net_instaweb::SharedMemHistogram Class Reference

Inheritance diagram for net_instaweb::SharedMemHistogram:

Public Member Functions
	SharedMemHistogram (StringPiece name, Statistics *stats)
virtual void	Add (double value)
	Record a value in its bucket.
virtual void	Clear ()
	Throw away all data.
virtual int	NumBuckets ()
	Returns number of buckets the histogram actually has.
virtual void	EnableNegativeBuckets ()
virtual void	SetMinValue (double value)
	Set the minimum value allowed in histogram.
virtual void	SetMaxValue (double value)
virtual void	SetSuggestedNumBuckets (int i)
size_t	AllocationSize (AbstractSharedMem *shm_runtime)
Public Member Functions inherited from net_instaweb::Histogram
bool	Empty ()
	True if the histogram is empty.
virtual void	Render (int index, Writer *writer, MessageHandler *handler)
double	Average ()
	Returns average of the values added.
double	Percentile (const double perc)
double	StandardDeviation ()
double	Count ()
double	Maximum ()
double	Minimum ()
double	Median ()
GoogleString	HtmlTableRow (const GoogleString &title, int index)
virtual double	BucketLimit (int index)
	Upper bound of a bucket.

Protected Member Functions
virtual AbstractMutex *	lock ()
virtual double	AverageInternal ()
	Note that these *Internal interfaces require the mutex to be held.
virtual double	PercentileInternal (const double perc)
virtual double	StandardDeviationInternal ()
virtual double	CountInternal ()
virtual double	MaximumInternal ()
virtual double	MinimumInternal ()
virtual double	BucketStart (int index)
virtual double	BucketCount (int index)
	Value of a bucket.
Protected Member Functions inherited from net_instaweb::Histogram
void	WriteRawHistogramData (Writer *writer, MessageHandler *handler)

Friends
class	SharedMemStatistics

Member Function Documentation

size_t net_instaweb::SharedMemHistogram::AllocationSize ( AbstractSharedMem *  shm_runtime )

inline

Return the amount of shared memory this Histogram objects needs for its use.

Shared memory space should include a mutex, HistogramBody and the storage for the actual buckets.

virtual double net_instaweb::SharedMemHistogram::BucketStart ( int  index )

protectedvirtual

Lower bound of a bucket. If index == NumBuckets() + 1, returns the upper bound of the histogram. DCHECK if index is in the range of [0, NumBuckets()+1].

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::EnableNegativeBuckets ( )

virtual

Call the following functions after statistics->Init and before add values. EnableNegativeBuckets, SetMinValue and SetMaxValue will cause resetting Histogram.

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::SetMaxValue ( double  value )

virtual

Set the upper-bound of value in histogram, The value range in histogram is [MinValue, MaxValue) or (-MaxValue, MaxValue) if negative buckets are enabled.

Implements net_instaweb::Histogram.

virtual void net_instaweb::SharedMemHistogram::SetSuggestedNumBuckets ( int  i )

virtual

We rely on NumBuckets to allocate a memory segment for the histogram, so this should be called right after AddHistogram() in the ::Initialize process. Similarly, all the bounds must be initialized at that point, to avoid clearing the histogram as new child processes attach to it.

Implements net_instaweb::Histogram.

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

• pagespeed/kernel/sharedmem/shared_mem_statistics.h