 of file stopwatch.h.

Constructor & Destructor Documentation

impala::StopWatch::StopWatch ( )

inline

Definition at line 30 of file stopwatch.h.

References running_, and total_time_.

Member Function Documentation

uint64_t impala::StopWatch::ElapsedTime ( ) const

inline

Returns time in cpu ticks.

Definition at line 50 of file stopwatch.h.

References Rdtsc(), running_, start_, and total_time_.

Referenced by impala::GrowingTest::AggregateTest(), main(), impala::Benchmark::Measure(), Test(), and TimeParallelExecutors().

static uint64_t impala::StopWatch::Rdtsc ( )

inlinestatic

Definition at line 54 of file stopwatch.h.

Referenced by ElapsedTime(), Start(), and Stop().

void impala::StopWatch::Start ( )

inline

Definition at line 35 of file stopwatch.h.

References Rdtsc(), running_, and start_.

Referenced by impala::GrowingTest::AggregateTest(), main(), impala::Benchmark::Measure(), Test(), impala::PartitioningThroughputTest::TestRawThroughput(), impala::PartitioningThroughputTest::TestThroughput(), and TimeParallelExecutors().

void impala::StopWatch::Stop ( )

inline

Definition at line 42 of file stopwatch.h.

References Rdtsc(), running_, start_, and total_time_.

Referenced by impala::GrowingTest::AggregateTest(), main(), impala::Benchmark::Measure(), Test(), impala::PartitioningThroughputTest::TestRawThroughput(), impala::PartitioningThroughputTest::TestThroughput(), and TimeParallelExecutors().

Member Data Documentation

bool impala::StopWatch::running_

private

Definition at line 65 of file stopwatch.h.

Referenced by ElapsedTime(), Start(), Stop(), and StopWatch().

uint64_t impala::StopWatch::start_

private

Definition at line 64 of file stopwatch.h.

Referenced by ElapsedTime(), Start(), and Stop().

uint64_t impala::StopWatch::total_time_

private

Definition at line 64 of file stopwatch.h.

Referenced by ElapsedTime(), Stop(), and StopWatch().

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

• be/src/util/stopwatch.h